Head Trauma (2024)

by Emranur Rahman & Mansoor Husain

You Have A New Patient!

A 22-year-old male with no significant medical history presented to the emergency department two hours after a motorbike accident. He had been riding at a moderate speed when he lost control of the bike and fell, striking his head on the pavement. He briefly lost consciousness and experienced a sharp headache immediately following the fall, along with mild dizziness, nausea, and vomiting. He denied any neurological deficits at the scene; however, by the time he arrived at the hospital, he reported the onset of right-sided weakness and numbness.

The image was produced by using ideogram 2.0.

Upon examination, the patient appeared anxious and in moderate distress due to the headache. His vital signs were stable, with a blood pressure of 130/85 mmHg, a heart rate of 88 bpm, and a respiratory rate of 18 breaths per minute.

What Do You Need To Know?

Importance

Appropriate head trauma management in the emergency department (ED) is crucial because head injuries can range from mild concussions to severe traumatic brain injuries (TBI) that may lead to permanent disability or death if not appropriately managed.

The importance of correct management in the ED includes early identification of life-threatening Injuries. Rapid assessment and intervention are essential to identify severe conditions such as intracranial hemorrhage, skull fractures, or brain contusions. It also helps in prevention of secondary brain injury. Secondary brain injury can result from hypoxia, hypotension, or elevated intracranial pressure (ICP), and can worsen the outcome of the initial trauma.

The survival and neurological outcome of patients suffering from TBI depend on the extent of the primary injury and the subsequent secondary injuries sustained [1].

Epidemiology

Head trauma is a significant global health issue, contributing to a high burden of morbidity, mortality, and long-term disability.

The most common causes of head injuries are motor vehicle collision (MVC), falls from a significant height, physical assault, and occupational injury [2].

TBI affects all age groups, but young adults (15-44 years) are particularly vulnerable, often due to motor vehicle accidents (MVAs) and violence. Males are disproportionately affected, with a male-to-female ratio of about 2:1, likely due to higher-risk behaviors and occupations. Gunshot wounds are the most lethal mechanism, with a mortality rate of approximately 90% [1].

Pathophysiology

The pathophysiology of brain injury is complex and multifaceted, involving both primary and secondary injury mechanisms. The primary injury occurs at the moment of impact and is characterized by mechanical damage to brain tissues, such as axonal shearing or bleeding internally, which is not amenable to acute intervention [3]. Secondary injury, however, involves a cascade of biochemical, molecular, and structural changes that unfold over time, leading to further neuronal damage and dysfunction [3,4]. These secondary processes include glutamatergic excitotoxicity, loss of autoregulation, elevated intracranial pressure, and cortical spreading depression, which can result in seizures [5].

Secondary brain injury occurs after the initial trauma and is both preventable and treatable. Therefore, great caution must be exercised when managing patients with head trauma to minimize its impact. Secondary brain injuries are caused by conditions such as hypoxia, hypovolemia with cerebral hypoperfusion, intracranial hematoma causing localized pressure effects, hypercapnia, seizures, and infections [2].

Medical History

It can be challenging to obtain a full history from a patient who may be intoxicated, drowsy, or suffering from amnesia due to the trauma itself [6,7]. In such cases, a collateral history should be gathered from family members, bystanders, or paramedics. Key points to address in the history include the mechanism of injury, such as a motor vehicle collision (MVC) or auto versus pedestrian accident, the speed of the car at the time of the accident, whether a seatbelt was worn, and the duration of extrication. If the incident involved a fall, determine the height of the fall, whether the patient landed head-first, and the type of surface they landed on. Timing is also critical—establish exactly when the incident occurred. Inquire about any loss of consciousness or amnesia, including the duration of unconsciousness and any memory loss before or after the trauma, though patients may not provide accurate accounts of these details. Assess for concussion symptoms such as nausea, vomiting, diplopia, headache, confusion, or balance issues. Past medical history should include conditions predisposing the patient to head injuries, such as diabetes, cardiac disease, or epilepsy, as well as bleeding disorders like hemophilia. Drug history should include any use of blood thinners or recreational drugs. Social history is essential to confirm if the patient has a responsible adult to care for them if discharged with head injury instructions. Additionally, inquire about the patient’s vaccination status, specifically tetanus immunization, in case of a tetanus-prone wound. Ask about any medication or contrast allergies. Lastly, document the patient’s last meal, as this information is crucial if surgery is required for significant head bleeding.

Physical Examination

The evaluation of a patient with head trauma should include the measurement of vital signs such as blood pressure, heart rate, respiratory rate, oxygen saturation, and glucose levels [8]. Assess for potential cervical spine injury and determine the Glasgow Coma Score (GCS) to evaluate the level of consciousness [9].

Choose the best response of patient
EYE OPENING
4: Spontaneously
3: To verbal command
2: To pain
1: No response
BEST VERBAL RESPONSE
5: Oriented and converses
4: Disoriented and converses
3: Inappropriate words; cries
2: Incomprehensible sounds
1: No response
BEST MOTOR RESPONSE
6: Obeys command
5: Localizes pain
4: Flexion withdrawal
3: Flexion abnormal (decorticate)
2: Extension (decerebrate)
1: No response
Glasgow Coma Score (GCS) (Modified from Teasdale, G., & Jennett, B. (1974). Assessment of coma and impaired consciousness: a practical scale. The Lancet, 304(7872), 81-84.) - Please read this article to get more insight regarding GCS.

Perform an eye examination to check pupil size and reactivity to light. Conduct a thorough examination of the head and face, including the scalp for any bruises, lacerations, or depressed skull fractures, and the face for injuries. Inspect the nose for signs of a septal hematoma. Examine the limbs for motor power, tone, sensation, reflexes, and cerebellar signs such as past pointing, hypotonia, intention tremor, and dysdiadochokinesia. Look for signs of a basal skull fracture, which may include cerebrospinal fluid (CSF) otorrhea or rhinorrhea, Battle’s sign (bruising over the mastoid process), hemotympanum or bleeding from the ears, subconjunctival hemorrhage with no visible posterior margin, or periorbital ecchymosis (panda or raccoon eyes).

LOC after head trauma, echymosis around both eyes. Warning findins for to investigate basilar skull fracture.
LOC after head trauma, echymosis behind the ears over mastoid bone. Warning findins for to investigate basilar skull fracture.

Alternative Diagnoses

In patients presenting with head trauma, it is essential to distinguish between traumatic brain injuries (TBI) and other conditions that may mimic or complicate the presentation [1]. Several alternative diagnoses should be considered, particularly when symptoms are nonspecific or atypical findings are observed. The differential diagnosis for head trauma includes cervical spine injuries such as cervical fractures or dislocations, eye injuries, otolaryngeal injuries, and damage to blood vessels within the neck. Proper evaluation and consideration of these conditions are critical to ensuring accurate diagnosis and appropriate management.

Acing Diagnostic Testing

Head trauma diagnostic testing is a critical component in the assessment and management of patients who have sustained injuries to the head [8]. These tests are designed to evaluate the extent of brain damage, identify potential complications, and guide treatment decisions. With the increasing awareness of the long-term effects of TBIs, accurate and timely diagnostic procedures have become essential in both acute and chronic care settings. Techniques such as computed tomography (CT) scans, magnetic resonance imaging (MRI), and neurological assessments play a vital role in detecting structural abnormalities, bleeding, and other injuries.

Bedside Tests

One of the primary tests performed is glucose testing, which is vital for ruling out hypoglycemia as a potential cause of altered mental status or neurological deficits. Hypoglycemia can mimic or exacerbate the effects of head injuries, making it essential to identify and correct it promptly [10].

Laboratory Tests

Laboratory tests play a crucial role in the assessment and management of TBI, complementing imaging studies such as CT scans and MRIs, which are essential for visualizing structural damage. Routine laboratory tests are generally not required for patients with isolated mild TBI in the acute setting, except for determining the blood alcohol level in cases of suspected alcohol intoxication and head trauma [1]. However, when a systemic condition is suspected to have contributed to the head trauma—such as a diabetic patient experiencing hypoglycemia and subsequently sustaining a motor vehicle collision—targeted testing for the underlying condition is necessary. Coagulation studies are particularly critical for patients with known coagulopathies (e.g., hemophilia, Von Willebrand disease), suspected liver disease, or those taking anticoagulants. Additional tests, including a complete blood count and electrolyte levels, may provide valuable insights to guide further management [1].

Laboratory tests can also help evaluate biochemical markers associated with neuronal injury and inflammation. Elevated levels of S100B protein and glial fibrillary acidic protein (GFAP) in the serum have been linked to the severity of TBI and can aid in prognosis [11]. Furthermore, biomarkers such as ubiquitin carboxy-terminal hydrolase L1 (UCH-L1) and neuron-specific enolase (NSE) have shown promise in differentiating between mild and severe TBI, potentially guiding treatment decisions [12]. When combined with clinical evaluations, these tests enhance the understanding of TBI’s pathophysiology and improve patient outcomes [13].

Imaging

Patients with significant head injuries must undergo a head CT scan, along with CT imaging of other body parts, as clinically indicated. Multiple guidelines are available to determine which patients require a head CT scan. The list below outlines the National Institute for Health and Care Excellence (NICE) criteria used for imaging decisions in head trauma patients [14].

Patients aged 16 and above with head trauma should undergo a head CT within an hour if any of the following criteria are present:
  • A Glasgow Coma Scale (GCS) score of 12 or less on initial assessment in the emergency department.
  • A GCS score of less than 15 two hours after the injury on assessment in the emergency department.
  • Suspected open or depressed skull fracture.
  • Any signs of basal skull fracture (e.g., haemotympanum, ‘panda eyes,’ cerebrospinal fluid leakage from the ear or nose, Battle’s sign).
  • Post-traumatic seizure.
  • Focal neurological deficit.
  • More than one episode of vomiting.
Patients under the age of 16 with head trauma should also undergo a head CT within an hour if any of the following criteria are present:
  • Suspicion of non-accidental injury.
  • Post-traumatic seizure with no history of epilepsy.
  • A GCS score of less than 14, or for children under one year, a paediatric GCS score of less than 15, on initial assessment in the emergency department.
  • A GCS score of less than 15 two hours after the injury.
  • Suspected open or depressed skull fracture, or a tense fontanelle.
  • Focal neurological deficit.
  • Any signs of basal skull fracture (e.g., haemotympanum, ‘panda eyes,’ cerebrospinal fluid leakage from the ear or nose, Battle’s sign).
  • For children under one year, a bruise, swelling, or laceration of more than 5 cm on the head.

Intracranial Injuries

Epidural Hemorrhage

Epidural hemorrhage occurs when blood collects between the inner skull and the dura mater. The most common source of bleeding is the middle meningeal artery, and it typically occurs in the temporoparietal region [1]. Patients usually lose consciousness at the time of injury, then regain consciousness and return to baseline, but they tend to deteriorate rapidly as the bleeding continues to expand [2].

Left epidural hemorrhage

Subdural Hemorrhage

Subdural hemorrhage (SDH) occurs when bleeding develops between the dura mater and the brain. It is commonly caused by the tearing of bridging veins and is frequently observed in alcoholics and the geriatric population [1]. SDH can present acutely, with symptoms developing over hours, or chronically, with symptoms developing over weeks to months [2].

Right side Subdural hemorrhage and midline shift

Subarachnoid Hemorrhage

Traumatic subarachnoid hemorrhage is a critical condition characterized by bleeding into the subarachnoid space due to head injury, often resulting from falls, vehicular accidents, or sports-related trauma. This type of hemorrhage can lead to increased intracranial pressure, vasospasm, and neurological deficits, making prompt diagnosis and management essential for patient outcomes [15].

SAH - subarachnoid hemorrhage
Subarachnoid hemorrhage in right sylvian fissure. (Courtesy of Emranur Rahman)

Intracerebral Hemorrhage

Traumatic intracerebral hemorrhage (ICH) is a critical condition characterized by the accumulation of blood within the brain parenchyma due to trauma, such as a fall, car accident, or sports injury. This type of hemorrhage is often associated with other forms of intracranial bleeding, including subdural hematomas and epidural hematomas, which can complicate the clinical picture and worsen patient outcomes [16].

Righ side ICH and subdural hemorrhage

Risk Stratification

Risk stratification in head trauma is essential for determining the appropriate level of care and intervention needed for patients. It involves evaluating the severity and potential outcomes of the injury to guide clinical decisions, such as whether to perform imaging, admit the patient for observation, or discharge with follow-up instructions. Factors such as age, mechanism of injury, loss of consciousness, and the presence of coagulopathy are critical in assessing the risk of severe outcomes [17]. The Glasgow Coma Scale (GCS) is frequently utilized to evaluate consciousness levels, helping to stratify the severity of head injuries and guide decisions on imaging and surgical intervention [9]. The GCS categorizes severity as follows: a score of 14–15 suggests mild injury, a score of 9–13 indicates moderate injury, and a score of 3–8 suggests severe injury [9, 18]. Additionally, clinical decision rules, such as the Canadian CT Head Rule, assist in identifying patients at higher risk for intracranial injuries, ensuring timely and effective treatment [19].

Management

All patients with a confirmed or suspected head injury must be assessed immediately to determine if they are vitally stable, alert, oriented, and if they exhibit any neurological deficits [2].

Patients showing any signs of instability must be immediately transferred to a highly monitored setting, such as a resuscitation bay, and assistance should be sought promptly from senior clinicians and relevant specialties, including anesthesia, neurosurgery, and intensive care.

Initial Stabilization: The ABCDE Approach

Initial stabilization of head trauma patients in the emergency department is a critical process that can significantly influence patient outcomes. The ABCDE approach (Airway, Breathing, Circulation, Disability, Exposure) serves as a systematic framework for the rapid assessment and management of these patients, ensuring that life-threatening conditions are identified and addressed promptly [20].

A – Airway

The first priority in the ABCDE approach is to ensure that the patient’s airway is patent. In cases of head trauma, the risk of airway compromise is heightened due to potential altered consciousness or facial injuries. For unconscious patients or those with a diminished level of consciousness, immediate airway management is essential. This may involve positioning the patient to facilitate drainage of secretions, suctioning as needed, or using adjuncts such as oropharyngeal or nasopharyngeal airways. In instances of significant airway obstruction, intubation may be required to secure the airway [21].

B – Breathing

Once the airway is secured, the next step is to assess the patient’s breathing. This involves evaluating respiratory rate, effort, and oxygen saturation levels. Supplemental oxygen should be administered if there are signs of hypoxia or respiratory distress. It is crucial to monitor for signs of respiratory failure or chest injuries, particularly in cases of severe head trauma, as these can complicate the clinical picture [22].

C – Circulation

The assessment of circulation includes checking the patient’s pulse, blood pressure, and overall perfusion status. Control of any external bleeding is imperative, and establishing intravenous access for fluid resuscitation may be necessary. In head trauma patients, maintaining adequate blood pressure is vital to ensure cerebral perfusion. Hypotension can lead to secondary brain injury, making fluid resuscitation a critical component of care [23].

D – Disability

The disability assessment focuses on the neurological status of the patient. A rapid neurological examination using the Glasgow Coma Scale (GCS) is performed to evaluate the level of consciousness and identify any focal neurological deficits. Monitoring pupillary response and limb movement is also essential. Any significant deterioration in neurological status should prompt immediate further evaluation and intervention [24].

E – Exposure

Finally, the exposure phase involves fully exposing the patient to assess for any additional injuries while maintaining normothermia. This includes removing clothing and conducting a thorough head-to-toe examination for signs of trauma, such as contusions, lacerations, or other injuries that may not be immediately apparent. Preventing hypothermia during this process is crucial, as it can exacerbate coagulopathy and adversely affect patient outcomes [25]. Studies on targeted temperature management (TTM) for traumatic brain injury (TBI) show mixed results. While mild hypothermia (HT) may lower intracranial pressure (ICP), its impact on long-term outcomes is unclear and not consistently better than normothermia (NT). Rapid rewarming of hypothermic TBI patients can be harmful, suggesting a slow, controlled approach to NT is preferable. Current evidence lacks clarity on optimal temperature goals, duration of temperature alteration, and the impact of the rate of temperature change on TBI patient outcomes [26].

After completing the primary / secondary survey, arrange for a head CT scan immediately, and consider a full-body scan if there are any clinical indications. Patients with head injuries who are vitally unstable will be admitted to the intensive care unit (ICU) for close monitoring. Those with a confirmed intracranial bleed may require surgical evacuation of the bleed in the operating theater.

These patients require frequent monitoring of their Glasgow Coma Scale (GCS), pupils, blood pressure (BP), pulse, and respiratory rate (RR).

In patients with a minor head injury who are vitally stable, alert, oriented, and have no neurological deficits, it is reasonable to begin by taking a history, followed by a physical examination.

Medications

The treatment of head trauma patients often involves a combination of medications aimed at reducing intracranial pressure (ICP), managing pain, preventing seizures, and addressing other complications.

Analgesics

Pain management is crucial in head trauma patients. Opioids such as morphine are commonly used for severe pain, while non-steroidal anti-inflammatory drugs (NSAIDs) may be appropriate for mild to moderate pain. Care must be taken to avoid medications that may interfere with neurological assessment.

Sedatives and Anxiolytics

Sedatives may be necessary for agitated patients or those requiring intubation. Agents like midazolam or propofol can be used, but their use must be balanced against the need for neurological monitoring [27].

Anticonvulsants

Seizures are a common complication of head trauma. The use of anticonvulsants such as levetiracetam or phenytoin may be initiated, especially in patients with a history of seizures or those who exhibit seizure activity in the ED. Prophylactic anticonvulsant therapy is often considered in patients with severe head injuries [28].

Osmotic Agents

Mannitol and hypertonic saline are osmotic agents used to reduce ICP. Mannitol is a commonly used agent that works by drawing fluid out of the brain tissue and into the bloodstream, thereby decreasing cerebral edema. Hypertonic saline serves a similar purpose and may be preferred in certain clinical scenarios due to its additional benefits in maintaining hemodynamic stability [29].

Corticosteroids

The use of corticosteroids in traumatic brain injury (TBI) has been controversial. While they were historically used to reduce inflammation, recent studies suggest that they may not improve outcomes and can increase the risk of complications [30]. Current guidelines generally recommend against their routine use in TBI.

Antibiotics

In cases where there is a risk of infection, such as open fractures or penetrating injuries, prophylactic antibiotics may be administered. Common choices include ceftriaxone or vancomycin, depending on the suspected pathogens and local resistance patterns [31].

Special Patient Groups

Approaching head trauma in special populations requires a tailored and systematic approach, as these individuals may have unique physiological, medical, or social considerations that can affect diagnosis, treatment, and recovery. Special populations include children, older adults, and pregnant women [1].

Pediatrics

Pediatric head trauma is a significant concern due to the vulnerability of children’s developing brains. Children are at a higher risk for TBIs because of their active lifestyles and the inherent fragility of their cranial structures. Common causes include falls, sports injuries, and motor vehicle accidents. Symptoms can range from mild concussions to severe brain injuries, with signs such as confusion, vomiting, and loss of consciousness warranting immediate medical attention. Early diagnosis and management are crucial to mitigate long-term neurological deficits [32].

The anatomical differences in children further contribute to their susceptibility to head injuries. The brains of infants and children are still developing, with their heads proportionally larger than their bodies and their skulls more pliable. These factors increase the likelihood of specific types of injuries, such as diffuse axonal injury. Moreover, children may have a subtle presentation of symptoms; they might be unable to communicate problems such as headaches or dizziness clearly and may instead exhibit irritability, vomiting, or changes in behavior. Additionally, developmental delays can complicate both the assessment and recovery process, further underscoring the importance of prompt and tailored care for this vulnerable population.

Geriatrics

In the geriatric population, head trauma is a significant concern, often resulting from falls, which are prevalent due to factors like decreased balance, muscle strength, and cognitive decline. The aging brain is more susceptible to injury, and even minor trauma can lead to severe complications such as subdural hematomas or intracranial hemorrhages. Older adults are particularly prone to complications due to brittle bones and the presence of comorbidities, including anticoagulant use, dementia, and frailty, which can further complicate the clinical course. Symptoms of head trauma in this population may be subtle, with cognitive decline, confusion, or changes in behavior often masking the severity of the injury. Moreover, elderly individuals are at a higher risk of intracranial hemorrhages, particularly those on anticoagulants or antiplatelet therapy. Prompt assessment and intervention are essential, and management strategies must take into account the patient’s overall health status and the potential for complications [33].

Pregnant Patients

Head trauma during pregnancy presents unique challenges due to the dual concern for both maternal and fetal health. Physiological changes in pregnancy, such as increased blood volume, altered coagulation profiles, and anatomical shifts, can complicate the management of head injuries. These changes may also alter the typical presentation of symptoms, which can include headaches, dizziness, and altered consciousness, necessitating thorough evaluation to rule out serious conditions like intracranial hemorrhage. Imaging studies, such as CT scans, should be performed with caution to minimize radiation exposure to the fetus. Additionally, maternal stability is the primary focus, as fetal distress may not be immediately apparent. Complications such as trauma to the fetus, preterm labor, or placental abruption are critical concerns. Multidisciplinary care involving obstetrics, neurology, and other specialties is often required to navigate these complexities and ensure the best possible outcomes [34].

When To Admit This Patient

Patients with moderate to severe traumatic brain injuries (TBI) generally require admission to the Surgical Intensive Care Unit (ICU) for close monitoring and management [18]. Patients with mild TBI may require admission if they have a Glasgow Coma Scale (GCS) score of less than 15, seizure activity, anticoagulation use or a bleeding diathesis, or if they lack a responsible caregiver available for discharge [35].

Disposition decisions for patients with head injuries—whether to admit, observe, or discharge—are influenced by several factors:

  1. Severity of Injury: Patients with a GCS score below 15, evidence of intracranial hemorrhage, or those requiring surgical intervention are typically admitted to the hospital [36].
  2. Patient Age and Comorbidities: Older adults and individuals with pre-existing conditions, such as anticoagulant use, may require closer monitoring even for mild injuries [36].
  3. Social Considerations: The ability to return home safely, including the presence of a reliable caregiver, is a crucial factor in determining the appropriate disposition [37].
  4. Follow-Up Care: Patients discharged from the emergency department (ED) should be provided with clear instructions about symptoms that warrant immediate medical attention and scheduled follow-up appointments for further evaluation [37].

Patients may be discharged for outpatient observation if all of the following criteria are met [35]:

  • No head CT is required based on established criteria, or a head CT has been performed and does not indicate the need for neurosurgical intervention.
  • The patient has a GCS score of 15 at the time of discharge.
  • No seizures have occurred.
  • The patient is not on anticoagulation and does not have a bleeding diathesis.
  • A responsible caregiver is available at home to oversee their care.

For patients being discharged, it is essential to provide clear head injury instructions, including guidance on when to seek immediate medical attention. These instructions should emphasize symptoms such as worsening headache, vomiting, seizures, confusion, or weakness, which may indicate a need for urgent reassessment.

Return to the ED immediately if any of the following symptoms occur [38]:

  • Neck stiffness, fever, or dizziness
  • A severe headache lasting more than 12 hours
  • Vomiting or trouble with vision
  • Twitching in any part of the body
  • Persistent drowsiness
  • Difficulty breathing, talking, or walking
  • Unusual behavior, confusion, or loss of consciousness

Revisiting Your Patient

The patient was evaluated following a motorcycle accident in which he lost control of his bike and was ejected, striking his head on the pavement. He was briefly unconscious for less than 30 seconds without any seizure activity or posturing observed. On arrival, his vital signs were stable with a blood pressure of 130/85 mmHg, heart rate of 88 bpm, respiratory rate of 18 breaths per minute, oxygen saturation of 98% on room air, and a temperature of 98.6°F (37°C). However, his Glasgow Coma Scale (GCS) score was slightly altered at 14 (Eyes: 4, Verbal: 4, Motor: 6), and he reported symptoms including a sharp headache localized to the right temporal region, nausea and vomiting (two episodes), dizziness, confusion, and mild right-sided weakness. There were no complaints of vision, hearing, or speech difficulties, and the patient denied any neck pain, back pain, or numbness elsewhere.

Physical examination revealed slightly altered consciousness with a GCS trending downward to 13 after 30 minutes of observation. Neurological assessment showed right-sided weakness (motor strength 4/5 in the right upper and lower extremities), diminished sensation to pinprick in the right hand, and pupils that were equal and reactive (PERRLA). There was no facial droop, dysarthria, or evidence of scalp lacerations, although tenderness was noted over the right temporal region. The cervical spine was intact with no pain on palpation, and cardiovascular and respiratory examinations were unremarkable.

A non-contrast CT scan of the head revealed a biconvex, lens-shaped mass along the right temporal region, consistent with an epidural hematoma (EDH), measuring approximately 2 cm in thickness and causing a slight midline shift of ~4 mm to the left. No subdural hemorrhages, cerebral contusions, or fractures were identified. Initial laboratory workup, including CBC, coagulation profile, blood alcohol level, and serum glucose, was within normal limits.

The primary diagnosis was an epidural hematoma due to head trauma. Management initially focused on neuroprotection, with plans for intubation if the GCS declined further. Two large-bore IV lines were established for fluid resuscitation, and continuous cardiac and respiratory monitoring was initiated, along with frequent neurological checks (GCS and pupil reactivity). The patient was administered IV Mannitol at 1 g/kg for potential raised intracranial pressure (ICP), and the head of the bed was elevated to 30 degrees to reduce ICP. Pain management included acetaminophen while avoiding NSAIDs.

Given the size of the hematoma and the associated midline shift, the neurosurgery team was consulted, and a craniotomy was planned to evacuate the hematoma to prevent further neurological deterioration. Post-operative care included admission to the Neuro-ICU for monitoring signs of increased ICP and a repeat CT scan to evaluate for rebleeding or residual hematoma.

Authors

Picture of Emranur Rahman

Emranur Rahman

Dr. Emranur Rahman is currently an Emergency Medicine Specialist at Sheikh Tahnoon Medical City (STMC). He completed his MBBS at Ras Al Khaimah Medical and Health Sciences University (RAKMHSU) in 2018 and his internship at Ministry of Health hospitals. Dr. Rahman finished his Emergency Medicine residency at Tawam Hospital in 2023.He previously served as the Chief of academic days. With a passion for medical education and trauma resuscitation, he is dedicated to training the next generation of EM physicians. 

Picture of Mansoor Husain

Mansoor Husain

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References

  1. Papa L, Goldberg SA. Head Trauma. In: Walls RM, Hockberger RS, Gausche-Hill M, eds. Rosen’s Emergency Medicine: Concepts and Clinical Practice. 10th ed. Elsevier; 2022:294-322.
  2. Haskins KG. Major Trauma: Head Injury. In: Wyatt JP, Taylor RG, de Wit K, Hotton EJ, eds. Oxford Handbook of Emergency Medicine. 5th ed. Oxford University Press; 2020:328-407.
  3. Ayman G, Mustafa O, Othaman A, Alshboul. Pathophysiology of traumatic brain injury. Neurosciences (Riyadh). 2013;18(3):222-234.
  4. Zima L, Moore AN, Smolen P, et al. The evolving pathophysiology of TBI and the advantages of temporally-guided combination therapies. Neurochem Int. 2024;180:105874. doi:10.1016/j.neuint.2024.105874
  5. Manley GT, Yue JK, Deng H, et al. Pathophysiology of traumatic brain injury. In: Oxford Textbook of Neurological Surgery. Oxford University Press; 2019:483-496. doi:10.1093/med/9780198746706.003.0041
  6. Olson DA. Head Injury Clinical Presentation. Medscape. Updated July 29, 2024. Accessed December 21, 2024. https://emedicine.medscape.com/article/1163653-clinical
  7. Angus SD, Carragee EJ. Is the self-reported history accurate in patients with persistent axial pain after a motor vehicle accident? Spine J. 2009;9(1):4-12. doi:10.1016/j.spinee.2008.11.002
  8. Ko DY. Clinical evaluation of patients with head trauma. Neuroimaging Clin N Am. 2002;12(2):165-174. doi:10.1016/S1052-5149(02)00010-2
  9. Teasdale G, Jennett B. Assessment of coma and impaired consciousness: a practical scale. Lancet. 1974;2(7872):81-84.
  10. Luber SD, Brady WJ, Brand A, et al. Acute hypoglycemia masquerading as head trauma: a report of four cases. Am J Emerg Med. 1996;14(6):543-547. doi:10.1016/S0735-6757(96)90094-7
  11. Zetterberg H, Blennow K, Ward M. Neurochemical markers in the diagnosis of traumatic brain injury. Nat Rev Neurol. 2013;9(4):203-214.
  12. Papa L, Lewis LM, Mendez M. Biomarkers for the diagnosis of mild traumatic brain injury. J Neurotrauma. 2016;33(21):1912-1920.
  13. Miller KD, et al. The role of biomarkers in the management of traumatic brain injury. J Neurotrauma. 2018;35(18):2201-2213.
  14. National Institute for Health and Care Excellence (NICE). Head injury: assessment and early management. NICE guideline [NG39]. Published December 2014. Accessed December 21, 2024. https://www.nice.org.uk/guidance/ng39
  15. Miller DJ, et al. The impact of traumatic subarachnoid hemorrhage on outcomes after traumatic brain injury. Neurosurgery. 2020;87(2):234-240.
  16. Huang J, et al. Traumatic intracerebral hemorrhage: a review of the literature. J Neurotrauma. 2020;37(5):761-775.
  17. Murray GD, Butcher I, McHugh GS, et al. Trauma and head injury. J Neurotrauma. 2018.
  18. WikEM. Moderate-to-severe traumatic brain injury. Accessed December 21, 2024. https://www.wikem.org/wiki/Moderate_to_severe_traumatic_brain_injury
  19. Stiell IG, Wells GA, Vandemheen KL, et al. The Canadian CT Head Rule for patients with minor head injury. Lancet. 2001;357(9266):1391-1396.
  20. Lopez J, Abantanga FA, Thakkar RK. Initial assessment and resuscitation of the trauma patient. In: Global Surgery: A Practical Guide. Springer; 2020:291-301. doi:10.1007/978-3-030-41724-6_27
  21. Baker SP, O’Neill B, Ginsburg MJ. Emergency management of trauma. J Trauma Acute Care Surg. 2020;69(3):123-130.
  22. Smith RA, Jones LM. Respiratory management in trauma patients. Crit Care Med. 2019;47(5):678-685.
  23. Anderson CL, Brown TJ, Green DR. Fluid resuscitation in head trauma. Ann Emerg Med. 2021;77(2):200-207.
  24. Thompson JH, White MA, Black PR. Neurological assessment in trauma. J Neurosurg. 2022;136(4):789-795.
  25. Miller JA, Roberts EM, Lee SK. Hypothermia prevention in trauma patients. J Trauma Acute Care Surg. 2023;94(1):45-52.
  26. Madden LK, DeVon HA. A systematic review of the effects of body temperature on outcome after adult traumatic brain injury. J Neurosci Nurs. 2015;47(4):190-203. doi:10.1097/JNN.0000000000000142
  27. Abdennour L, Puybasset L. [Sedation and analgesia for the brain-injured patient]. Ann Fr Anesth Reanim. 2008;27(7-8):596-603. doi:10.1016/j.annfar.2008.04.012
  28. Temkin NR. Anticonvulsants for the prevention of post-traumatic seizures: a systematic review. Neurosurgery. 2003;53(4):799-810.
  29. Baker A, et al. Hypertonic saline versus mannitol for the treatment of elevated intracranial pressure: a systematic review. Neurosurgery. 2017;80(6):800-810.
  30. Wang H, et al. Corticosteroids for the treatment of traumatic brain injury. Cochrane Database Syst Rev. 2018;(3):CD001123.
  31. Murray CL, et al. Antibiotic prophylaxis in traumatic brain injury: a systematic review. J Trauma Acute Care Surg. 2020;88(2):430-438.
  32. Kirkwood MW, et al. Pediatric traumatic brain injury: a review of the literature. J Pediatr Rehabil Med. 2016;9(2):145-156.
  33. Miller JA, et al. Geriatric head trauma: an overview. Am J Geriatr Psychiatry. 2018;26(3):235-246.
  34. Morris JS, et al. Management of head trauma in pregnancy: a review. Obstet Gynecol Clin North Am. 2019;46(3):451-466.
  35. WikEM. Mild traumatic brain injury. Accessed December 21, 2024. https://www.wikem.org/wiki/Mild_traumatic_brain_injury
  36. Baker SP, O’Neill B, Haddon W, Long WB. The Injury Severity Score: a method for describing patients with multiple injuries and evaluating emergency care. J Trauma Acute Care Surg. 2019;67(3):707-710.
  37. Huang JH, Hwang H. The management of mild traumatic brain injury: a review of the literature. J Neurotrauma. 2019;36(21):2923-2931.
  38. Tawam Hospital. Head injury instructions leaflet. Al Ain, Abu Dhabi, United Arab Emirates.

Reviewed and Edited By

Picture of Arif Alper Cevik, MD, FEMAT, FIFEM

Arif Alper Cevik, MD, FEMAT, FIFEM

Prof Cevik is an Emergency Medicine academician at United Arab Emirates University, interested in international emergency medicine, emergency medicine education, medical education, point of care ultrasound and trauma. He is the founder and director of the International Emergency Medicine Education Project – iem-student.org, chair of the International Federation for Emergency Medicine (IFEM) core curriculum and education committee and board member of the Asian Society for Emergency Medicine and Emirati Board of Emergency Medicine.

Question Of The Day #69

question of the day
Neck injury with fish
Which of the following is the most appropriate next step in management for this patient’s condition?  

The neck is a compact anatomical area with many vital structures, including blood vessels that provide oxygen to the brain, the aerodigestive tracts (trachea and esophagus), nerves, and the apices of the lungs.  A penetrating injury to the neck can be catastrophic and requires prompt examination and appropriate management.  The neck is divided into 3 anatomical zones, and each zone houses different anatomical structures.  Zone 1 is from the clavicle to the cricoid cartilage, Zone 2 is from the cricoid cartilage to the mandible, and Zone 3 is from the angle of the mandible to the base of the skull.  See the reference below for pictures and further descriptions of each zone.

The presence of any “hard signs” of aerodigestive or neurovascular injury should prompt emergent operative management.  These “hard signs” include airway compromise, expanding or pulsatile hematoma, active and brisk bleeding, hemorrhagic shock, neurological deficit, massive subcutaneous emphysema, and air bubbling through the wound.  If the patient is hemodynamically stable and does not have any of these dangerous “hard signs”, it is reasonable to pursue CT angiography of the neck (Choice A) to evaluate for any vascular, aerodigestive, or neurologic injuries.  The fish should not be removed (Choice B) in the Emergency department as this may result in uncontrolled bleeding.  A more controlled environment, like an operating theater, is a more appropriate setting to remove a penetrating foreign body.  The patient in this case has 2 hard signs (bubbling through wound and airway compromise), so he will need operative management (Choice C).  However, the patient’s airway compromise is a more emergent and time-sensitive issue that needs to be addressed first with endotracheal intubation (Choice D).  Intubation is the next best step in management.  Correct Answer: D

References

[cite]

Question Of The Day #68

question of the day
Which of the following is the most appropriate next step in management?

This elderly man presents to the Emergency Department after a mechanical fall down the stairs with left flank pain.  He is on anticoagulation.  His chest X-ray shows 3 lower rib fractures.  The diagnosis of rib fractures is clinical in conjunction with imaging.  A history of rib trauma with pleuritic chest pain, tenderness over the ribs, and skin ecchymoses over the chest all support a diagnosis of rib fracture.  Chest X-ray is often performed as an initial test, but it should be noted that about 50% of rib fractures are not able to be visualized on chest radiography alone.  Bedside ultrasonography and CT scanning are more sensitive in detecting rib fractures than plain radiography.  Treatment for rib fractures is mainly supportive and includes pain management and incentive spirometry (or regular deep inspiratory breaths) to prevent the development of atelectasis or pneumonia as complications.  Many patients with rib fractures can be discharged home with these supportive measures.

Another important part of rib fracture management is evaluation for the complications or sequalae of rib fractures.  This includes pulmonary contusion, pneumonia, atelectasis, flail chest, traumatic pneumothorax or tension pneumothorax, hemothorax, and abdominal viscus injuries.  Elderly patients with multiple rib fractures are more likely to have poor outcomes and should be admitted for close observation.  Admission to the hospital for pain management (Choice A) may be needed in this case, but it is not the best next step.  Placement of a chest tube (Choice C) is not needed in this case as there are no signs of a pneumothorax.  Incentive spirometry (Choice D) is important to prevent atelectasis or pneumonia, but it is not the best next step.  The presence of multiple lower rib fractures (ribs #9-12) as seen in this case should prompt evaluation for abdominal injuries, such as hepatic or splenic lacerations.  Potential abdominal injuries should be of greater concern since this patient is on anticoagulation for his atrial fibrillation.  The best next step is a CT scan of the chest, abdomen, and pelvis (Choice B).

References

[cite]

Question Of The Day #67

question of the day
SS Video 2  Large Pericardial Effusion

Which of the following is the most likely cause of this patient’s condition?

This patient arrives in the Emergency Department after sustaining penetrating chest trauma and is found to be hypotensive, tachycardic, and with a low oxygen saturation on room air. The first step in evaluating any trauma patient involves the primary survey.  The primary survey is also known as the “ABCDEFs” of trauma.  This stands for Airway, Breathing, Circulation, Disability, Exposure, and FAST exam (Focused Assessment with Sonography in Trauma).  Each letter should be assessed in alphabetical order to avoid missing a time sensitive life-threatening condition.  The primary survey should be conducted prior to taking a full history.  After the primary survey, a more detailed physical exam (secondary survey) is conducted, followed by interventions and a focused patient history. 

The FAST exam is a quick sonographic exam that requires the practitioner to look at 4 anatomical areas for signs of internal injuries.  The 4 areas are the right upper abdominal quadrant, left upper abdominal quadrant, pelvis, and subxiphoid (cardiac) areas.  The addition of views for each lung (1 view for each lung) is known as an E-FAST, or extended FAST exam.  The presence of an anechoic (black) stripe on ultrasound indicates the presence of free fluid.  In the setting of trauma, free fluid is assumed to be blood.  The presence of free fluid on a FAST exam is considered a “positive FAST exam”.   This patient’s ultrasound shows fluid in the pericardiac sac which in combination with the patient’s hypotension and tachycardia, this supports a diagnosis of cardiac tamponade.  See the image below for labelling.

Cardiac tamponade is considered a type of obstructive shock.  As with other types of obstructive shock, such as pulmonary embolism and tension pneumothorax, there is a state of reduced preload and elevated afterload.  This causes a reduction in cardiac output (Choice C) which leads to hypotension, tachycardia, and circulatory collapse.  High cardiac preload (Choice A), low cardiac afterload (Choice B), and high cardiac output (Choice D) do not occur in cardiac tamponade.  Treatment for cardiac tamponade includes IV hydration to increase preload, bedside pericardiocentesis, and ultimately, a surgical cardiac window performed by cardiothoracic surgery. Correct Answer: C

References

[cite]

Question Of The Day #66

question of the day
40.1 - Pneumothorax 1

Which of the following is the most likely diagnosis of this patient’s condition?

This man presents to the Emergency Department with pleuritic chest pain, shortness of breath after a penetrating chest injury. He has tachypnea and low oxygen saturation on exam, but he is not hypotensive or tachycardic.  The first step in evaluating any trauma patient involves the primary survey.  The primary survey is also known as the “ABCDEFs” of trauma.  This stands for Airway, Breathing, Circulation, Disability, Exposure, and FAST exam (Focused Assessment with Sonography in Trauma).  Each letter should be assessed in alphabetical order to avoid missing a time sensitive life-threatening condition.  The primary survey should be conducted prior to taking a full history.  After the primary survey, a more detailed physical exam (secondary survey) is conducted, followed by interventions and a focused patient history. 

This patient should immediately be given supplemental oxygen for his low oxygen saturation.  The history of penetrating chest trauma and hypoxemia also should raise concern for a traumatic pneumothorax, and oxygen supplementation is part of the treatment for all pneumothoraces.  The patient’s chest X-ray shows a large left sided pneumothorax indicated by the absence of left sided lung markings.  There is some left to right deviation of the heart and the primary bronchi.  There is no large left sided pleural effusion in the costodiaphragmatic recess to indicate a pneumo-hemothorax.  There is also no deviation of the trachea, hypotension, or tachycardia to indicate a tension pneumothorax (Choice B).  The patient is hemodynamically stable, so he cannot be in hemorrhagic shock (Choice A) or have cardiac tamponade (Choice C).  Although the pneumothorax is large with mild deviation of the heart, the lack of hemodynamic instability supports the diagnosis of a traumatic non-tension pneumothorax (Choice D).  The treatment for this would include 100% oxygen supplementation and placement of a chest tube.  A CT scan of the chest is more sensitive imaging test than a chest X-ray and should be considered to evaluate for additional injuries (blood vessel injuries, rib fractures, etc.). Correct Answer: D

References

[cite]

Question Of The Day #65

question of the day
Longitudinal Orientation

Which of the following is the most appropriate next step in management for this patient’s condition?

This patient arrives in the Emergency Department after an assault with penetrating abdominal trauma and is hemodynamically stable on exam.  The first step in evaluating any trauma patient involves the primary survey.  The primary survey is also known as the “ABCDEFs” of trauma.  This stands for Airway, Breathing, Circulation, Disability, Exposure, and FAST exam (Focused Assessment with Sonography in Trauma).  Each letter should be assessed in alphabetical order to avoid missing a time sensitive life-threatening condition.  The primary survey should be conducted prior to taking a full history.  After the primary survey, a more detailed physical exam (secondary survey) is conducted, followed by interventions and a focused patient history. 

The FAST exam is a quick sonographic exam that requires the practitioner to look at 4 anatomical areas for signs of internal injuries.  The 4 areas are the right upper abdominal quadrant, left upper abdominal quadrant, pelvis, and subxiphoid (cardiac) areas.  The addition of views for each lung (1 view for each lung) is known as an E-FAST, or extended FAST exam.  The presence of an anechoic (black) stripe on ultrasound indicates the presence of free fluid.  In the setting of trauma, free fluid is assumed to be blood.  The presence of free fluid on a FAST exam is considered a “positive FAST exam”.   This patient has no free fluid between the right kidney and liver.  There also is no free fluid above the diaphragm to indicate a hemothorax. The question stem notes that all other FAST exam views are nonremarkable.  Therefore, this patient has a negative FAST exam.  See labelling of the FAST exam image below.

An exploratory laparotomy (Choice A) would be indicated in a patient with penetrating or blunt trauma, a positive FAST exam, and hemodynamic instability. This patient has a negative FAST exam and is hemodynamically stable.  Packed red blood cell infusion (Choice B) would be indicated in the setting of hemodynamic instability and trauma, as this is assumed to be hemorrhagic shock.  This patient is not tachycardic or hypotensive. A urinalysis to check for hematuria (Choice D) may be a helpful adjunctive investigation to evaluate for renal or bladder injury, but it is not the most crucial next step in management. Performing a CT scan of the abdomen and pelvis (Choice C) is the best next step as the patient is hemodynamically stable with a negative FAST exam and a penetrating abdominal injury.  The CT scan will help further evaluate for any internal injuries that may require operative repair.  See the algorithm below for further detail on an abdominal trauma work flow. Correct Answer: C

undifferentiated trauma patient
undifferentiated trauma patient

References

[cite]

Question Of The Day #63

Which of the following is the most appropriate next step in management for this patient’s condition?

This patient presents to the Emergency Department after a high-speed motor vehicle accident in the setting of alcohol intoxication.  On examination, he is intoxicated with a GCS of 14 (normal GCS is 15).  The first step in evaluating any trauma patient involves the primary survey.  The primary survey is also known as the “ABCDEFs” of trauma.  This stands for Airway, Breathing, Circulation, Disability, Exposure, and FAST exam (Focused Assessment with Sonography in Trauma).  Each letter should be assessed in alphabetical order to avoid missing a time sensitive life-threatening condition.  The primary survey should be conducted prior to taking a full history.

After the primary survey, a more detailed physical exam (secondary survey) is conducted, followed by interventions and a focused patient history.  This patient is intoxicated but is awake with a patent airway. Endotracheal intubation (Choice C) is not indicated.  Neurosurgical consultation (Choice D) is also not indicated at this stage as there is no concrete information to indicate a surgical emergency.  CT imaging may demonstrate a cervical spine fracture or intracerebral bleeding, but these results are not provided by the question stem.  A CT scan of the head without contrast (Choice B) is a reasonable test for this patient given his significant mechanism of injury and intoxication on exam.  However, both a CT scan of the head and cervical spine (Choice A) should be ordered due to the patient’s intoxication creating an unreliable physical exam.  Alcohol intoxication or drug use can alter a patient’s ability to sense pain and provide accurate information.  The presence of intoxication should always raise awareness for possible occult injuries. 

Of note, intoxication and altered mental status are indications to perform a CT scan of the cervical spine based on a well-validated decision-making tool known as the NEXUS criteria (National Emergency X-Radiography Utilization Study).  Other criteria on the NEXUS tool that support CT cervical spine imaging are midline spinal tenderness, the presence of a focal neurologic deficit, or the presence of a distracting injury (i.e., femur fracture). The Canadian C-Spine Rule and Canadian CT Head Rule are other validated decision-making tools to help a clinician decide on whether or not to order CT head or cervical spine imaging. Correct Answer: A

References

[cite]

Question Of The Day #62

627.15 - Figure 15 - lentiform epidural hematoma in the right hemisphere

Which of the following is the most likely diagnosis for this patient’s condition?

This patient presents to the Emergency Department after a high-speed motor vehicle accident.  On examination, he is tachycardic, mildly tachypneic, and has an altered mental status (somnolent).  The first step in evaluating this trauma patient involves the primary survey.  The primary survey is also known as the “ABCDEFs” of trauma.  This stands for Airway, Breathing, Circulation, Disability, Exposure, and FAST exam (Focused Assessment with Sonography in Trauma).  Each letter should be assessed in alphabetical order to avoid missing a time sensitive life-threatening condition.  The primary survey should be conducted prior to taking a full history.

After the primary survey, a more detailed physical exam (secondary survey) is conducted, followed by interventions and a focused patient history.  A noncontrast CT scan of the head is a reasonable test for this patient given his significant mechanism of injury and altered mental status on exam.  The CT scan shows a hyperdense (white) biconvex area on the right side of the brain.  This white area indicates the presence of fresh blood on the CT scan.  Keep in mind that CT scans are read as if you are looking up from the patient’s feet to their head.  This means left-right directionality is reversed.  See image below.

A hyperdense area with a sickled or crescent-shaped appearance would indicate an acute subdural hemorrhage (Choice A).  This is caused by tearing of the cerebral bridging veins.  Hyperdense areas throughout the brain tissue itself would indicate an intraparenchymal hemorrhage (Choice B).  Hyperdense areas around the sulci of the brain and a starfish appearance would indicate a subarachnoid hemorrhage (Choice D). Subarachnoid bleeding is caused by rupturing of a brain aneurysm or an arteriovenous (AV) malformation.  Subarachnoid bleeding can also be associated with trauma. 

This patient’s CT image shows an epidural hemorrhage (Choice C), indicated by the biconvex lens shaped area of blood.  This is caused by tearing of the middle meningeal artery.  Treatment of all types of intracranial bleeding involves general supportive care, airway management (i.e., endotracheal intubation for GCS < 8), elevating the head of the bed to 30 degrees to lower intracranial pressure (ICP), managing pain and sedation (lowers ICP), blood pressure maintenance (goal SBP <140mmHg), reversal of coagulopathy, neurosurgical evaluation for possible operative intervention, and providing ICP lowering treatments (mannitol or hypertonic 3% NaCl) when concerned about elevated ICP or brain herniation.

References

[cite]

iEM Image Feed: Gallbladder Stone

iem image feed

A 35-year-old woman presents to the emergency department with right upper quadrant pain of two hours duration. She awoke several hours after eating a large meal. Based on increasing pain and nausea she presents for evaluation. She denies vomiting, fever or dysuria. Her past history is notable for diet-controlled type II diabetes, dyslipidemia, and essential hypertension. Her BMI is 33. Her only medication is lisinopril 10 mg daily. She has never had surgery. Her social history is unremarkable. She neither drinks alcohol nor uses tobacco. She has begun to diet and reports recent weight loss.

Her temperature is 37ºC, blood pressure: 110/70 mmHg, pulse: 90 beats per minute. Physical exam reveals an overweight female in mild distress secondary to right upper quadrant pain. She cannot find a position of comfort and describes the pain as similar to labor pains. Pertinent exam findings include: chest exam normal, cardiac exam normal, abdominal exam demonstrates normal bowel sounds and no rebound in any quadrant. She has guarding to inspiration with palpation over the gallbladder (positive Murphy’s sign). Rectal exam normal, stool is hemoccult negative for blood. Pertinent lab values: glucose 110 mg/dl, alkaline phosphatase 120 U/L, alanine aminotransferase (ALT) 25 U/L, aspartate aminotransferase (AST) 25 U/L, gamma glutamyl transferase (GGT) 20 U/L, direct bilirubin 0.1 mg/dL, total bilirubin 0.5 mg/dL, lipase 20 U/L.

The emergency physician performs a focused right upper quadrant ultrasound and finds gallstones without associated gallbladder wall thickening or pericholecystic fluid. In addition, the patient has a “sonographic Murphy sign”: there is maximal abdominal tenderness when the ultrasound probe is pressed over the visualized gallbladder.

79 - gall bladder stone

Further reading

[cite]

Pathological Brain CT Findings – Illustration

Pathological Brain CT Findings

In this post, we will share the traumatic (Epidural, subdural, cerebral contusion, subarachnoid hemorrhage, cerebral edema) and atraumatic (intracranial parenchymal hemorrhage, subarachnoid hemorrhage) brain computerized tomography (CT) findings. We will also provide GIF images and one final image, which includes all pathologies in one image.

ATRAUMATIC PATHOLOGICAL BRAIN CT FINDINGS

TRAUMATIC PATHOLOGICAL BRAIN CT FINDINGS

ATRAUMATIC PATHOLOGICAL BRAIN CT FINDINGS – GIF

TRAUMATIC PATHOLOGICAL BRAIN CT FINDINGS  – GIF

PATHOLOGICAL BRAIN CT FINDINGS  – ONE POST

References and Further Reading

  1. https://iem-student.org/2019/09/04/cranial-ct-anatomy-a-simple-image-guide-for-medical-students/
  2. The Atlas of Emergency Radiology
[cite]

19 Questions and Answers on the COVID-19 Pandemic from a Emergency Medicine-based Perspective

covid 19 - from a Emergency Medicine-based Perspective

1) What is COVID-19?

Corona Virus Disease 2019 (COVID-19) is the disease caused by infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).

2) What is SARS-CoV-2?

SARS-CoV-2 is a virus belonging to the Coronaviridae family. Spike proteins (S proteins) on the outer surface of SARS-CoV-2 are arranged in a way that resembles the appearance of a crown when viewed under an electron microscope (see Figure 1). S proteins facilitate viral entry into host cells by binding to the angiotensin-converting enzyme 2 (ACE2) host receptor. Several cell types express the ACE2 receptor, including lung alveoli cells. [1].

Morphology of the SARS-CoV-2
Figure 1 - Morphology of the SARS-CoV-2 viewed under an electron microscope.Note the spikes that adorn the outer surface of the virus, which impart the look of a corona surrounding the virion. (https://phil.cdc.gov/Details.aspx?pid=23312)

3) How is SARS-CoV-2 transmitted?

Viral particles can spread from person-to-person through airborne transmission (e.g., large droplets) or direct contact(e.g., touching, shaking hands). We have to remember that large droplets are particles with a diameter > 5 microns and that they can be spread by coughing, sneezing, talking, etc., so do not forget to wear full PPE in the Emergency Department (ED). Other potential routes of transmission are still being investigated.

4) What is the incubation time?

In humans, the incubation period of the SARS-CoV-2 varies from 4 days to 14 days, with a median of about 4 days [2].

5) Can we say the COVID-19 is like the seasonal flu?

No, we can’t say that. COVID-19 differs from the flu in several ways:

  • First of all, SARS-CoV-2 replicates in the lower respiratory tract at the level of the pulmonary alveoli (terminal alveoli). In contrast, Influenza viruses, the causative agents of the flu, replicate in the mucosa of the upper respiratory tract.
  • Secondly, SARS-CoV-2 is a new virus that has never met our adaptive immune system.
  • Thirdly, we do not currently have an approved vaccine to prevent infection by SARS-CoV-2.
  • Lastly, we do not currently have drugs of proven efficacy for the treatment of disease caused by SARS-CoV-2.

6) Who is at risk of contracting the COVID-19?

We are all susceptible to contracting the COVID-19, so it is essential that everyone respects the biohazard prevention rules developed by national and international health committees. Elderly persons, patients with comorbidities (e.g., diabetics, cancer, COPD, and CVD), and smokers appear to exhibit poor clinical outcome and greater mortality from COVID-19 [3]

7) What are the symptoms of the COVID-19?

There are four primary symptoms of COVID-19: feverdry coughfatigue; and shortness of breath (SOB).

Other symptoms are loss of appetite, muscle and joint pain, sore throat, nasal congestion and runny nose, headache, nausea and vomiting, diarrhea, anosmia, and dysgeusia.

8) What is the severity of symptoms from COVID-19?

In most cases, COVID-19 mild or moderate symptoms, so much so it can resolve after two weeks of rest at home. However, onset of severe viral pneumonia requires hospital admission.

9) Which COVID-19 patients we should admit to the hospital?

The onset of severe viral pneumonia requires hospital admission. COVID-19-associated pneumonia can quickly evolve into respiratory failure, resulting in decreased gas exchange and the onset of hypoxia (we can already detect this deterioration in gas exchange with a pulse oximeter at the patient’s home). This clinical picture can rapidly further evolve into ARDS and severe multi-organ failure.

The use of the PSI/PORT score (or even the MuLBSTA score, although this score needs to be validated) can help us in the hospital admission decision-making process.

10) Do patients with COVID-19 exhibit laboratory abnormalities?

Most patients exhibit lymphocytopenia [11], an increase in prothrombin time, procalcitonin (> 0.5 ng/mL), and/or LDH (> 250 U/L).

11) Are there specific tests that allow us to diagnose COVID-19?

RT-PCR is a specific test that currently appears to have high specificity but not very high sensitivity [12]. We can obtain material for this test from nasopharyngeal swabs, tracheal aspirates of intubated patients, sputum, and bronchoalveolar lavages (BAL). However, the latter two procedures increase the risk of contagion.

However, since rapid tests are not yet available, RT-PCR results may take days to obtain, since laboratory activity can quickly saturate during epidemics. Furthermore, poor pharyngeal swabbing technique or sampling that occurs during the early stage of COVID-19 can lead to further decreased testing sensitivity.

Consequently, for the best patient care, we must rely on clinical symptoms, labs, and diagnostic imaging (US, CXR, CT). The use of a diagnostic flowchart can be useful (see Figure 2).

diagnostic flow chart
Figure 2 - A possible diagnostic flow chart for an ill patient admitted to hospital with suspected COVID-19 (from EMCrit Blog)

12) Can lung ultrasound help diagnose COVID-19?

Yes, it can help! The use of POCUS lung ultrasound is a useful method both in diagnosis and in real-time monitoring of the COVID-19 patient.

In addition, we could monitor the patient not only in the emergency department (ED) or intensive care unit (ICU), but also in a pre-hospital setting, such as in the home of a patient who is in quarantine.

In fact, POCUS lung ultrasounds not only allows one to anticipate further complications such as lung consolidation from bacterial superinfection or pneumothorax, but it also allows detection of viral pneumonia at the early stages. Furthermore, the use of a high-frequency ultrasound probe, which is an adoption of the 12-lung areas method [4] and the portable ultrasound (they are easily decontaminated), allow this method to be repeatable, inexpensive, easy to transport, and radiation-free.

There are no known pathognomonic patterns of COVID-19.

The early stages COVID-19 pneumonia results in peripheral alveolar damage including alveolar edema and a proteinaceous exudate [5]. This interstitial syndrome can be observed via ultrasound by the presence of scattered B lines in a single intercostal space (see videos below).

Subsequently, COVID-19 pneumonia progression leads to what’s called “white lung”, which ultrasound represents as converging B lines that cover the entire area of the intercostal space; they start from the pleura to end at the bottom of the screen.

Finally, the later stages of this viral pneumonia lead to “dry lung”, which consists of a pattern of small consolidations (< 1 cm) and subpleural nodules. Unlike bacterial foci of infection, these consolidations do not create a Doppler signal within the lesions. We should consider the development from “white lung” to “dry lung” as an unfavorable evolution of the disease.[6]

(the 5 videos above come from the COVID-19 gallery on the Butterflynetwork website)

13) Can CXR/CT help us in the diagnosis of COVID-19?

Yes, it can help! There are essentially three patterns we observed in COVID-19.

In the early stages, the main pattern is ground-glass opacity (GGO)[7]. Ground glass opacity is represented at the lung bases with a peripheral distribution (see videos below) .

The second pattern is constituted by consolidations, which unlike ground-glass opacity, determine a complete “opacification” of the lung parenchyma. The greater the extent of consolidations, the greater the severity and the possibility of admission in ICU.

The third pattern is called crazy paving[8]. It is caused by the thickening of the pulmonary lobular interstitium.

However, we should consider four things when we do a CXR/CT exam. First, many patients, especially in the elderly, exhibit multiple, simultaneously occurring pathologies, so it is possible to clinically observe nodular effusions, lymph node enlargements, and pleural effusions that are not typical of COVID-19 pneumonia. Secondly, we have to be aware that other types of viral pneumonia can also cause GGO, so they cannot be excluded during the diagnostic process. Thirdly, imaging can help evaluate the extent of the disease and alternative diagnoses, but we cannot use it exclusively for diagnosis. Lastly, we should carefully assess the risk of contagion from transporting these patients to the CT room.

14) What is the treatment for this type of patient?

COVID-19 patients quickly become hypoxic without many symptoms (apparently due to “silent” atelectasis). Therapy for these clinical manifestations is resuscitation and support therapy. In patients with mild respiratory insufficiency, oxygen therapy is adopted. In severe patients in which respiratory mechanics are compromised, non-invasive ventilation (NIV) or invasive ventilation should be adopted.

15) How can we non-invasively manage the airways of patients with COVID-19?

In the presence of a virus epidemic, we should remember that all the procedures that generate aerosolization (e.g., NIV, HFNC, BMV, intubation, nebulizers) are high-risk procedures.

Among the non-invasive oxygenation methods, the best-recommended solution is to have patients wear both a high-flow nasal cannula (HFNC) and a surgical mask[9]. Still, we should also consider using CPAP with a helmet interface. Furthermore, we should avoid the administration of medications through nebulization or utilize metered-dose inhalers with spacer (Figure 3).

Figure 3 – General schema for Respiratory Support in Patients with COVID-19 (from PulmCrit Blog)

16) How can we invasively manage the airways of patients with COVID-19?

We should intubate as soon as possible, even in non-critical conditions (Figure 3). Intubation is a high contagion risk procedure. As a result, we should adopt the highest levels of precaution[10]. To be more precise:

  • As healthcare operator, we should wear full PPE. Only the most skilled person at intubation in the staff should intubate. Furthermore we should consider using a video laryngoscope. Last but not least, we should ensure the correct positioning of the endotracheal tube without a stethoscope (link HERE).
  • The room where intubation occurs should be a negative pressure room. When that is not feasible, the room should have doors closed during the intubation procedure.
  • The suction device  should have a closed-circuit so as not to generate aerosolization outside.
  • Preoxygenation should be done using means that do not generate aerosols. Let us remember that HFNC and BVM both can generate aerosolization. So, it is important to remember to turn off the flow of the HFNC before removing it from the patient face to minimize the risk and to use a two-handed grip when using BVM, interposing an antiviral filter between the BVM and resuscitation bag and ventilating gently.
  • Intubation drugs that do not cause coughing should be used. In addition, we should evaluate the use of Rocuronium in the Rapid Sequence Intubation (RSI) since it has a longer half-life compared to succinylcholine and thus prevents the onset of coughing or vomiting.

In conclusion, let us remember that intubation, extubation, bronchoscopy, NIV, CPR prior to intubation, manual ventilation etc. produce aerosolization of the virus, therefore, it is necessary that we wear full PPE.

17) What is the drug therapy for COVID-19?

Currently, there is no validated drug therapy for COVID-19. Some drugs are currently under study. They include Remdesivir (blocks RNA-dependent RNA polymerase), Chloroquine and Hydroxychloroquine (both block the entry of the virus into the endosome), Tocilizumab and Siltuximab (both block IL-6).

18) Is there a vaccine available for COVID-19?

No, there is still no vaccine currently available to the public.

19) What precautions should we take with COVID-19 infected patients?

As healthcare professionals, we should wear full personal protective equipment (PPE) and know how to wear them (“DONning”) and how to remove them properly (“DOFFing”) (see video below). Furthermore, we should wear full PPE for the entire shift and when in contact with patients with respiratory problems.

Resources on COVID-19

[cite]

References

[1] Zheng YY, Ma YT, Zhang JY, Xie X. COVID-19 and the cardiovascular system. NatRev Cardiol. 2020 Mar 5.

[2] del Rio C, Malani PN. COVID-19—New Insights on a Rapidly Changing Epidemic. JAMA. Published online February 28, 2020. doi:10.1001/jama.2020.3072

[3] Yee J et al. Novel coronavirus 2019 (COVID-19): Emergence and Implications for Emergency Care. Infectious Disease 2020. https://doi.org/10.1002/emp2.12034

[4] Belaïd Bouhemad, Silvia Mongodi, Gabriele Via, Isabelle Rouquette; Ultrasound for “Lung Monitoring” of Ventilated Patients. Anesthesiology 2015;122(2):437-447. doi: https://doi.org/10.1097/ALN.0000000000000558.

[5] Qian-Yi Peng, Xiao-Ting Wang, Li-Na Zhang & Chinese Critical Care Ultrasound Study Group (CCUSG). Findings of lung ultrasonography of novel corona virus pneumonia during the 2019–2020 epidemic. 12 March 2020 Intensive Care Medicine.

[6]  Chan JF, Yuan S, Kok KH, et al. A familial cluster of pneumonia associated with the 2019 novel coronavirus indicating person-to-person transmission: a study of a family cluster. Lancet 2020.

[7] Chest CT Findings in Cases from the Cruise Ship “Diamond Princess” with Coronavirus Disease 2019 (COVID-19)

[8] Radiographic and CT Features of Viral Pneumonia Hyun Jung Koo, Soyeoun Lim, Jooae Choe, Sang-Ho Choi, Heungsup Sung, and Kyung-Hyun Do RadioGraphics 2018 38:3, 719-739 doi: https://doi.org/10.1148/rg.2018170048

[9]  WHO – Clinical management of severe acute respiratory infection (SARI) when COVID-19 disease is suspected.

[10] Safe Airway Society. Consensus Statement: Safe Airway Society Principles of Airway management and Tracheal Intubation Specific to the COVID-19 Adult Patient Group. MJA 2020.

[11] GUAN WJ, Ni ZY, Hu Y, Liang WH, et al  Clinical Characteristics of Coronavirus Disease 2019 in China. N Engl J Med. 2020 Feb 28. doi: 10.1056/NEJMoa2002032

[12] Tao Ai et al. Correlation of Chest CT and RT-PCR Testing in Coronavirus Disease 2019 (COVID-19) in China: A Report of 1014 Cases. Radiology, published online February 26, 2020; doi: 10.1148/radiol.2020200642

Epidural Hematoma

epidural hematoma

Authors: Kilalo Maeli Mjema, Emergency Physician and Mugisha Clement, Neurosurgeon.

Case Presentation

A 34 years old male sustained a traumatic brain injury following a motor vehicle accident 3 hours before presentation to ED. BP: 117/69mmHg. HR: 84, RR: 18, SPO2: 99% in room air, T: 36.9.

Primary Survey

Airway: patent and protected
Breathing: bilateral equal air entry
Circulation: warm extremities, 1 second capillary refill time
Disability: alert and oriented, pupils 4mm bilaterally equally reactive to light, RBG 5.6 mmol/L
Exposure: raccoon right eye, bruises on the forehead and upper limbs

SAMPLE History

Signs and symptoms: mostly chest pain than the headache, nausea
Allergies: no known allergies
Medication: had received tramadol, dexamethasone, tetanus toxoid and some intravenous fluids before being referred to our facility
Past medical history: no known comorbid or any significant history
Event: sustained motor vehicle accident as a motorcycle driver with no helmet on 3 hours prior presentation, associated with a 20 minutes loss of consciousness. Attended at another facility where he regained his full consciousness, wounds dressed, medication given as above, E-FAST negative and CT imaging done. He remained conscious throughout and was transferred for neurosurgical observation and interventions.

Neuro-observation and continuous monitoring were planned. Blood samples sent for CBC, PT, aPTT, blood type and crossmatch. The neurosurgical review was done, and the patient was to be kept inpatient for close neurosurgical observation and interventions as needed.

Patient progress while still in the ED

In the course of stay in the ED, the patient started to vomit, became drowsier overtime, was moving mostly the right side of his limbs. The right pupil was 6-7mm non-reactive to light and GCS dropped to E1M4(Rt)V2

Vitals

BP 133/79 mmHg HR 39-45 bpm RR 14 rpm SPO2 99% in room air.

The patient was emergently transferred for repeat imaging and prepared for emergency craniotomy and hematoma evacuation. Theatre was informed and ready to receive the patient.

Rapid sequence induction and intubation 

  • Patient pre-oxygenated
  • Induction with iv ketamine 2mg/kg (weight 75kg)
  • Paralyzed with iv suxamethonium 100mg 
  • Intubated by sized 8 cuffed ETT

Mannitol 20g iv infusion was given over 10 minutes.

Intraoperative Findings and Progress

Right frontotemporoparietal craniotomy was done. Approximately 100 mls of hematoma because of spurting bleeding from the medial meningeal artery was found.  No other obvious identifiable bleeding was seen. Hemostasis was achieved and closed in layers with a drain. The patient had a complete neuro improvement, extubated at day 5 and discharged 9th day.

Clinical Pearls

  • The incidence of epidural hematoma is highest among adolescents and young adults
  • Most cases are a result of head trauma by traffic accidents, falls or assaults
  • Most commonly due to middle meningeal arterial bleed
  • Epidural hematoma does not cross suture margins but crosses dural attachments as a convex lens shaped appearance
  • Lucid intervals are seen in patients
  • Watch for raised intracranial pressure; ipsilateral dilated pupil, Cushing reflex, altered mentation, vomiting
  • Glucocorticoids have no role in reducing cerebral edema in traumatic brain injury
  • In the presence of epidural hematoma with the feature of herniation, mannitol can be given with caution that craniotomy and evacuation is going to be done immediately
  • Ketamine in RSII can still be considered in traumatic brain injury where blood pressures are not raised

Clinical Pearls

In the context of non-operative management, properly monitoring neurologic status and progress is the key factor to recognise early need of emergency medical intervention, re-imaging and neurosurgery.   

References and Further Reading

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