The term “supraventricular tachycardia (SVT)” expresses all kinds of rhythms that meet two criteria: Firstly, the atrial rate must be faster than 100 beats per minute at rest. Secondly, the mechanism must involve tissue from the His bundle or above. Mechanism-wise, atrial fibrillation resembles SVTs. However, supraventricular tachycardia traditionally represents tachycardias apart from ventricular tachycardias (VTs) and atrial fibrillation (1,2).
Supraventricular tachycardias are frequent in the ED!
The SVT prevalence is 2.25 per 1000 persons. Women and adults older than 65 years have a higher risk of developing SVT! SVT-related symptoms include palpitations, fatigue, lightheadedness, chest discomfort, dyspnea, and altered consciousness.
How to manage supraventricular tachycardia?
In clinical practice, SVTs are likely to present as narrow regular complex tachycardias. Concomitant abduction abnormalities may cause SVTs to manifest as wide complex tachycardias or irregular rhythms. However, 80% of wide complex tachycardias are VTs. Most importantly, SVT drugs may be harmful to patients with VTs. Therefore, wide complex tachycardias should be treated as VT until proven otherwise (1,2).
The chart below summarizes acute management of regular narrow complex tachycardias:
References and Further Reading
- Brugada, J., Katritsis, D. G., Arbelo, E., Arribas, F., Bax, J. J., Blomström-Lundqvist, C., … & Gomez-Doblas, J. J. (2019). 2019 ESC Guidelines for the management of patients with supraventricular tachycardia: the Task Force for the management of patients with supraventricular tachycardia of the European Society of Cardiology (ESC). European Heart Journal, 00, 1-66.
- Page, R. L., Joglar, J. A., Caldwell, M. A., Calkins, H., Conti, J. B., Deal, B. J., … & Indik, J. H. (2016). 2015 ACC/AHA/HRS guideline for the management of adult patients with supraventricular tachycardia: a report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines and the Heart Rhythm Society. Journal of the American College of Cardiology, 67(13), e27-e115.