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[Comment] Supraventricular tachycardia: back to basics

In The Lancet, Andrew Appelboam and colleagues1 present the findings of a simple but clinically relevant investigation of a safe and non-invasive treatment for patients with stable supraventricular tachycardia who present to emergency departments. This topic is important because patients with supraventricular tachycardia are common, often recurrent, emergency department attenders, and can require critical care interventions. A Cochrane review2 did not find sufficient evidence to support or refute the effectiveness of the Valsalva manoeuvre to end supraventricular tachycardia.