Which condition is treated with a high-energy shock during defibrillation?

Defibrillation is a critical intervention used in cases where the heart is experiencing life-threatening arrhythmias, particularly when there is no effective heartbeat or pulse present. Pulseless ventricular tachycardia (Vtach) is characterized by a rapid heart rate originating from the ventricles without effective contractions leading to blood circulation, resulting in a lack of pulse.

The high-energy shock delivered during defibrillation aims to reset the electrical activity of the heart. By disrupting the chaotic electrical impulses, defibrillation can help restore a normal rhythm and potentially re-establish an adequate cardiac output. This emergency measure is essential because pulseless Vtach can rapidly progress to more severe cardiac issues, including ventricular fibrillation, leading to sudden cardiac arrest if not addressed promptly.

In contrast, other arrhythmias listed, such as atrial flutter and stable supraventricular tachycardia (SVT), may require different treatment approaches, such as cardioversion or medications, rather than the high-energy shocks that defibrillation involves.