In cardioversion, what is the goal of delivering a synchronized shock?

Delivering a synchronized shock during cardioversion specifically aims to restore normal sinus rhythm in the heart. Atrial fibrillation leads to irregular and often rapid heartbeats, which can cause inefficient heart function and a variety of symptoms such as palpitations and fatigue. Synchronized cardioversion is performed to deliver an electrical shock that aligns with the heart's electrical system, specifically targeting the depolarization of the atria in a way that allows for the reestablishment of a coordinated and rhythmic heartbeat. This synchronized approach is crucial because it minimizes the risk of inducing ventricular fibrillation, which can occur if the shock is delivered at the wrong phase of the cardiac cycle. The success of this procedure is measured by the restoration of a normal rhythm, which is paramount for improving the patient's overall cardiac output and symptoms.

Other choices do not accurately represent the primary intent of cardioversion. While managing heart rate and addressing cardiomyopathy are relevant to overall cardiac care, they do not directly relate to the specific goal of delivering a synchronized shock, which is to revert the heart back to a normal sinus rhythm. Reducing the size of the heart, often a consideration in chronic heart conditions or heart failure, is not an aim of cardioversion itself.