Why would a patient need a cardioversion?

Symptomatic arrhythm. Symptomatic arrhythmia, including vt, afib, aflutter, or even svt.
Rhythm disturbances. Cardioversion is an electronic technique used to convert an abnormal rhythm back to a normal one. The procedure is performed in a hospital under light anesthesia. Various rhythm disturbances such as atrial fibrillation and atrial flutter among others are treated with cardioversion. The results are usually successful and apparent immediately.