Cardioversion is a procedure which restores the heart beat to a normal rhythm. 

This involves a controlled electrical shock which is delivered to the heart through paddles or patches (electrodes) attached to your chest and connected to a defibrillator. The electrical current passes through the heart muscle and restores the heart beat to a normal, controlled rhythm. 

Most cardioversions are performed to treat an irregular heart beat such as atrial fibrillation, atrial flutter and atrial tachycardia.

This procedure takes approximately 30 minutes to perform. You will not be awake while the procedure is taking place. You should expect to be in the hospital for 2-3 hours prior to the procedure. You will be monitored closely afterwards and usually discharged on the same day, once your condition is stable.