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Cardioversion is done to restore a normal heart rhythm for people who have certain types of arrhythmias. During cardioversion a special machine is used to send electrical energy to the heart muscle to restore normal rhythm, allowing the heart to pump more effectively. A nurse or technician places several large patches called electrodes on your chest which is connected to a cardioversion machine using wires. The machine records your heart rhythm throughout the procedure and will deliver shocks to restore a normal heart rhythm. Cardioversion is used to treat many types of fast or irregular heart rhythms like atrial fibrillation or atrial flutter. Both Cardioversion and defibrillation procedures use a device to deliver an electrical shock to the heart but electrical cardioversion uses much lower electricity levels to give the shock than defibrillation and defibrillation is used to treat much more difficult cases of arrhythmias.