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cardioversion (kahrŽde-o-vur″zhәn)   the delivery of a direct current countershock synchronized with the QRS complex to the myocardium in order to end tachydysrhythmias and restore sinoatrial control of the heart rhythm through depolarization of the entire myocardium. The depolarization interrupts reentry circuits, thus ending myocardial fibrillation and some other types of dysrhythmias. The electric shock can be delivered directly to the myocardium in an open chest procedure, or through externally applied paddles placed on the chest.




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