Abstract
The effect of direct current countershock on the myocardium in 10 patients undergoing elective cardioversion was evaluated utilizing 99m Tc Pyrophosphate imaging and MB CPK isoenzyme estimations. No perfusion abnormality or elevation of MB CPK occurred. The cumulative energy required for cardioversion ranged from 200–800 w/sec. It is concluded that myocardial injury or necrosis does not develop within these energy settings.
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