Abstract
Summary
Electrical alternation developed in 8 of 9 dogs (89%) which survived coronary artery occlusion and showed electrocardio-graphic signs of myocardial ischemia. Electrical alternation occurred within 2 to 3 minutes after occlusion and was transient. Repeated temporary occlusions predisposed to the development of electrical alternation.
Alternation was predominantly of the ST-T complex, although less marked alternation of the QRS complex and of the T wave also occurred.
It is postulated that in our experiments, electrical alternation of injury effects is due to the failure of certain fractions of ischemic myocardium to respond on alternate beats.
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