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Isolated perfused paced hearts from rats rendered hypothyroid by chronic administration of propylthiouracil have a delayed onset of ischemia-induced myocardial contracture in contrast to hearts from control rats. In addition, the time to reach maximum contracture is delayed, and the magnitude of the contracture pressure is reduced. Preischemia myocardial adenosine triphosphate (ATP) values in the hypothyroid rat hearts are similar to those of control, but the rate of decrease in ATP is slower in the hearts of hypothyroid rats. Thus, it appears that in the hypothyroid state the development of ischemic contracture is associated with a slower fall of ATP.
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