Potential Changes in the Heart Caused by Cooling

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Abstract
Re-stricted areas on the ventricles of the dog were cooled in situ at temperatures from 1 to 15[degree]C and semidirect electrograms were recorded. Cooling a restricted zone of the myocardium slows recovery, and impairs conduction into the cooled zone. If continued long enough it causes a reversible diastolic depolarization of the cooled area. Depending upon circumstances, each of these 3 factors may be responsible for the appearance of S-T segment displacement. The depolarization caused by cold and the delay in repolarization that also occurs are antagonized by the heart beat or processes initiated thereby, so that the ecg changes they produce are minimized while the heart beats, and are intensified when the heart slows or stops.

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