Abstract
Summary
Adult cats were cooled by packing in ice until cardiac failure occurred. Asystole was the most frequent cause of death. The decreased heart rate observed under hypothermia was primarily due to a lengthening of the Q-T interval. Systolic and diastolic blood pressure decreased when body temperature reached 30°C. There was no change in amplitude of the R-wave of the ECG. The T-wave was upright in the control record and became inverted as cooling progressed. The temperature of the first appearance of the H-wave, which was present in each experiment, coincided with the temperature at which the T-wave became inverted.
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