Cardi, Luigi
April 1956
Angiology;Apr1956, Vol. 7 Issue 2, p171
Academic Journal
Experiments were performed in 15 dogs in order to study the effects of hypothermia on the heart. Death of 5 animals occurred. The results of 10 successful experiments are reported. The various changes of the electrocardiogram and phonocardiogram are analyzed. The most marked changes were those of rate (decrease of 400 per cent) and duration of ventricular systole (increase of 300 to 400 per cent). Electrical systole of the ventricles increased slightly less than mechanical systole. Conduction time, delay between Q and 1st sound, and duration of each heart sound, presented increases which were far less remarkable. A new ECG wave, which appeared in some of the experiments, is explained as the Ta wave which became visible.


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