346 



PHYSIOLOGY OF INDUCED HYPOTHERMIA 



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NORMAL RHYTHM 

 • FIBRILLATION 



M. DEFIBRILLATION 



1 IMPOSSIBL E 



22 24 26 28 



BODY TEMPERATURE 



30 



32 



Fig. 2. — Duration of aortic and pulmonary occlusion in hypothermic dogs during by-pass of 



heart and lungs. 



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CONTROL 



• • • 



5 10 15 20 MINUTES 



DURATION OF AORTIC OCCLUSION 

 Fig. 3. — Mean per cent change in luart rate (if hypothermic dogs during l)y-pass of heart and 

 lungs, aorta and pulmonary artery occluded. 



