CORONARY FLOW— BERNE 



169 



m< 



— 150 



—100 

 — 50 



' — 100 



A B 



C D 



ABC 



I 



n 



Fig. 5. — Aortic pressure curve (upper) and phasic coronary artery flow curve in the same 

 dog at 36° C. (I) and 23° C. (II). Systole from A-B in both records. Diastole B-C in record I 

 and B-D in record II. Aortic pressures in mm. Hg. Flow in ml. per minute. Time — 0.02-second 

 intervals. 



ventricles slowly relax. It is interesting to note that 66 per cent of the coronary 

 inflow occurs during isometric relaxation in hypothermia despite the decreasing 

 perfusion pressure and the prolonged period of extravascular compression. 



