Abstract
Continuous blood cardioplegic method was employed after placing the aortic cross clamp. Pouring cold blood, Coronary perfusion pressure and coronary resistance are effected by sludging of red blood cells and viscosity of cold blood. Quantitative analysis of coronary perfusion pressure and resistance was assessed in 5 patients with mitral stenosis. The patients had no aortic valve disease and no signficant stenosis of coronary arteries, Coronary perfusion systemwas used to record the aortic root pressure. Temperature of cardioplegic solution was 3C Perfusion pressure was ranged 100 to 120mmHg at pump. Myocardial temper-ature was less than 5C. Perfusion pressure and flow were measured 17 times, (GIK: 6, cold blood: 11) Results were as follows. Aortic root pressure was less than 40mmHg in each cases. Perfusion flow was decreased in the case pouring cold blood, and coronary resistance was increased when pouring cold blood. Coronary resistance was defined as MEAN AORTIC PRESSURE/MEAN FLOW.
Mean coronary resistance were 95.8 of GIK, 144.4 of cold blood, By these results, it was presumed that 660 of coronary vascular area is perfused with cold blood compared with GIK solution, because of sludging of red blood cells and visco-sity of blood.
