title: Left ventricular function after preserving the heart for 2 hours at 15 degrees C.
abstract: Hearts preserved for 2 hours at 15 degrees C were evaluated for maximum function with the use of an isolated working dog heart subjected to stress. We determined left ventricular function by controlling aortic flow resistance and flow into the left atrium. Groups studied were hypothermia alone (H), hypothermia with a modified extracellular solution (H + DKS), hypothermia with a modified Collins solution (H + C), six periods of 20 minutes of hypoxic hypothermia followed by 10 minutes of blood reperfusion (H20 + R10) and blood cardiplegia (BC). Hypothermia alone for 1 hour was also evaluated. Functions were studied for 2 1/2 hours following reperfusion by determining Starling's curves for each heart. Our data show that H alone gave adequate myocardial protection for only 1 hour but not for 2 hours. H20 + R10 was better than H, but function was depressed. Use of H + C provided protection equal to H20 + R10, but the hearts recovered function slowly. Only hearts preserved by H + DKS and BC for 2 hours had normal function. Hearts from all groups except H + DKS and BC became edematous. Excellent function was obtained with DKS or BC following 2 hours of ischemia at 15 degrees C. Initial clinical use of BC supported these laboratory findings.
mesh_terms: D000818:Animals; D001794:Blood Pressure; D002302:Cardiac Output; D003326:Coronary Circulation; D004285:Dogs; D004573:Electrolytes / Q000378:metabolism; D006324:Heart Arrest, Induced; D007036:Hypothermia, Induced / Q000379:methods*; D009200:Myocardial Contraction; D009206:Myocardium / Q000378:metabolism; D010101:Oxygen Consumption; D010477:Perfusion; D014021:Tissue Preservation / Q000379:methods*
chemical_list: D004573:Electrolytes