title: Metabolic and histochemical benefits of regional blood cardioplegic reperfusion without cardiopulmonary bypass.
abstract: This study evaluates the capacity of regional substrate-enriched blood cardioplegic reperfusion (without bypass) to salvage cardiac muscle subjected to 40 minutes of regional ischemia. Results are compared with those obtained by normal blood reperfusion at either systemic or reduced perfusion pressure (i.e., simulating acute angioplasty or streptokinase thrombolysis). All studies were carried out in beating, working hearts when the conditions of reperfusion were not controlled. The results show that regional cardioplegic reperfusion without cardiopulmonary bypass reduces the incidence of perfusion ventricular fibrillation (15% versus 55%, p less than 0.05), increases recovery of subendocardial creatine phosphate (35.3 versus 14.0 mumol/gm, p less than 0.05) and adenosine triphosphate (6.0 versus 3.1 mumol/gm, p less than 0.05), reduces histochemical damage evaluated by triphenyltetrazolium chloride (0% versus 43% transmural nonstaining, p less than 0.05), and improves myocardial contractile reserve capacity (91% versus 41%, p less than 0.05). Normal blood reperfusion restored immediate systolic shortening in only 3 of 18 hearts (17%), and regional cardioplegic reperfusion without bypass produced early recovery of regional systolic shortening in only 10 of 16 hearts (63%, p greater than 0.05). Thus the value of controlling reperfusate composition without simultaneous control of reperfusion conditions is limited.
mesh_terms: D000818:Animals; D001224:Aspartic Acid / Q000494:pharmacology; D001769:Blood; D002118:Calcium / Q000494:pharmacology; D002315:Cardiopulmonary Bypass; D003326:Coronary Circulation / Q000187:drug effects*; D003327:Coronary Disease / Q000188:drug therapy* / Q000378:metabolism; D004285:Dogs; D005971:Glutamates / Q000494:pharmacology; D006324:Heart Arrest, Induced; D011189:Potassium Chloride / Q000494:pharmacology; D014325:Tromethamine / Q000494:pharmacology
chemical_list: D005971:Glutamates; D014325:Tromethamine; D001224:Aspartic Acid; D011189:Potassium Chloride; D002118:Calcium