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Ann Thorac Surg 1978;26:515-524
© 1978 The Society of Thoracic Surgeons

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Articles

Reduction of Intraoperative Myocardial Infarction by Means of Exogenous Anaerobic Substrate Enhancement: Prospective Randomized Study

Marshfield Clinic and Marshfield Medical Foundation, Marshfield, WI.

^* Address reprint requests to Dr. Lolley, Marshfield Clinic, 1000 N Oak Ave, Marshfield, WI 54449.

In a prospective study, patients who had an ejection fraction of 40% or more and who were undergoing elective coronary artery operation were randomly divided into three groups that differed in the method of anaerobic substrate enhancement during cardiopulmonary bypass. Group 1, the controls (n = 157), received no additional glucose, insulin, and potassium solutions and experienced immediate spontaneous defibrillation (10%), transmural myocardial infarction (10.3%), malignant ventricular arrhythmias (26%), and severe atrial arrhythmias (20%). Group 2 (n = 120) received a bolus of hypertonic glucose, insulin, and potassium in the pump perfusate before aortic cross-clamping. In this group, the rate of spontaneous defibrillation was 41%, of transmural infarction, 8.3%, of malignant ventricular arrhythmias, 31%, and of severe atrial arrhythmias, 19%. Group 3 (n = 114) had the aortic root continuously infused with glucose, insulin, and potassium solution at 4° during aortic cross-clamping. This group was significantly improved; the rate of spontaneous defibrillation was 60%, there were no transmural myocardial infarctions and the incidence of severe atrial arrhythmias was 6% and that of malignant ventricular arrhythmias, 5%. It is proposed that the superior clinical results in Group 3 resulted from better myocardial preservation achieved by more efficient means of providing continuous anaerobic substrate, coronary washout, and elution of lactic acidosis, uniform global hypothermia, and direct supplemental myocardial potassium in addition to mere cardioplegic effects.

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