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Ann Thorac Surg 1995;60:411-416
© 1995 The Society of Thoracic Surgeons

Original Articles: Cardiovascular

Limiting Ischemic Myocardial Damage Using Glucose-Insulin-Potassium Solutions

Harold L. Lazar, MD, X. Zhang, MD, Samuel Rivers, BS, Sheilah Bernard, MD, Richard J. Shemin, MD

Department of Cardiothoracic Surgery, The Boston University Hospital, Boston, Massachusetts

Accepted for publication April 7, 1995.

Background. This experimental study sought to determine whether the infusion of glucose-insulin-potassium (GIK) solutions to ischemic myocardium during revascularization would decrease myocardial damage.

Methods. In 40 pigs, the second and third diagonal vessels were occluded with snares for 90 minutes followed by 30 minutes of cardioplegic arrest and 180 minutes of reperfusion. During the periods of coronary occlusion and reperfusion, 10 pigs received GIK (glucose = 300 g/L, insulin = 50 U/L, K+ = 80 mEq/L) through the jugular vein at 1 mL • kg-1 • h-1 (GIK-IV group); 10 pigs received GIK through the coronary sinus (GIK-CS group); 5 pigs received GIK through the jugular vein during reperfusion only (GIK-R group); 5 pigs received GIK through the jugular vein 2 hours prior to coronary occlusion and then during the periods of coronary occlusion and reperfusion (GIK-Pre group); and 10 pigs received no GIK (Unmodified group). Ischemic damage was assessed by wall motion scores using two-dimensional echocardiography, changes in myocardial tissue pH, and the area of necrosis in the area of risk.

Results. Hearts treated with GIK had significantly less tissue acidosis, higher wall motion scores, and the least tissue necrosis (14% +/- 2% GIK-Pre versus 12% +/- 2% GIK-CS versus 16% +/- 2% GIK-IV versus 25% +/- 2% GIK-R versus 73% +/- 4% Unmodified; all, p < 0.05 versus Unmodified).

Conclusions. We conclude that a glucose-insulin-potassium solution reduces ischemic myocardial damage during coronary revascularization.




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