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Ann Thorac Surg 2002;73:582-587
© 2002 The Society of Thoracic Surgeons
a Cardiac Technology Centre, Department of Cardiology, Royal North Shore Hospital, Sydney, Australia
Accepted for publication September 15, 2001.
* Address reprint requests to Dr Ramanathan, c/o Prof Stephen Hunyor, Cardiac Technology Centre, Block 4, Level 3, Royal North Shore Hospital, St. Leonards, Sydney, NSW 2065, Australia
e-mail: indranrama{at}yahoo.com
Background. The mechanism by which glucose-insulin-potassium solutions enhance recovery of left ventricular function after myocardial ischemia in diabetic patients is not well understood. We evaluated the effect of glucose-insulin-potassium on ventriculoarterial coupling and left ventricular mechanics in a chronic ovine model of diabetes.
Methods. Diabetes was induced in 6 sheep with streptozotocin. After 6 months of diabetes, the response of the left ventricular pressure-volume relationship to 60 minutes of intravenous glucose-insulin-potassium solution (1,000 mL of 5% dextrose in water, 100 IU of regular insulin, 90 mmol of KCl at 1.5 mL · kg-1 · h-1) was determined.
Results. Glucose-insulin-potassium solution increased end-systolic elastance 68% (p = 0.01) and improved ventriculoarterial coupling (1.7 ± 0.3 to 1.0 ± 0.1; p < 0.01). Potential energy decreased 35% (p = 0.01), and pressure-volume area decreased 20% (p = 0.01). However, stroke work did not change; therefore stroke work efficiency increased from 50.1% ± 3.5% to 60.2% ± 5.1% (p = 0.01).
Conclusions. Glucose-insulin-potassium solution improves left ventricular contractility and ventriculoarterial coupling in diabetes. Left ventricular mechanics is improved by decreasing total mechanical work without significantly affecting stroke work, resulting in improved stroke work efficiency. Improved efficiency facilitates understanding of the enhanced tolerance to myocardial ischemia afforded by glucose-insulin-potassium solution.
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Ann. Thorac. Surg. 2002 73: 587.
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