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The Journal of Thoracic and Cardiovascular Surgery, Vol 104, 1618-1624, Copyright © 1992 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Endothelial dysfunction caused by University of Wisconsin preservation solution in the rat heart. The importance of temperature

P Mankad, Z Slavik and M Yacoub
Department of Cardio-Thoracic Surgery, National Heart and Lung Institute, London, U.K.

The superiority of the University of Wisconsin solution over routinely used crystalloid cardioplegic solutions for myocardial preservation has been demonstrated in animal studies. We have investigated the effect of the University of Wisconsin solution at different temperatures on endothelial function by examining its influence on 5-hydroxytryptamine- and nitroglycerin-induced increase in coronary flow in the isolated rat heart. Thirty-eight rat hearts were perfused on a modified Langendorff preparation. In the control experiments, there was no significant difference in the percentage increase in coronary flow induced by 5- hydroxytryptamine and nitroglycerin after 30 minutes of perfusion with Krebs-Henseleit buffer (n = 6). Continuous infusion of the University of Wisconsin solution for 30 minutes at 4 degrees C or at 10 degrees C did not alter the 5-hydroxytryptamine or nitroglycerin response. However, infusion at 15 degrees C reduced the 5-hydroxytryptamine- induced vasodilation, while at 20 degrees C the 5-hydroxytryptamine response was converted to vasoconstriction without a significant change in nitroglycerin effect (15 degrees C, 5-hydroxytryptamine, before: 30.2% +/- 1.5%, after: 6.0% +/- 1.0%, nitroglycerin, before: 28.8% +/- 1.3%, after: 31.2% +/- 1.8%; 20 degrees C, 5-hydroxytryptamine, before: 32.2% +/- 2.5%, after: -23.8% +/- 3.6%, nitroglycerin, before: 30.3% +/- 1.9%, after: 33.5% +/- 1.7%). Coronary vascular resistance in the control experiments rose from 55.0 +/- 2.5 cm H2O/ml/gm/min to 58.4 +/- 2.3 cm H2O/ml/gm/min (p = not significant). The increase after University of Wisconsin solution infusion at 4 degrees C and at 10 degrees C was similarly not significant. Coronary vascular resistance increased significantly following infusion of University of Wisconsin solution at 15 degrees C (p < 0.001) or at 20 degrees C (p < 0.01). We conclude that University of Wisconsin solution produces temperature- dependent endothelial dysfunction in the isolated rat heart.

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