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Ann Thorac Surg 1997;64:993-998
© 1997 The Society of Thoracic Surgeons
Division of Cardiothoracic Surgery, Department of Surgery, and Divisions of Cardiology and Biomedical Research, Department of Medicine, St. Elizabeth's Medical Center, Tufts University School of Medicine, Boston, Massachusetts
Background. Hypoxic endothelial cell activation plays a key role in the myocardial dysfunction resulting from ischemia-reperfusion injury. Recent evidence suggests that vascular endothelial growth factor (VEGF) may, in addition to promoting angiogenesis, modulate various aspects of endothelial function and repair. We examined whether administration of VEGF in the cardioplegic solution might have a beneficial effect on myocardial ischemia-reperfusion injury in an isolated rat heart model.
Methods. Hearts from Sprague-Dawley rats were perfused with Krebs-Henseleit solution in a modified Langendorff apparatus. Percent recovery of cardiac output, coronary flow, stroke work, and percent increase in coronary vascular resistance were measured after 2 hours of global ischemia and 40 minutes of reperfusion. Coronary effluent was collected after ischemia and reperfusion for measurement of creatine kinase.
Results. Hearts receiving cardioplegia solution containing 125 µg VEGF showed significantly improved recovery of cardiac output, coronary flow, and stroke work, and significantly reduced coronary vascular resistance compared with hearts receiving hyperkalemic cardioplegia only (p < 0.05). Coadministration of a nitric oxide synthase inhibitor attenuated the VEGF-induced cardiprotective effects. Hearts treated with VEGF released significantly less creatine kinase compared with control hearts.
Conclusions. Addition of VEGF to hyperkalemic cardioplegia protects against myocardial ischemia-reperfusion injury in the isolated rat heart.
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