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Ann Thorac Surg 1991;52:1026-1032
© 1991 The Society of Thoracic Surgeons
Division of Cardiovascular and Thoracic Surgery, Department of Surgery, University of British Columbia and Vancouver General Hospital, Vancouver, British Columbia, Canada
* Address reprint requests to Dr Qayumi, Department of Surgery, Room 3100-910 West 10th Ave, Vancouver, BC, V5Z 4E3 Canada.
The preservation of heart and lung for transplantation remains a major concern in extended ischemic intervals. This experiment evaluated the effect of high molecular weight deferoxamine and a platelet-activating factor antagonist (CV-3988) in ischemic reperfused tissue. Heart-lung transplantation was performed in a swine model after 4 hours 45 minutes of ischemia. Animals were divided into three groups. Group A was a control without pharmacological intervention. In group B, high molecular weight deferoxamine, 50 mg/kg, was used, and in group C, platelet-activating factor antagonist CV-3988, 10 mg/kg, was used. The results of functional variables (cardiac index, stroke index, lung water, oxygen and carbon dioxide tensions, alveolar-arterial gradient, and alveolar-arterial ratio) demonstrated superior heart and lung function for groups B and C compared with the control group. These alterations of heart and lung function were significantly less (p < 0.001) in group C, in which the platelet-activating factor antagonist (CV-3988) was used. The study revealed that formation of hydroxyl radicals and platelet-activating factor play an important role in the pathogenesis of ischemia reperfusion injury. Prevention of hydroxyl radical formation with high molecular weight deferoxamine and inactivation of platelet-activating factor with CV-3988 reduce the ischemia-reperfusion injury significantly.
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