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Aspirin and Dipyridamole Inhibit Endothelial Healing
Richard A. Bomberger, MD;
Ralph G. DePalma, MD;
Thomas A. Ambrose;
Pacita Manalo, MD
Arch Surg. 1982;117(11):1459-1464.
Abstract
• Aspirin and dipyridamole have been used to treat the thromboembolic complications of atherosclerosis. We studied the effects of these drugs on the rate of endothelial healing after a standard de-endothelializing injury of the thoracic aorta. Twenty-five rabbits received 13.5 mg/kg/day of aspirin and 15 mg/kg/day of dipyridamole one week before injury and for the period of endothelial regrowth. There were 25 control animals. Mean serum aspirin salicylate levels were 12 µg/dL at the time of injury and 15 µg/dL at death. Areas of endothelial regrowth were measured by Evans blue dye at 1, 4, 7, and 14 days after injury. The percentage of endothelial regrowth was measured by computor-assisted morphometry. Antiplatelet treatment retarded endothelial regrowth by 66% at four days, 22% at seven days, and 28% at 14 days. Antiplatelet drugs must be used cautiously, as re-endothelialization of injured arteries Is retarded.
(Arch Surg 1982;117:1459-1464)
Author Affiliations
From the Departments of Surgery (Drs Bomberger and DePalma) and Pathology (Dr Manalo), University of Nevada School of Medicine, Reno, and the Ohio State University Medical School, Columbus (Mr Ambrose).
Footnotes
Accepted for publication July 19, 1982.
Read before the 30th scientific meeting of the International Cardiovascular Society, Boston, June 18, 1982.
Reprint requests to Department of Surgery, University of Nevada School of Medicine, 855 Mill St, Reno, NV 89502 (Dr Bomberger).
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