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Ann Thorac Surg 1994;58:429-432
© 1994 The Society of Thoracic Surgeons

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Articles

Infective endocarditis in patients who had replacement of the aortic root

Division of Cardiovascular Surgery, The Toronto Hospital and the University of Toronto, Toronto, Ontario, Canada

Accepted for publication December 2, 1993.

^_* Address reprint requests to Dr David, Toronto General Hospital 200 Elizabeth St, 13 EN-219, Toronto, Ont M5G 2C4, Canada.

In 12 patients who had had composite replacement of the aortic valve and ascending aorta, infective endocarditis developed 2 months to 17 years after operation. Six patients had mechanical valves and 6 had biological ones (four homograft and two porcine valves). All patients needed operation because of shock, heart failure, persistent sepsis in spite of adequate antibiotic therapy, or the development of a paravalvular false aneurysm. The predominant microorganism was Staphylocaccus. All 6 patients who had mechanical valves were found to have an abscess in the junction between the aortic annulus and the prosthesis; in patients who had biological valves the infection was limited to the leaflets in 3 (one homograft and two porcine valves) and leaflets and annulus abscess in 3 (three homograft valves). Operation consisted of radical resection of tissues suspected of being infected and reconstruction of the left ventricular outflow tract and of the surrounding structures with glutaraldehydefixed bovine pericardium. The aortic valve and ascending aorta were replaced with a new valved conduit. An aortic homograft was used in only 1 patient. There was only one operative death due to right ventricular infarction but most patients experienced serious postoperative complications. Operative survivors were followed up from 3 to 156 months (mean, 42 months). One patient died 35 months postoperatively due to bleeding complications of anticoagulation; 1 patient suffered a cardiac arrest at home 2 months after operation, sustained permanent cerebral damage, and died 4 months later. The remaining patients are asymptomatic from the cardiovascular viewpoint There has been no recurrent infection or formation of false aneurysm.

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