الفهرس 
Introduction & Aim of The WorkOnly 14 pages are availabe for public view
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Abstract
This is a prospective randomized study that is conducted between January, 1994 and December, 1996, to evaluate the outcome of patients with isolated aortic valve replacement using two types of mechanical bileaflet heart valves (the CarboMedics ”CM” and the St. Jude Medical ”SJ” valves). Surgery was performed in the same institution (at the Toronto General Hospital, Toronto, Canada) by the same group of surgeons. Seventy one patients were included in the study. 38 patients (53.52%) in the CM group and 33 patients (46.58%) in the SJ group. There was no difference between the two groups as regards age and sex distribution, preoperative clinical status and functional class, left ventricular size and function, aortic valve pathology, or concomitant coronary artery disease. The mean age was 57 ± 11 years (range = 30- 74 years), there are 53 males (76.65%) and 18 females (25.35%). The mean body surface area was 1.95 ± 0.23 m2 (range = 1.30 to 2.40 nr’). There were 25 patients (65.79%) among the CM group, and 26 patients (78.79%) among the SJ group in NYHA class III and IV. The majority of patients, 35 (92.10%) in the CM group and 28 (84.85%) in the SJ . group, were found to have normal sinus rhythm. 46 patients (64.79%) were in grade I left ventricular systolic function . . Coronary angiogram revealed that 43 patients (60.56%) were found to have normal coronary arteries and 28 patients (39.45%) had variable coronary artery disease. The majority of patients (31 patients, 43.66%) had aortic stenosis, and had either calcified tricuspid aortic valve (22 patients, 30.99%) or congenitally bicuspid valve (24 patients, 33.8%). Most of the patients received either prosthesis size 25 mm (28 patients, 39.44%), or size 23 mm (17 patients, 23.94%). Aortic annular enlargement procedures were needed in 9 patients (12.68%), and coronary artery bypass was done in 28 patients (39.44%). Operative mortality occurred in one patient (1.4%) in the CM group and no operative mortality in the SJ group. There was no difference between both groups as regards the immediate postoperative complications.