Time-related hemodynamic changes after aortic replacement with the freestyle stentless xenograft

被引:63
作者
Westaby, S [1 ]
Amarasena, N [1 ]
Long, V [1 ]
Prothero, A [1 ]
Amarasena, GAC [1 ]
Banning, AP [1 ]
Pillai, R [1 ]
Ormerod, O [1 ]
机构
[1] JOHN RADCLIFFE HOSP, OXFORD HEART CTR, DEPT CARDIOL, OXFORD OX3 9DU, ENGLAND
关键词
D O I
10.1016/0003-4975(95)00639-7
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Background. The Freestyle valve is a porcine aortic root fixed with net zero pressure across the cusps and treated with the anticalcification agent alpha-aminooleic acid. We evaluated the hemodynamic function of this stentless valve. Methods. We implanted the valve into 80 consecutive patients scheduled to receive a bioprosthesis. Sixty-nine patients were more than 70 years old and 14 had calcified aortic sinuses. The ''cylinder within a cylinder'' implantation technique was used. Twenty-seven patients received coronary grafts, and 3 had mitral repair. All patients were studied echocardiographically during week 1 and 41 were studied at 6 months. Results. Median ischemic time for isolated aortic valve replacement was 44 minutes. There were four hospital deaths, none valve related. No patient had more than trivial aortic regurgitation. Mean systolic gradients for valve sizes 21 to 25 mm fell significantly with time (p less than or equal to 0.05) due to remodeling of the porcine root and early regression of left ventricular hypertrophy. Late hemodynamic function was equivalent to an aortic homograft. Conclusions. The Freestyle valve is easily implanted and has excellent hemodynamics. Transvalvular gradients decrease progressively.
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收藏
页码:1633 / 1638
页数:6
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