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Exercise echocardiography in cryopreserved aortic homografts: comparison of a prototype stentless, a stented bioprosthesis, and native aortic valves. | LitMetric
Background : Aortic valve replacement with a cryopreserved aortic homograft (CH) is an attractive alternative to bioprosthesis implantation. The aim of the study was to compare the hemodynamic performance of CH implanted with aortic root inclusion compared to prototype stentless (SS) bioprosthesis, standard stented (SD) bioprosthesis, and a native aortic valve.Methods : Hemodynamics and Doppler echocardiographic measurements such as left ventricular ejection fraction, aortic valve orifice area index (AVOAI), mean and maximal transvalvular gradients, were obtained at rest and immediately after exercise in 28 patients after aortic valve replacement with CH (n = 10), SS (n = 9), or SD (n = 9), and in a control group (CG) of 15 normal volunteers.Results : Rest and peak exercise heart rate and workload achieved were not different among the groups. Baseline AVOAI was larger for CH and CG compared to SS and SD groups (P < 0.05). Maximal and mean transvalvular pressure gradients at rest were lower for CH compared to SS and SD groups (P < 0.05), but higher than CG (P < 0,05).Conclusion : Implanted aortic CH had better hemodynamic performance than SS and SD bioprosthesis and similar to native normal aortic valves, both at rest and immediately after exercise.
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