Hemodynamic assessment of Carbomedics bileaflet heart valves by ultrasound: Studies in the aortic and mitral positions

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题名:	Hemodynamic assessment of Carbomedics bileaflet heart valves by ultrasound: Studies in the aortic and mitral positions
作者:	Cape,EG;Sung,HW;Yoganathan,AP
贡献者:	化學工程與材料工程學系
关键词:	SHEAR-STRESS MEASUREMENTS;INVITRO VELOCITY;VICINITY;PROSTHESES
日期:	1996
上传时间:	2010-06-29 17:32:09 (UTC+8)
出版者:	中央大學
摘要:	The bileaflet mechanical heart valve has become a]popular prosthesis for implantation in both the aortic and mitral positions and a recent design by Carbomedics has received widespread use, Noninvasive assessment of these valves by Doppler ultrasound is important in characterizing their normal performance and in assessing the course of dysfunction. This study addressed the hypothesis that Doppler predicted pressure drops will correlate with catheter pressure drops within a valve size and position, A subhypothesis is that the pressure drops agree, and we expect this subhypothesis to fail due to pressure recovery effects, In a well-controlled in vitro model it was shown that the combined effects of pressure recovery and neglecting proximal velocities resulted in overestimation of catheter pressure drops for Carbomedics bileaflet valves, Inclusion of the proximal velocity reduced overestimation of peak pressure drops for aortic and mitral valves to clinically acceptable levels, and removed overestimation of mean pressure drops, Without correction for proximal velocity, overestimation of mitral pressure drops was reduced to 3.32% when means were calculated, but mean aortic pressure drops still overestimated the catheter standard significantly, It is concluded that proximal velocities should be included in Bernoulli analysis of Carbomedics heart valves, If the proximal velocity is not available, mitral valves may be best assessed using mean pressure drops, while aortic valve Doppler data, peak or mean, should be interpreted with caution.
關聯:	ULTRASOUND IN MEDICINE AND BIOLOGY
显示于类别:	[化學工程與材料工程研究所] 期刊論文

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