Estimation of mechanical heart valve cavitation in a pneumatic ventricular assist device.

Estimation of mechanical heart valve cavitation in a pneumatic ventricular assist device. Research Abstract Details 

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Estimation of mechanical heart valve cavitation in a pneumatic ventricular assist device. Abstract Text:

Hwansung Lee,Eiki Akagawa,Akihiko Homma,Tomonori Tsukiya,Eisuke Tatsumi,Yoshiyuki Taenaka,

In this study, we investigated the possibility of estimating the mechanical heart valve (MHV) cavitation intensity using the slope of the driving pressure (DP) just before valve closure in a pneumatic ventricular assist device. We installed a 23-mm Medtronic Hall valve at the inlet of our pneumatic ventricular assist device (VAD). Tests were conducted under physiologic pressures at heart rates ranging from 60 to 90 beats/min and cardiac outputs ranging from 4.5 to 6.7 l/min. The valve-closing velocity was measured with a CCD laster displacement sensor, and the images of MHV cavitation were recorded using a high-speed video camera. The cavitation cycle time (equal to the observed duration of the cavitation bubbles) was used as the MHV cavitation intensity. The valve-closing velocity increased as the heart rate increased. Most of the cavitation bubbles were observed near the valve stop, and the cavitation intensity increased as the heart rate increased. The slope of the DP at 20 ms before valve closure was used as an index of the cavitation intensity. There were differences in the slope of the DP between low and high heart rates, but the slope of the DP had a tendency to linearly increase with increasing valve-closing velocity.

Estimation of mechanical heart valve cavitation in a pneumatic ventricular assist device. Publishing Authors By Initials

H Lee,E Akagawa,A Homma,T Tsukiya,E Tatsumi,Y Taenaka,

For similar pathological conditions, signs and symptoms: pathologic processes: postoperative complications: prosthesis failure research abstracts see: pathological conditions, signs and symptoms: pathologic processes: postoperative complications: prosthesis failure research

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Estimation of mechanical heart valve cavitation in a pneumatic ventricular assist device. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of artificial organs : the official journa

VOLUME: 10

Page Numbers: 181-5

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ISSN: 1434-7229

DAY: 20

MONTH: 09

YEAR: 2007

Estimation of mechanical heart valve cavitation in a pneumatic ventricular assist device. Information

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LANGUAGE: eng

NlmUniqueID: 9815648

Estimation of mechanical heart valve cavitation in a pneumatic ventricular assist device. Keywords Mesh Terms:

KEYWORDS: Prosthesis Failure

MESH TERMS: adverse effects

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Grant and Affiliation Information for Estimation of mechanical heart valve cavitation in a pneumatic ventricular assist device.

AFFILIATION: Department of Artificial Organs, Research Institute, National Cardiovascular Center, 5-7-1 Fujishiro-dai, Suita 565-8565, Japan. hslee@ri.ncvc.go.jp

Country: Japan

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MEDLINETA: J Artif Organs

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