Document Detail


Characteristics of cavitation intensity in a mechanical heart valve using a pulsatile device: synchronized analysis between visual images and pressure signals.
MedLine Citation:
PMID:  18604610     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To investigate the characteristics of cavitation intensity, we performed a synchronized analysis of the visual images of cavitation and the pressure signals using a pulsatile device. The pulsatile device employed was a pneumatic ventricular assist device (PVAD) that is currently being developed by our group. A 23-mm Medtronic Hall valve (M-H valve) and a 23-mm Sorin Bicarbon bileaflet valve (S-B valve) were mounted in the inlet port of the PVAD after the sewing ring had been removed. A function generator provided a square signal, which was used as the trigger signal, via Electrocardiogram R wave (ECG-R) mode, of the control - drive console for circulatory support. The square signal was also used, after a suitable delay, to synchronize operation of a pressure sensor and a high-speed video camera. The data were stored using a digital oscilloscope at a 1-MHz sampling rate, and then the pressure signal was band-pass filtered between 35 and 200 kHz using a digital filter. The valve-closing velocity, visual cavitation time, and root mean square (RMS) pressure of the M-H valve were greater than those of the S-B valve. Both the visual cavitation time and RMS pressure represent the cavitation intensity, and this is a very important factor when estimating mechanical heart valve cavitation intensity in an artificial heart.
Authors:
Hwansung Lee; Eiki Akagawa; Eisuke Tatsumi; Yoshiyuki Taenaka
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-07-06
Journal Detail:
Title:  Journal of artificial organs : the official journal of the Japanese Society for Artificial Organs     Volume:  11     ISSN:  1434-7229     ISO Abbreviation:  J Artif Organs     Publication Date:  2008  
Date Detail:
Created Date:  2008-07-08     Completed Date:  2008-10-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9815648     Medline TA:  J Artif Organs     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  60-6     Citation Subset:  IM    
Affiliation:
Department of Artificial Organs, Research Institute, National Cardiovascular Center, 5-7-1 Fujishiro-dai, Suita, 565-8565, Japan. hslee@ri.ncvc.go.jp
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MeSH Terms
Descriptor/Qualifier:
Electrocardiography
Heart Valve Prosthesis*
Heart-Assist Devices
Pressure
Video Recording

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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