Ultrasonic Closing Click of the Prosthetic Cardiac Valve

Jun HASEGAWA; Kenji KOBAYASHI; Hiroshi MATSUMOTO

Ultrasonic Closing Click of the Prosthetic Cardiac Valve

Jun HASEGAWA, Kenji KOBAYASHI, Hiroshi MATSUMOTO

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Mechanical prosthetic cardiac valves generate not only the widely recognized audible closing clicks but also ultrasonic closing clicks, as previously reported by us. A personal-computer-based measurement and analysis system with the bandwidth of 625 kHz has been developed to clarify the characteristics of these ultrasonic closing clicks. Fifty cases in total were assessed clinically, including cases with tilting disk valves, bileaflet valves, and flat disk valves. The ultrasonic closing clicks are damped vibrations continuing for about two milliseconds, and their frequency range was confirmed to be from 8 kHz to 625 kHz, while that of the audible click was up to 8 kHz. Although the sensitivity of the sensor decreased by approximately 30 dB at 625 kHz, effective power of the ultrasonic closing click was confirmed at this frequency. Moreover, it was shown that, surprisingly, the signal power at 625 kHz was still at the same level as that at around 100 kHz. Those wide bandwidth signal components exist independent of the type of mechanical valve, but the spectral pattern shows some dependence on the valve type.

Publication: IEICE TRANSACTIONS on Information Vol.E81-D No.12 pp.1517-1521

Publication Date: 1998/12/25

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Category: Bio-Cybernetics and Neurocomputing

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Jun HASEGAWA, Kenji KOBAYASHI, Hiroshi MATSUMOTO, "Ultrasonic Closing Click of the Prosthetic Cardiac Valve" in IEICE TRANSACTIONS on Information, vol. E81-D, no. 12, pp. 1517-1521, December 1998, doi: .
Abstract: Mechanical prosthetic cardiac valves generate not only the widely recognized audible closing clicks but also ultrasonic closing clicks, as previously reported by us. A personal-computer-based measurement and analysis system with the bandwidth of 625 kHz has been developed to clarify the characteristics of these ultrasonic closing clicks. Fifty cases in total were assessed clinically, including cases with tilting disk valves, bileaflet valves, and flat disk valves. The ultrasonic closing clicks are damped vibrations continuing for about two milliseconds, and their frequency range was confirmed to be from 8 kHz to 625 kHz, while that of the audible click was up to 8 kHz. Although the sensitivity of the sensor decreased by approximately 30 dB at 625 kHz, effective power of the ultrasonic closing click was confirmed at this frequency. Moreover, it was shown that, surprisingly, the signal power at 625 kHz was still at the same level as that at around 100 kHz. Those wide bandwidth signal components exist independent of the type of mechanical valve, but the spectral pattern shows some dependence on the valve type.
URL: https://globals.ieice.org/en_transactions/information/10.1587/e81-d_12_1517/_p

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@ARTICLE{e81-d_12_1517,
author={Jun HASEGAWA, Kenji KOBAYASHI, Hiroshi MATSUMOTO, },
journal={IEICE TRANSACTIONS on Information},
title={Ultrasonic Closing Click of the Prosthetic Cardiac Valve},
year={1998},
volume={E81-D},
number={12},
pages={1517-1521},
abstract={Mechanical prosthetic cardiac valves generate not only the widely recognized audible closing clicks but also ultrasonic closing clicks, as previously reported by us. A personal-computer-based measurement and analysis system with the bandwidth of 625 kHz has been developed to clarify the characteristics of these ultrasonic closing clicks. Fifty cases in total were assessed clinically, including cases with tilting disk valves, bileaflet valves, and flat disk valves. The ultrasonic closing clicks are damped vibrations continuing for about two milliseconds, and their frequency range was confirmed to be from 8 kHz to 625 kHz, while that of the audible click was up to 8 kHz. Although the sensitivity of the sensor decreased by approximately 30 dB at 625 kHz, effective power of the ultrasonic closing click was confirmed at this frequency. Moreover, it was shown that, surprisingly, the signal power at 625 kHz was still at the same level as that at around 100 kHz. Those wide bandwidth signal components exist independent of the type of mechanical valve, but the spectral pattern shows some dependence on the valve type.},
keywords={},
doi={},
ISSN={},
month={December},}

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TY - JOUR
TI - Ultrasonic Closing Click of the Prosthetic Cardiac Valve
T2 - IEICE TRANSACTIONS on Information
SP - 1517
EP - 1521
AU - Jun HASEGAWA
AU - Kenji KOBAYASHI
AU - Hiroshi MATSUMOTO
PY - 1998
DO -
JO - IEICE TRANSACTIONS on Information
SN -
VL - E81-D
IS - 12
JA - IEICE TRANSACTIONS on Information
Y1 - December 1998
AB - Mechanical prosthetic cardiac valves generate not only the widely recognized audible closing clicks but also ultrasonic closing clicks, as previously reported by us. A personal-computer-based measurement and analysis system with the bandwidth of 625 kHz has been developed to clarify the characteristics of these ultrasonic closing clicks. Fifty cases in total were assessed clinically, including cases with tilting disk valves, bileaflet valves, and flat disk valves. The ultrasonic closing clicks are damped vibrations continuing for about two milliseconds, and their frequency range was confirmed to be from 8 kHz to 625 kHz, while that of the audible click was up to 8 kHz. Although the sensitivity of the sensor decreased by approximately 30 dB at 625 kHz, effective power of the ultrasonic closing click was confirmed at this frequency. Moreover, it was shown that, surprisingly, the signal power at 625 kHz was still at the same level as that at around 100 kHz. Those wide bandwidth signal components exist independent of the type of mechanical valve, but the spectral pattern shows some dependence on the valve type.
ER -