CARDIAC DIAGNOSING BY A PIEZOELECTRIC-TRANSDUCER-BASED HEART SOUND MONITOR SYSTEM

Shinichi Sato, Takashi Koyama, Kyoichi Ono, Gen Igarashi, Hiroyuki Watanabe, Hiroshi Ito, Mikio Muraoka

Abstract

A variety of diagnosis that auscultation enables is not necessarily conducted thoroughly by all of the physicians because of its difficulty in judging by means of listening to evanescent sounds with their ears. A system that displays heart sounds continuously on a computer screen may be convenient for cardiac diagnosis. Recently, we made a monitor system with employing a piezoelectric transducer (PZT) sensor, which detected 1st and 2nd sound and murmurs clearly. In addition, the sensor was capable of detecting inaudible low-frequency sounds of below ~20Hz. Using the PZT sensor, we recorded heart sounds at left second intercostals space in 12 patients susceptible to cardiac diseases in parallel with ECG recording, and analysed the raw heart sounds and band-pass (20–100 Hz) filtered signal. Second sound in the filtered signal was completely or often absent and/or a sharp deflection, which appears coincidently with R wave, with a peak-peak voltage of >20 mV and a duration of <25 ms was missing in the raw sound signal in 90% (9/10) of the patients diagnosed as having cardiac dysfunctions. Thus, we believe that the PZT-based heart sound monitor system may contribute to the advance of the phonocardiographic diagnosis of cardiac diseases.

References

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Paper Citation


in Harvard Style

Sato S., Koyama T., Ono K., Igarashi G., Watanabe H., Ito H. and Muraoka M. (2011). CARDIAC DIAGNOSING BY A PIEZOELECTRIC-TRANSDUCER-BASED HEART SOUND MONITOR SYSTEM . In Proceedings of the International Conference on Biomedical Electronics and Devices - Volume 1: BIODEVICES, (BIOSTEC 2011) ISBN 978-989-8425-37-9, pages 280-283. DOI: 10.5220/0003288702800283


in Bibtex Style

@conference{biodevices11,
author={Shinichi Sato and Takashi Koyama and Kyoichi Ono and Gen Igarashi and Hiroyuki Watanabe and Hiroshi Ito and Mikio Muraoka},
title={CARDIAC DIAGNOSING BY A PIEZOELECTRIC-TRANSDUCER-BASED HEART SOUND MONITOR SYSTEM},
booktitle={Proceedings of the International Conference on Biomedical Electronics and Devices - Volume 1: BIODEVICES, (BIOSTEC 2011)},
year={2011},
pages={280-283},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0003288702800283},
isbn={978-989-8425-37-9},
}


in EndNote Style

TY - CONF
JO - Proceedings of the International Conference on Biomedical Electronics and Devices - Volume 1: BIODEVICES, (BIOSTEC 2011)
TI - CARDIAC DIAGNOSING BY A PIEZOELECTRIC-TRANSDUCER-BASED HEART SOUND MONITOR SYSTEM
SN - 978-989-8425-37-9
AU - Sato S.
AU - Koyama T.
AU - Ono K.
AU - Igarashi G.
AU - Watanabe H.
AU - Ito H.
AU - Muraoka M.
PY - 2011
SP - 280
EP - 283
DO - 10.5220/0003288702800283