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Titolo:
A new method for quantitative evaluation of perceived sounds from mechanical heart valve prostheses
Autore:
Johansen, P; Riis, C; Hasenkam, JM; Paulsen, PK; Nygaard, H;
Indirizzi:
Aarhus Univ Hosp, Dept Cardiothorac & Vasc Surg, Skejby Sygehus, DK-8200 Aarhus N, Denmark Aarhus Univ Hosp Aarhus Denmark N jby Sygehus, DK-8200 Aarhus N, Denmark Coll Engn, Aarhus, Denmark Coll Engn Aarhus DenmarkColl Engn, Aarhus, Denmark Aarhus Univ Hosp, Inst Expt Clin Res, Skejby Sygehus, DK-8200 Aarhus, Denmark Aarhus Univ Hosp Aarhus Denmark DK-8200 Sygehus, DK-8200 Aarhus, Denmark
Titolo Testata:
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
fascicolo: H1, volume: 214, anno: 2000,
pagine: 121 - 128
SICI:
0954-4119(2000)214:H1<121:ANMFQE>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
BJORK-SHILEY MONOSTRUT; DUROMEDICS EDWARDS; CLOSING CLICK; LEVEL; COMPLAINTS; REPLACEMENT; PERCEPTION; PRESSURE; NOISE;
Keywords:
perceived sounds; mechanical heart valve prostheses; feedback method;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Nygaard, H Aarhus Univ Hosp, Dept Cardiothorac & Vasc Surg, Skejby Sygehus, Brendstrupgaardsvej, DK-8200 Aarhus N, Denmark Aarhus Univ Hosp Brendstrupgaardsvej Aarhus Denmark N Denmark
Citazione:
P. Johansen et al., "A new method for quantitative evaluation of perceived sounds from mechanical heart valve prostheses", P I MEC E H, 214(H1), 2000, pp. 121-128

Abstract

Closing clicks from mechanical heart valve prostheses are transmitted to the patient's inner ear mainly in two different ways: as acoustically transmitted sound waves, and as vibrations transmitted through bones and vessels. The purpose of this study was to develop a method for quantifying what patients perceive as sound from their mechanical heart valve prostheses via these two routes. In this study, 34 patients with implanted mechanical bileaflet aortic and mitral valves (St Jude Medical and On-X) were included. Measurements were performed in a specially designed sound insulated chamber equipped with microphones, accelerometers, preamplifiers and a loudspeaker. The closing sounds measured with an accelerometer on the patient's chest were delayed 400 ms, amplified and played back to the patient through the loudspeaker. The patient adjusted the feedback sound to the same level as the 'real-time' clicks he or she perceived directly from his or her valve. In this way the feedback sound energy includes both the air- and the bone-transmitted energies. Sound pressure levels (SPLs) were quantified both in dB(A) and in the loudness unit sone according to ISO 532B (the Zwicker method). The mean air-transmitted SPL measured close to the patient's ear was 23 +/- 4 dB(A). The mean air- and bone-transmitted sounds and vibrations were perceived by the patients as an SPL of 34 +/- 5 dB(A). There was no statistically significant difference in the perceived sound from the two investigated bileaflet valves, and no difference between aortic and mitral valves. The study showed that the presented feedback method is capable of quantifying the perceived sounds and vibrations from mechanical heart valves, if the patient's hearing is not too impaired. Patients with implanted mechanicalheart valve prostheses seem to perceive the sound from their valve two to three times higher than nearby persons, because of the additional bone-transmitted vibrations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 07:35:59