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Noise Level and Perception of the Closing Click After Heart Valve Replacement with St. Jude Medical and Björk Shiley Monostrut Prostheses
Author(s) -
Moritz Anton,
Kobinia Georg,
Steinseifer Ulrich,
Wolters Heinrich,
Reul Helmut,
NeuwirthRiedl Kurt,
Grünbacher Günter,
Wolner Ernst
Publication year - 1990
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/j.1525-1594.1990.tb02983.x
Subject(s) - heart valve , sound (geography) , prosthesis , noise (video) , medicine , mechanical valve , sound pressure , cardiology , materials science , surgery , acoustics , physics , computer science , artificial intelligence , image (mathematics)
The metallic click generated by the closure of mechanical heart valve prostheses may severely bother patients, but generated sound energy and the extent of complaints after implantation are not known. In 62 patients, after valve Replacement with St. Jude Medical (SJM) (n = 35) and Björk Shiley Monostrut (BSM) (n = 27) prostheses, sound energy was recorded with a calibrated noise level analyzer at 5, 10, and 100 cm distance from patients and correlated with their complaints. At a distance of 100 cm, the BSM valves produced a significantly higher sound pressure level, 30.5 ± 5 db(A), compared to the SJM valves, 24.1 ±4 db(A) (p = 0.0001). There was no significant difference at shorter distances. After splitting into frequency bands the highest sound pressure levels were observed in the high frequency ranges (8 to 16 kHz) representing the metallic click. BSM valves produced higher sound levels in all frequency ranges at 1 m distance. Seventy‐three percent of all patients were aware of the noise generated by the valve; 20% had disturbed sleep; and 26% preferred a less noisy valve type. Twelve of 27 patients with BSM valves wanted less noisy valves, whereas only 4 of 35 patients with SJM valves wished to have a less noisy valve type (Chi‐square p = 0.003). In patients who could hear their valve measured, sound level was higher than in patients who could not. In 9 of 27 patients with BSM (33%), versus 3 of 35 with SJM prostheses (9%), the clicking caused sleep disturbances. In 85% of BSM, versus 63% SJM, patients could hear their valve (p = 0.05). Since higher sound pressure levels generated by the closing click resulted in an increased rate of complaints, noise level should be regarded as a criterion when a mechanical heart valve prosthesis is selected.