Vibroacoustic stimulation and intrauterine sound pressure levels

The sound pressure level in amniotic fluid generated by vibroacoustic stimulation, assessed with a hydrophone placed close to the fetal head, was studied in 16 subjects. The mean recorded sound pressure level was 115 dB and the highest level was 129 dB. The range of the background noise was 63.5-80....

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Bibliographic Details
Published inObstetrics and gynecology (New York. 1953) Vol. 78; no. 5 Pt 1; p. 803
Main Authors Nyman, M, Arulkumaran, S, Hsu, T S, Ratnam, S S, Till, O, Westgren, M
Format Journal Article
LanguageEnglish
Published United States 01.11.1991
Subjects
Acoustic Stimulation - instrumentation
Acoustic Stimulation - methods
Equipment Design
Female
Fetal Monitoring
Fetal Movement - physiology
Humans
Pregnancy
Pressure
Sound
Sound Spectrography
Uterus - physiology
Vibration - therapeutic use
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Summary:The sound pressure level in amniotic fluid generated by vibroacoustic stimulation, assessed with a hydrophone placed close to the fetal head, was studied in 16 subjects. The mean recorded sound pressure level was 115 dB and the highest level was 129 dB. The range of the background noise was 63.5-80.5 dB. There was no obvious relationship between the distance from the stimulator to the hydrophone and the intrauterine sound pressure level. Although sound pressure levels are high, they are probably reduced before reaching the cochlea of the fetus because of the surrounding amniotic fluid and the fluid in the middle ear.
ISSN:0029-7844