Fetal acoustic stimulation test: stimulus features of three artificial larynges recorded in sheep.
Publication/Presentation Date
11-1-1995
Abstract
OBJECTIVE: The purpose of the current study was to evaluate the characteristics of vibroacoustic devices used for fetal stimulation.
STUDY DESIGN: Intrauterine sound pressure levels over a frequency range of 40 to 5000 Hz were measured with hydrophones in anesthetized sheep. Stimulators included the AT&T (Martinsburg, W.V.) and Servox (Hearing Instruments, Piscataway, N.J.) artificial larynges, the Corometrics fetal acoustic stimulator (Wallingford, Conn.) and electric toothbrush.
RESULTS: Intrauterine spectral patterns resulting from stimulation with the AT&T, Servox, and Corometrics devices were characterized by numerous high-level overtones above a fundamental frequency between 97 and 163 Hz. Fundamental frequencies recorded during toothbrush stimulation were 22 to 24 Hz with reduced but identifiable overtones up to 250 Hz.
CONCLUSIONS: Fetal vibroacoustic stimulators that operate on the principle of the electronic artificial larynx produce very similar intrauterine sound pressure levels.
Volume
173
Issue
5
First Page
1372
Last Page
1376
ISSN
0002-9378
Published In/Presented At
Abrams, R. M., Gerhardt, K. J., Rosa, C., & Peters, A. J. (1995). Fetal acoustic stimulation test: stimulus features of three artificial larynges recorded in sheep. American journal of obstetrics and gynecology, 173(5), 1372–1376. https://doi.org/10.1016/0002-9378(95)90618-5
Disciplines
Medicine and Health Sciences
PubMedID
7503170
Department(s)
Department of Obstetrics and Gynecology
Document Type
Article