Fetal acoustic stimulation test: Stimulus features of three artificial larynges recorded in sheep - 12/09/11
Reprint requests: Robert M. Abrams, PhD, University of Florida College of Medicine, Departments of Obstetrics and Gynecology, P.O. Box 100294, Gainesville, FL 32610-0294.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 an 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.
Le texte complet de cet article est disponible en PDF.Keywords : Vibroacoustic stimulation, artificial larynx, sheep
 | Supported by National Institutes of Health grant No. HD20084. |
Vol 173 - N° 5
P. 1372-1376 - novembre 1995 Retour au numéro
Article précédent
- Fetal acoustic stimulation, an adjunct to external cephalic version: A blinded, randomized crossover study
- Robert L. Johnson, John P. Elliott
- Prospective determination of chorionicity, amnionicity, and zygosity in twin gestations
- James A. Scardo, Janna M. Ellings, Roger B. Newman
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