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[The fetus and noise]

C Brezinka¹, T Lechner, K Stephan

¹Universitäts-Klinik für Frauenheilkunde, Innsbruck, Osterreich.

Gynakologisch-Geburtshilfliche Rundschau

|January 1, 1997

Summary

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Healthy fetuses can react to sound from 23 weeks gestation. Vibroacoustic stimulation tests (VAST) are used for fetal monitoring, but require careful consideration of maternal noise and sound frequency.

Area of Science:

Obstetrics and Gynecology
Fetal Physiology
Bioacoustics

Context:

The intrauterine environment is characterized by maternal sounds, with background noise levels varying significantly.
Fetal auditory development allows responses to sound stimulation from early gestation (23-28 weeks).
High-frequency sounds are attenuated by maternal tissues, necessitating low-frequency stimuli for fetal perception.

Purpose:

To review the application and efficacy of Vibroacoustic Stimulation Tests (VAST) in fetal monitoring.
To discuss the advantages and challenges associated with different VAST protocols.
To analyze VAST in the context of animal and clinical studies.

Summary:

Fetal auditory capabilities develop by 23-28 weeks gestation, reacting to sound stimuli.

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Maternal sounds dominate the intrauterine acoustic environment; effective fetal auditory stimulation requires low-frequency sounds exceeding background noise.

Vibroacoustic Stimulation Tests (VAST), often using an artificial larynx, are increasingly used in pregnancy surveillance.

Impact:

Highlights the importance of understanding fetal auditory perception for effective prenatal monitoring.
Informs the development and application of VAST protocols for improved fetal surveillance.
Raises awareness of occupational noise exposure risks for pregnant musicians and dancers, contrasting with industrial regulations.