Piezoelectric vibrator-stimulated potential and heart rate accelerations detected from the fetus

Abstract Objectives The fetus is well known to have a substantial capacity for sound recognition in the uterine environment. The aim of this study was to develop a sound stimulus system equipped with a piezoelectric vibrator (PV), record the PV-stimulated potential (PVSP) of the fetus and monitor ch...

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Published inInternational journal of pediatric otorhinolaryngology Vol. 101; pp. 204 - 210
Main Authors Matsuoka, Rina, Lee, Sinyoung, Sato, Miho, Hibiya, Remi, Shimanuki, Yota, Kasai, Misato, Kamiya, Kazusaku, Itakura, Atsuo, Koike, Takuji, Ikeda, Katsuhisa
Format Journal Article
LanguageEnglish
Published Ireland Elsevier B.V 01.10.2017
Subjects
Acoustic Stimulation - methods
Evoked Potentials, Auditory - physiology
Female
Fetus
Gestational Age
Heart Rate
Heart rate acceleration
Heart Rate, Fetal - physiology
Humans
Otolaryngology
Pediatrics
Piezoelectric vibrator
Pregnancy
Pressure
Sound
Sound stimulus
Fetus
Sound stimulus
Heart rate acceleration
Piezoelectric vibrator
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Summary:Abstract Objectives The fetus is well known to have a substantial capacity for sound recognition in the uterine environment. The aim of this study was to develop a sound stimulus system equipped with a piezoelectric vibrator (PV), record the PV-stimulated potential (PVSP) of the fetus and monitor changes of the fetal heart rate (FHR) under PV stimulation. Methods The relationship between the input voltage applied to a piezoelectric vibrator and the sound pressure generated in the uterus was calibrated based on a model of the maternal abdomen. Fourteen fetuses for the measurement of the PVSP and 22 fetuses for the measurement of the heart rate changes from low-risk pregnant women were recruited. Results The PVSP responses were obtained in 9 out of 14 fetuses. All the tested fetuses accelerated the FHR after the 2 kHz tone stimulation at 70 dB intensity generated by PV from 32 to 37 weeks gestational age. Conclusions Using a newly developed sound stimulus system equipped with PV, the electric responses of a fetus recorded from electrodes placed on the mother’s abdomen may be closely related to the auditory evoked response. Significant accelerations of FHR were objectively, accurately and readily obtained after the sound stimulation.
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ISSN:0165-5876
1872-8464
DOI:10.1016/j.ijporl.2017.05.007