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Increased Fetal Activity and Heart Rate During and Immediately After Pulsed Doppler Echocardiography

Authors :
Antoinette Kenny
Sandra Hagen-Ansert
David J. Sahn
Christine E Sahn
Robert G. Weintraub
Takahiro Shiota
Kia Saeian
Source :
Echocardiography. 12:71-77
Publication Year :
1995
Publisher :
Wiley, 1995.

Abstract

Introduction: Previous reports have suggested that the use of continuous-wave Doppler for nonimaging heart rate monitoring or in utero Doppler imaging increased fetal activity. In this study, 11 fetuses (EGA 20–28 weeks) underwent a cardiac 2-D ultrasound and pulsed Doppler examination (since pulsed Doppler is more often used for fetal cardiac diagnosis) with 2-D and Doppler performed in a randomized order and with 10-minute ultrasound observation periods with as little transducer movement as possible before, during, and after 2-D only, and Doppler evaluation. Methods: All studies were performed with informed consent at the lowest available Doppler power < 90 mW/cm2 spatial peak temporal average. Fetal heart rate, the number of fetal gross movements / min, and the percent time occupied by fetal movements were evaluated by two blinded observers from video taped records. Patients had been referred to rule out fetal heart disorders but all echoes showed normal cardiac anatomy. Results: Fetal heart rate after pulsed Doppler study was statistically higher by analysis of variance (mean 127 beats/min) than in the pre-Doppler evaluation period (mean 120) and was highest during the Doppler exam period (mean 136; P < 0.05) in 10 of 11 fetuses. The percent time of fetal movements was highest during the Doppler exam period and in 9 of 11 fetuses movement increased. The raw number of gross movements / min, however, was highest after the Doppler. No such changes occurred during or after 2-D alone. Conclusion: Whether associated with slightly higher energy output, minimal thermal changes, or audible switching or electronic output sounds transmitted from the instrumentation through the uterus, fetal heart rate and activity increased in our study both during and after pulsed Doppler examination.

Details

ISSN :
15408175 and 07422822
Volume :
12
Database :
OpenAIRE
Journal :
Echocardiography
Accession number :
edsair.doi...........588cbebf79d52764796a5fb24c4a760b
Full Text :
https://doi.org/10.1111/j.1540-8175.1995.tb00523.x