Redistribution of power spectrum of heart rate variability during acute umbilical artery embolism and hypoxemia in late-gestation fetal sheep

Li, X, Tang, D, Zhou, S, Zhou, G, Wang, C, Zhuang, Y, Wu, G and Shen, L 2004, 'Redistribution of power spectrum of heart rate variability during acute umbilical artery embolism and hypoxemia in late-gestation fetal sheep', European Journal of Obstetrics & Gynecology and Reproductive Biology , vol. 114, no. 12, pp. 137-143.


Document type: Journal Article
Collection: Journal Articles

Title Redistribution of power spectrum of heart rate variability during acute umbilical artery embolism and hypoxemia in late-gestation fetal sheep
Author(s) Li, X
Tang, D
Zhou, S
Zhou, G
Wang, C
Zhuang, Y
Wu, G
Shen, L
Year 2004
Journal name European Journal of Obstetrics & Gynecology and Reproductive Biology
Volume number 114
Issue number 12
Start page 137
End page 143
Total pages 7
Publisher Elsevier Ireland Ltd
Abstract Objects: Fetal heart rate variability (HRV) is subject to a number of factors, including fetal distress. The aim of this study was to investigate the power spectral distribution of fetal heart rate variability during acute hypoxemia following umbilical artery embolism and to test the hypothesis that the relative proportion of frequency domains in total power of HRV, reflects the changes in HRV during hypoxemia more closely than the absolute values. Methods: Acute hypoxemia was induced in seven catheterized late-gestation fetal sheep by repeated injections of microspheres to cause umbilical artery embolism. The very-low, low-, middle- and high-frequency domains (0-0.025, 0.025-0.125, 0.125-0.20, and 0.20-0.50 cycles/beat, respectively) were determined by power spectral analysis. Results: Umbilical artery embolism induced marked fetal hypoxemia, hypercapnia and acidosis, accompanied by an increase in heart rate and a decrease in arterial blood pressure. These changes were associated with the increase in power over the entire frequency range and in the relative power in the low-frequency range (P<0.01), and with decrease in the relative power in the high-frequency range (P<0.05). Correlations were found between the relative power in the low- and high-frequency ranges and PO2 and between the relative power in these ranges and mean arterial blood pressure (P<0.05), but not PCO2 or pH. Conclusions: The present study indicates that acute hypoxemia induced by umbilical artery embolism leads to the redistribution of power spectral density of fetal HRV and that the relative proportion of individual frequency domains may reflect the changes in HRV during acute hypoxemia more closely than the absolute power values.
Subject Basic Pharmacology
Copyright notice © 2003 Elsevier Ireland Ltd. All rights reserved.
ISSN 0301-2115
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