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Fetal Diagn Ther. 2003 Jul-Aug;18(4):284-8.

Spectral analysis of fetal heart rate variability in fetuses with supraventricular extrasystoles.

Author information

1
Department of Obstetrics and Gynaecology, University of Basel, Basel, Switzerland.

Abstract

OBJECTIVE:

Fetal heart rate (FHR) variability is an important indicator of fetal well-being. In fetal tachyarrhythmias, however, visual analysis of FHR variability is limited. We therefore applied power spectral analysis of FHR to evaluate the fetal state.

METHODS:

Fetal R-R intervals were detected by means of an external ECG in 3 fetuses with supraventricular extrasystoles after cardiac malformations had been excluded by fetal echocardiography. Using an autoregressive model, power spectral densities were calculated from 20 consecutive 256-beat segments for the following frequency bands: <0.03 Hz (very low frequency), 0.03-0.069 Hz (low frequency; LF), 0.07-0.129 Hz (mid-frequency) and 0.13-1.0 Hz (high frequency; HF).

RESULTS:

The FHR variability in fetal supraventricular extrasystoles mainly resulted from the HF component (63.91 +/- 6.97%). The sympatho-vagal balance (LF/HF) was decreased in the tracings with extrasystoles (0.13).

CONCLUSION:

The analysis of FHR variability in fetal supraventricular extrasystoles revealed an imbalance between sympathetic and parasympathetic regulation.

PMID:
12835591
DOI:
10.1159/000070811
[Indexed for MEDLINE]

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