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Loss of FHR variability diagnosed by frequency analysis
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Kazuo Maeda
Published/Copyright:
February 2, 2010
Abstract
Aims: To determine the loss of fetal heart rate (FHR) baseline variability by frequency analysis.
Methods: The FHR tracings of 12 normal fetuses and others with various conditions, as well as flat FHR tracings of a late deceleration (LD) and anencephaly recorded with Doppler fetal monitors, were scanned and processed using fast Fourier transform (FFT) analysis. The ratio of the area under the low frequency spectrum divided by the area under the whole spectrum (La/Ta) and the peak power spectrum density (PPSD) were determined.
Results: Long-term variability (LTV) measures >10 bpm revealed significantly more La/Ta and PPSD than LTV <10 bpm in normal FHR tracings. The La/Ta and PPSD were >15% and 60 bpm2/Hz, respectively, in representative values of normal FHR cases and in those of fetal respiration, hiccupps and non-reactive FHR, whereas those of the flat baseline of LD and anencephaly were <15% and 60 bpm2/Hz.
Conclusion: Loss of baseline variability is diagnosed when the La/Ta ratio and PPSD are <15% and 60 bpm2/Hz, respectively, based on the FFT frequency analysis of the FHR baseline.
Keywords: Anencephaly; computer processing; FFT frequency analysis; FHR baseline; late deceleration; long-term variability; loss of variability
Received: 2009-9-18
Revised: 2009-10-7
Accepted: 2009-10-20
Published Online: 2010-02-02
Published Online: 2010-02-2
Published in Print: 2010-03-01
©2010 by Walter de Gruyter Berlin New York
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Keywords for this article
Anencephaly;
computer processing;
FFT frequency analysis;
FHR baseline;
late deceleration;
long-term variability;
loss of variability
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