| Loss of FHR variability diagnosed by frequency analysis. | |
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MedLine Citation:
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PMID: 20121543 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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 bpm(2)/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 bpm(2)/Hz. CONCLUSION: Loss of baseline variability is diagnosed when the La/Ta ratio and PPSD are <15% and 60 bpm(2)/Hz, respectively, based on the FFT frequency analysis of the FHR baseline. |
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Authors:
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Kazuo Maeda; Takashi Nagawawa |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of perinatal medicine Volume: 38 ISSN: 1619-3997 ISO Abbreviation: J Perinat Med Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-03-04 Completed Date: 2010-06-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0361031 Medline TA: J Perinat Med Country: Germany |
Other Details:
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Languages: eng Pagination: 197-201 Citation Subset: IM |
Affiliation:
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Department of Obstetrics and Gynecology, Tottori University School of Medicine, Yonago, Japan. maedak@mocha.ocn.ne.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Cardiotocography
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methods* Female Fetal Monitoring / methods* Heart Rate, Fetal / physiology* Humans Pregnancy |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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