Loss of FHR variability diagnosed by frequency analysis

Journal of Perinatal Medicine
Kazuo Maeda, Takashi Nagawawa


To determine the loss of fetal heart rate (FHR) baseline variability by frequency analysis. 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. 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. 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.


Sep 25, 2002·European Journal of Obstetrics, Gynecology, and Reproductive Biology·Yariv YogevBoris Kaplan
Aug 23, 2005·Fetal Diagnosis and Therapy·Kazuo Maeda, Takashi Nagasawa
May 13, 2006·The Journal of Maternal-fetal & Neonatal Medicine : the Official Journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians·E SalamalekisG Creatsas
Aug 29, 2006·Medical & Biological Engineering & Computing·M RomanoM Bracale

Related Concepts

Fetal Monitoring
Heart Rate, Fetal
Fetal Heart
Doppler Ultrasound (Procedure)
Spectroscopy, Fourier Transform Infrared

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