Document Detail

Alteration in the low-frequency domain in power spectral analysis of fetal heart beat fluctuations.
MedLine Citation:
PMID:  10085506     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Spectral analysis was conducted on fetal heart rate fluctuations for the purpose of investigating the change in gestational age and examining the usefulness as a method of estimating fetal blood gas. STUDY DESIGN: Five hundred and twenty-nine pregnant women with a single normal fetus and 26 women with intrauterine growth restriction (IUGR) were studied during the 20th to 38th gestational weeks. In cases of IUGR, fetal blood gas levels were evaluated with percutaneous umbilical blood sampling. A time series of fetal heart rate fluctuation was obtained with a 1. 15-MHz ultrasonic transducer, and power spectral analysis of 200 consecutive stable beats was performed with an autoregression method. Integrated areas of 0.025-0.125 cycles/beat were defined as low-frequency areas (LFAs) and were examined in normal fetuses. In addition, the relation between LFA and fetal blood gas values was studied. RESULTS: As pregnancy progressed, LFA increased with a cubic regression equation (Y = 6.484 - 0.764X + 0.029X2 - 0.00034X3). The correlation coefficient was 0.625 (p < 0.05). In the cases of IUGR, DeltaLFA was highly correlated with DeltapO2 and DeltapH (correlation coefficient, 0.650 and 0.618, respectively). CONCLUSIONS: Measurement of LFA provides insight into the development of fetal autonomic function and also may serve as a quantitative index of fetal well-being in mid-pregnancy.
T Ohta; K Okamura; Y Kimura; T Suzuki; T Watanabe; T Yasui; N Yaegashi; A Yajima
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Fetal diagnosis and therapy     Volume:  14     ISSN:  1015-3837     ISO Abbreviation:  Fetal. Diagn. Ther.     Publication Date:    1999 Mar-Apr
Date Detail:
Created Date:  1999-05-27     Completed Date:  1999-05-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9107463     Medline TA:  Fetal Diagn Ther     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  92-7     Citation Subset:  IM    
Department of Obstetrics and Gynecology, Tohoku University School of Medicine, Sendai, Japan.
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MeSH Terms
Fetal Growth Retardation / physiopathology
Gestational Age
Heart Rate, Fetal*
Regression Analysis
Ultrasonography, Prenatal*

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