Document Detail

Marked fetal acidosis and specific changes in power spectrum analysis of fetal heart rate variability recorded during the last hour of labour.
MedLine Citation:
PMID:  15777438     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To assess whether intrapartum acidosis affects specific components of fetal heart rate variability. DESIGN: Prospective clinical study. SETTING: Twelve Nordic delivery units. SUBJECTS: Fetal heart rate variability was studied in 334 fetuses divided into two groups according to cord pH value: the acidotic group (cord arterial pH < 7.05 at birth, n= 15) and the control group (cord arterial pH > or =7.05 at birth, n= 319). METHODS: In spectral analysis of fetal heart rate variability, frequencies were integrated over the total frequency band (0.04-1.0 Hz), low-frequency band (0.04-0.15 Hz) and high-frequency band (0.15-1.0 Hz). We also calculated the low-to-high frequency ratio. MAIN OUTCOME MEASURES: The spectral bands of fetal heart rate variability were compared between the acidotic and control fetuses. RESULTS: We found that during the last hour of monitoring, baseline fetal heart rate gradually decreased, whereas total, low-frequency and high-frequency fetal heart rate variability initially increased but then, near the delivery, decreased in the acidotic fetuses when compared with the controls. Low-to-high frequency ratio was greater in the acidotic group during the whole study period (P= 0.002). Cord artery pH was inversely associated with total fetal heart rate variability (P < 0.001), low-frequency fetal heart rate variability (P < 0.001) and low-to-high frequency ratio (P= 0.004). CONCLUSIONS: Marked fetal acidosis was associated with frequency-specific changes in fetal heart rate variability as reflecting the compensation ability of autonomic nervous activation during the last hour of labour.
Saila M Siira; Tiina H Ojala; Tero J Vahlberg; Jarmo O Jalonen; Ilkka A Välimäki; Karl G Rosén; Eeva M Ekholm
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Publication Detail:
Type:  Comparative Study; Journal Article; Multicenter Study; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  BJOG : an international journal of obstetrics and gynaecology     Volume:  112     ISSN:  1470-0328     ISO Abbreviation:  BJOG     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-03-21     Completed Date:  2005-05-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100935741     Medline TA:  BJOG     Country:  England    
Other Details:
Languages:  eng     Pagination:  418-23     Citation Subset:  AIM; IM    
Research Centre of Applied and Preventive Cardiovascular Medicine (CAPC), University of Turku, Kiinamyllynkatu 10, 20520 Turku, Finland.
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MeSH Terms
Acidosis / diagnosis*,  physiopathology
Cardiotocography / standards
Delivery, Obstetric / methods
Electrocardiography / standards
Fetal Diseases / diagnosis*,  physiopathology
Heart Rate, Fetal / physiology*
Hydrogen-Ion Concentration
Prospective Studies
Spectrum Analysis / standards
Time Factors
Umbilical Arteries

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