Document Detail

Sex differences in linear and complex fetal heart rate dynamics of normal and acidemic fetuses in the minutes preceding delivery.
MedLine Citation:
PMID:  19021459     Owner:  NLM     Status:  MEDLINE    
AIM: To assess linear and complex heart rate dynamics in relation to fetal gender in normal and acidemic fetuses during the minutes preceding delivery. METHODS: Linear and non-linear fetal heart rate indices, namely mean FHR, long-term irregularity index, short-term variability, low and high frequency spectral indices, approximate and sample entropy, were assessed in 36 female and 30 male fetuses, adjusted for gestational age and weight, during the minutes preceding delivery. Analysis was performed in the initial and final minutes of each tracing in fetuses with umbilical artery blood pH at delivery >or=7.20, 7.11-7.19 and <or=7.10. RESULTS: Progression of labor was associated with a significant decrease in non-linear indices and an increase in almost all linear indices, both in female and male fetuses, but changes were more marked in female fetuses. Non-acidemic females showed higher mean FHR in the final minutes of labor, compared with males. Acidemic females had higher linear indices when compared to similar male fetuses. CONCLUSIONS: During the minutes preceding delivery, female fetuses express higher linear indices than male fetuses, suggesting greater activation of the autonomic nervous system, while maintaining similar complexity indices, which suggests different reaction and adaptation capabilities to stress and distress.
João Bernardes; Hernâni Gonçalves; Diogo Ayres-de-Campos; Ana Paula Rocha
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of perinatal medicine     Volume:  37     ISSN:  0300-5577     ISO Abbreviation:  J Perinat Med     Publication Date:  2009  
Date Detail:
Created Date:  2009-02-04     Completed Date:  2009-04-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0361031     Medline TA:  J Perinat Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  168-76     Citation Subset:  IM    
Departamento de Ginecologia e Obstetrícia, Faculdade de Medicina da Universidade do Porto, Hospital de S. João, Porto and Instituto Nacional de Engenharia Biomédica (INEB), Porto, Portugal.
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MeSH Terms
Birth Weight
Cross-Sectional Studies
Delivery, Obstetric
Gestational Age
Heart Rate, Fetal / physiology*
Hydrogen-Ion Concentration
Labor, Obstetric*
Retrospective Studies
Sex Characteristics*
Umbilical Arteries

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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