Document Detail

Numerical analysis of the normal human antenatal fetal heart rate.
MedLine Citation:
PMID:  7259999     Owner:  NLM     Status:  MEDLINE    
A numerical method for separation of the frequency components of the fetal heart rate, and for identifying episodes of high or low variation, was applied to 196 64-minute ultrasound records in normal pregnancies during the last half of gestation. Most variables of heart period variation increased with gestation, as did the incidence of accelerations. Before 35 weeks, accelerations of greater than or equal to 14 beats/minute did not occur in all records. Cyclic episodes of low and high variation ("unreactive' and "reactive' episodes), associated with rest-activity cycles, could be identified from 27 weeks onwards. After 36 weeks gestation the length of low variation episodes increased and the variation during these episodes fell. Near term, low variation episodes lasted up to 40 minutes. It is concluded that on scrutiny of fetal heart rate records for evidence of normality, or otherwise, due account should be taken of gestational age.
G H Visser; G S Dawes; C W Redman
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of obstetrics and gynaecology     Volume:  88     ISSN:  0306-5456     ISO Abbreviation:  Br J Obstet Gynaecol     Publication Date:  1981 Aug 
Date Detail:
Created Date:  1981-10-25     Completed Date:  1981-10-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7503752     Medline TA:  Br J Obstet Gynaecol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  792-802     Citation Subset:  AIM; IM    
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MeSH Terms
Fetal Heart / physiology*
Gestational Age
Heart Rate*

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

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