Document Detail

Artifacts in fetal pulse oximetry: nonarterial pulsatile signals.
MedLine Citation:
PMID:  8166205     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: We wished to investigate the effect of caput succedaneum on pulse oximetry readings. STUDY DESIGN: Oxygen saturation was measured by reflection pulse oximetry on various sites of scalps of 18 healthy neonates. The pulse rate obtained from the oximeter was checked against the heart rate from the electrocardiogram to see whether they were in agreement and synchronized. RESULTS: Nonsynchronized saturation values had a much wider range (30 to 97 vs 70 to 98) and a significantly lower mean (70 vs 84) than did synchronized values. Synchronized readings were obtainable in all 18 subjects over the temporal region but in only 39% of cases over the occipital region. Fourteen neonates had caput succedaneum, and in nine (61%) of these synchronized readings were not possible. It was noted that falsely low saturation values can be derived from pulsating waveforms, which have a slower rate than the electrocardiogram rate. CONCLUSIONS: The observed low pulsation rate is either of venous origin or represents modulated transmission of arterial signal through an edematous or congested scalp. This artifact will result in nonarterial oxygen saturation readings, and its exclusion is of importance in the development of pulse oximetry for intrapartum monitoring of the fetus.
C M Schram; J O Gardosi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of obstetrics and gynecology     Volume:  170     ISSN:  0002-9378     ISO Abbreviation:  Am. J. Obstet. Gynecol.     Publication Date:  1994 Apr 
Date Detail:
Created Date:  1994-05-26     Completed Date:  1994-05-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370476     Medline TA:  Am J Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1174-7     Citation Subset:  AIM; IM    
Department of Obstetrics and Gynaecology, University of Nottingham, United Kingdom.
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MeSH Terms
Fetal Monitoring / instrumentation*

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

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