Document Detail


Reflectance pulse oximetry in fetal lambs: subcutaneous vessels and vasoconstriction affect its reliability.
MedLine Citation:
PMID:  8823646     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: Reflectance pulse oximetry (RPOX) has been introduced for intrapartum fetal surveillance. The purpose of this study was to describe two possible effects on the reliability of RPOX, namely the effect of the presence of a subcutaneous vein and the effect of vasoconstriction by adrenaline, both at fetal SaO2 levels. METHODS: In four anesthetized fetal lambs, a prototype 660/890 nm reflectance sensor (Nellcor Inc.) was placed on the fetal head, with the photodiode of the sensor precisely over a superficial subcutaneous vein. Measurements were made before and after coagulation of the vein. In five anesthetized fetal lambs, one or two reflectance sensors were placed on the fetal head and/or neck and adrenaline was administered in doses of 0.02 to 0.04 mg via a brachial artery. Pulse oximeter saturation readings (SpO2) were compared with continuous arterial oxygen saturation (SaO2) values obtained using a fiberoptic catheter (Opticath, Abbott) in the carotid artery. RESULTS: When the sensor was placed over the vein, the pulse oximeter read 18% to 24% too low at a SaO2 level of 20% to 50%. After coagulation of the vein, SpO2 readings were in agreement with fiberoptic SaO2 values. Administration of adrenaline resulted in a large overestimation of the SaO2 in 6 of the 7 measurements. CONCLUSIONS: Subcutaneous veins and vasoconstriction can affect the reliability of reflectance pulse oximetry. As comparable situations may occur during labor, SpO2 readings should be interpreted with caution when this kind or comparable types of RPOX sensors are used at low SaO2 levels.
Authors:
R Nijland; H W Jongsma; I M Verbruggen; J G Nijhuis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of clinical monitoring     Volume:  12     ISSN:  0748-1977     ISO Abbreviation:  J Clin Monit     Publication Date:  1996 May 
Date Detail:
Created Date:  1996-12-09     Completed Date:  1996-12-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8506707     Medline TA:  J Clin Monit     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  225-30     Citation Subset:  IM    
Affiliation:
Department of Obstetrics & Gynaecology, University Hospital Nijmegen, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Animals
Epinephrine / pharmacology
Female
Fetal Blood*
Fetal Monitoring*
Oximetry / methods*,  standards
Pregnancy
Reproducibility of Results
Sheep
Vasoconstriction / drug effects
Chemical
Reg. No./Substance:
51-43-4/Epinephrine

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


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