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Accuracy of noninvasive haemoglobin measurement by pulse oximetry depends on the type of infusion fluid.
MedLine Citation:
PMID:  23303244     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
CONTEXT: Measurement of blood haemoglobin concentration by pulse oximetry could be of value in determining when erythrocytes should be transfused during surgery, but the effect of infusion fluids on the results is unclear.
OBJECTIVE: To study the effect of crystalloid and colloid fluid on the accuracy (bias) and precision of pulse oximetry haemoglobin estimation to indicate the venous haemoglobin concentration in volunteers.
DESIGN: Open interventional crossover study.
SETTING: Single university hospital.
PARTICIPANTS: Ten male volunteers aged 18-28 (mean 22) years.
INTERVENTIONS: Each volunteer underwent three infusion experiments on separate days and in random order. The infusions were Ringer's acetate (20 ml kg), hydroxyethyl starch 130/0.4 (10 ml kg) and a combination of both.
RESULTS: At the end of the infusions of Ringer's acetate, pulse oximetry haemoglobin concentration had decreased more than the true haemoglobin concentration (15 vs. 8%; P < 0.005; n = 10) whereas starch solution decreased pulse oximetry haemoglobin concentration less than true haemoglobin concentration (7 vs. 11%; P < 0.02; n = 20). The same differences were seen when the fluids were infused separately and when they were combined. The overall difference between all 956 pairs of pulse oximetry haemoglobin concentration and true haemoglobin concentrations (the bias) averaged only -0.7 g l whereas the 95% prediction interval was wide, ranging from -24.9 to 23.7 g l. In addition to the choice of infusion fluid, the bias was strongly dependent on the volunteer (each factor, P < 0.001).
CONCLUSION: The bias of measuring haemoglobin concentration by pulse oximetry is dependent on whether a crystalloid or a colloid fluid is infused.
TRIAL REGISTRATION: ClinicalTrials identifier: NCT01195025.
Authors:
Christian Bergek; Joachim H Zdolsek; Robert G Hahn
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of anaesthesiology     Volume:  30     ISSN:  1365-2346     ISO Abbreviation:  Eur J Anaesthesiol     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8411711     Medline TA:  Eur J Anaesthesiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  73-9     Citation Subset:  IM    
Affiliation:
From the Section for Anaesthesia, Faculty of Health Sciences, Linköping University, Linköping, Sweden.
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