Document Detail

Effect of injectate temperature and thermistor position on reproducibility of thermodilution cardiac output determinations.
MedLine Citation:
PMID:  8082374     Owner:  NLM     Status:  MEDLINE    
STUDY OBJECTIVE: The purpose of this study was to evaluate the effect of thermistor position with varying injectate temperatures on the reproducibility of thermodilution cardiac output determination. The key hypothesis to be tested was that the positioning of the proximal thermistor at the right atrial port would improve the reproducibility of thermodilution cardiac output determination, independent of injectate temperature. DESIGN: Prospective randomized trial. SETTING: The study was performed in the cardiac catheterization laboratory of the West Haven Veterans Affairs Medical Center. PARTICIPANTS: Twenty consecutive patients undergoing right and left heart catheterizations were enrolled in the study. INTERVENTIONS: Each patient underwent triplicate determination of thermodilution cardiac output measurements under four experimental conditions: (1) ambient or room temperature injectate using an external thermistor in the injectate reservoir; (2) iced injectate using an external thermistor; (3) room temperature injectate using an internal right atrium (RA) thermistor; and (4) iced injectate using an RA thermistor. Reproducibility was assessed by the coefficient of variation (CV) and standard error of the mean percent (SEM%), of the triplicate measurements. MEASUREMENTS AND RESULTS: Using an internal RA thermistor improved the reproducibility of cardiac output determinations independent of injectate temperature. Using room temperature injectate, the CV was 12.8 percent using an external thermistor and 7.9 percent using an internal RA thermistor (p < 0.05). Using iced injectate, the CV was 10.2 percent using an external thermistor and 5.5 percent using an internal RA thermistor (p < 0.05). CONCLUSIONS: Reproducibility of thermodilution cardiac output determinations is improved when injectate temperature is measured internally, at the RA, as opposed to externally in the reservoir. This has clinical implications for determining significant changes in serial cardiac output determinations.
J E Williams; S E Pfau; L I Deckelbaum
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chest     Volume:  106     ISSN:  0012-3692     ISO Abbreviation:  Chest     Publication Date:  1994 Sep 
Date Detail:
Created Date:  1994-10-13     Completed Date:  1994-10-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0231335     Medline TA:  Chest     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  895-8     Citation Subset:  AIM; IM    
Department of Internal Medicine (Cardiology), Yale University School of Medicine.
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MeSH Terms
Analysis of Variance
Cardiac Output*
Diagnosis, Computer-Assisted / instrumentation,  methods,  statistics & numerical data
Heart Catheterization
Prospective Studies
Reproducibility of Results
Thermodilution / instrumentation*,  methods,  statistics & numerical data

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

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