Document Detail

Measurement of cardiac output with a non-invasive continuous wave Doppler device versus the pulmonary artery catheter: a comparative study.
MedLine Citation:
PMID:  17227267     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION AND AIM: Cardiac index remains an important measured variable used to optimise fluid and haemodynamic support in the postoperative cardiac setting. Recent developments in non-invasive continuous wave Doppler devices enable rapid assessment of cardiac index with decreased morbidity. This study aimed to determine the clinical utility of one such device, the USCOM device (USCOM Ltd, Sydney, NSW), in assessing cardiac index compared with invasive continuous measurements of cardiac index using a pulmonary artery (PA) catheter. METHODS: A prospective study was undertaken in patients admitted to an intensive care unit after cardiac revascularisation, open-heart surgery or cardiac or pulmonary transplant, most of whom required haemodynamic support. Cardiac index was measured by a single operator using the USCOM device. Continuous cardiac index measurements using the PA catheter were obtained (blinded to USCOM measurements) within 15 minutes of the USCOM measurement. RESULTS: 30 patients were enrolled. Adequate Doppler signals were obtained in 26, yielding 34 paired measurements. Comparison of the two methods using a Bland-Altman analysis identified a bias of 0.22 with limits of agreement of - 1.17 (- 1.53 to - 0.82) and 1.62 (1.26 to 1.97), representing limits of agreement for interchangeability of 52%. CONCLUSION: In a heterogeneous population of postoperative cardiac patients, non-invasive determination of cardiac index using USCOM had limited clinical utility. Doppler flow signal quality may have been affected by intrathoracic air, patient position and operator learning curve. Given accepted inherent inaccuracies of continuous cardiac output assessment, further investigation is required to validate the suitability of USCOM in this patient population.
Janet S Chan; Davendra Segara; Priya Nair
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Critical care and resuscitation : journal of the Australasian Academy of Critical Care Medicine     Volume:  8     ISSN:  1441-2772     ISO Abbreviation:  Crit Care Resusc     Publication Date:  2006 Dec 
Date Detail:
Created Date:  2007-01-17     Completed Date:  2007-02-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888170     Medline TA:  Crit Care Resusc     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  309-14     Citation Subset:  IM    
Intensive Therapy Unit, St Vincent's Hospital, Sydney, NSW, Australia.
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MeSH Terms
Cardiac Output*
Cardiac Surgical Procedures*
Catheterization, Swan-Ganz*
Echocardiography, Doppler*
Lung / surgery
Middle Aged
Prospective Studies

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

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