Document Detail

Transgastric continuous-wave Doppler to determine cardiac output.
MedLine Citation:
PMID:  8456766     Owner:  NLM     Status:  MEDLINE    
A new method to measure cardiac output using transgastric continuous-wave Doppler was evaluated in 31 consecutive patients undergoing cardiac surgery with simultaneous measurement of cardiac output by the thermodilution technique. A 5 MHz single-plane imaging/5 MHz continuous-wave Doppler transesophageal transducer was used to image the left ventricular outflow tract, aortic valve and ascending aorta from a modified transgastric short-axis plane. The continuous-wave Doppler cursor was aligned parallel with blood flow across the aortic valve to obtain the maximal Doppler velocity spectra. Stroke volume was obtained by multiplying the mean Doppler flow velocity integral by the aortic annulus area, which was calculated from its diameter measured from the esophageal 5-chamber view. The stroke volume was multiplied by heart rate to yield cardiac output. A total of 57 simultaneous thermodilution and Doppler studies were attempted. Doppler data were technically limited for 2 patients both before and after cardiopulmonary bypass and for 3 patients before cardiopulmonary bypass with a result of 50 adequate studies of 57 (88%) attempted. The Doppler-derived cardiac outputs were correlated with the simultaneous measurements of cardiac output by the thermodilution technique. Linear regression analysis revealed a close correlation with R = 0.91, SEE = 0.8 liter/min, and y = 1.01x + 0.2 (p < 0.001). In conclusion, transgastric continuous-wave Doppler across the aortic valve is a promising new technique that may be used in selected patients for accurate measurement of cardiac output.
W E Katz; T A Gasior; J J Quinlan; J Gorcsan
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The American journal of cardiology     Volume:  71     ISSN:  0002-9149     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  1993 Apr 
Date Detail:
Created Date:  1993-04-20     Completed Date:  1993-04-20     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  853-7     Citation Subset:  AIM; IM    
Department of Medicine, University of Pittsburgh Medical Center, Pennsylvania 15213.
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MeSH Terms
Cardiac Output*
Cardiac Surgical Procedures
Cardiopulmonary Bypass
Echocardiography, Doppler / methods*
Evaluation Studies as Topic
Feasibility Studies
Middle Aged
Monitoring, Intraoperative / methods*
Reference Standards
Regression Analysis
Stroke Volume
Erratum In:
Am J Cardiol 1993 Aug 1;72(3):372

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

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