Document Detail


Dynamic computed tomography to determine cardiac output in patients with left ventricular assist devices.
MedLine Citation:
PMID:  19379994     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: The purpose of this study was to develop and test a novel, noninvasive means of estimating cardiac output in patients with continuous-flow left ventricular assist devices. METHODS: Based on the indicator dilution principle, we estimated cardiac output from signal intensity versus time recordings during first-pass imaging with contrast-enhanced computed tomography. To account for recirculation, a gamma variate function was modified to model the indicator concentration curve. A proportionality constant for 64-slice computed tomography data acquisition was derived relating computed tomography Hounsfield units to indicator concentration. Validity of the equation was tested in ambulatory patients with continuous-flow left ventricular assist devices who underwent simultaneous computed tomography and Swan-Ganz catheter thermodilution-based measurement of cardiac output at various left ventricular assist device rpm settings. Agreement between measurements was testing using kappa statistic. RESULTS: Pairwise comparison of calculated output using the dynamic computed tomography test bolus technique versus thermodilution output measurements yielded good agreement (P = .03). The output calculated using dynamic computed tomography underestimated the thermodilution output measurement by 0.54 +/- 0.37 L/min (95% confidence interval, 0.66-0.94). CONCLUSIONS: Noninvasive estimation of cardiac output from left ventricular assist devices is feasible using first-pass dynamic computed tomography. By affording simultaneous good visualization of the device in situ, computed tomography may be useful for noninvasive assessment of location and function of ambulatory patients with left ventricular assist devices.
Authors:
Subha V Raman; Tam Tran; Orlando P Simonetti; Benjamin Sun
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2009-02-07
Journal Detail:
Title:  The Journal of thoracic and cardiovascular surgery     Volume:  137     ISSN:  1097-685X     ISO Abbreviation:  J. Thorac. Cardiovasc. Surg.     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-04-21     Completed Date:  2009-05-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376343     Medline TA:  J Thorac Cardiovasc Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1213-7     Citation Subset:  AIM; IM    
Affiliation:
The Ohio State University, Columbus, OH 43210, USA. raman.1@osu.edu
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MeSH Terms
Descriptor/Qualifier:
Cardiac Output*
Contrast Media / diagnostic use
Coronary Angiography / methods
Female
Heart Catheterization / methods
Heart-Assist Devices*
Humans
Image Processing, Computer-Assisted*
Linear Models
Male
Models, Cardiovascular
Monitoring, Physiologic / instrumentation,  methods
Probability
Sampling Studies
Sensitivity and Specificity
Statistics, Nonparametric
Thermodilution / instrumentation,  methods*
Tomography, X-Ray Computed / methods*
Grant Support
ID/Acronym/Agency:
R21 HL080474-01/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Contrast Media

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


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