Document Detail


The role of epicardial echocardiography in the measurement of transvalvular flow velocities during aortic valve replacement.
MedLine Citation:
PMID:  19464624     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
OBJECTIVE: The purpose of this study was to compare transvalvular flow velocities obtained by transesophageal echocardiography and epicardial echocardiography (EE) during aortic valve replacement (AVR). DESIGN: Prospective observational study. SETTING: University hospital. PARTICIPANTS: Patients undergoing AVR for aortic stenosis. INTERVENTIONS: After institutional review board approval, 17 patients undergoing AVR consented. Deep transgastric (deep TG LAX) and transgastric long-axis (TG LAX) views and epicardial aortic valve long-axis views (S8 probe) were obtained on a SONOS 5500 (Phillips Medical Systems, Bothell, WA) before and after AVR. Transvalvular flow velocity and velocity time integral (VTI) were recorded via each technique. Measurements were made offline by 2 independent reviewers. Agreement between measurements made by different views was evaluated by using Bland-Altman analysis. MEASUREMENTS AND MAIN RESULTS: The epicardial probe was well tolerated. Quality images were obtained in all patients with TEE and 30 of 34 studies via epicardial scanning. The mean bias for peak velocities derived through EE and deep TG LAX was 96.3 cm/s (95% confidence interval [CI], 51.1-141.4) before AVR and 58 cm/s (95% CI, 32.4-83.7) after AVR. The mean bias for peak velocities between EE and TG LAX was 70 cm/s (95% CI, 31.1-108.9) before and 84.7 cm/s (95% CI, 55.6-113.7) after AVR. Similar results were obtained for VTI. CONCLUSIONS: Peak transaortic valve velocities and VTI measured with epicardial echocardiography are higher in comparison to measurements via TEE in patients undergoing AVR. The precise role of epicardial echocardiography in the comprehensive echocardiographic examination of patients undergoing aortic valve replacement needs further evaluation.
Authors:
Ravi Taneja; Bert Quaghebeur; Larry W Stitt; Mackenzie A Quantz; Lin R Guo; Bob Kiaii; Daniel T Bainbridge
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of cardiothoracic and vascular anesthesia     Volume:  23     ISSN:  1532-8422     ISO Abbreviation:  J. Cardiothorac. Vasc. Anesth.     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-05-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9110208     Medline TA:  J Cardiothorac Vasc Anesth     Country:  United States    
Other Details:
Languages:  eng     Pagination:  292-7     Citation Subset:  IM    
Affiliation:
Department of Anesthesia and Perioperative Medicine, London Health Sciences Centre, University of Western Ontario, London, Ontario, Canada. Ravi.Taneja@lhsc.on.ca
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