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Left ventricular lateral annulus and left atrial free-wall velocity time integral indicate thromboembolism in patients with rheumatic atrial fibrillation.
MedLine Citation:
PMID:  20546011     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
BACKGROUND: Low wall motion and stasis increase the likelihood of clot formation. We hypothesized that tissue Doppler indices of left atrial (LA) motion are reduced in the presence of LA thrombi and may be predictive for clot formation in patients with atrial fibrillation (AF).
METHODS: We did an observational study for 3 years in 118 patients with rheumatic mitral valve disease in chronic AF who had not received anticoagulation, with (Group 1, n = 36) and without (Group 2, n = 82) thromboembolism. Pulsed tissue Doppler systolic velocities and velocity time integrals (VTIs) were measured in all four chambers. A mean LA VTI was calculated. LA strain during ventricular systole was calculated using VTI and distance between two LA locations.
RESULTS: Logistic regression analysis showed that, after adjusting for age, gender, diabetes, hypertension, LA size, and left ventricular (LV) ejection fraction, mean LA VTI [Odds ratio (OR) 0.69, 95%CI (0.56-0.86, P = 0.03)] and lateral mitral annulus VTI [OR 0.15 (0.04-0.56, P = 0.03)] were associated with clot formation. The addition of these two parameters to the conventional risk factors increased the ability to predict thromboembolism (Nagelkerke R² = 0.32-0.50, P = 0.01; area under the curve 0.83 by receiver operating characteristic analysis, P = 0.01). LA strain also had potential to indicate clot formation (0.9 ± 13.8 vs. -8.2 ± 15.1%, group 1 vs. 2, respectively, P = 0.01).
CONCLUSION: Patients with chronic AF and thromboembolism have reduced LA and LV motion independently of LA size and LV ejection fraction. Tissue Doppler parameters may have potential to predict clot formation in these patients.
Authors:
Mark C Arokiaraj; Cristina Pislaru; Shanmugam Vellayappan; Sitalakshmi Subramanian; Kiron Varghese; Chandrakanth B Patil; Gurappa G Shetty; Cherian George; Vishal Gupta; Shamanna S Iyengar
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Echocardiography (Mount Kisco, N.Y.)     Volume:  27     ISSN:  1540-8175     ISO Abbreviation:  Echocardiography     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-11-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8511187     Medline TA:  Echocardiography     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1038-48     Citation Subset:  IM    
Copyright Information:
© 2010, Wiley Periodicals, Inc.
Affiliation:
Department of Cardiology, St. John's Medical College, Bangalore, Karnataka, India. markchristopher3@yahoo.co.in
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