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Color Doppler tissue imaging to evaluate left atrial appendage function in mitral stenosis
Namik Kemal Eryol1, Ramazan Topsakal, Burhanettin Kiranatli
1Erciyes University of Medical School, Department of Cardiology, Kayseri, Turkey. nkeryol@erciyes.edu.tr
Echocardiography (Mount Kisco, N.Y.)
|July 10, 2003
Summary
Two-dimensional color Doppler tissue imaging (CDTI) reproducibly measures left atrial appendage (LAA) peak systolic velocity (PSV). Decreased PSV indicates poor LAA function and may predict thromboembolism.
Area of Science:
- Cardiology
- Medical Imaging
- Echocardiography
Background:
- Two-dimensional color Doppler tissue imaging (CDTI) is typically used for ventricular function assessment.
- The left atrial appendage (LAA) plays a crucial role in cardiac function and thromboembolism risk.
Purpose of the Study:
- To evaluate the reproducibility of measuring LAA tissue velocity using CDTI.
- To determine if LAA tissue velocity predicts LAA function and history of thromboembolism.
Main Methods:
- Thirty-six patients with mitral stenosis underwent transesophageal echocardiography with CDTI.
- Peak systolic velocity (PSV) at the LAA tip was measured, along with LAA emptying and filling velocities.
- Interobserver and intraobserver variabilities were assessed; LAA ejection fraction was calculated.
Main Results:
- CDTI demonstrated good intraobserver (r=0.64) and interobserver (r=0.60) reproducibility for PSV.
- Decreased PSV (<0.05 m/sec) was significantly associated with reduced LAA emptying velocity and LAA ejection fraction, even after covariate adjustment.
- Decreased PSV correlated with low LAA emptying velocity and a history of thromboembolism, and was a significant determinant of low LAA emptying velocity.
Conclusions:
- CDTI offers a reproducible method for quantifying LAA contraction.
- Reduced LAA peak systolic velocity is a potential indicator of impaired LAA function.