RESUMEN
Decreased left atrial appendage velocity (LAAV) is considered a significant risk factor thrombus formation in the left atrial appendage (LAA). The aim of this study was to assess the role of echocardiographic left atrial (LA) function parameters in predicting LAAV in patients with persistent atrial fibrillation (AF) undergoing catheter ablation. We prospectively enrolled consecutive patients with persistent AF undergoing transesophageal echocardiography (TEE) directly before the first AF ablation in 2019-2022. Of the 150 patients enrolled in the study, 29.3% (n = 44) had reduced LAAV values defined as < 25 cm/s. Patients with decreased LAAV values exhibited significantly reduced left atrial reservoir and conduit strain (LASr and LAScd), LA emptying fraction, and average e' values. This group also presented with a high LA stiffness index (LASI), high LA and right atrial area, and high LA volume index (LAVI) and E/e' ratio. In multivariable logistic regression analysis, LASI and LAVI remained significant predictors of the reduced LAAV. The threshold values were 1.6 for LASI and 44.47 ml/m2 for LAVI, with area under the curve values of 0.809 and 0.755, respectively. Among all noninvasive echocardiographic parameters, LASI and LAVI were found to be the best predictors of reduced LAAV, with good sensitivity and specificity. Moreover, LASI was found to be the only significant predictor of reduced LAAV defined as < 20 cm/s as well as < 25 cm/s.