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Echocardiography can record simultaneously the electrical and mechanical action of cardiac. The main purpose of this study was to evaluate whether tissue Doppler echocardiography could be a useful noninvasive method to describe atrial conduction characteristics of PAF patients.
90 patients with PAF and 70 control subjects were enrolled in our study. Echocardiography was performed after RFCA or at enrollment with sinus rhythm. Patients were followed for a median of 12 months, with the primary endpoint defined as recurrence. Atrial electromechanical conduction intervals, from the onset of P-wave to the onset of A-wave, were calculated from Tissue Doppler image on lateral and septal mitral and right ventricular tricuspid annuli. The differences between these intervals were defined as interatrial electromechanical delay time (IAEMD) and intra-right atrial electromechanical delay time (IREMD) and intra-left atrial electromechanical delay time (ILEMD).
Interatrial and intra-left atrial electromechanical delay time were higher in the PAF patients (P<0.05) and recurrence PAF patients after RFCA (P<0.05). In multivariate logistic regression analysis, ILEMD was found to be an independent parameter predicting the AF occurrence and recurrence after RFCA. ILCA of 20.5ms and 26ms were found to be cutoff values for the occurrence and recurrence of AF with a sensitivity and specificity of 84 and 78%, and 72 and 77%, respectively.
ILEMD detected by tissue Doppler echocardiography may be a useful parameter to describe atrial conduction characteristics of PAF patients and predicting their recurrence after successful RFCA.