Abstract
Identifying patients at high risk of atrial fibrillation (AF) recurrence remains challenging. This study aimed to evaluate total atrial conduction time (TACT) and left atrial (LA) asynchrony as predictors of AF recurrence. Consecutive patients after the first AF episode, terminated either spontaneously or with cardioversion, underwent transthoracic echocardiography. TACT, estimated by the time delay between the onset of P-wave and the peak A′-wave on the Tissue Doppler Imaging (PA-TDI duration), atrial volumetric and functional parameters, and biatrial strain were assessed. We calculated mean PA-TDI—the average of PA-TDI measurements in all left atrial (LA) walls—and the difference between the longest and the shortest PA interval (DLS) and the standard deviation of 4 PA intervals (SD4) to assess the LA global remodeling and asynchrony, respectively. The primary endpoint was AF recurrence. Patients with recurrent AF had significantly prolonged PA-TDI intervals in each LA wall—and thus mean PA-TDI—than those without recurrence (mean PA-TDI: 157.4 ± 17.9 vs. 110.2 ± 7.7 ms, p < 0.001). At univariate analysis, LA maximum volume index, total LA emptying fraction, right atrial maximum volume index, PA-TDI, DLS, and SD4 were predictors of AF recurrence. At multivariable analysis, PA-TDI intervals in all LA walls remained strong predictors with mean PA-TDI (odds ratio 1.04; 95% confidence interval 1.03–1.06) having an optimal cutoff of 125.8 ms in receiver operator characteristics curve analysis providing 98% sensitivity and 100% specificity for AF recurrence (area under the curve = 0.989). PA-TDI was an independent predictor of AF recurrence and outperformed established echocardiographic parameters.
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Appendix
Appendix
All patients were imaged in left lateral decubitus position and the leads were placed in as possible identical positions. A 2D echocardiogram, including M-mode, Doppler (PW, CW and color) and TDI echocardiography were obtained in the parasternal short and long axis views.
LA volumes were obtained from the apical views by disc’s method and were indexed to body surface area (BSA) [32]. They were measured at three phases of cardiac cycle: 1. LA maximum volume at the end-systolic phase (just before mitral valve opening), 2. LA minimum volume at the end-diastolic phase (just before mitral valve closure) and 3. Volume before atrial active contraction, LA preA volume obtained from the last frame before mitral valve reopening or at time of the P wave on surface electrocardiography.
The LA function was assessed based on LA volumes by calculating the following equations: 1. Total atrial emptying fraction. 2. Active atrial emptying fraction: LA active ejection fraction, which is considered an index of LA active contraction. 3. Passive atrial emptying fraction, which is considered an index of LA conduit function; and 4. Atrial expansion index: LA expansion index, which is considered an index of LA reservoir function. Left ventricular ejection fraction (LVEF) was calculated from the standard apical 2- and 4-chamber views using the Simpson’s method.
Atrial Strain: The global and regional LA and RA strain was measured by 2D speckle tracking echocardiography (2DSTE). Recordings were processed with acoustic-tracking software (EchoPAC, GE Healthcare), allowing off line semi automated speckle tracking analysis. Along the LA and RA, the endocardium lines were manually traced. An additional epicardial line was generated automatically by the software, creating a region of interest (ROI). The ROI shape was manually adjusted, and the software divided the LA and RA region into six segments and generated the longitudinal strain curve. The zero strain point was set at the beginning of the P wave. Positive peak strain was measured during ventricular systole and negative peak strain during LA systole globally for each of the 12 segments. The total strain was the difference of positive peak strain and negative peak strain. Positive peak strain rate was measured during ventricular systole while early negative peak strain rate was measured during late diastole (see Tables 6, 7, 8, 9, 10, 11).
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Karantoumanis, I., Doundoulakis, I., Zafeiropoulos, S. et al. Atrial conduction time associated predictors of recurrent atrial fibrillation. Int J Cardiovasc Imaging 37, 1267–1277 (2021). https://doi.org/10.1007/s10554-020-02113-y
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DOI: https://doi.org/10.1007/s10554-020-02113-y