Figure 1

P-A′(M) and P-A′(T) intervals, measured as the time from initiation of the P wave on the ECG until the beginning of the late diastolic tissue Doppler imaging (TDI) signal at the lateral border of the mitral annulus (P-A′(M)) and tricuspid annulus (P-A′(T)). Interatrial dyssynchrony was defined as prolongation of the difference between the P-A′(M) and P-A′(T) interval (A′(M)-A′(T)).