Please click here to obtain permission to reproduce this image.
Click on image to view larger version.
Figure 2 Ectopic P-wave morphology before (A) and after (B) QRST subtraction. (a) Shows the amplitude of subtracted P-wave in lead I and avL  50 µV and high-amplitude (100 µV) P-wave in lead II with the amplitude ratio of lead III/II <0.8, suggesting right superior pulmonary vein (PV) origin. (b) Shows an ectopic P-wave, which is positive in lead I and avL (50 µV) and low-amplitude (<100 µV) P-wave in lead II, suggesting right inferior PV origin. (c) Shows flat P-wave in lead I, avL and broad, notched, low-amplitude P-wave in lead II, with the amplitude ratio of lead III/II >0.8, suggesting left inferior PV origin. Intracardiac mapping and ablation were confirmatory.
|
