case_images: PMC5968778_01
case_images: ECG (QRS 116 ms) at rest before CRT.. Abbreviations: CRT, cardiac resynchronization therapy; ECG, echocardiogram.
case_images: imcrj-11-121Fig1.jpg
case_images: PMC5968778_01_imcrj-11-121Fig1.jpg
case_images: f1-imcrj-11-121
case_images: The electrocardiogram showed sinus rhythm with incomplete LBBB (QRS interval of 116 ms, Figure 1).
case_images: ECG (QRS 135 ms) demonstrating LBBB during stress before CRT.. Abbreviations: CRT, cardiac resynchronization therapy; ECG, echocardiogram; LBBB, left bundle branch block.
case_images: imcrj-11-121Fig2.jpg
case_images: PMC5968778_01_imcrj-11-121Fig2.jpg
case_images: f2-imcrj-11-121
case_images: The RVSP reached 55 mmHg plus central venous pressure, and the QRS interval during the exercise widened from 116 ms to 135 ms (Figure 2).