PMC5968778_01
ECG (QRS 116 ms) at rest before CRT.. Abbreviations: CRT, cardiac resynchronization therapy; ECG, echocardiogram.
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The electrocardiogram showed sinus rhythm with incomplete LBBB (QRS interval of 116 ms, Figure 1).
ECG (QRS 135 ms) demonstrating LBBB during stress before CRT.. Abbreviations: CRT, cardiac resynchronization therapy; ECG, echocardiogram; LBBB, left bundle branch block.
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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).