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CASE REPORTS
JOURNAL ARTICLE
QRS complex widening due to loss of left bundle branch capture: pitfall of para-Hisian pacing.
Journal of Interventional Cardiac Electrophysiology : An International Journal of Arrhythmias and Pacing 2009 September
During para-Hisian pacing, widening of the paced QRS complex usually indicates loss of His bundle capture. We describe a patient without any accessory pathways in whom widening of the paced QRS complex occurred due to loss of left bundle branch capture during para-Hisian pacing. After initial widening of the QRS complex, further widening was observed due to loss of His bundle capture. With the initial QRS widening, the stimulus-atrial interval and retrograde atrial activation sequence were almost unchanged, so the findings mimicked retrograde conduction over an accessory pathway. This may be a pitfall of the para-Hisian pacing technique.
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