Conclusion
Direct left bundle branch pacing has become a subject of interest as a
novel means for ventricular stimulation and possibly cardiac
resynchronization therapy5. Certain technical
characteristics of this method may be complimentary to His bundle
pacing. We describe the first case of worsening cardiac function and
progressive CHF most likely attributable to direct left bundle branch
pacing, both eventually corrected by the addition of the standard left
ventricular pacing lead. Long term follow up series of direct left
bundle branch pacing will be required to confirm the sustained benefit
with this new modality.