Arrhythmias & electrophysiology
An individualized criterion for left bundle branch capture in patients with a narrow QRS complex
Authors' conclusion
ΔV6RWPT could be an accurate individualized criterion for determining LBB capture with high sensitivity and specificity and was superior over the fixed Paced-V6RWPT criterion.
Study context
- Population
- Patients with a narrow QRS complex in whom both LBBP and LV septal pacing were acquired during operation
- Participants
- 71 patients
- Comparison
- ΔV6RWPT criterion vs fixed Paced-V6RWPT criterion for left bundle branch (LBB) capture
- Outcome
- Accuracy of ΔV6RWPT criterion for determining LBBP
Performance
As reported in the abstract
Determination of LBBP
| Test or model | Sensitivity | Specificity | Optimal cutoff |
|---|---|---|---|
| ΔV6RWPT <30 ms | 100% | 100% | |
| Paced-V6RWPT | 84.5% | 97.2% | 64.2 ms |
Sensitivity
ΔV6RWPT <30 ms100%
Paced-V6RWPT84.5%
Specificity
ΔV6RWPT <30 ms100%
Paced-V6RWPT97.2%
Optimal cutoff
ΔV6RWPT <30 ms— not stated in the abstract
Paced-V6RWPT64.2 ms
Further findings
| Outcome | LBBP | LVSP |
|---|---|---|
| ΔV6RWPT during LBBP vs LVSP | 21.3 (SD 4.6) ms | 38.5 (SD 4.6) ms |
| Range | 9.3-28.3 ms | 31.1-47.0 ms |
ΔV6RWPT during LBBP vs LVSP
- Probability distribution of ΔV6RWPT well separated between LBBP and LVSP
Paced-V6RWPT during LBBP vs LBBpo-V6RWPT
- Paced-V6RWPT during LBBP equivalent to LBBpo-V6RWPT in all patients
Correlation of Native-V6RWPT with LBBpo-V6RWPT
- Strong linear correlation
- r = 0.796; P <.001
Original publication
An individualized criterion for left bundle branch capture in patients with a narrow QRS complex. Heart Rhythm. Published 10 November 2023. doi:10.
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