Valvular & structural heart disease
Prevalence and clinical significance of masquerading bundle branch block in patients undergoing transcatheter aortic valve replacement: Insights from a single-center registry
Authors' conclusion
MBBB is not rare in TAVR candidates, occurring in approximately 8% of pre-TAVR ECGs labeled as RBBB.
Study context
- Population
- Consecutive TAVR patients, single-centre database, 2010–2023of 1085 screened
- Participants
- 980 patients
- Exposure
- Masquerading bundle branch block (MBBB) vs right bundle branch block (RBBB) vs Left bundle branch block
- MBBBn = 13
- RBBBn = 151reference
- Left bundle branch blockn = 158
- Outcome
- Prevalence of MBBB on pre-TAVR ECG and pacemaker implantation
- Follow-up
- Within 30 days
Methodological detailssingle-centre, registry, consecutive patients, blinded electrocardiographic (ECG) classification
- Single-centre
- Registry
- Consecutive patients
- Blinded ECG classification
Main finding
As reported in the abstract
Prevalence of conduction abnormalities on pre-TAVR ECG
- All MBBB cases initially mislabelled as RBBB, share of that group
- 7.9%
Observational data: associations, not effects.
Further findings
| Outcome | MBBB | RBBB |
|---|---|---|
| Early pacemaker implantation · within 30 days | 92.5% | 44.3% |
- Early pacemaker implantation — All patients
- 166 (16.9%)
- Death or HF hospitalisation (MBBB) · 1 year after TAVR
- 38%
Original publication
Prevalence and clinical significance of masquerading bundle branch block in patients undergoing transcatheter aortic valve replacement: Insights from a single-center registry. Heart Rhythm. Published 6 November 2025. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →