ECG library
RBBB with first-degree AV block
advancedA 77-year-old with unexplained syncope. The ECG is 'only showing blocks'.
25 mm/s · 10 mm/mV · synthetic tracing
100%
Calipers:2000 ms50.0 small boxes30 bpm if R-RDrag the orange markers. One small box = 40 ms.
Key findings
- Long PR and wide QRS together
- RBBB morphology
- Syncope makes this combination sinister
Learning points
- Multiple conduction abnormalities in a fainter raise the stakes: the next failure may be complete block.
- The pattern is a syncope workup finding, not an incidental one.
Connected