ECG library
Right bundle branch block
core25 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
- QRS ≥ 120 ms
- rSR' ('rabbit ears') in V1
- Wide S in lateral leads
Learning points
- RBBB leaves the early QRS untouched, so infarction Q waves remain readable.
- New RBBB with hypoxia and tachycardia should raise pulmonary embolism.
Connected