ECG library
Second-degree AV block, Mobitz II
advanced25 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
- Dropped beats without PR prolongation
- Wide QRS
- No warning before the drop
Learning points
- Mobitz II fails without warning and can fall into complete heart block; it earns pacing.
- The PR that never changes is what separates it from Wenckebach.
Connected