ECG library
High-grade AV block
advancedAn 84-year-old with presyncope on the stairs; a strip full of unconducted P waves.
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
- Two or more consecutive dropped beats
- Constant PR on conducted beats
- Slow ventricular rate
Learning points
- High-grade block sits between Mobitz II and complete block and shares their pacemaker indication.
- Atropine rarely helps infranodal disease; pacing pads on early.
Connected