ECG library
Atrial flutter with 2:1 conduction
coreA 68-year-old with COPD, 'regular palpitations' at exactly 150.
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
- A regular narrow tachycardia at almost exactly 150
- Sawtooth baseline inferiorly
Learning points
- 150 is the number that should whisper 'flutter with 2:1' every time.
- Vagal maneuvers or AV nodal blockade unmask the sawtooth by increasing block.
Connected