ECG library
Sinus bradycardia
introA 24-year-old rower at a pre-participation physical. Asymptomatic.
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
- Rate below 60 with normal P-QRS relationship
- Every interval proportionally relaxed
Learning points
- The question is never the number alone: symptoms, medications (beta blockade), and conditioning decide its meaning.
- Nocturnal rates in the 30s are common in the young and fit.
Connected