Sinus · Watch
Sinus Bradycardia
● Live · lead II25 mm/s · 10 mm/mV
II
10-second rhythm strip · count the boxes
Rate< 60 bpm (symptoms usually < 50)
RegularityRegular
P wavesNormal, one per QRS
PR interval0.12–0.20 s
QRSNarrow
Key features
- Sinus morphology at a slow rate
- Common in athletes, during sleep, and with beta-blockers