Atrial & SVT · Watch
Supraventricular Tachycardia
● Live · lead II25 mm/s · 10 mm/mV
II
10-second rhythm strip · count the boxes
Rate150–250 bpm
RegularityVery regular
P wavesUsually hidden in QRS or retrograde after QRS
PR intervalNot measurable
QRSNarrow
Key features
- Abrupt onset and termination
- Clock-like regularity
- Pseudo-R′ in V1 or pseudo-S in II from retrograde P (AVNRT)