Atrial & SVT · Watch
Atrial Fibrillation
● Live · lead II25 mm/s · 10 mm/mV
II
10-second rhythm strip · count the boxes
RateAtrial 350–600; ventricular variable (RVR > 100)
RegularityIrregularly irregular
P wavesAbsent; fibrillatory (f) baseline
PR intervalNone
QRSNarrow (unless aberrancy or pre-excitation)
Key features
- No two R-R intervals alike
- Chaotic, wavy baseline with no discrete P waves
- Pulse deficit common at fast rates