Atrial flutter 4:1 conduction

See brief interpretation of 12 lead EKG above

- regular rhythm with ventricular rate 75 and narrow QRS complexes (≤ 120 ms)
- saw-toothed appearance in II, III, aVF (inferior leads)
- 4 flutter waves per QRS complex

The EKG above shows a narrow complex regular rhythm with a characteristic saw-toothed baseline best seen in inferior leads (II, III, aVF). The EKG is consistent with (typical) atrial flutter with 4:1 conduction, that is 4 flutter waves (F waves) per QRS complex. The flutter waves are more easily recognized than in atrial flutter with 2:1 conduction.

Please refer to the article outlining atrial flutter with 2:1 conduction for more information about rhythm recognition and the underlying mechanism in atrial flutter.

– Mathias