ECG RHYTHM LAB

Atrial Flutter · Variable Conduction

Organized atrial activity conducts in changing ratios to the ventricles.

Generated six-second Lead II example · 300 bpm target rate · not a patient recording.

Typical rate

Atrial: 250–350 bpm

Regularity

Irregular ventricular response

P waves

Continuous flutter waves

PR interval

Not measurable

QRS

Usually narrow

What to look for

The atrial sawtooth pattern stays organized while R–R intervals change by multiples of the atrial cycle.

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Sources and limitations