Variable P waves

Variable P waves occur when there are P waves of different shapes seen in the same lead. This is caused by multiple ectopic pacemakers acting at once. If there are 3 or more different P wave shapes in one lead the rhythm may be multifocal atrial rhythm. Or, it may be multifocal atrial tachycardia if the rate is fast.

See also: P wave

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In the ECGquest archives, this ECG has been tagged with: - Chest pain 12-Lead Variable P waves Wandering atrial pacemaker ECG Interpretation CC-BY-NC-SA
ECG Blog #155 (Arrhythmia – PACs – Wandering – MAT )

This ECG is from a woman in her 50s who presented with intermittent chest discomfort in recent weeks.

In the ECGquest archives, this ECG has been tagged with: - 12-Lead Incorrect Machine Interpretation Variable P waves Sinus arrhythmia Wandering atrial pacemaker Dr Smith's ECG Blog CC BY-NC
Beware Automated Interpretations of Atrial Fibrillation!

This ECG is from a patient of unknown age. The computer interpretation was Atrial Fibrillation.