Atrial Tachycardia

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Atrial tachycardia, or focal atrial tachycardia, is result of a micro-reentrant circuit or an automatic focus. The atrial rate is greater than 100 bpm.

Examples

ECG Showing Atrial Tachycardia

Atrial Tachycardia

The normal P wave axis is down in lead V1 and up in lead II. The abnormal P wave axis in this ECG reveals an ectopic atrial source.

References

  1. Link MS. Evaluation and Initial Treatment of Supraventricular Tachycardia. New England Journal of Medicine. 2012;367(15):1438-1448.