Multifocal atrial tachycardia frequently occurs in the setting of severe lung disease and, more specifically, during an exacerbation of lung disease. This rhythm is benign, and once the underlying ...

Multifocal atrial tachycardia — or MAT — is a rhythm that frequently occurs in ... P-wave morphologies within one 10-second 12-lead ECG at a heart rate > 100 beats per minute.