Multifocal Atrial Tachycardia

Rate	100-250/bpm
P wave	two or more ectopic P waves with different morphologies
QRS	normal
Conduction	P-R intervals vary
Rhythm	irregular

Multifocal atrial tachycardia (MAT) may resemble atrial fibrillation or flutter.

It almost always occurs in seriously ill, elderly individuals. COPD is the most common underlying cause.

Treatment depends upon the underlying cause.

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In MAT, all P waves are identical in morphology, and P-R intervals are constant