Ventricular paced rhythm was detected on 12-lead ECG. The widespread opinion that this constellation does not permit a diagnosis of ischemia on 12-lead ECG is not accurate, as this example shows.

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