Introduction Ventricular tachycardias although they may be irregular at the onset, after several seconds they organize into a stable cycle length. Methods/Results We report a rare case of an “irregular ventricular tachycardia” in which the oscillations in cycle length were so pronounced that it was initially misdiagnosed as atrial fibrillation with aberrant conduction. The initial pharmacological management and detained electrophysiological study are presented. Conclusion An unusual irregular ventricular tachycardia can originate from the moderator band and result in a tachycardia induced cardiomyopathy