A position-related ventricular tachycardia originating from the moderator band: A case report and review of the literature.

We report a case of drug-refractory ventricular tachycardia (VT) triggered by left lateral and supine positions, with only one prior case reported. The patient's VT originated from the moderator band(MB) and occurred in the left lateral and supine positions, but stopped when in the right lateral position. Symptoms disappeared after the patient experienced catheter ablation targeting the head end of the MB. We found that the clinical characteristics of VT originating from the MB could be manifested on electrocardiogram. The mechanism of posture-induced VT may be related to the effect of ventricular pressure on calcium channels and may be related to the age of the patient.