Radiofrequency catheter ablation of ventricular tachycardia in a patient with dermatomyositis

Dermatomyositis is an idiopathic systemic inflammatory disorder that rarely affects the cardiac muscles. It has shown to be associated with various arrhythmias frequently manifesting as conduction disturbances. There are few case reports regarding dermatomyositis and ventricular tachyarrhythmias. Moreover, data regarding clinical experiences and outcome of radiofrequency catheter ablation (RFCA) for ventricular tachycardia (VT) in dermatomyositis is limited. We report a 51-year old male patient with dermatomyositis presented at our hospital for recurrent palpitation caused by VT.The VT was isoproterenol-triggered, adenosine-suppressed, and focally originating from the posteroinferior right ventricular septal area. The most likely mechanism is abnormal automaticity. A successful 3D-electroanatomical mapping-guided RFCA at the earliest activation sites cured VTs with no recurrence. It suggests that RFCA is safe and effective for focal VTs in dermatomyositis patients.