[A case of polymyositis with ventricular tachycardia].

We reported a case of polymyositis with ventricular tachycardia. She had been suffering from proximal dominant muscle weakness and palpitation for 11 months. Holter EKG demonstrated 23 beats ventricular tachycardia. The noninvasive cardiac examination (Thalium cardiac scintigraphy, echocardiography, radionuclide ventriculography) demonstrated no abnormal findings. After initiation of steroid therapy, muscle strength and CK improved and ventricular tachycardia disappeared. Ventricular tachycardia is one of the important complications of polymyositis.