The Clinical and Electrocardiographic Character of Idiopathic Abnormal J Wave and Brugada's Syndrome.

Objective To explore the clinical and electrocardiographic character of idiopathic abnormal J wave and Brugada's syndrome.Methods Eight cases with idiopathic abnormal J wave and eight cases with Brugada's syndrome were analyzed.Results 1.There was upright abnormal J wave in limb/or precordial leads in idiopathic abnormal J wave cases,except in lead aVR or aVL.The J wave was obviously lower and distributed more extensively than that in Brugada's syndrome.Generally there was no J wave in lead V1-V2,if J wave appeared,it was smaller than R wave.The T wave was usually upright and without right bundle branch block(RBBB) in leads V1-V3.2.In Brugada's syndrome,ST segment was elevation with slanting or saddle type accompanied with RBBB or RBBB-like,R' wave was higher than R wave in leads V1-V3 and T wave was often inversion or upright in leads V1-V3.In both instances,polymorphic ventricular tachycardia(PVT) and ventricular fibrillation(VF) were more often induced and led to death.Conclusions The idiopathic abnormal J wave is different from Brugada's syndrome in clinical and electrocardiographic character.