目的:通过突发晕厥心律失常病例分析,探讨早发现、识别、纠正恶性心律失常的重要性。方法:心电图、心电监护及实验室相关检查。结果:本例体表心电图多导联出现异常J波,后续出现心室颤动和多形性室速,经电击除颤及经静脉滴注利多卡因及激化液后J波逐渐变小,T波开始直立。恶性心律失常未再发生。结论:异常J波是与室颤,多形性室速相关的一种心电现象。对于体表心电图上出现异常高大J波的病例,不论患者有无严重的临床症状,均应高度警惕致命性心律失常的发生。 OBJECTIVE: To explore the importance of early detection, identification and correction of malignant arrhythmias by means of case analysis of sudden syncope arrhythmias. Methods: ECG, ECG monitoring and laboratory tests. Results: In this case, abnormal J-wave appeared on the multi-lead of body surface ECG, followed by ventricular fibrillation and pleomorphic ventricular tachycardia. After defibrillation and intravenous drip, the J-wave gradually became smaller and T wave Start upright. Malignant arrhythmias did not recur. Conclusion: Abnormal J wave is an electrocardiogram associated with ventricular fibrillation and pleomorphic VT. For the abnormal appearance of J-wave surface ECG cases, regardless of whether patients with serious clinical symptoms, should be highly vigilant fatal arrhythmia.