交替性即呈2:1间歇性规律出现的预激综合征较为少见,本文报告二例并作简要讨论。 例1,女,37岁,于1991年8月14日因心悸及胸闷10余日在某医院疑诊为病毒性心肌炎、频发性室早形成二联律,介绍来我院作进一步诊察,描记心电图,诊断为“B型预激综合征”,呈2:1间歇出现,即交替性预激综合征,可见各导联均呈现 Alternate that is 2: 1 intermittent regular occurrence of WPW syndrome is rare, the paper reports two cases and briefly discussed. Case 1, female, 37 years old, on August 14, 1991 due to heart palpitations and chest tightness more than 10 days in a hospital suspected of viral myocarditis, frequent premature ventricular formation of dual law, introduced to our hospital for further examination, Echocardiography was diagnosed as “B-pre-excitation syndrome”, appeared intermittently 2: 1, that is, the alternative pre-excitation syndrome, showing the leads were present