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检测４４例原因不明室性早搏患者血清ｃｏｘｓａｃｋｉｅＢ病毒中和抗体（ＣＢＶＮＴ），同时对其中２３例进行心内膜心肌活检（ＥＭＢ），并分析室性早搏的起源部位、Ｌｏｗｎ分级，２４ｈ室早总数、ＱＲＳ波间期、ＱＲＳ波振幅。结果显示：ＥＭＢ心肌有病变与正常的室早ＱＲＳ波间期、ＱＲＳ波振幅有显著性差别（Ｐ＜０．０５），但室早起源部位、Ｌｏｗｎ级别、２４ｈ室早总数无显著性差别（Ｐ＞０．０５）。ＣＢＶＮＴ是否阳性与宝早起源部位、Ｌｏｗｎ级别、２４ｈ室早总数、ＱＲＳ波间期、ＱＲＳ波振幅均无关（Ｐ＞０．０５）。
44 cases of unexplained premature ventricular contractions in patients with serum coxsackieB virus neutralizing antibody (CBVNT), while 23 cases of endomyocardial biopsy (EMB), and analysis of the origin of premature ventricular contractions, Lown classification, 24h early total number , QRS wave interval, QRS wave amplitude. The results showed that there was a significant difference in the amplitude of QRS wave and QRS wave between EMB lesion and normal ventricular myocardium (P <0.05), but there was no significant difference in the early origin, Lown and 24h P> 0.05). The positive rate of CBVNT was not related to the site of prolapse, Lown level, early total 24h, QRS wave interval and QRS amplitude (P> 0.05).