二度Ⅰ型房室传导阻滞的心电图特征是（） -题库考试答案搜索网

二度Ⅰ型房室传导阻滞的心电图特征是（）

单选题

2021-12-29 20:14

A、P-R间期进行性缩短，直至一个P波受阻不能下传到心室
B、相邻P-R间距进行性延长，直至一个P波受阻不能下传到心室
C、P-R间期进行性延长，直至一个P波受阻不能下传到心室
D、P-R间期>0.20秒，P波无受阻
E、P-R间期固定，P波间断受阻不能下传到心室

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试题解析

二度房室传导阻滞可分为两型。Ⅰ型又称文氏现象，或称莫氏Ⅰ型，Ⅱ型又称莫氏Ⅱ型。文氏现象特点：①P-R间期逐渐延长，直至P波受阻与心室脱漏，②R-R间期逐渐缩短，直至P波受阻；③包含受阻P波的R-R间期比两个P-P间期之和为短。莫氏Ⅱ型特点：①P－R间期固定，可正常或延长。②QRS波群有间期性脱漏，阻滞程度可经常变化，可为1：1；2：1；3：1；3：2；4：3等。下传的QRS波群多呈束支传导阻滞图型

标签：心律失常贵州住院医师急诊科心血管内科医学检验科住院医师

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