问题:
A . 时限小于等于0.10s,肢体导联大于等于0.25mV,胸前导联小于等于0.20mV
B . 时限小于等于0.12s,肢体导联小于0.20mV,胸前导联小于0.25mV
C . 时限小于0.10s,肢体导联小于等于0.25mV,胸前导联小于等于0.25mV
D . 时限小于0.11s,肢体导联小于等于0.25mV,胸前导联小于等于0.20mV
E . 小于等于0.1ls,肢体导联小于等于0.25mV,胸前导联小于等于0.15mV
● 参考解析
窦性P波的正常时限应小于等于0.11s,时大于0.12s为异常。P波时限的延长多见于心房扩大,或房间传导延迟。正常窦性P波的振幅为肢导联小于等于0.25mV,胸前导联小于等于0.15mV。肢体导联Ⅱ、Ⅲ、aⅦ大于0.25mV时,称肺性P波。
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