第22题: [单项选择]窦性P波正常的时限、振幅是() 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0.25mV,胸前导联小于0.20mV 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0.11s,肢体导联小于等于0.25mV,胸前导联小于等于0.15mV 参考答案:B 答案解析:窦性P波的正常时限应小于等于0.12s,时限大于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波的振幅为肢体导联小于等于0.25mV,胸前导联小于等于0.20mY。肢体导