【单选题】【消耗次数：1】
下列哪项是气囊充气状态下的测量指标（ ）。
①
肛门残余压
②
肛门松弛率
③
直肠肛管压力差
④
肛门直肠抑制反射
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肛门直肠测压的步骤依次为（ ）。
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静息、收缩、模拟排便、咳嗽反射、充气试验
②
静息、咳嗽反射、收缩、模拟排便、充气试验
③
静息、模拟排便、收缩、充气试验、咳嗽反射
④
收缩、模拟排便、咳嗽反射、静息、充气试验
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疼痛多为隐痛
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排便前出现括约肌挛缩痛
③
排便后出现肛门隐痛可延续数小时
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排便时与排便后疼痛之间有间歇期
⑤
疼痛无规律
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