[问答题,案例分析题]

背景资料

产妇行硬膜外穿刺易误入血管的最主要原因() ["A．硬膜外间隙血管怒张","B．高血压","C．硬膜外间隙狭窄","D．脊椎弯曲度改变","E．孕激素水平升高"] 背景资料 婴儿腹泻发生低钙血症的原因错误的是() ["A．大便丢失钙","B．合并活动性佝偻病","C．酸中毒是离子钙减少","D．输液后血钙被稀释","E．进食少，吸收不良"] 预防产妇误吸，术前禁食至少多少小时() ["A．3","B．4","C．5","D．7","E．6"] 背景资料

背景资料