以下为句子列表：
英文: Because spinal anesthesia blocks innervation of the bladder, administration large amounts of intravenous fluids may cause bladder distention, and a urethral catheter may be carried.
中文: 因脊髓麻醉阻滞了膀胱的神经支配，大量静脉输液会引起膀胱膨胀，因此可能需要插导尿管。
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英文: Methods: Sixty patients scheduled for spinal anesthesia were randomly allocated to four groups with each. Group Ⅰ and Ⅱ were adult patients aged from to years old and group Ⅲ and Ⅳ were geratic aged patients of 7 years old.
中文: 方法：0例ASAⅠ～ Ⅱ级择期手术病人根据年龄和是否预防性注射麻黄碱而分成四组，Ⅰ、Ⅱ组为～岁成年病人，Ⅲ、Ⅳ组为～7岁老年病人。
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