During postoperative eight weeks, five SD rats died (2 females and 3 males) for rupture of bladder, while there was no significant difference in the death rate between male and female rats (P > 0.05).

• 术后8周内大鼠因膀胱破裂死亡5只(雌2雄3)；雌、雄大鼠死亡率比较无差异(P>0.；05)。