不同动力神经根在膀胱功能重建时作用的比较

Comparison of different dynamic anterior roots on bladder functional reconstruction

目的比较L5与S2前根作为动力神经根,对恢复膀胱的神经支配功能和重建排尿功能的作用。方法家犬5只,实验侧行L5-S2前根硬膜外交叉吻接,对照侧行S2-S2前根硬膜外自身吻接,术后1年分别电刺激实验侧和对照侧吻接口的中枢端,记录膀胱压和尿道压的变化。结果L5与S2前根都与膀胱逼尿肌和括约肌建立了神经联系。电刺激测压示:膀胱压实验侧(5.0±2.1)kPa与对照侧(4.6±1.8)kPa相比,差异无显著性意义(P=0.17);尿道压实验侧(4.2±1.7)kPa与对照侧(4.4±1.6)kPa相比,差异也无显著性意义(P=0.31)。结论脊髓损伤后膀胱因失神经支配而发生排尿功能障碍时,应用躯体运动性的L5前根与内脏副交感性的S2前根作为动力神经根来恢复膀胱神经的再支配和膀胱功能重建时,两者作用无明显区别。

Objective To compare L 5 anterior roots which is mostly composed of somatic motor nerve fibers and S2 anterior roots which is mostly composed of parasympathetic nerve fibers as dynamic nerve on bladder reinnervation and functional reconstruction after spinal cord injury. Methods Randomly select one side as experimental side and the other side as control, then L 5-S2 anterior roots cross extrameningeal anastomosis in the experimental side and S2-S2 self extrameningeal anastomosis in the control side were performed in 5 dogs. The changes of bladder pressure, urethral pressure responsed to electrical stimulation of the anastomosis roots on each side were recorded in the mean time and the two groups data were compared after one year. Results There were no significant difference between the changes of bladder pressure, urethral pressure responded to the stimulation of left side and right sides anterior roots as the anastomosis operation performed. After one year, both of experimental sides L 5 and control sides S2 anterior roots established neural relationship with bladder detrusor and urethral sphincter. There were no significant difference in the change of bladder pressure responded to electrical stimulation of the anastomosis roots between experimental side (5.0±2.1) kPa and control side (4.6±1.8) kPa(P=0.17) as well. The change of urethral pressure responded to electrical stimulation of the anastomosis roots between experimental side (4.2±1.7)kPa and control side (4.4±1.6)kPa also has no significant difference(P=0.31). Conclusion In the treatment of bladder dysfunction after spinal cord injury, L 5 anterior root can serve a similar role as S2 on bladder functional reconstruction as a dynamic nerve.