摘要:
Objective To explore the erectile function preservational mechanism of Non-transecting urethroplasty(NTU) for posterior urethral stricture.Methods From May 2012 to September 2016,62 patients with posterior urethral stricture,who were treated with NTU,were enrolled in this study.The mean age was 37.5 years old,ranging 18-48 years old.The causes were pelvic fracture urethral injury in 53 cases and iatrogenic injury in 9 cases.Preoperative urethrography and urethroscopy revealed the strictures located in posterior urethra,which was at the distal of verumontanum.The mean length of stricture was 2.1 cm,ranging 0.5-2.5 cm.The average period between trauma and surgery was 6.4 months,ranging 3 months-2 years.All patients had no previous history of urethroplasty.Their sexual hormones were in normal level.Among those patients,the IIEF-5 scores were more than 12 and number of events during NPT test were more than twice.Finally,43 cases were underwent NTU and 19 cases accepted inferior pubectomy (IP)+ NTU.All patients had a general anesthesia.The bulbar urethra was mobilized dorsally from the tunica albuginea of the corpora cavernosa and then extended proximally up toward the perineal membrane.Scar tissue surrounding the urethra was excised and inferior pubectomy (IP) was performed as a supplemental technique to keep the suturing position without tension.The ventral hemi-circumference was then sutured with interrupted 4-0 polyglycolic sutures with tension-free anastomosis.The 18-Fr indwelling catheter was inserted.Result Average follow-up was 20.2 months,ranged from 12 to 36 months.In NTU group,NPT test revealed no significant difference in number of events (2.7 ± 0.7 vs.3.0 ± 1.0,P > 0.05),duration of best episode [(16.4 ± 3.5) min vs.(16.4 ± 3.8) min,P > 0.05)] or tip rigidity [(31.2 ± 4.7) % vs.(30.8 ± 3.5) %,P > 0.05)] between pre-and post-operation,respectively.The IIEF-5 score (19.7 ± 1.9 vs.20.4±2.1,P<0.05)and Qmax[(8.7 ±4.0)ml/s vs.(25.5 ±4.7)ml/s,P<0.05)] increased significant pre-and post-operation,respectively.In IP + NTU group,Qmax [(8.4 ± 4.4) ml/s vs.(23.1 ± 3.5)ml/s,P < 0.05)] increased significant pre and post operation.The NPT test revealed slight decrease in number of events(2.3 ± 0.6 vs.1.6 ± 1.0,P < 0.05),duration of best episode [(15.6 ± 2.4) min vs.(14.5±2.4)min,P<0.05)] or tip rigidity [(29.8±3.0)% vs.(25.6 ±7.1)%,P<0.05)] between pre-and post-operation,respectively.However,the IIEF-5 scores (17.3 ± 1.6 vs.16.5 ± 2.1,P < 0.05) didn't show significant difference pre-and post-operation.Stricture recurrence occurred in 3 patients,the success rate was 95.2% (59/62) during 12 months following.Conclusion NTU is not only a safe and promising procedure for posterior urethral stricture less than 2.5cm,but also a new minimally invasive approach to preserve erectile function.%目的 探讨不离断尿道成形术(non-transecting urethroplasty,NTU)在后尿道狭窄治疗中对勃起功能的保护作用及机制.方法 回顾性分析2012年5月至2016年9月采用NTU治疗的62例后尿道狭窄患者的病例资料.年龄19 ~ 50岁,平均34.7岁.病因为骨盆骨折致后尿道狭窄53例,医源性后尿道狭窄9例.术前均行尿道造影及尿道镜检查证实狭窄位于后尿道精阜前,狭窄段长0.5~2.5 cm,平均2.1 cm.伤后时间3个月~2年,平均6.4个月.所有患者既往无尿道成形术史.术前血清性激素水平正常,未服用5型磷酸二酯酶抑制剂或停用>2周.术前国际勃起功能(IIEF-5)评分均≥12分,夜间勃起功能检查(NPT)示夜间勃起次数均≥2次.根据手术方式将患者分为NTU组(仅行NTU术)43例和耻骨下缘凿除[患者因狭窄位置较深,术中先行耻骨下缘凿除(IP)]+NTU组19例.NTU组和IP+ NTU组术前的夜间勃起次数分别为(2.7±0.7)次和(2.3±0.6)次,最佳勃起持续时间分别为(16.4±3.5)min和(15.6±2.4) min,阴茎头部最佳勃起硬度分别为(31.2±4.7)%和(29.8±3.0)%,IIEF-5评分分别为(19.7±1.9)分和(17.3±1.6)分,Qmax分别为(8.7±4.0)ml/s和(8.4 ±4.4) ml/s.所有手术均采用全麻,患者取截石位.作会阴倒“Y”形切口,逐层切开皮肤、球海绵体肌,分离出球部和阴囊部尿道、膜部尿道的背侧和两侧,在狭窄段尿道前背侧切开正常尿道1.5 cm,彻底切除尿道周围的瘢痕组织;用4-0可吸收线无张力横行缝合扩大尿道腔.结果术后随访12 ~ 36个月,平均20.2个月.术后12个月NTU组夜间勃起次数(3.0±1.0)次(t=-1.46,P>0.05),最佳勃起持续时间(16.4 ±3.8)min(t =0.18,P>0.05),阴茎头部最佳勃起硬度(30.8±3.5)%(=0.58,P>0.05),与术前比较差异均无统计学意义;IIEF-5评分(20.4±2.1)分(t=-2.11,P<0.05),Qmax (25.5±4.7) ml/s(t=-17.30,P<0.05),与术前比较差异均有统计学意义.术后12个月IP+ NTU组夜间勃起次数(1.6±1.0)次(t=3.37,P<0.05),最佳勃起持续时间(14.5 ±2.4)min(t =2.13,P<0.05),阴茎头部最佳勃起硬度(25.6±7.1)%(t=2.58,P<0.05),Qmax(23.1±3.5)ml/s(t=--12.35,P<0.05),与术前比较差异均有统计学意义;IIEF-5评分(16.5±2.1)分(t=1.76,P>0.05),与术前比较差异无统计学意义.随访中3例复发尿道狭窄,手术成功率为95.2% (59/62).结论 采用NTU处理狭窄长度≤2.5 cm后尿道狭窄时可达到传统手术的效果,术中可减轻尿道海绵体血管及神经损伤,对患者勃起功能有一定的保护作用.