目的 探讨在外痔剥离术联合铜离子电化学治疗术的基础上采用后正中位肛门内括约肌部分离断术治疗混合痔的临床应用价值。方法 选取2020年3月—2023年8月收治的80例混合痔病例为研究对象,按随机数字表法分为对照组与观察组（各40例）,对照组采用外痔剥离术联合铜离子电化学治疗术,观察组在对照组治疗方法的基础上采用后正中位肛门内括约肌部分离断术,比较两组患者手术前后的肛管功能和术后复发率。结果 术前肛管最大收缩压和肛管静息压在两组患者间的差异均无统计学意义（P>0.05）;术后1个月,观察组上述指标均低于对照组（P<0.05）。术后观察组仅1例复发,对照组有8例复发,观察组复发率明显低于对照组（P<0.05）。结论 在外痔剥离术联合铜离子电化学治疗术的基础上采用后正中位肛门内括约肌部分离断术治疗混合痔可以有效改善患者肛管功能,降低术后复发风险。

Objective To investigate the clinical application value of posterior median anal sphincter partial dissection based on external hemorrhoid dissection combined with copper ion electrochemical therapy in the treatment of mixed hemorrhoids. Methods A total of 80 patients with mixed hemorrhoids treated from March 2020 to August 2023 were selected as study subjects, and divided into a control group and an observation group according to the random number table method, with 40 cases in each group. The control group was treated with external hemorrhoid dissection combined with copper ion electrochemical therapy, while the observation group was treated with posterior median anal sphincter partial dissection on the basis of the control group. The anorectal function before and after surgery and recurrence rate were compared between the two groups. Results Before surgery, there were no significant differences between the two groups in maximum anal systolic pressure and resting anal pressure （P>0.05）. One month after surgery, the observation group showed lower levels of maximum anal systolic pressure and resting anal pressure compared to the control group （P<0.05）. The recurrence rate in the observation group （1 case） was lower than that in the control group （8 cases） （P<0.05）. Conclusion On the basis of external hemorrhoid dissection combined with copper ion electrochemical therapy, the use of posterior median anal sphincter partial dissection can effectively improve anal function and reduce the risk of recurrence in patients with mixed hemorrhoids.