Application of ALCOCK Tube Ultrasound-guided Internal Pudendal Nerve Block in Postoperative Anal Analgesia

Background: While surgery is the most effective treatment for anorectal diseases, traditional anesthesia methods are increasingly regarded not suitable for the clinical needs of anorectal patients. Although pudendal nerve block can play a good analgesic role in the anal region, the traditional pudendal nerve block is performed under blind probing, which is inaccurate in positioning, has poor anesthesia effect, and causes many complications. Objectives: At present, ultrasound-guided pudendal nerve block for analgesia has emerged in clinical practice. Therefore, the present study aimed to investigate the analgesic effect of ALCOCK tube ultrasound-guided internal pudendal nerve block in anal surgery. Methods: A prospective study was conducted. A total of 134 patients who underwent anal surgery in Hangzhou Lin'an District First People's Hospital from May, 2021 to July, 2022 were divided into three categories according to mixed hemorrhoids, anal fistula, and anal fissure and randomly divided into control and experimental groups. The two groups were treated with corresponding surgical treatment, and the experimental group was treated with bilateral pudendal nerve block under the guidance of ALCOCK tube ultrasound at the end of the operation. The operation time, blood loss, initial postoperative pain time, and visual analogue scale, postoperative pain score at each time point, incidence of complications, and patient satisfaction were recorded and analyzed. Results: The operation time of the experimental group was significantly longer than that of the control group, the bleeding volume of anal fistula in the experimental group was more than the control group, the first pain time of anal fistula in the experimental group was higher than that of the control group. The first pain score of anal fistula in the experimental group was lower than that of the control group. Follow-up showed that the pain scores of anal fistula and anal fissure groups were inconsistent 48 h after surgery. The total incidence of adverse reactions was lower, and the patient satisfaction was higher in the experimental group than in the control group. Conclusion: The application of internal pudendal nerve block under the guidance of ALCOCK tube ultrasound in anal surgery has a good analgesic effect and high patient satisfaction, which is worthy of promotion.