Transanal Intubation for Preventing Colorectal Anastomotic Failure.

Introduction: Failure of low colorectal anastomosis remains challenging in surgical oncology, necessitating the exploration of new methods and improvements in existing preventive measures. Materials and Methods: This prospective study was conducted in two stages: intraluminal pressure in the colon was monitored in 32 patients by manometry and sonography over a 5-day postoperative period; 213 patients who underwent anterior resection of the rectum were analyzed, of whom 126 and 87 underwent diverting stoma (DS) and transanal intubation (TAI), respectively. Results: The effectiveness of the recommended technique for applying and removing transanal intubation (TAI) to prevent pneumo hydro strike (≥15 kPa) on the anastomosis line was analyzed in 87 patients and compared with imposed DS. TAI showed better borderline statistical significance (p = 0.051). The incidence of repeat surgery for anastomotic failure (AL) was seven (5.55%) and four (4.59%) in the DS and TAI groups, respectively. The distance of the anastomosis from the dentate line <60 mm was associated with a higher risk of AL occurrence (odds ratio (OR), 1.012; 95% confidence interval (CI), 1.007-1.017; p < 0.001; area under the curve (AUC) = 0.82). DS is recommended for men, as the risk of AL is significantly lower among women (OR, 0.41; 95% CI, 0.16-1.04; p = 0.062; AUC, 0.61; 95% CI, 0.54-0.67). Conclusions: Although TAI is advantageous over DS for preventing AL, surgeons select the method for the preventive approach based on the preoperative and intraoperative results.

Quality of life and functional outcomes after laparoscopic total mesorectal excision (LaTME) and transanal total mesorectal excision (taTME) for rectal cancer. an updated meta-analysis.

PURPOSE: Concerns exist regarding the potential for transanal total mesorectal excision (TaTME) to yield poorer functional outcomes compared to laparoscopic TME (LaTME). The aim of this study is to assess the functional outcomes following taTME and LaTME, focusing on bowel, anorectal, and urogenital disorders and their impact on the patient's QoL. METHODS: A systematic review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines and A Measurement Tool to Assess systematic Reviews (AMSTAR) guidelines. A comprehensive search was conducted in Medline, Embase, Scopus, and Cochrane Library databases. The variables considered are: Low Anterior Resection Syndrome (LARS), International Prostate Symptom Score (IPSS) and Jorge-Wexner scales; European Organisation for Research and Treatment of Cancer (EORTC) QLQ-C29 and QLQ-C30 scales. RESULTS: Eleven studies involving 1020 patients (497-taTME group/ 523-LaTME group) were included. There was no significant difference between the treatments in terms of anorectal function: LARS (MD: 2.81, 95% CI: - 2.45-8.08, p = 0.3; I2 = 97%); Jorge-Wexner scale (MD: -1.3, 95% CI: -3.22-0.62, p = 0.19). EORTC QLQ C30/29 scores were similar between the groups. No significant differences were reported in terms of urogenital function: IPSS (MD: 0.0, 95% CI: - 1.49-1.49, p = 0.99; I2 = 72%). CONCLUSIONS: This review supports previous findings indicating that functional outcomes and QoL are similar for rectal cancer patients who underwent taTME or LaTME. Further research is needed to confirm these findings and understand the long-term impact of the functional sequelae of these surgical approaches.

Short-term outcomes of the "minimal skin incision and no stoma" procedure in needlescopic intersphincteric resection and delayed coloanal anastomosis for low rectal cancer.

BACKGROUND: Needlescopic surgery is a minimally invasive procedure that uses thin trocars with 3-mm diameter. We used Turnbull-Cutait pull-through and delayed coloanal anastomosis in needlescopic surgery to avoid diverting ileostomy during intersphincteric resection for low rectal cancer. In this study, we aim to assess the diverting ileostomy avoidance rate and technical safety of this "minimal skin incision and no stoma" procedure. METHODS: This single-center retrospective study was conducted at the Cancer Institute Hospital, a tertiary referral center in Japan. Between January 2017 and December 2020, 11 patients underwent needlescopic intersphincteric resection with diverting ileostomy (NSI group), and 19 patients underwent needlescopic intersphincteric resection with delayed coloanal anastomosis (NSD group) for low rectal cancer. Data regarding patient backgrounds and short-term outcomes, including diverting ileostomy avoidance rate, pathological results, and postoperative defecatory function, were compared between the groups. RESULTS: There were no statistically significant differences between the NSI and NSD groups with respect to patient background, operation time (239 min versus 220 min, p = 0.68), estimated blood loss (45 g versus 25 g, p = 0.29), R0 resection rate (100% versus 100%, p = 1.00), and length of postoperative hospital stay (16 days versus 17 days, p = 0.42). The diverting ileostomy avoidance rate was 94.4% in the NSD group. The LARS and Wexner scores 12 months after surgery were not significantly different between the two groups. CONCLUSIONS: Needlescopic intersphincteric resection and delayed coloanal anastomosis can be safely performed in selected patients with a high rate of diverting ileostomy avoidance and comparable short-term outcomes.

Perianal disease in inflammatory bowel disease: Broadening treatment and surveillance strategies for anal cancer.

The perianal disease affects up to one-third of individuals with Crohn's disease (CD), causing disabling symptoms and significant impairment in quality of life, particularly for those with perianal fistulising CD (PFCD). The collaborative effort between gastroenterologists and surgeons is essential for addressing PFCD to achieve fistula closure and promote luminal healing. Limited fistula healing rates with conventional therapies have prompted the emergence of new biological agents, endoscopic procedures and surgical techniques that show promising results. Among these, mesenchymal stem cells injection is a particularly hopeful therapy. In addition to the burden of fistulas, individuals with perianal CD may face an increased risk of developing anal cancer. This underscores the importance of surveillance programmes and timely interventions to prevent late diagnoses and poor outcomes. Currently, there is no established formal anal screening programme. In this review, we provide an overview of the current state of the art in managing PFCD, including novel medical, endoscopic and surgical approaches. The discussion also focuses on the relevance of establishing an anal cancer screening programme in CD, intending to propose a risk-based surveillance algorithm. The validation of this surveillance programme would be a significant step forward in improving patient care and outcomes.

Treatment of anal fistulas with Obsidian RFT®: just another autologous compound platelet-rich fibrin foam?

BACKGROUND: Sphincter-preserving techniques like autologous compound platelet-rich fibrin foam have gained popularity, offering potential for better functional outcomes in anal fistula treatment. The present study aimed to evaluate the efficacy and safety of Obsidian RFT®. METHODS: The study conducted a retrospective analysis from January 2018 to December 2022 on patients who received anal fistula closure with Obsidian RTF® at the Department of General Surgery, Medical University of Vienna. Clinical diagnosis, complemented by radiographic imaging, was employed to confirm inconclusive cases. Demographic and fistula characteristics and postoperative data were collected from electronic records following STROCSS criteria. RESULTS: Fifteen patients received Obsidian RFT® treatment for anal fistulas. We found no intra- and postoperative complications. The median hospital stay was 3 days. After a median follow-up of 32 months, a closure rate of 53.3% was detected. Non-significant differences were observed in various variables, yet trends emerged, indicating associations between abscess presence and non-healing fistulas. A distinct age threshold (≥ 42.7 years) served as an indicator for an inability to achieve anal fistula cure. CONCLUSION: Obsidian RFT® represents a safe, minimally invasive operative procedure. Approximately half the patients experienced healing, with better outcome in a younger population. TRIAL REGISTRATION: Ethical Approval number Medical University of Vienna (#1258/2018). This study was registered retrospectively in ClinicalTrials.gov (NCT06136325).

Transanal total mesorectal excision: short- and long-term results of four certified colorectal cancer centers in Germany.

BACKGROUND: Transanal total mesorectal excision (TaTME), a novel approach for treating low rectal cancer, holds promise. However, concerns exist in certain countries about their oncologic safety due to less-than-optimal outcomes on global studies. This research seeks to evaluate the long-term oncologic outcomes focusing on local recurrence rate and overall survival after TaTME surgery in Germany. PATIENTS AND METHODS: This study analyzed data from patients who underwent elective TaTME surgery between 2014 and 2021 in four certified colorectal cancer centers in Germany. Primary endpoints were 3-year local recurrence rate and local recurrence-free survival (LRFS). Secondary outcomes encompassed overall survival (OS), operative time, completeness of local tumor resection, lymph node resection, and postoperative complications. RESULTS: A total of 378 patients were analyzed (mean age 61.6 years; 272 males, 72%). After a median follow-up period of 2.5 years, 326 patients with UICC-stages I-III and tumor operability included in survival analyses. Local recurrence was observed in 8 individuals, leading to a 3-year cumulative local recurrence rate of 2.2% and a 3-year LRFS rate of 88.1%. The 3-year OS rate stood at 88.9%. Within 30 days after surgery, anastomotic leakage occurred in 19 cases (5%), whereas a presacral abscess was present in 12 patients (3.2%). CONCLUSION: TaTME proves effective in addressing the anatomical and technical challenges of low rectal surgery and is associated with pleasing short- and long-term results. However, its safe integration into surgical routine necessitates sufficient knowledge and a previously completed training program.

The impact of plasma-rich platelet injection to perianal sphincters on incontinence and quality of life in patients with rectal cancer after low anterior or intersphincteric resection: a prospective cohort study.

BACKGROUND: Incontinence is not rare after rectal cancer surgery. Platelet-rich plasma may promote tissue repair and generation but has never been tested for the treatment of anal incontinence. This study evaluated the impact of platelet-rich plasma injection on the severity of incontinence and quality of life after low rectal cancer surgery. METHODS: This is a prospective cohort proof of concept study in a colorectal cancer institution. Patients had undergone low anterior or intersphincteric resection for low rectal cancer and had a Wexner score > 4. Ten milliliters of platelet-rich plasma were injected into the internal and external sphincters under endoanal ultrasound (EAUS) guidance. Primary outcome measure was > 2 point improvement in Wexner score (improved group). The patients were assessed with endo-anal ultrasound examination, manometry, the Wexner Questionnaire and SF-36 Health Surveys, and patients were asked whether they used pads and antidiarrheal medications before and 6 months after PRP injection. RESULTS: Of 20 patients included in the study, 14 (70%) were men, and the average age was 56.8 (SD = 9.5) years. No statistically significant difference was found in Wexner scores before and after PRP injection (p = 0.66). Seven (35%) patients experienced a > 2 point improvement in Wexner score. Rectal manometry demonstrated improved squeezing pressure (p = 0.0096). Furthermore, physical functioning scoring (p = 0.023), role limitation (p = 0.016), emotional well-being (p = 0.0057) and social functioning (p = 0.043) domains on the SF-36 questionnaire improved. One (5%) and three (15%) patients stopped using pads and antidiarrheal medications. CONCLUSION: Platelet-rich plasma injection does not restore Wexner scores, but more than one-third of patients may benefit from this application with an improvement of > 2 points in their scores. Platelet-rich plasma injection may improve squeezing pressure and certain life quality measures for incontinent patients after rectal cancer surgery.

Midterm complications after primary obstetrical anal sphincter injury repair in France.

BACKGROUND: Incidence of complications following obstetrical anal sphincter injury (OASI) during vaginal delivery are poorly defined. They are only studied in high level maternities, small cohorts, all stages of perineal tear or in low-income countries. The aim of our study was to describe complications after primary OASI repair following a vaginal delivery in all French maternity wards at short and midterm and to assess factors associated with complication occurrence. METHODS: We conducted a historical cohort study using the French nationwide claim database (PMSI) from January 2013 to December 2021. All women who sustained an OASI repair following a vaginal delivery were included and virtually followed-up for 2 years. Then, we searched for OASIS complications. Finally, we evaluated factors associated with OASIS complication repaired or not and OASIS complication repairs. RESULTS: Among the 61,833 included women, 2015 (2.8%) had an OASI complication and 842 (1.16%) underwent an OASI complication repair. Women were mainly primiparous (71.6%) and 44.3% underwent an instrumental delivery. During a follow-up of 2 years, 0.6% (n = 463), 0.3% (n = 240), 0.2% (n = 176), 0.1% (n = 84), 0.06% (n = 43) and 0.01% (n = 5) of patients underwent second surgery for a perineal repair, a fistula repair, a sphincteroplasty, a perineal infection, a colostomy and a sacral nervous anal stimulation, respectively. Only one case of artificial anal sphincter was noticed. Instrumental deliveries (OR = 1.56 CI95%[1.29;1.9]), private for-profit hospitals (OR = 1.42 [1.11;1.82], reference group "public hospital"), obesity (OR = 1.36 [1;1.84]), stage IV OASIS (OR = 2.98 [2.4;3.72]), perineal wound breakdown (OR = 2.8 [1.4;5.48]), ages between 25 and 29 years old (OR = 1.59 [1.17;2.18], refence group "age between 13 and 24 years old") and 30 and 34 years old (OR = 1.57 [1.14; 2.16], refence group "age between 13 and 24 years old") were factors associated with OASIS complication repairs. CONCLUSIONS: Maternal age, stage IV OASIS, obesity, instrumental deliveries and private for-profit hospitals seemed to predict OASIS complications. Understanding factors associated with OASIS complications could be beneficial for the patient to inform them and to influence the patient's follow-up in order to prevent complications, repairs and maternal distress.

Feasibility and outcomes of robotic sphincter-preserving surgery for rectal cancer after neoadjuvant treatment in patients with preexisting colostomy.

BACKGROUND: Diverting colostomy followed by neoadjuvant treatment is a treatment of choice for obstructive rectal cancer. Such patients may be treated via a robotic approach with several advantages over conventional laparoscopic surgery. Conversely, the existing stoma may interfere with the optimal trocar position and thus affect the quality of robotic surgery. Moreover, the console surgeon does not face the patient, which may endanger the stoma. METHODS: Patients with rectal cancer who underwent sphincter-preserving surgery were retrospectively investigated using a robotic platform after neoadjuvant treatment at our hospital. Based on pretreatment stoma creation, patients were divided into the NS (those without a stoma) and S groups (patients with a stoma). Baseline characteristics, types of neoadjuvant treatment, short-term surgical outcomes, postoperative anorectal manometric data, and survival were compared between the groups. RESULTS: The NS and S groups comprised 65 and 9 patients, respectively. Conversion to laparotomy was required in three patients in the NS group. The S group required a longer console time than the NS group (median: 367 vs. 253 min, respectively, p = 0.038); however, no difference was observed in the total operative time (p = 0.15) and blood loss (p = 0.70). Postoperative complication rates, anorectal function, and oncological outcomes were similar between the groups. CONCLUSIONS: Although console time was longer in patients with a stoma, robotic surgery could be performed safely like in those without a stoma after neoadjuvant treatment.

Anal HPV prevalence in individuals with and without other concomitant sexually transmitted infections.

The association between human papillomavirus (HPV) and other sexually transmitted infections (STIs) in anal lesions still remains unclear. Aim of the study was to evaluate the prevalence of simultaneous infection of HPV and Chlamydia trachomatis, Neisseria gonorrhoeae, Mycoplasma genitalium, and Trichomonas vaginalis in individuals screened for HPV anal infection. A total of 507 anal samples were tested for both anal HPV and STIs: 16% resulted positive for one or more non-HPV STIs. Specifically, C. trachomatis, M. genitalium, and N. gonorrhoeae were detected in 8%, 5%, and 4% of cases, respectively. Two groups were considered, including a positive STI group and a negative STI group. The prevalence of HPV was similar in patients in both groups: high risk (HR)-HPV and low risk (LR)-HPV were 67% and 53% versus 62% (p = 0.361) and 54% (p = 0.864) of patients, respectively. However, HPV 16, 18, 35, 51, 59, and 69 were significantly more frequent in patients tested positive for other STIs versus HPV infection alone (p < 0.05). No significant differences between the two groups were observed in vaccination coverage, 28% versus 32% (p = 0.463), and HIV status, 86% versus 84% (p = 0.658). The study shows that the overall HPV status is not directly correlated to other STIs in the investigated population, except for certain HPV types, including HR-HPV 16, reinforcing the urge for a greater vaccination coverage.

Muscle regeneration therapy using dedifferentiated fat cell (DFAT) for anal sphincter dysfunction.

PURPOSE: We investigated the effects of mouse-derived DFAT on the myogenic differentiation of a mouse-derived myoblast cell line (C2C12) and examined the therapeutic effects of rat-derived DFAT on anal sphincter injury using a rat model. METHODS: C2C12 cells were cultured using DMEM and DFAT-conditioned medium (DFAT-CM), evaluating MyoD and Myogenin gene expression via RT-PCR. DFAT was locally administered to model rats with anorectal sphincter dysfunction 3 days post-CTX injection. Therapeutic effects were assessed through functional assessment, including anal pressure measurement using solid-state manometry pre/post-CTX, and on days 1, 3, 7, 10, 14, 17, and 21 post-DFAT administration. Histological evaluation involved anal canal excision on days 1, 3, 7, 14, and 21 after CTX administration, followed by hematoxylin-eosin staining. RESULTS: C2C12 cells cultured with DFAT-CM exhibited increased MyoD and Myogenin gene expression compared to control. Anal pressure measurements revealed early recovery of resting pressure in the DFAT-treated group. Histologically, DFAT-treated rats demonstrated an increase in mature muscle cells within newly formed muscle fibers on days 14 and 21 after CTX administration, indicating enhanced muscle tissue repair. CONCLUSION: DFAT demonstrated the potential to enhance histological and functional muscle tissue repair. These findings propose DFAT as a novel therapeutic approach for anorectal sphincter dysfunction treatment.

First pediatric pelvic surgery with the Senhance® robotic surgical system: A case series.

The Senhance® robotic system (Senhance [Asensus Surgical Inc., Naderhan, NC, USA]) is a new surgical assistive robot following the da Vinci Surgical System that has been demonstrated to be safe and efficacious. Herein, we report the first case series of pediatric pelvic surgery using Senhance. Two anorectoplasties and one rectal pull-through coloanal anastomosis for rectal stenosis were performed in three children (5-9 months, 7-9 kg) using a 10-mm three-dimensional (3D) 4K camera and 3 and 5 mm forceps operated with Senhance. None of the patients had intraoperative complications or a good postoperative course. Pediatric pelvic surgery with Senhance could be performed precisely and safely with a small body cavity. With its beautiful 3D images, motion of forceps with reduced tremor, and availability of 3-mm forceps, Senhance may be better suited for children compared with other models.

High rates of anal Merkel Cell Polyomavirus and HPV co-infection among people living with HIV.

Knowledge of Human Polyomavirus (HPyV) infection in the anal area and its association with sexually transmitted infections such as Human Papillomavirus (HPV) and Human Immunodeficiency Virus (HIV) remains limited. Therefore, anal specimens from 150 individuals of both sexes were analyzed for screening purposes. HPV DNA was found in 50.7% of cases, with a predominance of high-risk (HR) genotypes. HPyV DNA was found in 39.3% of samples, with Merkel Cell Polyomavirus (MCPyV) being the most common, with a higher viral load than JCPyV and BKPyV. In addition, MCPyV viral load increased in people living with HIV (PLWH) with HPV infection (p < 0.0001).

Quiste Dermoide presacro en un adulto. Reporte de un caso / Presacral dermoid cyst in an adult. Report of a case

Introducción: Durante el desarrollo embriológico, el espacio retrorrectal o presacro está ocupado por células pluripotenciales y, por tanto, puede contener un grupo heterogéneo de tumores. El quiste dermoide es una entidad muy rara dentro de este grupo de tumores. Descripción de caso: femenina de 36 años de edad, con sensación de pesadez en hipogastrio, dolor en sedestación, y cambios en patrón evacuatorio; se realizó palpación abdominal, tacto rectal positivo para masa blanda dolorosa; eco endoanal y resonancia evidenciaron lesión ocupante de espacio presacro. Se realizó exéresis completa vía abdominal, con diagnóstico histopatológico definitivo de quiste dermoide. Discusión: un tumor presacro involucra un reto diagnóstico y terapéutico debido a la gran variedad de diagnósticos diferenciales. En el presente caso se diagnosticó un quiste dermoide, tumor benigno, fuera de su localización habitual. Conclusión: los tumores retrorrectales son lesiones poco habituales, es necesaria la exéresis completa y su posterior estudio histopatológico, para establecer su naturaleza. (AU)

Introduction: During embryological development, the retrorectal or presacral space is occupiedby pluripotent cells and, therefore, may contain a heterogeneous group of tumors. The dermoid cyst is a very rare entity within this group of tumors. Materials and methods: We present a case of a 36-year-old female patient with a sensation of heaviness inthe hypogastrium. Magnetic resonance imaging was performed in which presacral tumor was evident. Results: complete abdominal excision was performed, with a definitive histopathological diagnosis of dermoid cyst. Discussion: a presacral tumor involves a diagnostic and therapeutic challenge due to the great variety of differential diagnoses. The present case was diagnosed with a dermoid cyst, a benign tumor, outside its usual location. Conclusion: Retrorectal tumors are rare tumors, in which complete excision and histopathological report are necessary. (AU)

Effects on anorectal function of endoscopic submucosal dissection for rectal tumors involving the dentate line.

OBJECTIVE: Endoscopic submucosal dissection (ESD) is a specific procedure that uses an electrosurgical knife for en-bloc resectioning large tumors. However, no study has examined the effect of ESD on the defecation function of patients with rectal tumors. We aimed to investigate the potential effects caused by ESD by analyzing changes in the morphology and movement of the anorectum pre- and post-ESD. METHODS: This prospective observational study included 11 patients with anorectal tumors who underwent ESD between April 2020 and February 2022. Pre-ESD assessments included anorectal manometry and defecography. Post-ESD assessments were conducted 2 months later, including anorectal manometry, defecography, and proctoscopy for ulcer and stenosis evaluation. RESULTS: The median patient age was 73 years, including seven males and four females. Eight patients (73%) had a tumor in the lower rectum, and the extent of resection was less than 50% of the rectal lumen. Resection reached the dentate line in six cases (55%). In the patients with post-ESD mucosal defects involving the dentate line, the median of functional anal canal length significantly decreased from (3.4 cm pre-ESD to 2.8 cm post-ESD, p = 0.04). Defecography revealed one case with incomplete evacuation (<50%) and incontinence post-ESD. Interestingly, patients with pre-existing rectoceles noted resolution of lesions post-ESD. None of the patients reported daily constipation or fecal incontinence. CONCLUSIONS: While rectal ESD is unlikely to cause significant real-world defecation difficulties, alterations in rectal and anal canal morphology and function may occur if the dentate line is involved in the resection range.

Blood perfusion assessment by near-infrared fluorescence angiography of epiploic appendages in prevention of anastomotic leakage after laparoscopic intersphincteric resection for ultra-low rectal cancer: a case-matched study.

BACKGROUND: The role of intraoperative near-infrared fluorescence angiography with indocyanine green in reducing anastomotic leakage (AL) has been demonstrated in colorectal surgery, however, its perfusion assessment mode, and efficacy in reducing anastomotic leakage after laparoscopic intersphincteric resection (LsISR) need to be further elucidated. AIM: Aim was to study near-infrared fluorescent angiography to help identify bowel ischemia to reduce AL after LsISR. MATERIAL AND METHODS: A retrospective case-matched study was conducted in one referral center. A total of 556 consecutive patients with ultra-low rectal cancer including 140 patients with fluorescence angiography of epiploic appendages (FAEA)were enrolled. Perfusion assessment by FAEA in the monochrome fluorescence mode. Patients were divided into two groups based on perfusion assessment by FAEA. The primary endpoint was the AL rate within 6 months, and the secondary endpoint was the structural sequelae of anastomotic leakage (SSAL). RESULTS: After matching, the study group (n = 109) and control group (n = 190) were well-balanced. The AL rate in the FAEA group was lower before (3.6% vs. 10.1%, P = 0.026) and after matching (3.7% vs. 10.5%, P = 0.036). Propensity scores matching analysis (OR 0.275, 95% CI 0.035-0.937, P 0.039), inverse probability of treatment weighting (OR 0.814, 95% CI 0.765-0.921, P 0.002), and regression analysis (OR 0.298, 95% CI 0.112-0.790, P = 0.015), showed that FAEA was an independent protector factor for AL. This technique can significantly shorten postoperative hospital stay [9 (6-13) vs. 10 (8-13), P = 0.024] and reduce the risk of SSAL (1.4% vs. 6.0%, P = 0.029). CONCLUSIONS: Perfusion assessment by FAEA can achieve better visualization in LsISR and reduce the incidence of AL, subsequently avoiding SSAL after LsISR.

Study on Intestinal Pressure after Implantation of Biaxial Actuated Artificial Anal Sphincter in Animal.

Fecal incontinence (FI) referred to the inability to control the leakage of solid, liquid, or gaseous feces, the artificial anal sphincter (AAS) was the last resort for patients with FI except enterostomy. In order to the clinical application value of AAS was improved, the detection and analysis of intestinal pressure information was very necessary. Biaxial actuated artificial anal sphincter (BAAS) was a new type of AAS, which not only had a stable, long-term and safe energy supply, but also could provide real-time feedback of intestinal pressure information. In this paper, the BAAS was implanted into piglets for a long-term animal experiment. Piglets' life habits, defecation habits and intestinal pressure were analyzed. The analysis results showed that the BAAS system had good feces control effect, when the actuator of the BAAS system was closed, there was basically no fecal leakage of piglets, and when the actuator of the BAAS system was opened, the piglets could defecate normally. Under the normal condition of the piglets' health state and the BAAS's operating state, the accuracy of the defecation perception reached to 65.79%. This study realized the in-depth study of the mechanism of piglets' defecation, and provided guidance for the development of a new generation of AAS.

The analysis of different types of anorectal abscesses was conducted using the MRI 3D reconstruction technique.

It has not yet been proven whether sepsis affects the tissue around the anal canal. To address this issue, we established three-dimensional models for various types of anorectal abscesses and utilize 3D reconstruction of Magnetic Resonance Imaging scans to assess the extent of muscle damage caused by anorectal abscesses. Patients diagnosed with anorectal abscess, selected from January 2019 to January 2022 underwent pre- and post-operative scanning of pelvic floor and perianal tissues. The aforementioned structures were segmented for the reconstruction of a three-dimensional visual model and measurement of volumes for the abscess as well as the internal and external sphincters and levator ani muscle. The study included a total of 42 patients. Three-dimensional visualization models were created for different types of anorectal abscesses, including perianal, intersphincteric, ischiorectal, and supralevator abscesses. No statistically significant differences were observed in the volume of the internal sphincter, external sphincter, and levator ani muscle between pre- and post-operative patients. The 3D model of anorectal abscess, reconstructed from MRI data, offers a precise and direct visualization of the anatomical structures associated with various types of anorectal abscesses. The infection did not result in any damage to the internal and external anal sphincter and levator ani muscle.