Anorectal Motor Function Research Articles

Toward a core outcome set for faecal incontinence-A systematic review of outcomes reported in the literature.

Faecal incontinence (FI) is a prevalent issue which can have a detrimental impact on the patient's quality of life. Current international guidelines lack strong treatment recommendations due to few studies in the field, in combination with the heterogeneity in outcome reporting. To address this, a core outcome set (COS) is proposed to standardize outcome reporting in FI studies, facilitating meta-analyses and enhancing therapeutic recommendations. Through several steps outlined by COMET 'what' to measure will be determined prior to determining 'how' to measure these outcomes. This systematic review aims to identify 'what' outcomes have been used in FI intervention studies so far in adult patients as a starting phase for the development of a future COS for FI. Medline, Embase and the Cochrane library were searched to identify all outcomes reported in comparative effectiveness trials assessing one or more treatment option in adult patients suffering from FI. The outcomes were categorized according to the Core Outcome Measurement in Effectiveness Trials (COMET) taxonomy to standardize outcome terminology, assess completeness, and inform subsequent steps in COS development. A total of 109 studies were included, which revealed 51 unique outcomes classified into 38 domains within four core areas. On average four outcomes were reported per study (range 1-11). The most commonly reported outcomes were "severity of FI" (83%), "quality of life" (64%), "number of FI episodes" (40%), "anorectal motor function" (39%), and "frequency of bowel movements" (16%). This systematic review offers an overview of outcomes reported in FI studies, highlighting the heterogeneity between studies. This heterogeneity emphasizes the need for standardizing outcome reporting which can be established through the creation of a COS.

Acute lumbosacral nerve stimulation does not affect anorectal motor function in a rodent model.

Sacral nerve stimulation has become a first line treatment for fecal incontinence, however, its effect on the motor function of the anorectum is uncertain. The aim of this study was to apply acute lumbosacral nerve stimulation in an animal model and to determine its effect on the external and internal anal sphincter forces, the rectoanal inhibitory and excitatory reflexes, and the slow wave frequency of the internal anal sphincter. Lumbosacral nerve stimulation was applied to 16 nulliparous female rats. A novel invivo preparation was designed to allow simultaneous monitoring of external and internal anal sphincter forces. The effect of rectal distension on the two anal sphincters was also studied. Lumbosacral nerve stimulation delivered at either S1 or L6 in rodents did not affect sphincter forces, rectoanal reflexes or slow wave frequency of anal canal smooth muscle. The absence of effect on the motor pathways of continence suggests that the mechanism of action is predominantly on sensory feedback mechanisms from the anorectum, thereby increasing cortical awareness of the pelvic floor.

Manometric comparison of anorectal function after posterior vaginal compartment repair with and without mesh.

Background:Although repair augmented with mesh has been proved its priority in anatomical and functional recovery after anterior compartment reconstruction, the data about posterior compartment are scarce. The aim of this study was to compare bowel functional outcome of posterior vaginal compartment repair with and without mesh in patients with pelvic organ prolapse (POP).Methods:This was a prospective, double-blind, clinical pilot study of 22 postmenopausal women with symptomatic POP (overall POP-quantification [POP-Q] Stage III-IV) who underwent total pelvic floor reconstruction. Patients were grouped according to the use of mesh for posterior vaginal compartment repair: A mesh group and a nonmesh group. POP-Q stage, the pelvic floor impact questionnaire short form-7 (PFIQ-7) and anorectal manometry were evaluated before and 3 months after surgery. Anatomical success was defined as POP-Q Stage II or less. A t-test was used to compare preoperative with postoperative data in the two groups.Results:Totally, 17 (71%) were available for the follow-up. POP-Q measurements improved significantly compared to baseline (P < 0.05) in both groups. No recurrence was observed. Subjects in both groups reported improvement in pelvic floor symptoms, and there was no significant difference in the PFIQ-7 score between groups at follow-up (P > 0.05). Compared with baseline, the nonmesh group exhibited a statistically significant decrease in anal residual pressure, a significant increase in the anorectal pressure difference during bowel movement, and a reduced rate of dyssynergia defecation pattern (P < 0.05).Conclusions:Provided there is sufficient support for the anterior wall and apex of vagina with mesh, posterior compartment repair without mesh may be as effective as repair with mesh for anatomical recovery while providing better anorectal motor function.

Rectosigmoid Ectasia Associated with Anorectal Anomaly Repair: Experience with Sigmoid Anterior Resection and Endorectal Pull-Through

Surgical treatment of anorectal anomalies may be followed by severe constipation with or without overflow incontinence secondary to dilation and ectasia of the rectosigmoid. The aim of this study is to evaluate the efficacy of anterior resection and endorectal pull-through for the treatment of rectosigmoid ectasia secondary to posterior sagittal anorectoplasty (PSARP). Seven patients with a history of PSARP presented with serious rectosigmoid ectasia and overflow incontinence of fecal impaction. Four were boys and 3 were girls aged from 16 months to 15 years. Preoperative diagnosis was based on physical examination, barium enema, MRI and rectal biopsy. Surgical treatment of the post-PSARP rectal ectasia was made by anterior resection of the ectatic segment of the sigmoid combined with pull-through of normal colon into the mucosectomized ectatic rectum. During a four-to ten-year follow-up period all of our patients had normal bowel movements. Postoperative barium enema radiography demonstrated a normal rectal caliber and manometry revealed normal anorectal motor function. The good postoperative results draw attention to the following. a) The aim of the surgical treatment of megarectum is to establish a neorectum with normal bowel. b) Resection of megasigmoid and pull-through of bowel with normal caliber into the mucosectomized ectatic rectum is an effective procedure in patients with post-PSARP rectosigmoid ectasia. c) The neorectum attains its reservoir function through a gradual process after resection and endorectal pull-through.

Characterization of anorectal pressure and the anorectal inhibitory reflex in healthy preterm and term infants

Objectives: To evaluate anorectal motor function in healthy premature and term infants with the use of micromanometric techniques. Study design: Anorectal manometry was performed in 22 healthy neonates (9 female) with a mean postmenstrual age of 32 weeks (range, 30 to 38 weeks) with a micromanometric anorectal assembly (od 2.0 mm). The assembly incorporated a 2-cm-long sleeve sensor for measurement of resting anal sphincter pressures and relaxation, and 4 sideholes recorded anal and rectal pressures. Rectal distension was performed with a latex balloon or direct air insufflation to elicit the anorectal inhibitory reflex (AR). Results: The mean anal sphincter pressure, rectal pressure, and rhythmic wave frequency were 40 mm Hg (range, 7 to 65 mm Hg), 11 mm Hg (range, 1 to 27 mm Hg), and 10/min (range, 8 to 14/min), respectively. A normal AR could be elicited in 21 of the 22 infants studied. Conclusion: An anorectal micromanometric sleeve catheter is suitable for use in evaluating anorectal pressures in preterm and term neonates. Insufflation of air without the use of a balloon to elicit the AR is reliable and suitable for use in infants <34 weeks. Premature infants older than 30 weeks’ postmenstrual age have normal anorectal pressures and a normal AR. (J Pediatr 2001;139:233-7)

Resolution of anorectal incontinence in herpes proctitis confirmed by anorectal manometry

Herpes simplex virus has been known to affect anorectal motor function when the vaginal and anorectal area are infected by this virus.1-3 We describe the resolution of sacral nerve dysfunction manifested primarily by fecal incontinence in a patient with anogenital herpes infection, as documented by serial anorectal manometry recordings.

A retrospective study of the effects of pelvic irradiation for gynecological cancer on anorectal function

Purpose: To evaluate the prevalence of anorectal dysfunction following therapeutic pelvic irradiation. Methods and Materials: Anorectal function was evaluated in 15 randomly selected patients (aged 47–84 years) who had received pelvic irradiation for treatment of carcinoma of the uterine body and cervix 5 and 10 years earlier. The following parameters were assessed in each patient: (a) anorectal symptoms (questionnaire), (b) anorectal pressures at rest and in response to rectal distension, voluntary squeeze, and increases in intraabdominal pressure (multiport anorectal manometry with concurrent electromyography of the anal sphincters), (c) rectal sensation (rectal balloon distension) and, (d) anal sphincteric morphology (ultrasound). Results were compared with those obtained in nine female control subjects. Results: Ten of the 15 patients had urgency of defecation and 4 also fecal incontinence. Basal anorectal pressure measured just proximal to the anal canal ( p = 0.05) and anorectal pressures generated in response to voluntary squeeze measured at the anal canal were less ( p < 0.01) in the patients. The fall in anal pressures in response to rectal distension was greater in the patients ( p < 0.05) and the desire to defecate occurred at lower rectal volumes ( p < 0.05). The slope of the pressure/volume relationship in response to rectal distension was greater ( p < 0.05) in the patients, suggestive of a reduction in rectal compliance. In 14 of the 15 patients at least one parameter of anorectal motor function was outside the control range. There was no difference in the thickness of the anal sphincters between the two groups. Conclusion: Abnormal anorectal function occurs frequently following pelvic irradiation for gynecological malignant diseases and is characterized by multiple dysfunctions including weakness of the external anal sphincter, stiffness of the rectal wall, and a consequent increase in rectal sensitivity.

Viscerocutaneous nociception and anorectal motor function: A prospective study in asymptomatic, healthy volunteers

Viscerocutaneous nociception and anorectal motor function: A prospective study in asymptomatic, healthy volunteers

Combined sensory and motor deficit in primary neuropathic faecal incontinence.

Eleven patients with idiopathic faecal incontinence (IFI) and nine normal controls were studied with techniques of mucosal electrosensitivity and rectal distention for the quantitative assessment of anal and rectal sensation and with manometric and electromyographic tests for the assessment of anorectal motor function. The tests of motor function showed pelvic floor motor neuropathy in the patients with IFI, compared with controls, anal canal resting and voluntary contraction pressures were significantly (p less than 0.05, p less than 0.002) lower, pudendal nerve terminal motor latency and external anal sphincter fibre density were significantly (p less than 0.05, p less than 0.05) raised. The results of mucosal electrosensitivity (MES) disclosed a sensory deficit in the anal canal in patients with IFI, compared with controls, MES threshold was significantly (p less than 0.002) higher. Sensory thresholds to rectal distension were similar in the two groups. This study shows that sensory deficit of the anal canal occurs in combination with the motor neuropathy of the anal canal musculature in primary neuropathic faecal incontinence.