Anorectal manometry in children with defecation disorders BSPGHAN Motility Working Group consensus statement

Testing in functional constipation-What's new and what works

BACKGROUND

Constipation is among the most common symptoms prompting a consultation with a paediatric gastroenterologist. While most patients will respond to lifestyle and dietary changes and conventional therapy, some may require diagnostic studies.

AIM

To review the diagnostics studies used to evaluate children with functional constipation.

MATERIALS AND METHODS

There is no evidence to support the routine use of abdominal X-rays in the evaluation of paediatric constipation. Colon transit by radiopaque markers (ROM) should be indicated when medical history does not match clinical findings, to guide colon manometry (CM) performance and to discriminate between faecal incontinence from functional constipation and non-retentive faecal incontinence. Colon scintigraphy may be useful as an alternative to ROM. Lumbar spine MRI may be indicated to evaluate for spinal abnormalities. The role of defecography has not been properly evaluated in children. Anorectal manometry in children is indicated primarily to evaluate anal resting pressure, presence and quality of the recto-anal inhibitory reflex and simulated defecation manoeuvres. The CM is indicated to guide surgical interventions after failing medical therapy.

CONCLUSIONS

The goal of these studies is to identify treatable causes of constipation. Most of these studies are designed to evaluate anatomy, transit and/or colon/rectum motility function and are primarily indicated in those who fail to respond to conventional therapy.

Review article: Functional constipation: Pathophysiology, evaluation and management

BACKGROUND

Functional constipation (FC), a disorder of the gut-brain interaction of multifactorial pathophysiology that is prevalent in paediatrics. It is associated with bothersome symptoms, increased healthcare costs, disgruntled caregivers and impaired health-related quality of life. Paediatric FC is a clinical diagnosis based on the Rome IV criteria and is characterised by decreased bowel movement frequency and/or hard, painful stools and can be complicated by retentive faecal incontinence. Stressful life events, difficult temperaments and emotional and behavioural challenges have been implicated in increasing risk of developing paediatric FC.

AIMS

To provide current concepts in pathophysiology, evaluation and management of paediatric FC.

METHODS

We reviewed pertinent literature after a comprehensive search utilising PubMed with keywords FC, chronic childhood constipation and paediatric FC.

RESULTS

In the last decade, advances in our understanding of paediatric FC have changed the landscape of diagnosing and treating this disorder. Although polyethylene glycol is the first-line treatment for maintenance of FC, the armamentarium of therapeutics has expanded including the first Food and Drug Administration- agent, linaclotide, for children 6-17 years of age in conjunction with more emphasis on behavioural and physical therapy interventions.

CONCLUSIONS

Treatment approach to paediatric FC should be individualised and integrated focusing on parental education, lifestyle and behavioural modifications, and pharmacological therapy to maximise therapeutic success. This review highlights advances in pathophysiology, diagnosis and treatment of FC in children.

Diagnostic and therapeutic approach to children with chronic refractory constipation: Consensus report by the SIGENP motility working group

Constipation is a common problem in children, accounting for about 3% of all primary care visits and up to 25% of referrals to paediatric gastroenterologists. Although polyethylene glycol often proves effective, most children require prolonged treatment and about 50% of them have at least one relapse within the first 5 years after initial recovery. When conventional treatment fails, children are considered to have refractory constipation. Children with refractory constipation deserve specialist management and guidance. Over the last decades, there has been a remarkable increase in our knowledge of normal and abnormal colonic and anorectal motility in children, and a number of different techniques to measure transit and motility have been developed. The present review analyses the possible diagnostic investigations for children with refractory constipation, focusing on their actual indications and their utility in clinical practice. Moreover, we have also analytically reviewed medical and surgical therapeutic options, which should be considered in selected patients in order to achieve the best clinical outcome.

High-Resolution Anorectal Manometry as a Screening Tool for Hirschsprung's Disease: A Comprehensive Retrospective Analysis

Hirschsprung's disease (HD) is characterized by a congenital absence of enteric ganglion cells in the intestine, posing challenges in diagnosis, particularly in pediatric patients. The gold standard, rectal suction biopsy (RSB), carries risks, prompting an exploration of non-invasive alternatives such as high-resolution anorectal manometry (HR-ARM) for HD screening. We conducted a retrospective analysis of 136 patients suspected of HD between 2018 and 2022, which were stratified into three age groups: ≤12 months, ≤24 months, and >24 months. Criteria for suspicion included delayed meconium passage, unresponsive chronic constipation, and abnormal prior test results. HR-ARM, supplemented by additional tests, confirmed 16 HD cases. HR-ARM exhibited 93.75% sensitivity, 89.47% specificity, 99.03% negative predictive value (NPV), and 55.56% positive predictive value (PPV). Notably, HR-ARM consistently performed well in patients ≤ 2 years old but demonstrated reduced efficacy in older children, which was likely due to complications from chronic constipation. This study underscores HR-ARM's promise as a non-invasive HD screening tool, especially in younger patients. However, its limitations in older children warrant consideration. Establishing standardized protocols, particularly for assessing the recto-anal inhibitory reflex, is crucial. Further research is imperative to optimize HR-ARM's diagnostic role across varied age groups in HD assessment.

High-resolution anorectal manometry in children

Anorectal manometry is one of the motility tests in children performed by pediatric gastroenterologist. It evaluates the motility function of anorectal tract. It is helpful for diagnosing children with constipation, rectal hypersensitivity, fecal incontinence, Hirschsprung disease, anal achalasia, and anorectal malformations. The most common indication to perform anorectal manometry is to diagnose Hirschsprung disease. It is a safe procedure. This paper discusses recent advances and reviews on anorectal motility disorders in children.

State of the Art Bowel Management for Pediatric Colorectal Problems: Functional Constipation

BACKGROUND

Functional constipation (FC) affects up to 32% of the pediatric population, and some of these patients are referred to pediatric surgery units to manage their constipation and/or fecal incontinence. The aim of the current paper is to report the recent updates on the evaluation and management of children with FC as a part of a manuscript series on bowel management in patients with anorectal malformations, Hirschsprung disease, spinal anomalies, and FC.

METHODS

A literature search was performed using Medline/PubMed, Google Scholar, Cochrane, and EMBASE databases and focusing on the manuscripts published within the last 5-10 years.

RESULTS

The first step of management of children with FC is to exclude Hirschsprung disease with a contrast study, examination under anesthesia, anorectal manometry (AMAN). If AMAN shows absent rectoanal inhibitory reflex, a rectal biopsy is performed. Internal sphincter achalasia or high resting pressures indicate botulinum toxin injection. Medical management options include laxatives, rectal enemas, transanal irrigations, and antegrade flushes. Those who fail conservative treatment require further assessment of colonic motility and can be candidates for colonic resection. The type of resection (subtotal colonic resection vs. Deloyer's procedure) can be guided with a balloon expulsion test.

CONCLUSION

Most of the patients with FC referred for surgical evaluation can be managed conservatively. Further studies are required to determine an optimal strategy of surgical resection in children unresponsive to medical treatment.

Post-Operative Anorectal Manometry in Children following Anorectal Malformation Repair: A Systematic Review

Despite surgical correction, children with anorectal malformations may experience long-term bowel dysfunction, including fecal incontinence and/or disorders of evacuation. Anorectal manometry is the most widely used test of anorectal function. Although considerable attention has been devoted to its application in the anorectal malformation cohort, there have been few attempts to consolidate the findings obtained. This systematic review aimed to (1) synthesize and evaluate the existing data regarding anorectal manometry results in children following anorectal malformation repair, and (2) evaluate the manometry protocols utilized, including equipment, assessment approach, and interpretation. We reviewed four databases (Embase, MEDLINE, the Cochrane Library, and PubMed) for relevant articles published between 1 January 1985 and 10 March 2022. Studies reporting post-operative anorectal manometry in children (<18 years) following anorectal malformation repair were evaluated for eligibility. Sixty-three studies were eligible for inclusion. Of the combined total cohort of 2155 patients, anorectal manometry results were reported for 1755 children following repair of anorectal malformations. Reduced resting pressure was consistently identified in children with anorectal malformations, particularly in those with more complex malformation types and/or fecal incontinence. Significant variability was identified in relation to manometry equipment, protocols, and interpretation. Few studies provided adequate cohort medical characteristics to facilitate interpretation of anorectal manometry findings within the context of the broader continence mechanism. This review highlights a widespread lack of standardization in the anorectal manometry procedure used to assess anorectal function in children following anorectal malformation repair. Consequently, interpretation and comparison of findings, both within and between institutions, is exceedingly challenging, if not impossible. Standardized manometry protocols, accompanied by a consistent approach to analysis, including definitions of normality and abnormality, are essential to enhance the comparability and clinical relevance of results.

Do we need an extra dimension? A pilot study on the use of three-dimensional anorectal manometry in children with functional constipation

BACKGROUND

Recently, a new high-definition (or three-dimensional "3D") high-resolution anorectal manometry (3D-ARM) catheter has been introduced. This catheter allows for a more detailed visualization of the anal canal. However, its clinical utility and tolerability in children with constipation are unknown. Our primary objective was to evaluate the agreement between findings from solid-state high-resolution anorectal manometry (HR-ARM) and 3D-ARM. Secondary objectives were to investigate if 3D-ARM has additional value over HR-ARM and to evaluate patient and provider experience.

METHODS

Prospective pilot study including children (8-18 years of age) with functional constipation scheduled for anorectal manometry. Children underwent HR-ARM and 3D-ARM consecutively. We compared manometry results of both procedures and collected data on patient and provider experience via self-developed questionnaires.

KEY RESULTS

Data of ten patients were analyzed (60% female, median age 14.9 years). In the majority of patients, ARMs were performed awake (n = 8, 80%). In two patients, the recto-anal inhibitory reflex (RAIR) was visualized during HR-ARM but not during 3D-ARM. Anal canal resting pressures were significantly higher during 3D-ARM compared to HR-ARM (median 77 mmHg [IQR 59-94] vs. 69 mmHg [IQR 51-91], respectively, p = 0.037). No significant anatomical or muscular abnormalities were visualized during the 3D-ARM. The majority of children identified the 3D-ARM as the more unpleasant (5/7 [71%]) and more painful procedure (6/7 [86%]) and therefore preferred the HR-ARM (4/7 [57%]).

CONCLUSIONS & INFERENCES

In our patient sample, 3D-ARM was associated with more discomfort without providing more useful information and even resulted in an inconsistent visualization of the RAIR.

Alterations in the Rectal Sensitivity of Children With Chronic Constipation Evaluated by High-Resolution Anorectal Manometry

Introduction

Constipation is one of the most frequent chronic disorders in children and is almost always of functional etiology. Manometric alterations in anorectal sensitivity in children with chronic constipation are described in the literature; nevertheless, the impact of the duration of constipation on the parameters of anorectal manometry sensitivity is unknown.

Objective

To compare the parameters of sensitivity of high-resolution anorectal manometry (first sensation, threshold volume for urgency, and maximal tolerability) in children with chronic constipation, related to the time of evolution from the beginning of the symptoms.

Methods

This was a retrospective observational analytic study. The data of 39 children with functional constipation who were subjected to high-resolution anorectal manometry were included to evaluate constipation. The patients were divided into three groups according to the duration of constipation: <1 year; from 1 to 2 years; and >2 years. The parameters of sensitivity of the anorectal manometry were compared between the three groups and correlation tests were performed with the duration in months from the beginning of the symptoms of constipation.

Results

There was no difference between the sensitivity parameters of high-resolution anorectal manometry of the three groups; no correlation of these parameters with the time of evolution of the symptoms was found.

Conclusions

Alterations in the anorectal distensibility could develop early in the course of the disease, even from the first year of the beginning of the symptoms.

Post-operative anorectal manometry in children with Hirschsprung disease: A systematic review

BACKGROUND

Hirschsprung disease is commonly encountered by pediatric surgeons. Despite advances in the surgical management, these children may experience symptoms of bowel dysfunction throughout adulthood. Anorectal manometry may be used to assess post-operative anorectal structure and function. This review aimed to consolidate and evaluate the literature pertaining to post-operative findings of anorectal manometry in children with Hirschsprung disease.

PURPOSE

(1) Synthesize the available data regarding anorectal motility patterns in children following repair of Hirschsprung disease. (2) Evaluate the reported anorectal manometry protocols.

DATA SOURCES

We performed a systematic review of four databases: Embase, MEDLINE, the Cochrane Library, and PubMed.

STUDY SELECTION

This systematic review was performed in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). Studies reporting results of post-operative anorectal manometry in children with Hirschsprung disease were evaluated for inclusion.

RESULTS

Twenty-three studies satisfied inclusion criteria, with a combined cohort of 939 patients. Post-operative anorectal manometry results were reported for 682 children. The majority of included studies were assessed as "poor quality." Disparate manometry protocols, heterogeneous cohorts, and lack of standardized outcome assessments introduced a risk of outcome reporting bias, limited the comparability of results, and impeded clinical translation of findings.

CONCLUSIONS

This systematic review demonstrated the lack of high-quality evidence underlying the current understanding of post-operative anorectal motility in children with HD. There was little consistency in reported manometry outcomes between studies. In future work, emphasis must be placed on the application of standardized manometry protocols, cohort reporting, and patient outcome assessments.

THE FATIGUE RATE INDEX IS HIGHER IN CHILDREN WITH FUNCTIONAL CONSTIPATION AND RETENTIVE FECAL INCONTINENCE

BACKGROUND

The Fatigue Rate Index (FRI) is a parameter in anorectal manometry (ARM) to assess sustained voluntary contraction, considering the squeeze pressure and fatigability of the external anal sphincter. It is used in adults to detect fecal incontinence even in patients who present normal squeeze pressures. The FRI in adult patients with functional constipation is similar to controls.

OBJECTIVE

The aim of this study was to evaluate the feasibility and values of FRI in children in relation to the values previously established in adults and comparing children with functional constipation and retentive fecal incontinence to children without retentive fecal incontinence.

METHODS

This retrospective study evaluated 105 ARM performed from Jan 2014 to Apr 2015. 42 patients were selected (were able to perform a voluntary contraction and had no co-morbidities other than functional constipation). 14 (33.3%) of those collaborated in sustaining contraction for 40 seconds (s), allowing the evaluation of the FRI. Patients with retentive fecal incontinence secondary to functional constipation (n=7, aged 6 to 13 years, six boys) were our interest group. Patients with functional constipation without fecal incontinence (n=7, aged 6 to 13 years, four boys) were considered a reference group. The ARM were performed with a radial eight-channel perfusion catheter (DynamedTM, São Paulo, Brazil) and the FRI was calculated (Proctomaster 6.4) in the first 20 s and overall 40 s of sustained voluntary contraction.

RESULTS

14 of the selected 42 collaborated in sustaining contraction for 40 s, allowing the evaluation of the FRI. In the first 20 s of contraction, the fecal incontinence group showed a significantly higher mean FRI (2.48±1.39 min) compared to the reference group (1.13±0.72 min, P=0.042), which was not observed in the 40 s interval due to less uniform contraction. The anal resting pressure was higher in the fecal incontinence group (76.83 mmHg) than in the reference group (54.13 mmHg), but the statistical study did not reach significance (P=0.051).

CONCLUSION

The FRI is feasible in children. The mean FRI obtained in this study is lower than the reported in constipated adults. The mean FRI among children with functional constipation and retentive fecal incontinence is higher than among constipated children without retentive fecal incontinence.

Systematic review and meta-analysis of anal motor and rectal sensory dysfunction in male and female patients undergoing anorectal manometry for symptoms of faecal incontinence

AIM

Manometry is the best established technique to assess anorectal function in faecal incontinence. By systematic review, pooled prevalences of anal hypotonia/hypocontractility and rectal hypersensitivity/hyposensitivity in male and female patients were determined in controlled studies using anorectal manometry.

METHODS

Searches of MEDLINE and Embase were completed. Screening, data extraction and bias assessment were performed by two reviewers. Meta-analysis was performed based on a random effects model with heterogeneity evaluated by I² .

RESULTS

Of 2116 identified records, only 13 studies (2981 faecal incontinence patients; 1028 controls) met the inclusion criteria. Anal tone was evaluated in 10 studies and contractility in 11; rectal sensitivity in five. Only three studies had low risk of bias. Pooled prevalence of anal hypotonia was 44% (95% CI 32-56, I² = 96.35%) in women and 27% (95% CI 14-40, I² = 94.12%) in men. The pooled prevalence of anal hypocontractility was 69% (95% CI 57-81; I² = 98.17%) in women and 36% (95% CI 18-53; I² = 96.77%) in men. Pooled prevalence of rectal hypersensitivity was 10% (95% CI 4-15; I² = 80.09%) in women and 4% (95% CI 1-7; I² = 51.25%) in men, whereas hyposensitivity had a pooled prevalence of 7% (95% CI 5-9; I² = 0.00%) in women compared to 19% (95% CI 15-23; I² = 0.00%) in men.

CONCLUSIONS

The number of appropriately controlled studies of anorectal manometry is small with fewer still at low risk of bias. Results were subject to gender differences, wide confidence intervals and high heterogeneity indicating the need for international collective effort to harmonize practice and reporting to improve certainty of diagnosis.

Anorectal Manometry in Children: The Update on the Indications and the Protocol of the Procedure

Anorectal disorders are common in children. They are related to structural and/or functional abnormalities of the anorectum or pelvic floor with a variety of symptoms. Therefore, diagnostic tests to evaluate anorectal function can help to better understand the underlying pathophysiology and aetiology as well as facilitate patient management. During the past decades, substantial efforts have been made to improve anorectal function testing; however, more advanced investigations might lead to difficulties in interpretation. Additionally, a great diversity of equipment and protocols are used among centres, which may lead to heterogeneous interpretation of results. More studies to standardize methods of testing and validate reference values are strongly recommended in children. This review updates on the current indications and the protocol of anorectal manometry.

A Critical Analysis of Rectal Biopsy to Exclude Hirschsprung's Disease

INTRODUCTION

 Most Hirschsprung's disease (HD) are diagnosed in young children with increased risk ("red flag"). Older children (>6 months) require open rectal biopsy (ORB) with its own impact on risk and resources. We investigated if "red flag", age, and sex used in combination could exclude HD.

MATERIALS AND METHODS

 "Red flags" are risk factors associated with HD, including neonatal bowel obstruction, genetic association, failure of passage of meconium in <48 hours, infantile constipation, distension with vomiting, or family history. All rectal biopsies (2015-2018) were reviewed for indications, methods, and histopathological findings. Logistic regression analysis was adopted to assess predictive value of "red flag," age, and sex (p < 0.05* was significant).

RESULTS

 A total of 187 children underwent 84 suction rectal biopsies and 113 ORBs (n = 197 in total). Final histopathological diagnoses were non-HD (n = 154) and HD (n = 43). Total 78% of rectal biopsies were non-HD, of which 63% by ORB. Non-HD was associated with absence of "red flag" (49 vs. 16%*), increased age at biopsy (22 months vs. 28 days*), >6 months old (62 vs. 30%*), and female gender (54 vs. 16%*), compared with HD. In the absence of "red flag," 7/82 (9%) had HD (negative predictive value = 91%). Logistic regression analysis found absent "red flag" predicted non-HD biopsy with odds ratio 4.77 (1.38, 16.47), corrected for age and sex.

CONCLUSION

 Negative rectal biopsy rate for HD is very high. The majority required ORB. Although "red flag" and gender, but not age, have strong predictive values, it is inadequate for excluding HD. This study supports the need for alternative strategies in excluding HD.

High-Resolution Anorectal Manometry-A Prospective Cohort Study in Healthy Infants

OBJECTIVES

Functional gastrointestinal disorders (FGD) are common during early childhood. In severe defecation disorders, anorectal manometry (AM) is done to exclude aganglionosis. High-resolution anorectal manometry (HRAM) can probably improve diagnostics but normative data in infants are scarce. This study aims to provide HRAM data in healthy infants overall and in subgroups of infants with FGD, defined as functional constipation (FC), infant colic (IC), and infant dyschezia (ID) (ROME 3 criteria).

METHODS

This prospective observational cohort study enrolled healthy term infants, having HRAM at 2 and 6 months, using a water-perfused pediatric anorectal silicone catheter. Data were provided for presence of anorectal waves and recto anal inhibitory reflex (RAIR), volume needed to elicit RAIR and anal resting pressure (ARP). Questionnaires at 2 and 6 months identified subjects with FC, IC, and ID.

RESULTS

A total of 187 HRAM investigations were done in 107 infants, without any complications. Normal RAIR was found in all, at least on one occasion. Mean ARP increased between 2- and 6-month investigations in infants without FGD. No other differences in HRAM data could be seen between infants with or without an FGD. At 2 months FC, IC, and ID were seen (2%, 4%, and 17%), whereas at 6 months only FC and ID were seen (7% and 1%).

CONCLUSION

We can provide data on HRAM in infants at 2 and 6 months of age. When performing repeated HRAM in healthy infants, RAIR was found in all subjects. HRAM is safe, easy tolerable, and can be recommended in infants with or without FGD.

Anorectal Manometry on Children: A Moroccan Series and Literature Review

Introduction and objectives: Anorectal manometry is a test that evaluates the function of the rectum,but also the anus. It is useful for the diagnosis of several conditions like fecal incontinence and constipation.In children these tests are being increasingly used for all ages.The aim of this study was to determine the benefit of anorectal manometry in children and to report our experience. Material and Methods:Over a period of four years, 273children that underwent anorectal manometry were included in the study,their data and tests results were analyzed. Results:Out of 273 patients included,68,5% were boys and 31,5% were girls.The mean age was 9 years.154patients(51,6%) had Fecal incontinence(Group1),75children(27,5%) had chronic constipation(Group2),and both of them(Group3) were reported in 37children(13,6%).An awake manometry was  performed in 248children(91%) however this test under sedation allowed us the exclusion of Hirschsprung’s disease in 21children(84%).In group1, 25%patients had bad anal contraction.In groupe3, 21,6%children had bad anal contraction.The statistical analysis showed a significant difference in age(p=0.022) and resting pressure(p=0.050) between the three groups.Children with fecal incontinence had a higher rate of dyssynergy,80.2% and 83.8% in groups 1 and 3 respectively compared to 60.4% in patients with chronic constipation(p=0,852) Conclusion:The gold standard for the exploration of children’s terminal constipation and encopresis is the anorectal manometry.It is an important tool to establish diagnosis.In our study, this test allow the exclusion of Hirschsprung’s disease in infants with constipation,  in other hand we found a higher rate of dyssynergy in children with fecal incontinence(80%) which had allow us to propose a biofeedback therapy.