Anorectal malformations

Magnetic Compression Anastomosis for Anorectal Malformations: Feasibility and Efficacy in Swine Model and Clinical Observation

BACKGROUND

Patients with anorectal malformations (ARM) commonly experience post-operative bowel dysfunctions due to inherent neuromuscular dysplasia and surgical damage to extraluminal structures. Magnetic compression anastomosis (MCA) minimizes injury to the perirectal neurovascular bundle and sphincter muscles via an endoluminal approach. We evaluated the preclinical feasibility and healing efficacy of a novel MCA device in a swine model of ARM and applied the device to an ARM patient.

METHODS

Two prototype MCA devices (8 mm and 10 mm diameter) were tested at piglets'abdominal wall tissue to evaluate suitable magnetic force to cause local ischemia and necrosis. Eight piglets underwent ARM modeling and were divided into MCA or hand-sewn (HS) anastomosis groups (n = 4 per group). After two weeks of monitoring, the piglets were sacrificed. Radiography assessed the MCA progression, and anastomosis integrity was evaluated through histology. The device was later modified and applied to an infant with intermediate ARM.

RESULTS

The 10 mm MCA devices successfully aligned at the piglets'abdominal wall tissue, while the 8 mm MCA device failed. The 10 mm MCA devices were selected for rectoanal anastomosis in model and showed an average anal recanalization time of 8 days, with smooth anastomosis sites and no foreign body response. Minimal inflammation was seen in the MCA group compared to HS group. The modified MCA device was applied to the ARM patient, with successful anastomosis by postoperative day 8.

CONCLUSION

MCA is a safe and effective method for anastomosis in ARM, providing a foundation for further clinical applications.

LEVEL OF EVIDENCE

III.

Outcomes of Management of Anterior Anus in Girls in Glasgow, UK

BACKGROUND

Anterior anus is considered part of the spectrum of anorectal malformations in girls and has been associated with childhood constipation. However, limited literature exists on outcomes and associated malformations.

METHODS

All girls <6 months referred to our centre with suspected anterior anus between January 2015 and December 2022 were identified. Data collected included patient demographics, presence of anomalies, operative management, laxative use and continence. Results are described using descriptive statistics and percentages.

RESULTS

147 girls were referred with suspected anterior anus of which 95 were confirmed to have an anterior anus. Median age of first assessment was 3 (0-13) months. Median follow up was 24 (1-94) months. 21 (22.1 %) had clinical concern of partial absence of normal circumferential anal corrugation. 10 (10.5%) girls underwent examination under anaesthesia; 4 patients underwent anoplasty with covering colostomy. Laxatives were prescribed in 31 (32.6%) girls. Of the 53 patients followed up to age 4 years and older, 51 (96.2%) achieved continence. On renal ultrasonography significant hydroureteronephrosis was detected in one patient. No significant spinal anomalies were detected on imaging. Two patients had ventricular-septal defects were identified. All significant anomalies were in patients with an ectopic anus/ perineal fistula.

CONCLUSION

This represents the largest reported series of girls with anterior anus. The incidence of identified associated malformations was low. Furthermore, laxative use and continence outcomes are similar to the general infant/childhood population. Screening and routine follow-up should be reserved for individual cases where there is clinical concern.

Anorectal malformations

Anorectal malformations (ARM) are rare congenital anomalies with an overall prevalence of 3.32 per 10,000 pregnancies. ARM describe a spectrum of anomalies of the anus and rectum ranging from a minimally displaced anal canal to a complete fusion of the anorectum, vagina and urethra with hypoplastic sphincter and pelvic floor muscle. Aberrant septation of the hindgut with anomalous cloacal membrane during weeks 6 to 9 of gestation form the developmental basis for a spectrum of anomalies defined as ARM. Although underlying specific syndromes and occasional familiar occurrence suggest genetic aetiology, most ARM are non-syndromic and their causal genetic mechanisms and non-genetic insults remain unclear. ARM is a clinical diagnosis, generally made early after birth via careful inspection of the perineum. Prenatal detection remains rare, and modern technical developments have added little to prenatal diagnostics. ARM is corrected surgically. Since its introduction in 1982, posterior sagittal anorectoplasty is the most common surgery for ARM reconstruction. Subsequent surgical adaptations focus on minimizing iatrogenic operative injury by limiting surgical invasiveness. They include laparoscopic procedures and shortening of incisions with confined dissection in open surgery. Although outcomes in patients with ARM have evolved throughout the past decades, there is urgent need for further improvements both in functional outcomes and quality of life. The importance of psychosocial experiences of affected patients is increasingly recognized. Continued research is necessary to improve prenatal detection, to elucidate genetic and epigenetic alterations and to refine optimal surgical procedures.

One stage anterior sagittal sphincter saving anorectoplasty (ASSSARP) for the repair or rectovestibular fistula: mid and long-term outcome in two tertiary centers

PURPOSE

This is a retrospective study of one-stage anterior sagittal sphincter saving anorectoplasty (ASSSARP) for repairing rectovestibular fistula (RVF) including operative details and postoperative complications, functional and cosmetic outcome.

PATIENTS AND METHODS

Records of 41 cases of RVF, managed between April 2010 and September 2019 by one-stage ASSSARP, were reviewed. Preoperative preparation, both early and late postoperative care & complications, hospital stay, and functional & cosmetic outcomes were reported.

RESULTS

The mean age was 6.6 months. Vaginal tear occurred in 5/41 cases, and distal rectal tears in 4/41 cases. Thirteen patients suffered mild superficial wound inflammation; while Skin dehiscence; occurred in five patients. No colostomy or redo was needed. The mean hospital stay was 6.1 days. Mean follow-up was 43.13 months; (Range; 24-100 months). Subclinical anal stricture was detected in six patients. Constipation occurred in 14 cases. Soiling grade I occurred in five patients. Thirty-two patients reached past the age of three years; two of whom showed cough/diarrhea incontinence.

CONCLUSION

One-stage ASSSARP is safe and gives functional and cosmetic results comparable to other techniques. It provides better access during RVF repair. The avoidance of muscle incision protects against muscle breakdown, if infection sets in, and thus against incontinence. It avoids the morbidity, cost and psychological burden of performing a three-stage repair.

Anorectal malformations (ARM) and VACTERL association and severity of congenital heart diseases (CHD): Experience of 396 consecutive patients in a tertiary center

OBJECTIVE

Congenital heart diseases (CHD) are the most frequently associated anomalies with anorectal malformations (ARM). Nevertheless, many specific aspects of CHD in ARM patients have yet to be studied. The aims of this study were to evaluate the prevalence and distribution of CHD in neonates-infants with ARM, and to explore whether the severity of ARM, and the presence of VACTERL association, had an impact on CHD rate, severity, and timing at first cardiac surgery.

STUDY DESIGN

All consecutive newborn-infants with ARM managed in our tertiary center (January-1999; December-2021) were collected from a prospective database and retrospectively analyzed. Prevalence and distribution of CHD in ARM patients were assessed. Patients were divided into groups depending on ARM severity and presence of VACTERL association. Pairwise comparison for CHD prevalence, severity, and timing at first cardiac surgery was performed between groups.

RESULTS

Of 396 ARM patients identified, those with severe ARM showed a higher number of overall CHD compared to patients with non-severe ARM (36.7 % vs. 25.2 %, p = 0.032). VACTERL + patients had a significantly higher prevalence of CHD (73.4 % vs. 16.4 %; p <0.001) and major CHD (51.7 % vs. 26.9 %; p = 0.008) when compared with VACTERL-patients. Furthermore, VACTERL + patients underwent first cardiac surgery at a significantly younger age than VACTERL-patients (5.2 ± 15.2 months vs. 11.9 ± 6.3, p = 0.039).

CONCLUSIONS

Patients with severe ARM had a higher number of CHD compared to patients with non-severe ARM. VATERL + patients had significantly more CHD and more severe CHD than VACTERL-patients. Early screening for CHD is strongly recommended in all newborns diagnosed with ARM before surgery.

LEVEL OF EVIDENCE

III retrospective comparative study.

Long-term (> 10 years) bowel function of anorectal malformations: a retrospective single-center study

PURPOSE

To describe the long-term bowel function of anorectal malformation (ARM) patients and explore the potential influence factors.

METHODS

ARM patients with follow-up data > 10 years were included. Cases of cloaca, Currarino syndrome, and VACTERL syndrome were excluded. Rintala score and PedsQL 4.0 were used to assess bowel function score (BFS) and quality of life (QoL). Based on the results, patients were divided into satisfactory group with BFS ≥ 17 and unsatisfactory group with it < 17. Comparisons between the groups were made.

RESULTS

Among the 81 patients were 44 males and 37 females. Follow-up time was 138 (126,151) months. 16 (19.75%) patients had associated anomalies. 23 (28.40%) patients had reoperations, and fistula recurrence was the most common reason. BFS of the patients was 20 (18,20). QoL score was 100 (100,100), which correlated positively with BFS (r = 0.648, P < 0.001). The satisfactory and the unsatisfactory groups had 69 and 12 cases, and their BFS were 20 (20,20) and 11 (8,15) respectively, which had statistical difference (P < 0.001). Total QoL score and psycho-social health score of the unsatisfactory group were lower (P < 0.001). Only reoperations were statistically different between the groups (P < 0.001).

CONCLUSIONS

Long-term (> 10 years) bowel function of ARM patients is good in this study. Defecation problems have negative impacts on QoL and mainly affects their psycho-social health. Primary anorectoplasty is extremely important. Reoperations, which are most commonly seen in recto-urethral fistula recurrence, adversely affect the outcome.

Prevalence and mortality among children with anorectal malformation: A multi-country analysis

PURPOSE

We examined the total prevalence, trends in prevalence, and age-specific mortality among individuals with anorectal malformation (ARM) METHODS: We conducted a retrospective cohort study using data from 24 population- and hospital-based birth defects surveillance programs affiliated with the International Clearinghouse for Birth Defects Surveillance and Research (ICBDSR) from 18 countries and for births from 1974 to 2014. We estimated pooled and program-specific total prevalence per 10,000 total births. Poisson regression was used to assess time trends in prevalence from 2001 to 2012 when most programs contributed data. We calculated selected age-specific proportions of deaths, stratified by case status RESULTS: The pooled total prevalence of ARM was 3.26 per 10,000 total births (95% Confidence Interval = 3.19, 3.32) for birth years 1974-2014. About 60% of cases were multiple or syndromic. Prevalence of multiple, syndromic, and stillborn cases decreased from 2001 to 2012. The first week mortality proportion was 12.5%, 3.2%, 28.3%, and 18.2% among all, isolated, multiple, and syndromic cases, respectively CONCLUSIONS: ARM is relatively rare, with multiple and syndromic cases showing decreasing prevalence during the study period. Mortality is a concern during the first week of life, and especially among multiple and syndromic cases. Our descriptive epidemiological findings increase our understanding of geographic variation in the prevalence of ARM and can be used to plan needed clinical services. Exploring factors influencing prevalence and mortality among individuals with ARM could inform future studies.

Embryology and anatomy of anorectal malformations

The etiology of anorectal malformations (ARM) is complicated because of the spectrum of anomalies seen clinically, many of which are isolated and seemingly unique. Recent studies suggest that ARMs result from abnormal cloacal membrane (CM) development that contributes to disrupt normal local muscle and nerve development. If CM maldevelopment is severe, the rectal pouch lies above the pelvic floor, resulting in asymmetric and/or deviated musculature, so a midline incision is likely to cause trauma or be detrimental. Autonomic nerve plexuses can be associated with a fistula tract in ARMs and are also at risk for damage during surgery and contribute to genitourinary complications. Understanding the anatomy and development of the perineum is crucial for treating the broad spectrum of anomalies associated with ARMs and may assist in predicting/managing other related morbidity.

Patient-reported physical and psychosocial significance of abdominal scarring in anorectal malformations

Background Abdominal scarring in patients with anorectal malformations (ARM) is a permanent visible sign of a chronic congenital condition. The study's aims were to assess the physical and psychosocial significance of abdominal scarring in ARM and to propose a scar treatment approach. Methods A patient- and observer reported cross-sectional study of ARM patients with previous colostomies surgically treated 1997-2015 with minimum 4 years' follow-up after stoma closure. A maximum of 3 patient-selected scars per patient were evaluated by a) the Patient and Observer Scar Assessment Scale (POSAS; 11= no symptoms, 110=worst symptoms), b) pictorial scar treatment assessment by a plastic surgeon, c) questionnaire evaluation of the scarring's psychosocial aspects, bowel- and urinary function and quality of life. Descriptive statistics were presented in median (range) and percent (%), and Pearson's r was used to evaluate linear correlations. Ethical approval and written consents were obtained. Results Twenty-seven patients (48% females) aged 12 (5-24) years old were included. Two (1-3) scars were evaluated per patient with a median POSAS score of 44 (15-78). Six patients (22%) reported scar pain, five (19%) scar pruritus and nine (33%) affected behavior, e.g. always wearing full-covered clothing in public places. Higher (worse) POSAS score and increasing age correlated (r = 0.40, p = 0.04). According to the plastic surgeon's assessment, 21 patients (78%) were suitable candidates for surgical scar treatment, among whom eight patients (30%) requested scar treatment. Conclusions Postoperative abdominal scarring should require attention in clinical ARM follow-up programs including potential corrective plastic surgery for selected patients.

Birth prevalence of anorectal malformations in England and 5-year survival: a national birth cohort study

OBJECTIVE

To determine the birth prevalence, maternal risk factors and 5-year survival for isolated and complex anorectal malformations.

DESIGN

National birth cohort using hospital admission data and death records.

SETTING

All National Health Service England hospitals.

PATIENTS

Live-born singletons delivered from 2002 through 2018, with evidence in the first year of life of a diagnosis of an anorectal malformation and repair during a hospital admission, or anorectal malformation recorded on the death certificate. Cases were further classified as isolated or complex depending on the presence of additional anomalies.

MAIN OUTCOME MEASURES

Birth prevalence of anorectal malformations per 10 000 live births, risk ratios for isolated and complex anorectal malformation by maternal, infant and birth characteristics, and 5-year survival.

RESULTS

We identified 3325 infants with anorectal malformations among 9 474 147 live-born singletons; 61.7% (n=2050) of cases were complex. Birth prevalence was 3.5 per 10 000 live births (95% CI 3.4 to 3.6). Complex anorectal malformations were associated with maternal age extremes after accounting for other sociodemographic factors. Compared with maternal ages 25-34 years, the risk of complex anorectal malformations was 31% higher for ≥35 years (95% CI 17 to 48) and 13% higher for ≤24 years (95% CI 0 to 27). Among 2376 anorectal malformation cases (n=1450 complex) born from 2002 through 2014, 5-year survival was lower for complex (86.9%; 95% CI 85.1% to 88.5%) than isolated anorectal malformations (98.2%; 95% CI 97.1% to 98.9%). Preterm infants with complex anorectal malformations had the lowest survival (73.4%; 95% CI 68.1% to 78.0%).

CONCLUSIONS

Differences in maternal risk factors for isolated and complex anorectal malformations may reflect different underlying mechanisms for occurrence. Five-year survival is high but lowest for preterm children with complex anorectal malformations.

Development of Sacral Ratio Percentile Card for Children: A Preliminary Report

INTRODUCTION

 Sacrospinal anomalies that may accompany anorectal malformations may cause fecal and urinary incontinence despite proper anomaly treatment. The sacral ratio has been suggested in the determination of both the prognosis in terms of incontinence and the need for further examination for sacrospinal anomalies. The normal and clinically decisive values of sacral ratio are given differently in publications. We aimed to determine the distribution of the sacral ratio in children under 12 months and to develop the sacral ratio percentile card that will enable one to give an age-independent parametric result in clinical evaluations.

MATERIALS AND METHODS

 The files of patients under 1 year of age who had anteroposterior direct radiography including pelvis were reviewed retrospectively. Sacral ratio was studied for 360 patients, 30 patients per month. Percentile card was developed with LMS software and reference values were used as 1, 2, 3, 4, and 10%.

RESULTS

 The lowest sacral ratio value was 0.514 and the highest value was 0.936. There was no statistical difference between the mean sacral ratio of the cases when they were classified on a monthly basis (p = 0.191). Low percentile values were found slightly different at first 4 months of age.

CONCLUSION

 Although the mean of sacral ratio does not change significantly during the first year of life, values that are considered pathological for patients are within different percentile limits depending on age. Instead of using sacral ratio with some clinically decisive values, we think that parametric evaluation with the help of the percentile card will increase its clinical value.

Gastrointestinal Emergency in Neonates and Infants: A Pictorial Essay

Gastrointestinal (GI) emergencies in neonates and infants encompass from the beginning to the end of the GI tract. Both congenital and acquired conditions can cause various GI emergencies in neonates and infants. Given the overlapping or nonspecific clinical findings of many different neonatal and infantile GI emergencies and the unique characteristics of this age group, appropriate imaging is key to accurate and timely diagnosis while avoiding unnecessary radiation hazard and medical costs. In this paper, we discuss the radiological findings of essential neonatal and infantile GI emergencies, including esophageal atresia and tracheoesophageal fistula, hypertrophic pyloric stenosis, duodenal atresia, malrotation, midgut volvulus for upper GI emergencies, and jejunoileal atresia, meconium ileus, meconium plug syndrome, meconium peritonitis, Hirschsprung disease, anorectal malformation, necrotizing enterocolitis, and intussusception for lower GI emergencies.

Multi-institutional review of bowel management strategies in children with anorectal malformations

BACKGROUND/RATIONALE

To describe current bowel management program (BMP) strategies in anorectal malformation (ARM) patients based on patient-level predictors using data from a multi-institutional consortium.

MATERIALS/METHODS

Patient bowel function and BMP were reviewed from Pediatric Colorectal and Pelvic Learning Consortium (PCPLC) data. The PCPLC is comprised of multidisciplinary specialists researching colorectal and pelvic disorders. Seven US institutions submitted de-identified clinical data on ARM patients into a centralized patient registry.

RESULTS

The primary ARM of 624 patients was categorized into Mild (45.2%), Moderate (40.4%) or Complex (14.2%) anomaly classifications. Patient-specific BMP were examined based on age and on the presence of spinal cord/sacral anomalies. 418 (67%) enrolled patients were prescribed BMP (<5 yo 56.4%; ≥5-<12 yo 86.7%; ≥12 81.5%). Constipation was the primary chief complaint (80.2%). Forty percent of patients on a BMP were toilet trained and approximately one-half (48.5%) reported daytime stool accidents. Secondary surgical interventions for antegrade continence enemas (ACE) were examined; 14.5% of patients employed ACE strategies and utilization increased with age and varied based on anatomic anomalies.

CONCLUSIONS

This is the first report on BMP strategies for patients with ARM from the Pediatric Colorectal and Pelvic Learning Consortium. Individual patient characteristics are explored for their impact on bowel management strategy utilization.

LEVEL OF EVIDENCE

IV.

Altered mRNA and lncRNA expression profiles in the striated muscle complex of anorectal malformation rats

BACKGROUND

Striated muscle complex (SMC) dysplasia has been confirmed to contribute to postoperative defecation dysfunction of patients with anorectal malformations (ARMs). To date, the potential molecular mechanisms of SMC dysplasia underlying the development of ARMs have not been clearly explained. This study examined the expression profiles of mRNAs and lncRNAs in the malformed SMC of ARM rats using RNA sequencing (RNA-seq).

METHODS

A rat model of ARMs was established by the intragastric administration of 1% ethylene thiourea (ETU) on an embryonic day 10 (E10). The rats were subjected to euthanasia and the SMC samples were collected on E19. The expression of mRNAs and lncRNAs was analyzed by RNA-seq on the Illumina HiSeq2500 platform. qRT-PCR was used to confirm the results of RNA-seq.

RESULTS

Compared with the levels in control rats, 1408 mRNAs and 472 lncRNAs were differentially expressed in the SMC of E19 ARM rats. GO and KEGG pathway analyses showed that the top enriched GO terms were mainly related to muscle development and the enriched pathways were associated with muscle and synaptic development. Protein-protein interaction network analysis was also performed using the STRING database. The network map revealed the interaction between the WNT3 protein and NTRK1, NTF4, MUSK, and BMP5 proteins. Finally, the qRT-PCR results further confirmed the RNA-seq data.

CONCLUSION

Our findings indicate the involvement of these dysregulated mRNAs and lncRNAs in the pathogenesis of SMC dysplasia in ARMs, providing a theoretical foundation for developing interventions to improve postoperative defecation function.

Spatiotemporal expression of neurogenic locus notch homolog protein 1 in developing caudal spinal cord of fetuses with anorectal malformations from ETU-fed rats

Complications, such as fecal soiling, incontinence, and constipation, are major health issues for patients with anorectal malformations (ARMs) after surgery. Dysplasia of the caudal spinal cord is an increasingly pivotal area in the field of postoperative complications for patients with ARMs. However, the existing research has not fully defined the mechanism underlying ARMs development. The neurogenic locus notch homolog (Notch) signaling pathway comprises several highly conserved proteins that are involved in spinal cord developmental processes. In the present study, the emerging role of Notch1 in fetal lumbosacral spinal cords was investigated in a rat model of ARMs using ethylene thiourea. Immunohistochemical staining, western blot and quantitative reverse transcription real-time polymerase chain reaction were utilized to analyze spatiotemporal expression of Notch1 on embryonic days (E) 16, E17, E19, and E21. The expression levels of the neuronal marker neurofilament and recombination signal-binding protein-J protein were evaluated for temporal correlations to Notch1 expression. The results implied that Notch1 expression was reduced in lumbosacral spinal cord neurons of ARMs embryos compared to control embryos. These results showed that, in ARMs embryos decreased Notch1 expression is related to the dysplasia of the caudal spinal cord during embryogenesis, indicating that Notch signaling may participate pathogenic embryonic lumbosacral spinal development and may be associated with postoperative complications of ARMs.

Experiences of Rectovaginal Fistula in Anorectal Malformation

BACKGROUND

Rectovaginal fistulas (RVFs) are very rare malformations in females with anorectal malformations (ARMs). Here, we share the clinical features of RVF and report the long-term outcomes.

METHODS

RVF patients were classified using a retrospective analysis of ARM patients who underwent operations at Seoul National University Hospital between January 1999 and May 2017. The Krickenbeck continence scoring system was used to evaluate bowel function 5 and 10 years after surgery.

RESULTS

Of the total 460 ARM patients, 203 were female, 7 of whom were diagnosed with RVF. The median age and weight at the time of anorectoplasty were 292 days (range, 140-617) and 8.2 kg (range, 5.5-12), respectively. Six patients had associated anomalies and three patients underwent redo-anorectoplasty. Voluntary bowel movements were observed in 6 out of 7 patients at 5 and 10 years of age. Soiling was observed in all patients at the age of five years and in 6 out of 7 patients at the age of ten years. Constipation was observed in 6 out of 7 patients at both five and ten years of age.

CONCLUSIONS

An RVF is a very rare malformation, accounting for 1.5% of total ARMs and 3.4% of ARMs in females. Long-term counseling, education, and guidance are needed for effective management of patients' bowel movements.

TYPE OF STUDY

Prognosis study LEVEL OF EVIDENCE: Level IV.

General complications after surgery for anorectal malformations

The introduction of posterior sagittal anorectoplasty (PSARP) by deVries and Peña in the early 80s has impacted to the treatment of patients with anorectal malformations (ARM). It gained great recognition worldwide in a very short time, and since then, surgeons dealing with the treatment of this complex malformation could achieve tremendous progress in contemporary management of this anomaly. Despite the growing experience and body of information globally, the treatment of ARMs continues to be a challenge to the pediatric surgeons due to the nature and the variability of the anomaly, and short- and long-term problems continue to exist even after nearly 40 years of the PSARP era. Today, knowing more about it, pediatric surgeons are committed to do more for their ARM patients to have them as physically and socially healthy individuals.

Anorectal malformation patients' outcomes after definitive surgery using Krickenbeck classification: A cross-sectional study

Background

The survival of anorectal malformation (ARM) patients has been improved in the last 10 years because of the improvement in management of neonatal care and surgical approaches for ARM patients. Thus, the current management of ARM patients are focusing on the functional outcomes after definitive surgery. Here, we defined the type of ARM and assessed the functional outcomes, including voluntary bowel movement (VBM), soiling, and constipation, in our patients following definitive surgery using Krickenbeck classification.

Methods

We conducted a cross-sectional study to retrospectively review medical records of ARM patients who underwent a definitive surgery at Dr. Sardjito Hospital, Indonesia, from 2011 to 2016.

Results

Forty-three ARM patients were ascertained in this study, of whom 30 males and 13 females. Most patients (83.7%) were normal birth weight. There were ARM without fistula (41.9%), followed by rectourethral fistula (25.5%), perineal fistula (18.6%), vestibular fistula (9.3%), and rectovesical fistula (4.7%). The VBM was achived in 53.5% patients, while the soiling and constipation rates were 11.6% and 9.3%, respectively. Interestingly, patients with normal birth weight showed higher frequency of VBM than those with low birth weight (OR = 9.4; 95% CI = 1.0–86.9; p = 0.04), while male patients also had better VBM than females (OR = 3.9; 95% CI = 1.0–15.6) which almost reached a significant level (p = 0.09). However, VBM was not affected by ARM type (p = 0.26). Furthermore, there were no significant associations between gender, birth weight, and ARM type with soiling and constipation, with p-values of 1.0, 1.0, and 0.87; and 0.57, 1.0, and 0.94, respectively.

Conclusions

Functional outcomes of ARM patients in our hospital are considered relatively good with more than half of children showing VBM and only relatively few patients suffering from soiling and constipation. The frequency of VBM might be associated with birth weight and gender, but not ARM type, while the soiling and constipation did not appear to be correlated with birth weight, gender, nor ARM type. Further multicenter study is necessary to compare our findings with other centers.

Can fecal continence be predicted in patients born with anorectal malformations?

PURPOSE

The purpose of this study was to identify factors associated with attaining fecal continence in children with anorectal malformations (ARM).

METHODS

We performed a multi-institutional cohort study of children born with ARM in 2007-2011 who had spinal and sacral imaging. Questions from the Baylor Social Continence Scale were used to assess fecal continence at the age of ≥4 years. Factors present at birth that predicted continence were identified using multivariable logistic regression.

RESULTS

Among 144 ARM patients with a median age of 7 years (IQR 6-8), 58 (40%) were continent. The rate of fecal continence varied by ARM subtype (p = 0.002) with the highest rate of continence in patients with perineal fistula (60%). Spinal anomalies and the lateral sacral ratio were not associated with continence. On multivariable analysis, patients with less severe ARM subtypes (perineal fistula, recto-bulbar fistula, recto-vestibular fistula, no fistula, rectal stenosis) were more likely to be continent (OR = 7.4, p = 0.001).

CONCLUSION

Type of ARM was the only factor that predicted fecal continence in children with ARM. The high degree of incontinence, even in the least severe subtypes, highlights that predicting fecal continence is difficult at birth and supports the need for long-term follow-up and bowel management programs for children with ARM.

TYPE OF STUDY

Prospective Cohort Study.

LEVEL OF EVIDENCE

II.

Lack of disparities in screening for associated anomalies in children with anorectal malformations

INTRODUCTION

Patients with anorectal malformations (ARM) often have associated congenital anomalies and should undergo several screening exams in the first year of life. We hypothesized that racial and socioeconomic disparities exist in the screening processes for these patients.

METHODS

After IRB approval, a retrospective review of patients with ARM born between 2005 and 2016 was performed at a quaternary care children's hospital. Demographics including gender, race, insurance, and zip code were collected. Zip code was used as a surrogate for median income. Chart review was performed to identify anomaly type and whether Vertebral defects, Anorectal malformations, Cardiac defects, Tracheo-Esophageal fistula, Renal anomalies, and Limb abnormalities screening was performed within 1 y of age. Descriptive statistics and chi square analyses were performed.

RESULTS

One hundred patients (59% male, 68% low malformation) were identified. African American and Caucasian subjects represented 41% and 40% of the population, respectively. Overall, 68 of 100 patients had at least one screening test for each of the Vertebral defects, Anorectal malformations, Cardiac defects, Tracheo-Esophageal fistula, Renal anomalies, and Limb abnormalities associations. Although some minor differences were noted (more African Americans received skeletal survey than Caucasians, 80.5% versus 60%, P = 0.00335), no pattern of systematic bias in the receipt or timing of screening was evident based on race, insurance, or income.

CONCLUSIONS

There do not appear to be racial or socioeconomic disparities in screening for associated anomalies in patients with ARM. However, overall gaps in screening still exist, and work must be carried out to appropriately screen all patients for associated anomalies.

Integrating lncRNAs and mRNAs expression profiles in terminal hindgut of fetal rats with anorectal malformations

BACKGROUND

The detailed embryonic etiology and pathogenesis of anorectal malformations (ARMs) remains unclear. Recent studies have shown that gene expression abnormalities were the key factors that result in ARMs. Long non-coding RNAs (lncRNAs) were reported as the 'transcriptional noise' within the genome. The expression profiles of lncRNA and mRNA remain less characterized in the pathogenesis of ARMs. Furthermore, the function of lncRNAs in the regulation of this process has not been investigated so far. Therefore, this current study was aimed to integrate lncRNA and mRNA expression profiles in terminal hindgut of ethylenethiourea (ETU)-induced ARM rats using Agilents lncRNA and mRNA co-expression microarrays.

METHODS

ARM model was induced with ethylenethiourea (ETU) on gestational day 10. Cesarean deliveries were conducted to collect the embryos on gestational day 20. For the extraction of total RNA, 1-cm terminal hindgut tissues were collected from three fetal rats with similair weights. The microarrays and quantitative RT-PCR analysis were conducted to evaluate the lncRNA and mRNA expression profiles in normal fetal rats and ARM fetal rats.

RESULTS

Compared with control group, 164 lncRNAs were observed to be aberrantly expressed (FC ≥ 2; P < 0.05) in ARM group, including 36 upregulated and 128 downregulated, while 772 mRNAs were observed to be aberrantly expressed (FC ≥ 2; P < 0.05) in the terminal hindgut, including 350 up-regulated and 422 down-regulated. The differential expression profiles between the ARM and the control group were used for gene ontology (GO) and pathway analysis. A subset of those RNAs was identified to be closely related to the development process of ARMs. The four RNAs that were differentially expressed between the two groups were selected for qPCR validation, and the results were in line with the microarray data. In addition, the lncRNAs and mRNA co-expression network was established according to the correlation analysis. We predicted the functions of transregulatory lncRNAs by the TFs (transcription factors) which might modulate their expression. In the core network of lncRNA-TF pairs, the lncRNAs can be classified into 5 categories of pathways governed by Jun, c-Myc, Usf1, Alf2, and Stat3.

CONCLUSION

From the above results, it can be suggested that these aberrant lncRNAs might participate in the pathogenesis of ARM, and our present work may provide new research directions for future studies of ARMs.

Screening practices and associated anomalies in infants with anorectal malformations: Results from the Midwest Pediatric Surgery Consortium

BACKGROUND

This study evaluates screening practices and the incidence of associated anomalies in infants with anorectal malformations (ARM).

METHODS

We performed a multi-institutional retrospective cohort study of children born between 2007 and 2011 who underwent surgery for ARM at 10 children's hospitals. ARM type was classified based on the location of the distal rectum, and all screening studies were reviewed.

RESULTS

Among 506 patients, the most common ARM subtypes were perineal fistula (40.7%), no fistula (11.5%), and vestibular fistula (10.1%). At least 1 screening test was performed in 96.6% of patients, and 11.3% of patients underwent all. The proportion of patients with ≥1 abnormal finding on any screening test varied by type of ARM (p<0.001). Screening rates varied from 15.2% for limb anomalies to 89.7% for renal anomalies. The most commonly identified anomalies by screening category were: spinal: tethered cord (20.6%); vertebral: sacral dysplasia/hemisacrum (17.8%); cardiac: patent foramen ovale (58.0%); renal: hydronephrosis (22.7%); limb: absent radius (7.9%).

CONCLUSION

Screening practices and the incidence of associated anomalies varied by type of ARM. The rate of identifying at least one associated anomaly was high across all ARM subtypes. Screening for associated anomalies should be considered standard of care for all ARM patients.

TYPE OF STUDY

Multi-institutional retrospective cohort study.

LEVEL OF EVIDENCE

III.

Underdiagnosis of Mild Congenital Anorectal Malformations

OBJECTIVE

To determine whether the frequency and severity of congenital anorectal malformations (CARMs) differs by sex.

STUDY DESIGN

We included 129 patients (0-319 weeks old) diagnosed with CARMs, who had been referred to our Department of Pediatric Surgery between 2004 and 2013. Rectoperineal and rectovestibular fistulas were classified as mild CARMs, all others as severe. If a patient was diagnosed with CARM within 48 hours after birth, this was considered an early diagnosis, all others as late.

RESULTS

Seventy-five (58%) girls and 54 (42%) boys were diagnosed with different forms of CARM. More patients had mild rather than severe forms of CARM (67% and 33%, respectively, P <.001). We found that 89% of girls had a mild form of CARM, whereas 65% of boys had severe forms (P <.001). All severe forms were diagnosed early, whereas 54% mild forms were diagnosed early and 46% were diagnosed late.

CONCLUSIONS

Girls more often have mild forms of CARM, whereas boys more often have severe forms. Overall, the distribution across the sexes is equal. Because chronic constipation can be the only symptom of mild CARMs, it often requires more time to diagnose than severe forms. Many women are, therefore, diagnosed with CARMs at an older age, or they may go undiagnosed altogether. Subsequently, these women have a greater risk of full rupture during vaginal delivery.

Congenital Anorectal Malformation Severity Does Not Predict Severity of Congenital Heart Defects

OBJECTIVE

To determine the prevalence of congenital heart defects (CHDs) in patients with mild or severe congenital anorectal malformations (CARMs), and whether all patients with CARM need pediatric cardiology screening.

STUDY DESIGN

We included 129 patients with CARM born between 2004 and 2013, and referred to University Medical Center Groningen. Recto-perineal and recto-vestibular fistulas were classified as mild CARMs, all others as severe. Significant patent foramen ovale, secundum atrial septal defect, and small ventricular septum defect were classified as minor CHDs, all others as major.

RESULTS

Of 129 patients with CARM, 67% had mild CARM, 33% severe CARM, and 17% were additionally diagnosed with CHD. CHDs were distributed equally in patients with mild or severe CARMs. Patients with multiple congenital abnormalities were more frequently diagnosed with CHD (n = 16, 36%) than patients without multiple congenital malformations (n = 5, 9%, P = .001). Patients with CARM diagnosed with CHD using pediatric cardiac echo screening were younger than 3 months of age at diagnosis. Earlier general pediatric examinations missed 7 (50%) children with mild and 4 (50%) with severe CHDs.

CONCLUSIONS

The severity of CARM could predict neither prevalence nor severity of CHD. More than one-half of CHDs were missed during the first physical examination. No new CHDs were found in patients older than 3 months of age at the time CARMs were diagnosed. We recommend screening all patients with CARM younger than 3 months of age for CHD at the time CARM is diagnosed. Preoperative echocardiography should be the rule in children younger than 3 months of age and with multiple congenital anomalies.

Long-term evaluation of fecal continence and quality of life in patients operated for anorectal malformations

Summary Introduction: Patients operated for correction of anorectal malformations (ARM) can develop fecal incontinence, constipation, and soiling, with loss in quality of life. Objective: To evaluate, through the use of questionnaires, fecal continence, and quality of life of children in the late postoperative follow-up of ARM correction, both high and low. In addition, the levels of fecal continence and quality of life were compared with those of a control group. Method: A Fecal Continence Index Questionnaire (ICF) and a Questionnaire for Assessment of Quality of Life Related to Fecal Continence in Children and Adolescents (QQVCFCA) were administered to 63 patients with ARM, aged from 7 to 19 years, whose surgical treatment had been completed for at least 6 months. The patients were compared to a control group of 59 children. Results: In the control group, 25 (42.4%) patients had good continence and 34 (57.6%), normal continence. We found that the quality of life in children with ARM is compromised globally, in all areas and in the ICF questionnaire, compared to controls (p<0.001). There was no difference between patients with high and low defects. Thirty-two (50.8%) patients had other associated anomalies. Conclusion: In patients operated for ARM correction, quality of life and ICF were compromised, and there was no difference between patients with high-type and low-type of the disease. In about half the cases there are other associated malformations.

Spinal cord anomalies in patients with anorectal malformations without severe sacral abnormalities or meningomyelocele: outcomes after expectant, conservative management

OBJECTIVE The goal of this study was to determine the significance of spinal cord anomalies (SCAs) in patients with anorectal malformations (ARMs) by comparing the outcomes for bowel function, lower urinary tract symptoms (LUTS), and lower-limb neurological abnormalities to these outcomes in patients with similar ARMs and a normal spinal cord. METHODS The spinal cord MRI records of female patients treated for vestibular and perineal fistula (VF/PF) and male patients with rectourethral fistula (RUF) at a single center between 1983 and 2006 were reviewed. Bowel function and LUTS were assessed by questionnaire. Patients with extensive sacral anomalies or meningomyelocele were excluded. RESULTS Of 89 patients (median age 15 years, range 5-29 years), MRI was available in 90% (n = 80; 40 male patients with RUF), and 80% of patients returned the questionnaire (n = 64; 31 male patients with RUF). Spinal cord anomalies were found in 34%, comprising a filum terminale lipoma in 30%, low conus medullaris in 10%, and thoracolumbar syrinx in 6%. Bowel functional outcomes between patients with SCAs (n = 23) and those with a normal spinal cord (n = 41) were not significantly different for soiling (70% vs 63%), fecal accidents (43% vs 34%), and constipation (57% vs 39%; p = not significant for all). The LUTS, including urge (65% vs 54%), urge incontinence (39% vs 24%), stress incontinence (17% vs 22%), and straining (32% vs 29%) were also comparable between groups (p = not significant for all). No patients developed lower-limb neurological abnormalities. CONCLUSIONS The results suggest that the long-term functional outcomes for patients with SCAs who had VF/PF and RUF may not differ significantly from patients with the same type of ARMs and a normal spinal cord. The results favor a conservative approach to their management in the absence of abnormal neurological findings in the lower limbs.

Can we expect a favorable outcome after surgical treatment for an anorectal malformation?

BACKGROUND

The aim of this study was to retrospectively review the classification, surgical experience, and the functional outcome of anorectal malformations (ARMs) according the type of ARM.

METHODS

A total of 311 children (M:F=200:111) who underwent surgical treatment for ARM between 1990 and 2011 were reviewed. Functional outcomes were evaluated using the Krickenbeck classification. The mean follow-up period was 112.2 ± 76.7months (range: 36.8-414.9months).

RESULTS

In the male patients, 90 (45%) had perineal fistulas, 60 (30%) had urethral fistulas, and 7 (3.5%) had rectovesical fistulas. There were 17 cases of ARM without a fistula (8.5%), and we could not determine the type of fistula in 26 boys (13%) because of follow-up losses and death. In the female patients, 34 (30.6%) had perineal fistulas, 71 (64%) had rectovestibular fistulas, and 2 (1.8%) had rectovaginal fistulas. Four patients did not have a fistula (3.6%). For 264 patients, we did anoplasty (121 cases), fistula transposition (14 cases), and posterior sagittal anorectoplasty (PSARP, 129 cases). We found that 224 (84.8%) patients showed voluntary bowel movements. The overall rate for constipation was 30.7% and for soiling was 6.5%. The continence outcome was good for 82.2% of children, fair for 2.7%, and poor for 15.2%. For rectovestibular fistulas, constipation was higher in the perineal operation group, but the continence outcome was similar.

CONCLUSION

Through a review of 20years' experience, an accurate diagnosis based on the Krickenbeck classification and operations following the principles of PSARP are crucial to achieve a good functional outcome in children with an ARM.

Laparoscopic approach in the management of anorectal malformations

Seventeen years have passed since the first description of the laparoscopic approach for anorectal malformation and approximately 68 articles have been published on the subject. In this review article, we aim to describe the advantages as well as the indications and contraindications of this approach when dealing with each specific type of anorectal malformation, according to what has been described in the literature and to our own experience. The ideal and undisputable indication for laparoscopy remains for cases in which the abdomen needs to be entered to repair the malformation. Only 10% of male patients with anorectal malformation are born with a recto-bladder neck fistula that requires an abdominal approach, this represents an ideal indication for laparoscopy. In females, only the complex cloacae with a common channel length greater than 3 cm are the ones that require a laparotomy; they represent about 30% of the cloacae. However, the repair of this type of cloacae also requires sophisticated and technically demanding maneuvers that have never been done laparoscopically. In cases of recto-urethral prostatic fistulas the malformation can be repaired either way: laparoscopically or posterior sagitally. In all other malformations: recto-perineal fistula, recto-urethral bulbar fistula, anorectal malformation without fistula, rectal atresia, recto-vestibular fistula; no justification for laparoscopy could be found; and in some cases, laparoscopy is contraindicated. In the published reports, there is no evidence supporting the idea that laparoscopic repair results in better functional results when compared with non-laparoscopic operation; there is a tendency to omit information relevant to bowel control such as the characteristics of the sacrum and the presence or absence of tethered cord; and most authors do not compare results between comparable malformations.

Long-term bowel functional outcomes in rectourethral fistula treated with PSARP: controlled results after 4-29 years of follow-up: a single-institution, cross-sectional study

BACKGROUND/PURPOSE

Posterior sagittal anorectoplasty (PSARP) has become the standard surgical treatment for males rectourethral fistula (RUF) at most surgical centers worldwide. We aimed to define the long-term bowel functional outcomes following PSARP for RUF at our institution between 1983 and 2006, with comparison to age- and gender-matched controls.

METHODS

Patients were invited to answer a detailed, previously validated Bowel Function Score (BFS) questionnaire by post. Respondents were matched by age and gender to three controls from the general population who had answered identical questionnaires. Case records were reviewed retrospectively for operative details. Ethical approval was obtained. Social continence was defined as soiling or fecal accidents <1/week and no requirement for changes of underwear or protective aids.

RESULTS

Of 34 (79%) respondents (median age 19 (range, 4-29) years), 74% had voluntary bowel movements (VBMs), 24% were reliant on anterograde continence enema (ACE) washouts, and 1 patient had a colostomy. Impairment of bowel function was significantly higher in all aspects of fecal control among patients than controls (p<0.001). A statistically significant decline in fecal accidents and soiling was observed with age (p ≤ 0.03). Thirty-one percent of patients with VBMs had constipation managed with diet or laxatives (vs 2% of controls, p=0.0002). Of patients with VBMs followed up for > 12 years (n=20), 50% were completely continent (vs 73% of controls; p=NS). Overall, 76% of respondents were socially continent with or without artificial means in the form of ACE washouts. By BFS score, 39% had a good functional outcome, 27% had a moderate outcome, 9% had a clearly poor score and 24% were living with an ACE.

CONCLUSIONS

Our results suggest that in the long-term, functional symptoms remain highly prevalent among patients treated for RUF with PSARP. However, the majority can be expected to achieve social continence, although for some this will require intervention with ACE bowel management. Approximately one third may report VBMs and complete continence.

Complete VACTERL evaluation is needed in newborns with rectoperineal fistula

PURPOSE

Given that a rectoperineal fistula is developmentally the most mature lesion in the spectrum of anorectal malformations, it is not clear whether it merits a complete VACTERL evaluation. We sought to determine if the same evaluation is required to rule out associated anomalies in newborns with rectoperineal fistula as those with more complex anorectal malformations.

METHODS

We performed a retrospective review of the pediatric colorectal center database at our tertiary care children's hospital from 2000 to 2012. Patients with anorectal malformations were categorized as rectoperineal fistula or "other" using the Krickenbeck classification. Records were reviewed to identify associated anomalies.

RESULTS

308 patients (156 males) were treated at our institution during the time period (rectoperineal fistula=102). Thirty-five (34%) patients with a perineal fistula had at least one associated anomaly. The most common anomalies were cardiac lesions (29% excluding PFO and PDA), genitourinary (20.6%), and malformations of the spine (15.7%). The overall occurrence of anomalies was lower than the "other" group.

CONCLUSION

Our review demonstrates that newborns with a rectoperineal fistula frequently have associated anomalies and should undergo an evaluation similar to more complex lesions. These findings illustrate the importance of a structured approach to the evaluation of even the most straightforward lesions.

Anorectal malformation associated with a mutation in the P63 gene in a family with split hand-foot malformation

PURPOSE

The aims of this study were to identify the mutation gene of a Chinese family with anorectal malformation (ARM) associated with split hand-foot malformation and to determine the spatiotemporal expression of the mutated gene during hindgut and anorectum development in human embryos.

METHOD

A Chinese family with intrafamilial clinically variable manifestation was analyzed and primers were designed for exons 3-14 of P63, DLX5, DLX6, DAC, and HOXD13 as candidate genes and direct sequence analysis of the exons was performed. Immunohistochemical study of mutated gene in the hindgut and anorectum of human embryos of 4th-10th weeks was performed.

RESULT

Affected individuals were found to have an Arg227Gln P63 gene mutation. From the 4th-10th weeks of gestation of the human embryo, the P63-positive cells were mainly located on the epithelium of the apical urorectal septum, hindgut, and cloacal membrane. After the anorectum ruptured during the 8th week, the P63 remained strongly immunoreactive on the epithelium of the anal canal and urethra, but the mucous membrane of the rectum exhibited no reaction.

CONCLUSIONS

The mutation identified strongly suggests a causal relationship between the ARM phenotype and P63. The expression of P63 was persistently active during the dynamic and incessant septation of the cloaca and hindgut, suggesting that P63 may play a pivotal role in the morphogenesis of the hindgut and anorectum.