Hirschsprung's disease. Evaluation of mortality and long-term function in 260 cases

State of the Art Bowel Management for Pediatric Colorectal Problems: Hirschsprung Disease

After an initial pull-though, patients with Hirschsprung disease (HD) can present with obstructive symptoms, Hirschsprung-associated enterocolitis (HAEC), failure to thrive, or fecal soiling. This current review focuses on algorithms for evaluation and treatment in children with HD as a part of a manuscript series on updates in bowel management. In constipated patients, anatomic causes of obstruction should be excluded. Once anatomy is confirmed to be normal, laxatives, fiber, osmotic laxatives, or mechanical management can be utilized. Botulinum toxin injections are performed in all patients with HD before age five because of the nonrelaxing sphincters that they learn to overcome with increased age. Children with a patulous anus due to iatrogenic damage of the anal sphincters are offered sphincter reconstruction. Hypermotility is managed with antidiarrheals and small-volume enemas. Family education is crucial for the early detection of HAEC and for performing at-home rectal irrigations.

Abnormal enteric nervous system and motor activity in the ganglionic proximal bowel of Hirschsprung's disease

Hirschsprung's disease (HSCR) is a congenital defect in which the enteric nervous system (ENS) does not develop in the distal bowel, requiring surgical removal of the portions of bowel without ENS ganglia ('aganglionic') and reattachment of the 'normal' proximal bowel with ENS ganglia. Unfortunately, many HSCR patients have persistent dysmotility (e.g., constipation, incontinence) and enterocolitis after surgery, suggesting that the remaining bowel is not normal despite having ENS ganglia. Anatomical and neurochemical alterations have been observed in the ENS-innervated proximal bowel from HSCR patients and mice, but no studies have recorded ENS activity to define the circuit mechanisms underlying post-surgical HSCR dysfunction. Here, we generated a HSCR mouse model with a genetically-encoded calcium indicator to map the ENS connectome in the proximal colon. We identified abnormal spontaneous and synaptic ENS activity in proximal colons from GCaMP-Ednrb ^-/- mice with HSCR that corresponded to motor dysfunction. Many HSCR-associated defects were also observed in GCaMP-Ednrb ^+/- mice, despite complete ENS innervation. Results suggest that functional abnormalities in the ENS-innervated bowel contribute to post-surgical bowel complications in HSCR patients, and HSCR-related mutations that do not cause aganglionosis may cause chronic colon dysfunction in patients without a HSCR diagnosis.

Anal canal and sphincter function in children with Hirschsprung disease after definitive surgery

INTRODUCTION

Anorectal manometry may be useful to objectively evaluate anorectal function following definitive pullthrough for Hirschsprung Disease (HD) but there is little published data. Our study aims to investigate anorectal manometry findings and their association with bowel function.

METHODOLOGY

This was a prospective observational study. Convenience sampling method was used to recruit all HD patients who had definitive pullthrough from January 2019 to December2020 in our institution. High-resolution anorectal manometry (HRAM) was used to record anal resting pressure (ARP), length of high-pressure zone (HPZ), and presence/absence of recto-anal inhibitory reflex (RAIR). The Paediatric Incontinence/Constipation Scoring System (PICSS) was scored for all participants. PICSS is a validated questionnaire with scores mapped to an age-specific normogram to denote constipation, incontinence, and their combinations. Non-parametric and chi-square tests at significance p<0.05 were conducted to examine the relationship between PICSS categories and manometry findings. Ethical approval was obtained.

RESULTS

There were 32 participants (30 boys). Median age at participation was 26.5 months (range: 13.8-156). Twenty-four (75%) had transanal pullthrough, 8(25%) underwent Duhamel procedure. PICSS scored 10(31.3%) as normal, 8(25%) as constipation, 10(31.3%) as incontinent, and 4(12.5%) as mixed. RAIR was present in 12 patients (37.5%). HPZ, maximum ARP, mean ARP were comparable across all PICSS groups without statistically significant differences. Presence of RAIR was not significantly associated with any PICSS groups (p = 0.13).

CONCLUSION

Bowel function does not appear to be significantly associated with HRAM findings after definitive pullthrough for HD, but our study is limited by small sample size. RAIR was present in 37.5% patients after pullthrough.

LEVEL OF EVIDENCE

Level II.

The Technique of Mobilization of the Colon for Pull-Through Procedure in Hirschsprung’s Disease

Background

In patients with Hirschsprung's disease (HD), persistent obstructive symptoms may develop after surgery. The causes of mechanical obstruction may be a retraction of the pulled-through bowel due to insufficient mobilization of the mesentery or impaired blood supply in the area of the coloanal anastomosis in the case of excessive ligation of the supplying vessels. Leakage and stenosis are formidable complications and require repeated surgical intervention.

Objective

The purpose of this study is to describe our experience and short-term results of the developed method: mobilization of the descending colon for its pull-through during the surgical treatment of the children with HD, which allows ensuring good mobility to the descending colon and maintaining blood supply at the same time.

Methods

The medical records of 20 patients with rectosigmoid HD, who underwent parietal mobilization of the descending colon with preservation of the marginal artery, sigmoid arteries, and ligation of the left colon artery, were reviewed. This method is aimed at increasing the mobility of the brought-down bowel and maintaining the blood supply to the distal part of the brought-down bowel not only from the superior mesenteric artery but also from the lower one.

The SPSS Statistics 26.0 package was used for statistical analysis. To describe the analyzed data with a normal distribution, the mean values and the error of the mean were used. To determine the differences, Student’s t-test was used, and the differences were considered significant at a significance level of p &lt; 0.05.

Results

In all patients, the postoperative period was uneventful, without complications. The patients were discharged for outpatient treatment on average on the seventh day after the surgery. In all cases, there were no signs of anastomotic leakage or stricture on follow-up after 6–12 months.

Conclusion

The method of mobilization of the colon in the rectosigmoid form of HD, parietal mobilization of the descending part of the colon preserving the marginal artery, sigmoid arteries, and ligating the left colon artery, can reduce the risk of complications by eliminating the tension of the descending colon.

Total Colonic Aganglionosis in Hirschsprung disease

Total Colonic Hirschsprung Disease (HD) can be challenging from a diagnostic and management standpoint and occurs in around 8% of cases of HD. Long term outcomes are difficult to compare due to variation in length of aganglionosis, chosen surgical techniques, and terminology utilized in the literature. In this review we highlight some of the management controversies and clinical challenges and emphasize future areas of suggested collaboration and research.

The prevalence and clinical presentation of Hirschsprung's disease in preterm infants: a systematic review and meta-analysis

PURPOSE

Hirschsprung's disease (HD) is a rare occurrence in premature infants, and the exact prevalence varying across studies. Thus, we conducted this study to determine the prevalence of and clinical presentation of HD in preterm infants.

METHODS

The PubMed, EmBase, and Cochrane library databases were searched for eligible studies throughout May 2021. The pooled incidence with 95% confidence interval (CI) was calculated using the random-effects model.

RESULTS

Thirty studies involved 4,557 children with HD were included. The pooled proportion of HD patients who were preterm infants was 7% (95% CI 5-8%; P < 0.001); the sensitivity analysis indicated that the pooled prevalence of preterm infants with HD ranged from 5.0% to 5.6%. Moreover, the pooled incidence of abdominal distention in HD patients was 83% (P < 0.001), that of vomiting was 61% (P < 0.001), that of bilious vomiting was 54% (P < 0.001), that of delayed meconium passage was 48% (P < 0.001), that of constipation was 44% (P < 0.001), and that of enterocolitis was 13% (P < 0.001).

CONCLUSIONS

This study reported the prevalence of HD patients who were preterm infants, and the most common presentations were abdominal distention, vomiting, bilious vomiting, delayed meconium passage, constipation, and enterocolitis.

The utilization of botulinum toxin for Hirschsprung disease

Patients with Hirschsprung disease (HD) can struggle with persistent obstructive symptoms even after a successful pull-through. These symptoms lead to stasis of stool and can result in Hirschsprung associated enterocolitis (HAEC). Recurrent episodes of HAEC warrant further workup; if there are no signs of mechanical obstruction or an aganglionic pull-through, the use of botulinum toxin injections to the internal anal sphincter has been utilized to relieve these symptoms. In this review, we describe the variations in botulinum toxin injection use and describe ongoing studies to prevent obstructive symptoms and Hirschsprung-associated enterocolitis (HAEC). Botulinum toxin injection utilization has been described for obstructive symptoms after HD pull-through, in the setting of active HAEC, and has been proposed to be part of the treatment algorithm for prevention of HAEC after pull-through. Dosing utilized for the injections, along with the complications, are also described. Prospective, multi-institutional trials are needed to identify the effectiveness of botulinum toxin injections in the outpatient/prophylactic setting as current data suggest some benefits in preventing future obstructive symptoms; however, other studies have conflicting results.

Current understanding of Hirschsprung-associated enterocolitis: Pathogenesis, diagnosis and treatment

Hirschsprung-associated enterocolitis (HAEC) was described in 1886 by Harald Hirschsprung and is a potentially deadly complication of Hirschsprung Disease. HAEC is classically characterized by abdominal distension, fever, and diarrhea, although there can be a variety of other associated symptoms, including colicky abdominal pain, lethargy, and the passage of blood-stained stools. HAEC occurs both pre-operatively and post-operatively, is the presenting symptom of HSCR in up to 25% of infants and varies in overall incidence from 20 to 60%. This article reviews our current understanding of HAEC pathogenesis, diagnosis, and treatment with discussion of areas of ongoing research, controversy, and future investigation.

Benzophenone-3 induced abnormal development of enteric nervous system in zebrafish through MAPK/ERK signaling pathway

Hirschsprung disease (HSCR) is a congenital disease characterized by the absence of enteric neurons, which is derived from the failure of the proliferation, differentiation or migration of the enteric neural crest cells (ENCCs). HSCR is associated with multiple risk factors, including polygenic inheritance factors and environmental factors. Genetic studies have been extensively performed, whereas studies related to environmental factors remain insufficient. Benzophenone-3 (BP-3), one important component of the ultraviolet (UV) filters, has been proved to have cytotoxicity and neurotoxicity which might be associated with HSCR. In this study, we used zebrafish as a model to investigate the relationship between BP-3 exposure and the development of the enteric nervous system (ENS) in vivo. Embryos exposed to BP-3 showed an average of 46% reduction of the number of the enteric neurons number. Besides, the ENCCs specific markers (ret and hand2) were downregulated upon BP-3 exposure. Moreover, we identified potential targets of BP-3 through Network Pharmacology Analysis and Autodock and demonstrated that the attenuation of the MAPK/ERK signaling might be the potential mechanism underlying the inhibition of the ENS development by BP-3. Importantly, MAPK/ERK signaling agonist could be used to rescue the ENS defects of zebrafish induced by BP-3. Overall, we characterized the influence of BP-3 on ENS development in vivo and explored possible molecular mechanisms.

Outpatient Botulinum Injections for Early Obstructive Symptoms in Patients with Hirschsprung Disease

INTRODUCTION

Botulinum toxin (BT) injections may play a role in preventing Hirschsprung associated enterocolitis (HAEC) episodes related to internal anal sphincter (IAS dysfunction). Our aim was to determine the association of outpatient BT injections for early obstructive symptoms on the development of HAEC.

METHODS

A retrospective review of children who underwent definitive surgery for Hirschsprung disease (HSCR) from July 2010 - July 2020 was performed. The timing from pull-through to first HAEC episode and to first BT injection was recorded. Primary analysis focused on the rate of HAEC episodes and timing between episodes in patients who did and did not receive BT injections.

RESULTS

Eighty patients were included. Sixty patients (75%) were male, 15 (19%) were diagnosed with trisomy 21, and 58 (72.5%) had short-segment disease. The median time to pull-through was 150 days (IQR 16, 132). Eight patients (10%) had neither an episode of HAEC or BT injections and were not included in further analysis. Forty-six patients (64%) experienced at least one episode of HAEC, while 64 patients (89%) had at least one outpatient BT injection. Compared to patients who never received BT injections (n = 9) and those who developed HAEC prior to BT injections (n = 35), significantly fewer patients who received BT injections first (n = 28) developed enterocolitis (P < 0.001), with no patient developing more than one HAEC episode.

CONCLUSION

Outpatient BT is associated with decreased episodes of HAEC and increased interval between HAEC episodes requiring inpatient treatment. Scheduling outpatient BT injections to manage obstructive symptoms may be beneficial after pull-through for HSCR.

Management and outcomes for long-segment Hirschsprung disease: A systematic review from the APSA Outcomes and Evidence Based Practice Committee

OBJECTIVE

Long-Segment Hirschsprung Disease (LSHD) differs clinically from short-segment disease. This review article critically appraises current literature on the definition, management, outcomes, and novel therapies for patients with LSHD.

METHODS

Four questions regarding the definition, management, and outcomes of patients with LSHD were generated. English-language articles published between 1990 and 2018 were compiled by searching PubMed, Scopus, Cochrane Central Register of Controlled Trials, Web of Science, and Google Scholar. A qualitative synthesis was performed.

RESULTS

66 manuscripts were included in this systematic review. Standardized nomenclature and preoperative evaluation for LSHD are recommended. Insufficient evidence exists to recommend a single method for the surgical repair of LSHD. Patients with LSHD may have increased long-term gastrointestinal symptoms, including Hirschsprung-associated enterocolitis (HAEC), but have a quality of life similar to matched controls. There are few surgical technical innovations focused on this disorder.

CONCLUSIONS

A standardized definition of LSHD is recommended that emphasizes the precise anatomic location of aganglionosis. Prospective studies comparing operative options and long-term outcomes are needed. Translational approaches, such as stem cell therapy, may be promising in the future for the treatment of long-segment Hirschsprung disease.

Impact of Botulinum Toxin on Hirschsprung-Associated Enterocolitis After Primary Pull-Through

BACKGROUND

Hirschsprung-associated enterocolitis (HAEC) is a serious potential complication after primary pull-through surgery for Hirschsprung's disease (HSCR). Administration of anal botulinum toxin (BT) injection may improve obstructive symptoms at the internal anal sphincter, leading to improved fecal passage. The timing of administration and effects on delay or prevention of HAEC are unknown. We hypothesized that BT administration increased the postoperative time to HAEC and aimed to investigate whether anal BT administration after primary pull-through surgery for HSCR is associated with increased time to inpatient HAEC admission development.

METHODS

We performed a retrospective cohort study examining children with HSCR at US children's hospitals from 2008 to 2018 using the Pediatric Health Information System database with an associated primary pull-through operation performed before 60 d of age. The intervention assessed was the administration of BT concerning the timing of primary pull-through, and two groups were identified: PRO (received BT at or after primary pull-through, before HAEC) and NOT (never received BT, or received BT after HAEC). The primary outcome was time from pull-through to the first HAEC admission. The Cox proportional hazards model was developed to examine the BT administration effect on the primary outcome after controlling for patient-level covariates.

RESULTS

We examined a total of 1439 children (67 in the PRO and 1372 in the NOT groups). A total of 308 (21.4%) developed at least one episode of HAEC, including 76 (5.3%) who had two or more episodes. Between 2008 and 2018, the frequency of BT administration has increased from three to 20 hospitals with a frequency of administration between 2.2% and 16.2%. Prophylactic BT (PRO) was not associated with increased time to HAEC event on adjusted analysis.

CONCLUSIONS

Among children with HSCR undergoing primary pull-through surgery, prophylactic BT administration did not demonstrate increased time to first HAEC event. A better-powered study with prophylactic BT is required to determine the effect on HAEC occurrence and timing.

LEVEL OF EVIDENCE

Level II (retrospective cohort study).

Application of WeChat-assisted peri-operative care in children with congenital megacolon

AIM

This study explored the clinical effects of WeChat-based peri-operative care on parents of children with congenital megacolon.

METHODS

Participants were randomly divided into WeChat group and telephone group. This study explored parents' knowledge of the care of children with megacolon, the follow-up rate of children, post-operative defaecation function and complications.

RESULTS

WeChat group scored better in nursing knowledge than telephone group, and the difference was statistically significant. The lost follow-up rate in WeChat group was lower than that in telephone group, and the difference was statistically significant. Post-operative defaecation was also better in the WeChat group than in the phone group. Most complications in the phone group were significantly higher than those in the WeChat group.

CONCLUSION

Peri-operative care for parents of children with megacolon through WeChat can effectively enhance the level of parental care knowledge, improve defaecation, reduce the occurrence of certain complications and reduce lost follow-up.

Modified Duhamel's Two-Staged Procedure for Hirschsprung's Disease: Further Modifications for Improved Outcomes

Aims and Objectives

We studied the short- and long-term outcomes and quality of life (QOL) in patients undergoing a two-staged modified Duhamel's procedure for Hirschsprung's disease.

Materials and Methods

Patients who had undergone this modified procedure, with initial Hartmann's procedure based on contrast enema, followed by bowel preparation and low colo-anal anastomosis below the dentate line were included. The patient who underwent this procedure over 10 years with a minimum 2-year follow-up were analysed based on an interview-based questionnaire.

Results

Of the 152 patients, 69 responded. Mean age at the time of interview was 7.72 ± 3.04 years with mean follow-up of 4.9 years (2-11 years). Perineal excoriation and soiling was present in 60.9% and 36.2% of patients initially which reduced to 0 and 4.3% by the end of 2 years. In the first 6 months, postoperative period, 15.9% of patients had constipation and 78.2% had altered stool consistency. Good fecal continence score was present in 97.1% of patients in the long term. About 95.4% had good QOL scores. There was no mortality in this series.

Conclusions

Although short-term outcomes showed altered bowel function, soiling, and perineal excoriation, this improved significantly in the long term, with good QOL scores in the majority.

Recurrent rectourethral fistula repair: A novel technique of gracilis muscle interposition

BACKGROUND

A perineal approach with gracilis muscle interposition (GMI) remains the most common in recurrent rectourethral fistulas (RUFs). The closure failures in10%-20% cases and urinary incontinence in 10%-80% cases referred to the disadvantages of the perineal approach owing to neurovascular damage. This article shows that the retraction of a survived muscle gracilis flap is one of the causes of fistula recurrence, and a simpler technique of the flap interposition is presented, requiring a less invasive perineal access.

METHODS

Three consecutive patients with RUF at the age of 5, 13 and 15 years who underwent multiple (3, 4 and 5) unsuccessful reconstructive attempts were referred to our clinic. The last procedure was performed with GMI. In all cases, these were acquired iatrogenic fistulas that occurred after operations for Hirschsprung's disease (2) or anorectal malformation (1), and subsequent dilatation of the anus. All patients had a colostomy several years ago. Reinterposition and distant anchoring of the survived graсilis flap were performed through the perineal approach, avoiding lateral and anterolateral dissection.

RESULTS

The early postoperative period was uneventful. In one patient, a stricture of the posterior urethra formed. Urethrotomy was performed in 3 months, with complete restoration of micturition. The colostomy was closed in all patients after 3-4 months. In the long term follow up within 4-8 years, no fistula recurrence was noted.

CONCLUSIONS

The suggested traction technique of GMI allowed: to minimize the perineal access size, hence minimizing the injury and the operating time; to place the anchoring suture outside of the inflammation zone, ensuring secure attachment; to provide precise flap positioning and intimate contact between the flap and the urethra.

LEVEL OF EVIDENCE

Level V.

Hirschsprung-associated enterocolitis in children treated at US children's hospitals

BACKGROUND

The incidence of and risk factors for Hirschsprung's-associated enterocolitis (HAEC) following pull-through have been limited to single institutions studies. We characterized the incidence of, risk factors for, and consequences of post-operative HAEC.

METHODS

We identified children with Hirschsprung's Disease (HD) at US Children's Hospitals from 2007 to 2017 with and an associated pull-through operation at less than 1 year of age. HAEC readmissions were identified using ICD9/10 Diagnosis Codes and antibiotic administration. Hierarchical logistic regression models were developed for the risk factors for HAEC after pull-through and effects of recurrent HAEC on HD-related reoperations.

RESULTS

We identified 2030 children with HD, and 138 (7%) who had two or more readmissions related to HAEC. The frequency of recurrent HAEC by hospital ranged from 0 to 33%. Pre-operative HAEC, history of central nervous system infection, and congenital neurologic anomalies were associated with increased risk of recurrent HAEC. Recurrent HAEC was associated with HD-specific re-operation (OR 5.2, CI 3.3-8.1, p < 0.001); however, it was not associated with risk of in-hospital mortality (OR 3.3, CI 0.88-12.1, p = 0.08).

CONCLUSIONS

HAEC following pull-through occurs in a large proportion of infants with HD and predicts reoperation. Multicenter studies are needed to develop prediction models and treatment protocols for HAEC.

LEVEL OF EVIDENCE

II TYPE OF STUDY: Retrospective cohort study.

Burden and Outcomes of Neonatal Surgery in Uganda: Results of a Five-Year Prospective Study

BACKGROUND

Ninety-four percent of congenital anomalies occur in low- and middle-income countries. In Uganda, only three pediatric surgeons and three pediatric anesthesiologists serve more than 20 million children. This study estimates burden, outcomes, coverage, and economic benefit of neonatal surgical conditions in Uganda.

METHODS

A prospectively collected database was reviewed for neonatal surgical admissions from January 1, 2012, to December 31, 2017, at the only two sites with specialist pediatric surgical coverage. Outcomes were compared with high-income countries. Met and unmet need were estimated using disability-adjusted life years. Economic benefit was estimated using a value of statistical life-year approach.

RESULTS

For 1313 neonatal admissions, the median age of presentation was 3 d, overall mortality was 36%, and median distance traveled was 40 km. Anorectal malformations were most common (18%). Postoperative mortality was 24%. Mortality was significantly associated with surgical intervention (P < 0.0001). Met need was 4181 disability-adjusted life years per year, which corresponds to a $3.5 million net economic benefit to Uganda, with a potential additional benefit of $153 million if unmet need were fully addressed. Approximately 2% of the total need is met by the health care system.

CONCLUSIONS

Neonatal surgery is associated with improved survival for most conditions. Despite increases in workforce and infrastructure, a limited proportion of the need for neonatal surgery is currently being met. This is multifactorial, including lack of access to surgical care and severe shortages of workforce and infrastructure. Current and potential economic benefit to Uganda appears substantial.

Down Syndrome and Postoperative Complications in Children Undergoing Intestinal Operations

OBJECTIVE

This paper intends to evaluate the association between Down Syndrome (DS) and postoperative medical and surgical complications and inpatient postoperative mortality in pediatric patients undergoing intestinal operations.

METHODS

The 2012 Kids' Inpatient Database was queried to compare short-term postoperative medical and surgical complications and in-patient mortality among patients with DS undergoing intestinal operations to a cohort without DS using inverse probability weighting. Subset analysis was performed for patients undergoing intestinal operations exclusive of gastrostomy placement. Adverse treatment effects were calculated for the outcomes of interest.

RESULTS

Of 17,026 pediatric patients undergoing intestinal operations, 444 had DS. In unadjusted analysis, medical complications (urinary tract infection, deep venous thrombosis, sepsis, pneumonia) occurred in 7.9% of patients with DS, compared to 14.1% of those without (p < 0.001). Surgical complications (wound disruption, hemorrhage, superficial or deep wound infection) occurred in 3.5% of patients with DS, compared to 4.6% of those without (p = 0.34), and in-patient mortality occurred in 0.3% of patients with DS, compared to 2.7% of those without (p = 0.009). Adverse treatment effects (ATE) calculated after inverse probability weighting demonstrated no difference for medical or surgical complications but a significantly decreased mortality with DS.

CONCLUSIONS

Contrary to common perception and data extrapolated from the adult literature, pediatric patients with DS have neither higher medical nor surgical complication rates after intestinal operations. Similar to patients undergoing congenital heart surgery, pediatric patients with DS have a lower postoperative inpatient mortality after these general operations compared to those without DS. Mechanisms influencing risks in DS patient remain unknown.

LEVEL OF EVIDENCE

Level III, retrospective comparative study.

Transanal endorectal stepwise gradient muscular cuff cutting pull-through method: Technique refinements and comparison with laparoscopy-assisted procedures

In all existing radical resection procedures available for Hirschprung's disease (HD), the muscular cuff has been retained. In recent years, our study group has modified the procedure using a stepwise gradient muscular cuff cutting pull-through method for the treatment of HD. The objective of the present study was to assess patient prognosis following the use of the transanal endorectal pull-through (TEPT) method or the laparoscopy-assisted pull-through (LPT) method and to provide evidence to assist in clinical decisions. The medical records of 172 patients (age, ≥3 years) who underwent TEPT or LPT for HD between September 2003 and August 2014 at the Pediatric Surgery Department of The Affiliated Hospital of Zunyi Medical College (Zunyi, China) were reviewed (TEPT, n=94; LPT, n=78). Preoperative, intraoperative and post-operative data for the subjects involved were recorded. Each patient's family was interviewed using a uniform 12-item post-pull-through long-term outcome questionnaire, which was scored in order to compare the short and long-term treatment outcomes of patients in each group. Patients in the LPT group had significantly prolonged operating times, reduced intraoperative blood loss and perioperative transfusion rates and shorter anal dissection times. Furthermore, the oral feeding time and length of hospital stay were similar between groups. There were no significant differences in early complications between the groups. No significant differences in late complications, including anastomotic stricture and enterocolitis were observed; however, the soiling and constipation rates were significantly higher in the TEPT group compared with the LPT group. The stool pattern score was not significantly different between groups, while the frequency of bowel movements in the LPT group was significantly higher compared with the TEPT group from 9-24 months post-surgery. The stepwise gradient muscular cuff cutting pull-through method demonstrated a good safety profile and efficacy with regard to the long-term outcomes of patients with HD. These results support the clinical application of LPT as a promising surgical approach for children with HD.

Hirschsprung disease - integrating basic science and clinical medicine to improve outcomes

Hirschsprung disease is defined by the absence of enteric neurons at the end of the bowel. The enteric nervous system (ENS) is the intrinsic nervous system of the bowel and regulates most aspects of bowel function. When the ENS is missing, there are no neurally mediated propulsive motility patterns, and the bowel remains contracted, causing functional obstruction. Symptoms of Hirschsprung disease include constipation, vomiting, abdominal distension and growth failure. Untreated disease usually causes death in childhood because bloodstream bacterial infections occur in the context of bowel inflammation (enterocolitis) or bowel perforation. Current treatment is surgical resection of the bowel to remove or bypass regions where the ENS is missing, but many children have problems after surgery. Although the anatomy of Hirschsprung disease is simple, many clinical features remain enigmatic, and diagnosis and management remain challenging. For example, the age of presentation and the type of symptoms that occur vary dramatically among patients, even though every affected child has missing neurons in the distal bowel at birth. In this Review, basic science discoveries are linked to clinical manifestations of Hirschsprung disease, including partial penetrance, enterocolitis and genetics. Insights into disease mechanisms that might lead to new prevention, diagnostic and treatment strategies are described.

Mortality in Swedish patients with Hirschsprung disease

PURPOSE

Hirschsprung disease (HSCR) has previously been associated with increased mortality. The aim of this study was to assess mortality in patients with Hirschsprung disease in a population-based cohort.

METHODS

This was a nationwide, population-based cohort study. The study exposure was HSCR and the study outcome was death. The cohort included all individuals with HSCR registered in the Swedish National Patient Register between 1964 and 2013 and ten age- and sex-matched controls per patient, randomly selected from the Population Register. Mortality and cause of death were assessed using the Swedish National Causes of Death Register.

RESULTS

The cohort comprised 739 individuals with HSCR (565 male) and 7390 controls (5650 male). Median age of the cohort was 19 years (range 2-49). Twenty-two (3.0%) individuals with HSCR had died at median age 2.5 years (range 0-35) compared to 49 (0.7%) controls at median age 20 years (0-44), p < 0.001. Hazard ratio for death in HSCR patients compared to healthy controls was 4.77 (confidence interval (CI) 95% 2.87-7.91), and when adjusted for Down syndrome, the hazard ratio was 3.6 (CI 95% 2.04-6.37).

CONCLUSIONS

The mortality rate in the HSCR cohort was 3%, which was higher than in controls also when data were adjusted for Down syndrome.

Pathologically assessed grade of Hirschsprung-associated enterocolitis in resected colon in children with Hirschsprung's disease predicts postoperative bowel function

PURPOSE

The aim of this study was to investigate the relationship between the grade of enterocolitis on pathological assessment of resected colon and postoperative bowel function in children with Hirschsprung's disease (HD).

METHODS

Children with HD who were seen at a large tertiary center from January 2012 to December 2013 were enrolled into this study. Resected colon was assessed using the histopathologic grade scoring system for Hirschsprung-associated enterocolitis (HAEC), and the relationship of these scores to postoperative bowel function was assessed. Time of recovery to normal defecation was the primary outcome measure. The t-test, analysis of variance, and Kaplan-Meier, univariate, and multiple regression analyses were performed.

RESULTS

Eighty children with HD (median age at repair 7.9months; range 1.3months to 9years) were included in the study. Nineteen children dropped out of the study and were considered as providing censored data, giving a follow-up rate of 76.3%. A total of 21 children (34.4%) were admitted to hospital with at least one episode of enterocolitis. Multivariate Cox proportional hazards models showed that compared with patients with a normal proximal colon, those with an inflamed proximal segment had a 1.5-fold higher risk of a poor recovery. Logistic regression analyses suggested that postoperative HAEC admissions increased by 57% with each HAEC pathological grade of the transitional segment and by 50% with each grade of the overall segment. Compared with normal bowel in the transitional segment, the detection of grade ≥3 HAEC in the transitional area increased the incidence of postoperative HAEC by 4.75-fold.

CONCLUSIONS

Children whose resected proximal colon showed inflammation on pathological assessment were at risk of poor recovery after surgery. A higher pathological HAEC score for the sum of the overall three segments suggested an increased risk for the subsequent development of enterocolitis. Among three segments, the severity of enterocolitis in the transitional segment was the most significant factor in predicting postoperative HAEC.

TYPE OF STUDY

Clinical study.

LEVEL OF EVIDENCE

Moderate.

Hirschsprung disease-Bowel function beyond childhood

Hirschsprung disease is a developmental defect of the enteric nervous system characterized by lack of enteric neurons in the distal hindgut. There are numerous reports on short-term outcomes indicating that impaired bowel function is common. Recently, several controlled studies show that bowel function outcomes are affected beyond childhood, in adolescents and adults, compared with healthy control subjects. Constipation and fecal incontinence are common. The impaired bowel function appears to have a negative impact on quality of life, although, a majority of patients have adapted to their symptoms. On the other hand, Hirschsprung disease seems to have limited impact on education and occupation in adult life. The aim of this review was to summarize current knowledge of bowel function outcome beyond childhood in patients with Hirschsprung disease.

A Nordic multicenter survey of long-term bowel function after transanal endorectal pull-through in 200 patients with rectosigmoid Hirschsprung disease

OBJECTIVE

Transanal endorectal pull-through (ERPT) is the most popular technique to treat Hirschsprung disease (HD). Still, there is limited knowledge on long-term bowel function. This cross-sectional, multicenter study assessed long-term bowel function in a large HD population and examined predictors of poor outcome.

METHODS

Patients older than four years or their parents filled out a validated questionnaire on bowel function. Clinical details were recorded retrospectively from medical records.

RESULTS

73/200 (37%) patients reported absolutely no impaired bowel function, meaning no constipation, fecal accidents, stoma, appendicostomy or need for enemas. Seven (4%) had a stoma, and 33 (17%) used antegrade or rectal colonic enemas. Most disarrangements of fecal control and constipation were significantly less common in older age group, but abnormal defecation frequency and social problems remained unchanged. Syndromic patients (n=31) experienced frequent fecal accidents (46%) more often than nonsyndromic (14%, P<0.001). Having a syndrome (adjusted OR 5.6, 95% CI 2.1-15, P=0.001) or a complete transanal ERPT (adjusted OR 2.4, 95% CI 1.1-5.7, P=0.038) was significantly associated with poor outcome defined as having a stoma, an appendicostomy, daily fecal accidents or need of regular rectal wash outs.

CONCLUSION

A significant number of HD patients experience bowel problems many years after definite surgery. Fecal control was significantly better in older than younger HD patients, but some continued to have considerable bowel problems also as adults. A total transanal ERPT was associated with poorer outcome. Long-term follow-up of HD patients is warranted. Prognosis Study: Level II.

Patient-reported Swedish nationwide outcomes of children and adolescents with total colonic aganglionosis

BACKGROUND

The aim of this study was to evaluate the nationwide outcome of children with total colonic aganglionosis (TCA) during the last 20years.

METHODS

This was an observational, cross-sectional study where all patients with TCA, including aganglionosis of 0-50cm of ileum, born in Sweden 1995-2014 were included. Data were collected from the medical records. Patients >4years old without stoma answered a questionnaire regarding bowel function (bowel function score, BFS, score 1-20), medical treatment and nutrition.

RESULTS

Twenty-seven children were included. Twenty-five children were reconstructed at median age of 56 (4-236) weeks. Reconstruction procedures included Swenson (6), Soave (5), mucosectomy with short muscular cuff with or without J-pouch (9), Duhamel (3) and Rehbein (2). There was no mortality. The median follow-up time was 9.5years (8months-20years). At follow-up 7 (26%) patients had an ileostomy, 4 with a syndrome. Eight patients required parenteral support, until a median age of 11 (2-24) months. Oral energy support was used by 5/27 (15%), still 5/22 (23%) were underweighted. Obstructive symptoms were reported by 7/20 (31%). All 17 patients >4years old completed the BFS questionnaire at median age of 10 (4-20) years. Median stool frequency/24h was 5 (1-30). Fecal accidents at least once per week was reported by 4 (24%), and social problems by 8 (47%). The median BFS was 15 (11-19) without any gender differences.

CONCLUSION

One-third of patients with TCA report obstructive symptoms, one-third need additional nutrition and one-fifth require a permanent stoma. TCA have a negative impact on social life. Subsequently, children with TCA need a careful lifelong follow-up of specialized teams.

Lower urinary tract symptoms and sexual functions after endorectal pull-through for Hirschsprung disease: controlled long-term outcomes

BACKGROUND/PURPOSE

To define the prevalence of lower urinary tract symptoms (LUTS) and outcomes for sexual function after endorectal pull-through (EPT) for Hirschsprung disease (HD) compared to controls. To date, similar controlled studies are lacking.

METHODS

Patients aged ≥4years (n=123) operated on for HD at our center between 1987 and 2011 were invited to answer questionnaires on LUTS and sexual function (aged ≥16years). Patients with an intellectual disability and patients with a definitive endostomy were excluded. Patients were matched to three controls and also invited to a clinical follow-up for urological investigations including urine flow measurement, renal tract ultrasound, and urinalysis.

RESULTS

Altogether, 59 responses concerning LUTS and 24 responses concerning sexual functions were analyzed. No significant differences were demonstrated in the overall prevalence of LUTS between patients (67%) and controls (80%), nor in the prevalence of frequent LUTS (14% vs. 16%; P=NS for both). One patient (2%) had a urethral stricture after laparotomy-assisted EPT. Male patients reported sexual satisfaction and erectile function similar to controls (P>0.10). Female patients were currently less in stable relationships compared to controls (25% vs. 83%, P=0.005).

CONCLUSIONS

Our results support the safety of EPT in patients with HD with regard to preservation of the integrity and functioning of the genitourinary tract.

Are there any factors influencing the course of multistage treatment in Hirschsprung's disease?

INTRODUCTION

Surgical treatment of Hirschsprung's disease may be performed in a single step, or in stages with a temporary stoma. The therapy depends on the clinical condition of the patient and the severity of symptoms. Planned multistage treatment is carried out in two or three steps.

AIM

To analyse our 15 years of experience with multistage surgery for the treatment of Hirschsprung's disease, to identify multistage-related factors influencing the course of surgery and hospitalisation, and to evaluate the probability of complications during multistage treatment.

MATERIAL AND METHODS

The study material was collected on the basis of documentation of patients treated during the years 2000 to 2014. The parameters concerning surgery and hospitalisation were statistically analysed.

RESULTS

Twenty nine patients were treated with multistage surgery using the following methods: Duhamel-Martin and Transanal Endorectal Pull-Through (TEPT). There were significant correlations (p < 0.05) between length of resected intestine and operative time. Classification and Regression Tree (CRT) was used to classify the operated children depending on the presentence of complications after surgery.

CONCLUSIONS

The incidence of complications during multistage treatment for both methods was comparable. It is difficult to objectively compare the Duhamel-Martin and TEPT techniques because of the different indicators for their use in multistage surgery. Intestinal adhesions were the most common complication after definitive surgery. Younger age of the operated patients was associated with greater risk of adhesion formation.

Established and Emerging Concepts in Hirschsprung’s-Associated Enterocolitis

Hirschsprung's disease (HSCR) is a common cause of neonatal bowel obstruction and the approach to diagnosis and surgical treatment is well defined and accepted. Hirschsprung's-associated enterocolitis (HAEC) remains a frequent cause of pre-operative and post-operative morbidity and mortality, with unchanged treatment guidelines over multiple decades. Recent advances in our understanding of the genetics underlying HSCR have allowed the development of animal models, some of which recapitulate the HAEC phenotype. These animal models, along with recent translational studies, have implicated multiple facets of mucosal immunity and microbiome dysbiosis in the development of HAEC. Here, we will review the established epidemiology, modes of diagnosis and treatment of HAEC. Furthermore, we will explore emerging concepts in the pathogenesis of this disease; including animal models, alterations in mucosal immunity, dysbiosis of the intestinal microbiome, specific genetic susceptibility, and novel treatment modalities.

Ibuprofen slows migration and inhibits bowel colonization by enteric nervous system precursors in zebrafish, chick and mouse

Hirschsprung Disease (HSCR) is a potentially deadly birth defect characterized by the absence of the enteric nervous system (ENS) in distal bowel. Although HSCR has clear genetic causes, no HSCR-associated mutation is 100% penetrant, suggesting gene-gene and gene-environment interactions determine HSCR occurrence. To test the hypothesis that certain medicines might alter HSCR risk we treated zebrafish with medications commonly used during early human pregnancy and discovered that ibuprofen caused HSCR-like absence of enteric neurons in distal bowel. Using fetal CF-1 mouse gut slice cultures, we found that ibuprofen treated enteric neural crest-derived cells (ENCDC) had reduced migration, fewer lamellipodia and lower levels of active RAC1/CDC42. Additionally, inhibiting ROCK, a RHOA effector and known RAC1 antagonist, reversed ibuprofen effects on migrating mouse ENCDC in culture. Ibuprofen also inhibited colonization of Ret+/- mouse bowel by ENCDC in vivo and dramatically reduced bowel colonization by chick ENCDC in culture. Interestingly, ibuprofen did not affect ENCDC migration until after at least three hours of exposure. Furthermore, mice deficient in Ptgs1 (COX 1) and Ptgs2 (COX 2) had normal bowel colonization by ENCDC and normal ENCDC migration in vitro suggesting COX-independent effects. Consistent with selective and strain specific effects on ENCDC, ibuprofen did not affect migration of gut mesenchymal cells, NIH3T3, or WT C57BL/6 ENCDC, and did not affect dorsal root ganglion cell precursor migration in zebrafish. Thus, ibuprofen inhibits ENCDC migration in vitro and bowel colonization by ENCDC in vivo in zebrafish, mouse and chick, but there are cell type and strain specific responses. These data raise concern that ibuprofen may increase Hirschsprung disease risk in some genetically susceptible children.

Histological Spectrum of Large Intestinal Lesions with Clinicopathological Correlation

INTRODUCTION

Large intestine is affected by various types of lesions, both non-neoplastic and neoplastic. Due to vague symptoms, the clinical diagnosis is usually delayed. A battery of laboratory tests including biopsy is essential to arrive at a specific diagnosis for appropriate management.

MATERIALS AND METHODS

This five years study was done during the period of 2005 to 2010 in a tertiary care centre which included 124 biopsies and resected specimens of large intestine and 64 from Anal canal. All tissues were fixed in formalin, stained with H&E and special stains like Periodic Acid Schiff (PAS), Reticulin, Zeihl Neelsen (ZN) along with Immunohistochemistry (IHC) were done as and when required.

RESULTS

Out of the 124 cases of large intestine 38 were non-neoplastic, 77 were neoplastic and 9 were inadequate biopsies. Sixty four cases from Anal canal included 55 non-neoplastic and 9 neoplastic lesions. The non-neoplastic conditions included congenital anomalies, infective and ischaemic lesions while neoplastic included benign and malignant lesions. Most of the cases presented with symptoms like abdominal pain, vomiting and constipation.

CONCLUSION

We observed that neoplastic lesions were more common in large intestine while non-neoplastic lesions were frequently seen in Anal canal. Present study emphasizes the need for early histopathological diagnosis for appropriate treatment.

Clinical outcome and bowel function after surgical treatment in Hirschsprung's disease

BACKGROUND

Bowel function has been reported to be adversely affected following surgery in cases of Hirschsprung. We retrospectively studied both the clinical outcome and bowel function status following surgery in patients diagnosed with Hirschprung's disease (HD). 161 cases, who underwent pull-through operations for HD in Sheikh Pediatric Tertiary Centre, Mashhad, Iran. The specified time bracket spanned between 2006 and 2011.

MATERIALS AND METHODS

Data was extracted from Health Information System with the aim of investigating patients for both short and long-term gastrointestinal (GI) complications after surgery bases in addition to the concurrence of any associated anomalies. Three main procedures were analysed in this respect (Swenson, Duhamel and Soave).

RESULTS

In a study of 96 (59%) boys and 65 (40.3%) girls, mortality rate was reported to be 15.5% (15 males and 10 females). A considerable majority of almost three fourths were detected with both early and late GI complications after surgery. The latter mainly included constipation (30.8%), incontinence (19.8%), enterocolitis (8%), diarrhea (11%) in a declining order of incidence. Down syndrome and others HD-associated anomalies were detected in 3.7% and 24.3% of cases respectively.

CONCLUSIONS

Constipation and foecal incontinence were the most prevalent postoperative complications, which were reported almost as frequent in other studies. Yet, Enterocolitis, was reported slightly less in prevalence. Also mortality rates were considerably higher, compared to developed nations.

Outcomes and unmet need for neonatal surgery in a resource-limited environment: estimates of global health disparities from Kampala, Uganda

PURPOSE

Reported outcomes of neonatal surgery in low-income countries (LICs) are poor. We examined epidemiology, outcomes, and met and unmet need of neonatal surgical diseases in Uganda.

METHODS

Pediatric general surgical admissions and consults from January 1, 2012, to December 31, 2012, at a national referral center in Uganda were analyzed using a prospective database. Outcomes were compared with high-income countries (HICs), and met and unmet need was estimated using burden of disease metrics (disability-adjusted life years or DALYs).

RESULTS

23% (167/724) of patients were neonates, and 68% of these survived. Median age of presentation was 5days, and 53% underwent surgery. 88% survived postoperatively, while 55% died without surgery (p<0.001). Gastroschisis carried the highest mortality (100%) and the greatest mortality disparity with HICs. An estimated 5072 DALYs were averted by neonatal surgery in Uganda (met need), with 140,154 potentially avertable (unmet need). Approximately 3.5% of the need for neonatal surgery is met by the health system.

CONCLUSIONS

More than two thirds of surgical neonates survived despite late presentation and lack of critical care. Epidemiology and outcomes differ greatly with HICs. A high burden of hidden mortality exists, and only a negligible fraction of the population need for neonatal surgery is met by health services.

Prevalence of Hirschsprung's disease in premature infants: a systematic review

PURPOSE

Intestinal dysmotility in preterm infants has often been attributed to immature enteric nervous system. It is frequently reported that Hirschsprung's disease (HD) is rare in premature infants. The exact prevalence of HD in premature infants is not well documented. The classical signs of HD may often not be identified due to the complexity of symptoms of prematurity itself. This systematic review was designed to determine the prevalence and presentation of HD in premature infants.

METHODS

A systematic review of the literature using the keywords "Hirschsprung's disease", "aganglionosis", "congenital megacolon", "premature" and "preterm" was performed. Resulting publications were reviewed for epidemiology and morbidity. Only infants born <37 weeks of gestation or described as preterm birth by the authors were included. Reference lists were screened for additional relevant studies.

RESULTS

Twenty-six publications from 1964 to 2013 reported data on premature infants with HD. Out of a total number of 4,147 infants, prematurity was recorded in 257 cases, giving a prevalence rate of 6 % of preterm infants diagnosed with HD. During 1964-1999, reported prevalence of HD in premature infants ranged from 1.7 to 9.2 % (overall prevalence 5 %) and during 2000-2013 prevalence ranged from 4 to 19.4 % (overall prevalence 14 %). The prevalence of total colonic aganglionosis in premature infants was 13 % (15 out of 118 infants). Mean gestational age of preterm infants was 34.5 (± 0.7) weeks and mean age at diagnosis ranged from 18.3 days to 3.9 months. Abdominal distension was observed in 80 % of preterm infants, delayed passage of meconium in 57 and 37 % of premature infants presented with bile-stained vomiting.

CONCLUSION

In recent years, higher prevalence of HD has been reported in premature infants compared to previous years. Hirschsprung's disease should be considered in preterm infants presenting with features of intestinal obstruction.

Transanal, full-thickness, Swenson-like approach for Hirschsprung disease

PURPOSE

Swenson's procedure for Hirschsprung disease (HD) was thought to disturb fecal, urinary, and ejaculatory functions leading to other approaches including the Soave and Duhamel techniques. Given our Center's experience with a full-thickness rectal dissection for anorectal malformations, and using the new transanal concept, we chose to apply these ideas to the primary treatment of HD, and describe technical aspects and impact on fecal, urinary, and sexual function.

METHODS

We reviewed our series of HD patients who underwent a transanal, Swenson-like rectosigmoid dissection, assessing for postoperative stricture, anastomotic leak, enterocolitis, and long-term results for bowel, urinary, and sexual function.

RESULTS

Of 67 patients, 28 had a transanal resection, 5 had transanal plus laparoscopy, and 34 had transanal plus laparotomy, of those, 28 patients had a leveling colostomy prior to referral. The average length of resection was 27 cm ± 12.7 cm. Mean follow-up was 17.2 months (range 1-96 months). 44 patients were at least three years old at follow-up and were assessed for urinary and fecal continence; all (100%) had voluntary bowel movements and urinary continence. Enterocolitis occurred in 9 patients (14%) and constipation (requiring laxatives) occurred in 21 (32%). Of 24 male patients, 21 (88%) reported the occurrence of spontaneous erections post-operatively.

CONCLUSION

Our data support the fact that a modification of Swenson's original transabdominal dissection concept using the recently described transanal approach is an excellent technique for Hirschsprung, and produces excellent long-term outcomes for fecal and urinary continence, and seems to preserve erectile function.

Hirschsprung's disease associated with Down syndrome: a meta-analysis of incidence, functional outcomes and mortality

PURPOSE

Down syndrome (DS) is the most frequent chromosomal abnormality associated with Hirschsprung's disease (HD). It has often been suggested that this association results in poorer outcomes with regard to postoperative complications, continence and mortality. On the other hand, the results after surgical treatment of HD in patients with DS are reportedly similar to those in cases with HD alone. The objective of this study was to determine the incidence of DS in cohorts with HD, and to compare pre-/postoperative complications, functional outcome and mortality between cohorts with and without coexisting DS.

METHODS

A systematic literature-based search for relevant cohorts was conducted using multiple online databases. The number of DS cases in HD cohorts was recorded and data on pre-/postoperative complications, functional outcome and mortality were extracted. Pooled odds ratios with 95% confidence intervals were calculated using meta-analysis methodology.

RESULTS

Sixty-one articles met defined inclusion criteria, comprising data from 16,497 patients with HD. The overall incidence of DS among them was 7.32%. Vice versa, the incidence of HD in 29,418 patients with DS was 2.62%. There were no significant differences regarding the male-to-female ratio between cohorts with and without coexisting DS (4:1 vs. 3:1 respectively; P = 0.5376). The rate of additional comorbidities was significantly higher in HD associated with DS (P < 0.0001). Recto-sigmoid HD was in both cohorts the most common type of HD (P = 0.8231). Long-segment HD was significantly more frequent in HD with coexisting DS (P = 0.0267), while total colonic aganglionosis occurred significantly more often in HD without DS (P = 0.0003). There were no significant differences in preoperative constipation/obstruction (P = 0.5967), but the rate of preoperative enterocolitis was significantly higher in HD associated with DS (P = 0.0486). Postoperative complications such as recurrent enterocolitis (P = 0.0112) and soiling (P = 0.0002) were significantly more frequent in HD with coexisting DS. Although not statistically significant, fecal incontinence (P = 0.1014) and persistent constipation (P = 0.1670) occurred more often after surgical treatment of HD with DS. The mortality rate was significantly higher in HD associated with DS (P < 0.0001).

CONCLUSIONS

The association of HD with DS is well-recognized with an incidence of 7.32%. A large number of patients with DS continue to have persistent bowel dysfunction after surgical treatment of HD. Our data provide strong evidence that the coexistence of HD and DS is associated with higher rates of pre-/postoperative enterocolitis, poorer functional outcomes and increased mortality.

Hirschsprung-associated enterocolitis: pathogenesis, treatment and prevention

Hirschsprung-associated enterocolitis (HAEC) is a common and sometimes life-threatening complication of Hirschsprung disease (HD). Presenting either before or after definitive surgery for HD, HAEC may manifest clinically as abdominal distension and explosive diarrhea, along with emesis, fever, lethargy, and even shock. The pathogenesis of HAEC, the subject of ongoing research, likely involves a complex interplay between a dysfunctional enteric nervous system, abnormal mucin production, insufficient immunoglobulin secretion, and unbalanced intestinal microflora. Early recognition of HAEC and preventative practices, such as rectal washouts following a pull-through, can lead to improved outcomes. Treatment strategies for acute HAEC include timely resuscitation, colonic decompression, and antibiotics. Recurrent or persistent HAEC requires evaluation for mechanical obstruction or residual aganglionosis, and may require surgical treatment with posterior myotomy/myectomy or redo pull-through. This chapter describes the incidence, pathogenesis, treatment, and preventative strategies in management of HAEC.

The pathogenesis of Hirschsprung's disease-associated enterocolitis

Hirschsprung's disease-associated enterocolitis (HAEC) remains the most life-threatening complication in Hirschsprung disease (HD) patients. The pathogenesis of HAEC has not been determined and many hypotheses regarding the etiology of HAEC have been proposed. These include a possible causal relationship between the abnormal enteric nervous system development in HD and the development of enterocolitis. Based on the complex genetic causes of HD that have been discovered and the resultant heterogeneous group of patients that exists, the causes of HAEC are likely multiple. New insights regarding the relationship of the role of the enteric nervous system and its interaction between intestinal barrier function, innate host immunity, and commensal microflora have been discovered, which may shed light on this perplexing problem. This review presents current known risk factors of HAEC and the proposed theories and supporting evidence for the potential etiologies of HAEC.

The Hirschsprungs patient who is soiling after what was considered a "successful" pull-through

After surgery for Hirschsprungs disease, most children thrive, have few if any episodes of abdominal distention and enterocolitis, and are fecally continent. However, there exists a small group of patients who do not do well. Either they suffer from persistent distension and enterocolitis or they experience soiling after their pull-through procedure. These patients can be systematically evaluated and successfully treated with a combination of bowel management, dietary changes, and laxatives, and, in certain circumstances, a reoperation.

Long-term outcomes of Hirschsprung's disease

Despite significant developments in the understanding of the pathologic anatomy and physiology of Hirschsprung's disease (HD), the results of surgical therapy remain far from perfect. The functional defects and psychosocial difficulties that occur commonly in children with HD are passed on to adulthood in a significant proportion of patients. Recent prospective and adequately controlled cross-sectional studies reveal that constipation and fecal soiling are common late sequelae in adulthood. HD patients show uniformly lower scores of overall bowel function than healthy control subjects. Functional outcome and quality of life may be interrelated and deteriorate with increasing age. Despite these shortcomings, at adult age, most of the HD patients appear to be able to function as normal members of the society in terms of psychosocial, occupational, and recreational activities. Patients are at risk of developing related conditions, such as cancer, that require planning of specific screening programs. Many of the long-term problems that these patients experience are specific to HD. The follow-up of HD patients should be performed by medical personnel familiar with the disease, preferably in a specialized referral center, and the follow-up should continue beyond childhood.

Mucosal healing in inflammatory bowel diseases: a systematic review

Recent studies have identified mucosal healing on endoscopy as a key prognostic parameter in the management of inflammatory bowel diseases (IBD), thus highlighting the role of endoscopy for monitoring of disease activity in IBD. In fact, mucosal healing has emerged as a key treatment goal in IBD that predicts sustained clinical remission and resection-free survival of patients. The structural basis of mucosal healing is an intact barrier function of the gut epithelium that prevents translocation of commensal bacteria into the mucosa and submucosa with subsequent immune cell activation. Thus, mucosal healing should be considered as an initial event in the suppression of inflammation of deeper layers of the bowel wall, rather than as a sign of complete healing of gut inflammation. In this systematic review, the clinical studies on mucosal healing are summarised and the effects of anti-inflammatory or immunosuppressive drugs such as 5-aminosalicylates, corticosteroids, azathioprine, ciclosporin and anti-TNF antibodies (adalimumab, certolizumab pegol, infliximab) on mucosal healing are discussed. Finally, the implications of mucosal healing for subsequent clinical management in patients with IBD are highlighted.

Total colonic aganglionosis: a systematic review and meta-analysis of long-term clinical outcome

PURPOSE

Total colonic aganglionosis (TCA) is a severe form of Hirschsprung's disease (HD), occurring in less than 10 % of the cases. It is a challenging surgical condition and outcomes of pull-through (PT) surgery are reported to be inferior to those in patients with recto-sigmoid HD. As even large centres only see a few patients with TCA, there is little information on the long-term outcome of patients after PT operation for TCA. The aim of this meta-analysis was to investigate the long-term clinical outcome in patients with TCA.

METHODS

MEDLINE(®) and EMBASE(®) databases were searched for relevant articles that reported the outcomes of patients with TCA published between 1980 and 2011. The search terms were "Hirschsprung's disease", "Total colonic aganglionosis" AND "Outcome". All published studies containing adequate clinical data for a mean follow-up period of not less than 4 years were included. Reference lists of retrieved articles were reviewed for additional cases. Detailed records of morbidity and mortality were extracted and analysed.

RESULTS

This search yielded 225 articles reporting on outcomes in TCA. Of these, 189 were excluded for having too short a follow-up period, small or single case series, inadequate clinical data and duplicated patient groups. Ultimately, 36 articles from 37 centres containing useful clinical information on the outcomes of TCA in 969 patients were identified. There were 152 early deaths prior to PT (15.7 %). Of 817 survivors, 739 underwent PT. The mortality rate for TCA post-PT was 5.7 %. The most frequently reported post-operative complication was enterocolitis in 42 % of the cases. 17.5 % of patients underwent subsequent major surgery including redo PT, stoma reformation or other laparotomy. Long-term follow-up data were available in 396 patients. Satisfactory or normal bowel control was reported in 60 % of the patients. Soiling, faecal incontinence or other poor outcome was reported in 33.5 % of the cases and 6.5 % of the patients had undergone conversion to a permanent ileostomy for post-operative complications.

CONCLUSION

This meta-analysis reveals that a large number of patients with TCA have long-term problems with bowel control.

Outcome of transanal endorectal vs. transabdominal pull-through in patients with Hirschsprung's disease

INTRODUCTION

Various outcomes have been reported in patients with Hirschsprung's disease (HD) following transanal endorectal (TERPT) or conventional transabdominal (ABD) pull-through procedures. This study examined postoperative complications and the long-term outcome of TERPT vs. ABD pull-through for HD.

METHODS

Records were reviewed for 53 patients over 3 years of age in whom a pull-through procedure was performed for HD (TERPT, n = 24; ABD, n = 29) between 1992 and 2007 at the Departments of Pediatric Surgery, University of Heidelberg and University Hospital of Mannheim, and their families were interviewed and scored via a thorough 15-item, post-pull-through, long-term outcome questionnaire. Total scores ranged from 0 to 40: 0 to 10, excellent; 11 to 20, good; 21 to 30, fair; and 31 to 40, poor. Two-sided Fisher's exact test and analysis of variance were used to compare different variables in patients in the two groups with significance set at p < 0.05. Results are expressed as mean and standard deviation (SD).

RESULTS

Overall scores were similar (TERPT, n = 16, 7.3 +/- 6.6 vs. ABD, n = 23, 4.6 +/- 3.5, p = 0.11) and showed mainly excellent or good long-term outcome for TERPT (93.8%) and ABD (99.7%) pull-through procedures. The incidence of incontinence in children older than 3 years was insignificantly lower in ABD group (TERPT 18.7% vs. ABD 4.3 %, p = 0.15). Regarding the soiling score, however, the soiling tended to be significantly more severe after TERPT than ABD. For the TERPT procedure, the appearance of postoperative constipation, enterocolitis, anastomotic dehiscence, and symptomatic anastomotic stricture was lower but this was not statistically significant. After TERPT, patients started to feed sooner (TERPT 2.8 days vs. ABD 4.4 days, p = 0.005) and operating time (TERPT 133.2 min vs. ABD 204 min, p < 0.001) and hospital stay (TERPT 9.8 days vs. ABD 17.7 days, p < 0.001) were significantly shorter.

CONCLUSION

We employ the TERPT procedure as the first choice in children with rectosigmoid HD.

Hirschsprung's disease: what about mortality?

PURPOSE

Although significantly decreased during last decades, mortality rate for Hirschsprung's disease still ranges between 1 and 10%. The authors reviewed the main features of patients with Hirschsprung's disease treated in our Institution who died in the period between 1993 and 2010 in order to detect possible risk factors or prevention strategies.

METHODS

The notes of all patients with Hirschsprung's disease admitted to our Institution between January 1993 and January 2010 were reviewed. All families were interviewed and possible unknown deaths were recorded. We reported demographic data, length of aganglionosis, type and number of associated anomalies, age and type of onset, age and cause of death, chronological relationship between death and pull-through, and all other significant details.

RESULTS

Eight out of a series of 313 patients with Hirschsprung's disease died during the study period (mortality rate = 2.56%). Six patients were male for a male to female ratio of 3:1. Eleven associated anomalies were detected in five patients, including four congenital anomalies of the kidney and urinary tract, four heart, two central nervous system, and one skeletal malformations. One patient had Down Syndrome and one Cat Eye Syndrome. Two patients were born preterm. All patients had neonatal onset with delayed meconium passage. Five patients had aganglionosis confined to rectosigmoid colon (classic forms), two had total colonic aganglionosis and one had total intestinal aganglionosis. Enterostomy was performed in five patients. Median age at death was 75 days (range 30 days-8 years). The cause of death was enterocolitis in four patients, heart failure in three, and intestinal failure in one. Six patients died before the pull-through. Two patients died postoperatively. All patients but two died at home.

CONCLUSIONS

Onset and clinical features do correlate with severity. Newborns and infants seem to be more likely to develop serious life-threatening complications, particularly in case of associated cardiovascular malformations. Although enterostomies do not have protective effects over cardiovascular issues, prophylactic stoma should be considered in high-risk patients. Radical treatment (pull-through) should be performed as soon as possible. Alternatively, protected and cautious discharge of newborns with associated heart anomalies is strongly recommended in order to prevent serious and uncontrolled complications, regardless of the presence of a protective enterostomy. Postoperatively, close follow-up appointments are recommended. Families should be acknowledged and educated for prompt recognition and treatment of severe life-threatening complications.