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Background: Pediatric intestinal pseudo‐obstruction (PIPO) encompasses a variety of rare, heterogeneous, and disabling disorders that severely affect gastrointestinal motility and are associated with high morbidity and mortality. PIPO management is complex and focuses on maintaining an optimal nutritional status, improving gut function, relieving symptoms, and treating complications. Nutritional issues prevail, and PIPO patients often experience severe undernutrition and faltering growth. Thus, nutritional management plays a pivotal role for achieving the most favorable clinical outcomes. The calorie and nutrient intake of each patient needs to be tailored to age, extent and severity of gut involvement and nutritional needs to support an optimal nutritional status. After defining the extent and severity of gut dysmotility, an experienced team should perform a careful nutritional assessment. An oral diet should always be encouraged and might include bite and dissolve solids, liquid diet or simple oral stimulation. If oral caloric intake is inadequate, liquid gastric feeds should provide the subsequent step. In the presence of severe gastric dysmotility, continuous post‐pyloric feeding represents a viable option. In the most severe cases, parenteral nutrition (PN) is required to meet appropriate nutritional requirements. Purpose: Pediatric data on this topic are scarce and mainly extrapolated from adult studies. In this review, we discuss current evidence and knowledge regarding nutritional options, implications of the use of different feed types, including a blended diet, and the use of PN. Moreover, based on our experience and the evidence from the literature, we propose a flow chart to guide the nutritional management of PIPO patients. [ABSTRACT FROM AUTHOR]

Background: IBS affects a large number of children throughout the world and is thought to be the result of disturbed neuroimmune function along with the brain–gut axis. Although the underlying pathophysiologic mechanisms are not clear, the role of low‐grade inflammation and mucosal immune activation in IBS symptom generation has become evident also in subsets of pediatric patients. Animal models provided meaningful insight in the causal relationship between abnormal mucosal immune activation and changes in gastrointestinal (GI) sensory‐motor function. Likewise, the development of long‐standing GI symptoms fulfilling the current criteria for functional GI disorders after infection gastroenteritis and in patients with IBD or celiac disease in remission further supports this hypothesis. Immune activation, its impact on gut sensory‐motor function, and potential implications for symptom generation emerged in both children and adults with IBS. Purpose: The aim of this review is to summarize the main evidence on the presence of low‐grade inflammation and immune activation in children with IBS, its possible role in symptom generation, and its potential implication for new therapeutic strategies. [ABSTRACT FROM AUTHOR]

Background/Objectives: Gastric emptying (GE) requires precise antropyloroduodenal coordination for effective transpyloric flow, the mechanisms of which are still unclear. We aimed to correlate gastric antral function assessed by antroduodenal manometry (ADM) with GE scintigraphy (GES) for liquid feeds in children with suspected gastrointestinal dysmotility. Methods: Children who underwent both ADM and GES over a five‐year period were reviewed. ADM tracings were re‐analyzed to assess antral frequency, amplitude, and motility index (MI) pre‐prandially and postprandially. Transpyloric propagation (TPP) was defined as antegrade propagated antral activity preceding duodenal phase III of the migrating motor complex (MMC). TPP was defined as "poor" if occurring in <50% of all presented duodenal phases III. For GES, regions of interest over the whole stomach, fundus, and antrum were drawn to calculate GE half‐time (GE‐T1/2) and retention rate (RR) in each region at 1 and 2 h. Results: Forty‐seven children (median age: 7.0 years) were included. Twenty‐two had PIPO, 14 functional GI disorders, and 11 gastroparesis. Children with poor TPP had longer GE‐T1/2 (113.0 vs 66.5 min, p = 0.028), higher RR of the whole stomach and fundus at 1 h (79.5% vs 63.5%, p = 0.038; 60.0% vs 41.0%, p = 0.022, respectively) and 2 h (51.0% vs 10.5%, p = 0.005; 36.0% vs 6.5%, p = 0.004, respectively). The pre‐prandial antral amplitude of contractions inversely correlated with GE‐T1/2, RR of the whole stomach, and fundus at 2 h. Conclusions: TPP during phase III of the MMC correlated with gastric emptying of liquid and its assessment on ADM might predict abnormalities in postprandial gastric function. [ABSTRACT FROM AUTHOR]

Background: Antroduodenal manometry (ADM) and histopathology are currently employed to aid the diagnosis of pediatric intestinal pseudo‐obstruction (PIPO). Limited data are available on the reliability of ADM analysis and its correlation with histopathology. We aimed to develop a protocol for enhanced analysis of ADM contractile patterns, including a scoring system, and explore whether this provided better correlation with histopathology. Methods: Children referred with suspected PIPO between April 2012‐December 2019 who underwent both ADM and full‐thickness biopsies were included. ADM tracings were analyzed using both standard (conventional ADM) and novel (enhanced ADM) motility parameters. A novel ADM score (GLASS score) was generated based on the enhanced ADM analysis. Conventional and enhanced ADM analyses were then correlated with histopathology. Results: Forty patients were included. Using conventional clinical criteria, 29 of these were diagnosed with PIPO and the other 11 with non‐PIPO diagnoses. Twenty‐three of the PIPO patients had abnormal histopathology: 6 myopathy, 4 neuropathy, 3 neuro‐myopathy, and 10 non‐specific changes. No agreement in diagnosis was found between conventional ADM analysis and histopathology (ϰ = 0.068; p = 0.197), whereas the latter significantly correlated with enhanced ADM analysis (ϰ = 0.191; p = 0.003). The enhanced ADM score was significantly higher in PIPO versus non‐PIPO (16.0 vs. 8.0; p < 0.001). Conclusions: As opposed to conventional analysis protocols, the newly developed enhanced ADM analysis and associated score is not only able to discriminate between PIPO and non‐PIPO patients, but also between distinct histopathological pathologies. Further studies are required to assess the utility of enhanced ADM analysis in larger populations. [ABSTRACT FROM AUTHOR]

Background: Colonic manometry with intraluminal bisacodyl infusion can be used to assess colonic neuromuscular function in children with treatment‐refractory constipation. If bisacodyl does not induce high‐amplitude propagating contractions (HAPCs), this can be an indication for surgical intervention. A detailed characterization of the colonic response to intraluminal bisacodyl in children with constipation may help to inform clinical interpretation of colonic manometry studies. Methods: Studies were performed in five pediatric hospitals. Analysis included identification of HAPCs, reporting HAPCs characteristics, and an area under the curve (AUC) analysis. Comparisons were performed between hospitals, catheter type, placement techniques, and site of bisacodyl infusion. Results: One hundred and sixty‐five children were included (median age 10, range 1‐17 years; n = 96 girls). One thousand eight hundred and ninety‐three HAPCs were identified in 154 children (12.3 ± 8.8 HAPCs per child, 0.32 ± 0.21 HAPCs per min; amplitude 113.6 ± 31.5 mm Hg; velocity 8.6 ± 3.8 mm/s, propagation length 368 ± 175 mm). The mean time to first HAPC following bisacodyl was 553 ± 669 s. Prior to the first HAPC, there was no change in AUC when comparing pre‐ vs post‐bisacodyl (Z = −0.53, P =.60). The majority of HAPCs terminated in a synchronous pressurization in the rectosigmoid. Defecation was associated with HAPCs (χ2(1)=7.04, P <.01). Site of bisacodyl administration, catheter type, and hospital location did not alter the response. Conclusions and Inferences: Intraluminal bisacodyl induced HAPCs in 93% of children with treatment‐refractory constipation. The bisacodyl response is characterized by ≥1 HAPC within 12 minutes of infusion. The majority of HAPCs terminate in a synchronous pressurization in the rectosigmoid. Optimal clinical management based upon colonic manometry findings is yet to be determined. [ABSTRACT FROM AUTHOR]

Defecatory disorders in children, including chronic constipation (CC) and fecal incontinence (FI), are common conditions worldwide and have a significant impact on children, their families, and the healthcare system. Anorectal manometry (ARM) and high‐resolution anorectal manometry (HRAM) are relatively novel tools for the assessment of anal sphincter function and rectal sensation and have contributed significantly to improving the understanding of the anorectum as a functional unit. ARM has been recognized as the investigation of choice for adults with symptoms of defecation disorders, including fecal incontinence (FI), evacuation difficulties, and constipation. Although it is the gold standard tool in adults, it has yet to be formally accepted as a standardized diagnostic tool in the pediatric age, with limited knowledge regarding indications, protocol, and normal values. ARM/HRAM is slowly becoming recognized among pediatricians, but given that there are currently no agreed guidelines there is a risk that will lead to diversity in practice. The British Society of Paediatric Gastroenterology, Hepatology and Nutrition (BSPGHAN)—Motility Working Group (MWG) therefore has taken the opportunity to provide guidance on the use of ARM/HRAM in children with CC and/or FI. [ABSTRACT FROM AUTHOR]

Background: The colo‐anal reflex is a distinct reflex whereby the internal anal sphincter (IAS) relaxes in association with colonic high amplitude propagating contractions (HAPCs) in contrast to the recto‐anal inhibitory reflex (RAIR), which is characterized by IAS relaxation upon rectal distension. The RAIR is mediated by the myenteric plexus and therefore absent in Hirschsprung disease. We retrospectively assessed the presence and the characteristics of the colo‐anal reflex in children in whom large bowel continuity had been surgically disrupted to assess the role of the extrinsic nervous system in the reflex. Methods: High‐resolution (HR) colonic manometry and HR‐anorectal manometry were used to evaluate both colonic and anal motor activity in ten children with treatment‐unresponsive slow transit constipation (STC), who had previously undergone left‐sided colostomy formation with consequent disruption of the bowel continuity, and in two children with Hirschsprung's disease (HSCR), who had previously undergone distal colon resection followed by Duhamel pull‐through. Eight children with STC, normal colonic motor activity, and preserved large bowel continuity served as a control group. The presence and characteristics of colo‐anal reflex were analyzed. Key Results: In the study group, all patients showed the presence of both normal HAPCs and the presence of the colo‐anal reflex. In two cases of HSCR, RAIR was absent; however, both patients demonstrated a colo‐anal reflex. Conclusions: In children with disrupted continuity of the colon and/or abnormal anal reflex, the colo‐anal reflex is still preserved suggesting that it is mediated by a different pathway from the RAIR, possibly an extrinsic neural pathway. In children with disrupted continuity of the colon and/or abnormal anal reflex due to Hirschsprung disease, the colo‐anal reflex is still preserved suggesting that it is mediated by a different pathway from the recto‐anal inhibitory reflex (RAIR), possibly an extrinsic neural pathway. [ABSTRACT FROM AUTHOR]