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Effect of Caffeine on Colonic Manometry in Children. J Pediatr Gastroenterol Nutr 2023; 76:20-24. [PMID: 36574000 PMCID: PMC9760462 DOI: 10.1097/mpg.0000000000003627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
OBJECTIVES Coffee and caffeinated products have been widely consumed for many centuries. Previous adult studies have suggested that both coffee and decaffeinated beverages induce colonic motility. However, no study has been conducted in pediatrics, and the role of caffeine alone in pediatric colonic motility needs to be explored. METHODS A prospective study of pediatric patients undergoing standard colonic motility testing that were able to consume caffeinated coffee, decaffeinated coffee, and caffeine tablet during colonic manometry. Patients who had a gastrocolonic reflex and high amplitude propagated contractions (HAPCs) in response to intraluminal administration of bisacodyl in the colon were included in the final analyses. RESULTS Thirty-eight patients were recruited, 22 of which were excluded, 11 due to abnormal studies (no HAPC seen in response to intraluminal response to bisacodyl), and 11 due to inability to consume all study agents or complete the study. Sixteen patients met criteria for final analyses. Intracolonic bisacodyl produced a larger area under the curve (AUC) compared to all other agents. Caffeinated coffee resulted in a higher AUC, motility index (MI), and time to HAPC compared with decaffeinated coffee ( P < 0.05). There was no significant difference between caffeinated coffee and caffeine tablet, or caffeine tablet and decaffeinated coffee. CONCLUSIONS Caffeine is indeed a colonic stimulant; however, other components of caffeinated and non-caffeinated beverages likely induce colonic response and require further evaluation for possible use as a colonic stimulant.
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Allen GM, Palermo AE, McNaughton KMD, Boswell-Ruys CL, Lee BB, Butler JE, Gandevia SC, McCaughey EJ. Effectiveness of Abdominal Functional Electrical Stimulation for Improving Bowel Function in People With a Spinal Cord Injury: A Study Protocol for a Double-Blinded Randomized Placebo-Controlled Clinical Trial. Top Spinal Cord Inj Rehabil 2022; 28:22-31. [PMID: 36457354 PMCID: PMC9678222 DOI: 10.46292/sci22-00008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Background People with a spinal cord injury (SCI) have a high rate of bowel-related morbidity, even compared with people with other neurological disorders. These complications lower quality of life and place a financial burden on the health system. A noninvasive intervention that improves the bowel function of people with an SCI should reduce morbidity, improve quality of life, and lead to cost savings for health care providers. Objectives To investigate the effectiveness of noninvasive abdominal functional electrical stimulation (FES) for improving bowel function in people with a chronic SCI. Methods A prospective, double-blinded, 1:1 randomized, placebo-controlled intervention trial will be conducted with 80 adults with chronic SCI (>12 months since injury) above T8 single neurological level. The intervention will be a 45-minute abdominal FES (or placebo) session, 3 days per week, for 6 weeks. Main Study Parameters/Endpoints Primary endpoint is whole gut transit time before and after 6 weeks of abdominal FES. Secondary endpoints measured before and after 6 weeks of abdominal FES are (1) colonic transit time; (2) quality of life (EQ-5D-5L); (3) participant-reported bowel function (International SCI Bowel Function Basic Data Set Questionnaire and visual analogue scale); (4) respiratory function (forced vital capacity, forced expiratory volume in 1 second, peak expiratory flow, maximal inspiratory pressure, and maximal expiratory pressure); (5) bladder symptoms (Neurogenic Bladder Symptom Score); (6) daily bowel management diary; and (7) unplanned hospital visits. Conclusion Safety data will be collected, and a cost utility analysis using quality of life scores will be performed. Trial registration Australian New Zealand Clinical Trials Registry (ANZCTR): ACTRN12621000386831.
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Affiliation(s)
- Gabrielle M Allen
- Neuroscience Research Australia, Randwick, New South Wales, Australia
- School of Medical Sciences, University of New South Wales, Kensington, New South Wales, Australia
| | - Anne E Palermo
- Neuroscience Research Australia, Randwick, New South Wales, Australia
- School of Medical Sciences, University of New South Wales, Kensington, New South Wales, Australia
| | - Keith M D McNaughton
- Neuroscience Research Australia, Randwick, New South Wales, Australia
- School of Medical Sciences, University of New South Wales, Kensington, New South Wales, Australia
| | - Claire L Boswell-Ruys
- Neuroscience Research Australia, Randwick, New South Wales, Australia
- School of Medical Sciences, University of New South Wales, Kensington, New South Wales, Australia
- Prince of Wales Hospital, Randwick, New South Wales, Australia
| | - Bonsan B Lee
- Neuroscience Research Australia, Randwick, New South Wales, Australia
- School of Medical Sciences, University of New South Wales, Kensington, New South Wales, Australia
- Prince of Wales Hospital, Randwick, New South Wales, Australia
| | - Jane E Butler
- Neuroscience Research Australia, Randwick, New South Wales, Australia
- School of Medical Sciences, University of New South Wales, Kensington, New South Wales, Australia
| | - Simon C Gandevia
- Neuroscience Research Australia, Randwick, New South Wales, Australia
- School of Medical Sciences, University of New South Wales, Kensington, New South Wales, Australia
- Prince of Wales Clinical School, University of New South Wales, Kensington, Australia
| | - Euan J McCaughey
- Neuroscience Research Australia, Randwick, New South Wales, Australia
- School of Medical Sciences, University of New South Wales, Kensington, New South Wales, Australia
- Queen Elizabeth National Spinal Injuries Unit, Queen Elizabeth University Hospital, Glasgow, Scotland
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Josefsson A, Törnblom H, Simrén M. Type of Rectal Barostat Protocol Affects Classification of Hypersensitivity and Prediction of Symptom Severity in Irritable Bowel Syndrome. J Neurogastroenterol Motil 2022; 28:630-641. [PMID: 36250370 PMCID: PMC9577574 DOI: 10.5056/jnm21214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 02/15/2022] [Accepted: 03/03/2022] [Indexed: 11/20/2022] Open
Abstract
Background/Aims Visceral hypersensitivity is an important pathophysiologic mechanism in irritable bowel syndrome (IBS). We compared 2 barostat distension protocols and their ability to distinguish between IBS patients and healthy controls, identify subjects with rectal hypersensitivity, and their associations with gastrointestinal symptom severity. Methods We retrospectively reviewed all patients at our unit that had undergone barostat investigations 2002-2014. Protocol 1 (n = 369) used phasic isobaric distensions with stepwise increments in pressure and protocol 2 (n = 153) used pressure controlled ramp inflations. Both protocols terminated when subjects reported pain or maximum pressure was reached. Thresholds for first sensation, urgency, discomfort and pain were established. Age- and gender-matched controls were used for comparison. The gastrointestinal symptom rating scale-IBS, and the hospital anxiety and depression scale were used for symptom reports. Results A significantly higher proportion of patients was classified as having hypersensitivity in protocol 1 vs protocol 2 for all thresholds (P < 0.001). Patients with visceral hypersensitivity, defined based on rectal pain thresholds in protocol 1 had more severe gastrointestinal symptoms overall as well as anxiety, whereas these associations were weaker or in most cases absent when visceral hypersensitivity was defined based on rectal pain thresholds in protocol 2. Conclusion Our study indicates that a rectal barostat protocol using phasic isobaric distensions with stepwise pressure increments is more sensitive in IBS patients with respect to identifying subjects with rectal hypersensitivity and a link with IBS symptoms.
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Affiliation(s)
- Axel Josefsson
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Hans Törnblom
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Magnus Simrén
- Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Center for Functional Gastrointestinal and Motility Disorders, University of North Carolina, Chapel Hill, NC, USA
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Baker JR, Curtin BF, Moshiree B, Rao SSC. Organizing and Developing a GI Motility Lab in Community Practice: Challenges and Rewards. Curr Gastroenterol Rep 2022; 24:73-87. [PMID: 35674875 DOI: 10.1007/s11894-022-00838-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PURPOSE OF REVIEW Neurogastroenterology and motility is a rapidly evolving subspecialty that encompasses over 33% of gastroenterological disorders, and up to 50% of referrals to gastroenterology practice. It includes common problems such as dysphagia, gastroesophageal reflux disease, irritable bowel syndrome, chronic constipation, gastroparesis, functional dyspepsia, gas/bloating, small intestinal bacterial overgrowth, food intolerance and fecal incontinence Standard diagnostic tests such as endoscopy or imaging are normal in these conditions. To define the underlying mechanism(s)/etiology of these disorders, diagnostic motility tests are often required. These are best performed by well-trained personnel in a dedicated motility laboratory. Our purpose is to provide an up-to-date overview on how to organize and develop a motility laboratory based on our collective experiences in setting up such facilities in academia and community practice. RECENT FINDINGS A lack of knowledge, training and facilities for providing diagnostic motility tests has led to suboptimal patient care. A motility laboratory is the hub for diagnostic and therapeutic motility procedures. Common procedures include esophageal function tests such as esophageal manometry and pH monitoring, anorectal function tests suchlike anorectal manometry, neurophysiology and balloon expulsion, dysbiosis and food intolerance tests such as hydrogen/methane breath tests, and gastrointestinal transit assessment. These tests provide an accurate diagnosis and guide clinical management including use of medications, biofeedback therapy, neuromodulation, behavioral therapies, evidence-based dietary interventions and endoscopic or surgical procedures. Further, there have been recent developments in billing and coding of motility procedures and training requirements that are not well known. This review provides a stepwise approach on how to set-up a motility laboratory in the community or academic practice and includes the rationale, infrastructure, staffing needs, commonly performed motility tests and their clinical utility, billing and coding strategies, training needs and economic considerations for setting up this service.
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Affiliation(s)
- Jason R Baker
- Atrium Health, Charlotte, NC, USA.,Neurogastroenterology and Motility Laboratory, 1025 Morehead Medical Drive, Suite 300, Charlotte, NC, 28209, USA
| | - Bryan F Curtin
- Division of Neurogastroenterology, The Institute for Digestive and Liver Disease, Mercy Medical Center, Baltimore, MD, USA
| | | | - Satish S C Rao
- Division of Neurogastroenterology/Motility, Augusta University Medical Center, Augusta, GA, USA.
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Curtin B, Jimenez E, Rao SSC. Clinical Evaluation of a Patient With Symptoms of Colonic or Anorectal Motility Disorders. J Neurogastroenterol Motil 2020; 26:423-436. [PMID: 32989182 PMCID: PMC7547199 DOI: 10.5056/jnm20012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 08/11/2020] [Accepted: 08/16/2020] [Indexed: 12/13/2022] Open
Abstract
Constipation, irritable bowel syndrome, fecal incontinence, abdominal pain, and anorectal pain are problems that affect 40% of the population. They commonly present with overlapping symptoms indicating that their pathophysiology affects multiple segments of the gut as well as brain and gut interactions. Clinically, although some conditions are readily recognized, dyssynergic defecation, fecal incontinence, and anorectal pain are often missed or misdiagnosed. Consequently, the assessment of lower gastrointestinal symptoms in patients with suspected colonic or anorectal motility disorder(s) remains challenging for most clinicians. A detailed history, use of the Bristol stool form scale, prospective stool diaries, ideally through a phone App, digital rectal examination, and judicious use of complementary diagnostic tests are essential. Additionally, it is important to evaluate the impact of these problems on quality of life and psychosocial issues, because they are intricately linked with these disorders. The Rome IV diagnostic questionnaire for functional gastrointestinal disorders can provide additional information often missed during history taking. Here, we discuss a systematic approach for the clinical evaluation of patients with suspected lower gastrointestinal problems, grouped under 4 common diagnostic categories. We describe how to take a detailed history, perform meticulous digital rectal examination, and use validated tools to supplement clinical evaluation, including assessments of quality of life and scoring systems for disease severity and digital Apps. These tools could facilitate a comprehensive plan for clinical management including diagnostic tests, and translate the patients' complaints into definable, diagnostic categories.
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Affiliation(s)
- Bryan Curtin
- Division of Gastroenterology and Hepatology, Digestive Health Center, Augusta University, Medical College of Georgia, Augusta, GA, USA
| | - Enoe Jimenez
- Division of Gastroenterology and Hepatology, Digestive Health Center, Augusta University, Medical College of Georgia, Augusta, GA, USA
| | - Satish S C Rao
- Division of Gastroenterology and Hepatology, Digestive Health Center, Augusta University, Medical College of Georgia, Augusta, GA, USA
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Jiang AC, Panara A, Yan Y, Rao SSC. Assessing Anorectal Function in Constipation and Fecal Incontinence. Gastroenterol Clin North Am 2020; 49:589-606. [PMID: 32718572 DOI: 10.1016/j.gtc.2020.04.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Constipation and fecal incontinence are commonly encountered complaints in the gastrointestinal clinic. Assessment of anorectal function includes comprehensive history, rectal examination, and prospective stool diary or electronic App diary that accurately captures bowel symptoms, evaluation of severity, and quality of life of measure. Evaluation of a suspected patient with dyssynergic constipation includes anorectal manometry, balloon expulsion test, and defecography. Investigation of a suspected patient with fecal incontinence includes high-resolution anorectal manometry; anal ultrasound or MRI; and neurophysiology tests, such as translumbosacral anorectal magnetic stimulation or pudendal nerve latency. This article provides an approach to the assessment of anorectal function.
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Affiliation(s)
- Alice C Jiang
- Division of Gastroenterology, Department of Internal Medicine, Rush University Medical Center, 600 S Paulina St, Chicago, IL 60612, USA
| | - Ami Panara
- Division of Gastroenterology, Department of Internal Medicine, University of Miami Leonard M. Miller School of Medicine, 1601 NW 12th Ave, Miami, FL, USA
| | - Yun Yan
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Augusta University, Augusta, GA, USA
| | - Satish S C Rao
- Division of Gastroenterology and Hepatology, Augusta University Medical Center, 1120 15th Street, AD 2226, Augusta, GA 30912, USA.
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Du P, Liu JYH, Sukasem A, Qian A, Calder S, Rudd JA. Recent progress in electrophysiology and motility mapping of the gastrointestinal tract using multi-channel devices. J R Soc N Z 2020. [DOI: 10.1080/03036758.2020.1735455] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Peng Du
- Auckland Bioengineering Institute, The University of Auckland, Auckland, New Zealand
- Department of Engineering Science, The University of Auckland, Auckland, New Zealand
| | - Julia Y. H. Liu
- Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, People’s Republic of China
| | - Atchariya Sukasem
- Auckland Bioengineering Institute, The University of Auckland, Auckland, New Zealand
| | - Anna Qian
- Auckland Bioengineering Institute, The University of Auckland, Auckland, New Zealand
| | - Stefan Calder
- Auckland Bioengineering Institute, The University of Auckland, Auckland, New Zealand
| | - John A. Rudd
- Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, People’s Republic of China
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Wang XJ, Camilleri M. Personalized medicine in functional gastrointestinal disorders: Understanding pathogenesis to increase diagnostic and treatment efficacy. World J Gastroenterol 2019; 25:1185-1196. [PMID: 30886502 PMCID: PMC6421234 DOI: 10.3748/wjg.v25.i10.1185] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 02/04/2019] [Accepted: 02/23/2019] [Indexed: 02/06/2023] Open
Abstract
There is overwhelming evidence that functional gastrointestinal disorders (FGIDs) are associated with specific mechanisms that constitute important targets for personalized treatment. There are specific mechanisms in patients presenting with functional upper gastrointestinal symptoms (UGI Sx). Among patients with UGI Sx, approximately equal proportions (25%) of patients have delayed gastric emptying (GE), reduced gastric accommodation (GA), both impaired GE and GA, or neither, presumably due to increased gastric or duodenal sensitivity. Treatments targeted to the underlying pathophysiology utilize prokinetics, gastric relaxants, or central neuromodulators. Similarly, specific mechanisms in patients presenting with functional lower gastrointestinal symptoms, especially with diarrhea or constipation, are recognized, including at least 30% of patients with functional constipation pelvic floor dyssynergia and 5% has colonic inertia (with neural or interstitial cells of Cajal loss in myenteric plexus); 25% of patients with diarrhea-predominant irritable bowel syndrome (IBSD) has evidence of bile acid diarrhea; and, depending on ethnicity, a varying proportion of patients has disaccharidase deficiency, and less often sucrose-isomaltase deficiency. Among patients with predominant pain or bloating, the role of fermentable oligosaccharides, disaccharides, monosaccharides and polyols should be considered. Personalization is applied through pharmacogenomics related to drug pharmacokinetics, specifically the role of CYP2D6, 2C19 and 3A4 in the use of drugs for treatment of patients with FGIDs. Single mutations or multiple genetic variants are relatively rare, with limited impact to date on the understanding or treatment of FGIDs. The role of mucosal gene expression in FGIDs, particularly in IBS-D, is the subject of ongoing research. In summary, the time for personalization of FGIDs, based on deep phenotyping, is here; pharmacogenomics is relevant in the use of central neuromodulators. There is still unclear impact of the role of genetics in the management of FGIDs.
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Affiliation(s)
- Xiao Jing Wang
- Division of Gastroenterology and Hepatology, Clinical Enteric Neuroscience Translational and Epidemiological Research, Mayo Clinic, Rochester, MN 55905, United States
| | - Michael Camilleri
- Division of Gastroenterology and Hepatology, Clinical Enteric Neuroscience Translational and Epidemiological Research, Mayo Clinic, Rochester, MN 55905, United States
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9
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Intraluminal pressure patterns in the human colon assessed by high-resolution manometry. Sci Rep 2017; 7:41436. [PMID: 28216670 PMCID: PMC5316981 DOI: 10.1038/srep41436] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 12/13/2016] [Indexed: 02/08/2023] Open
Abstract
Assessment of colonic motor dysfunction is rarely done because of inadequate methodology and lack of knowledge about normal motor patterns. Here we report on elucidation of intraluminal pressure patterns using High Resolution Colonic Manometry during a baseline period and in response to a meal, in 15 patients with constipation, chronically dependent on laxatives, 5 healthy volunteers and 9 patients with minor, transient, IBS-like symptoms but no sign of constipation. Simultaneous pressure waves (SPWs) were the most prominent propulsive motor pattern, associated with gas expulsion and anal sphincter relaxation, inferred to be associated with fast propagating contractions. Isolated pressure transients occurred in most sensors, ranging in amplitude from 5–230 mmHg. Rhythmic haustral boundary pressure transients occurred at sensors about 4–5 cm apart. Synchronized haustral pressure waves, covering 3–5 cm of the colon occurred to create a characteristic intrahaustral cyclic motor pattern at 3–6 cycles/min, propagating in mixed direction. This activity abruptly alternated with erratic patterns resembling the segmentation motor pattern of the small intestine. High amplitude propagating pressure waves (HAPWs) were too rare to contribute to function assessment in most subjects. Most patients, dependent on laxatives for defecation, were able to generate normal motor patterns in response to a meal.
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Borrelli O, Pescarin M, Saliakellis E, Tambucci R, Quitadamo P, Valitutti F, Rybak A, Lindley KJ, Thapar N. Sequential incremental doses of bisacodyl increase the diagnostic accuracy of colonic manometry. Neurogastroenterol Motil 2016; 28:1747-1755. [PMID: 27335210 DOI: 10.1111/nmo.12876] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 05/09/2016] [Indexed: 12/11/2022]
Abstract
BACKGROUND Colonic manometry is the standard diagnostic modality for evaluating colonic motility in children. Intraluminal bisacodyl is routinely used to trigger high-amplitude propagating contractions (HAPCs), a feature of normal colonic motility. Usually, only a single dose (0.2 mg/kg) is suggested. We retrospectively explored whether the use of an additional higher (0.4 mg/kg) dose of bisacodyl increases the yield of colonic manometry. METHODS In 103 children (median age: 8.8 years, range 3.2-15.7 years) with a diagnosis of slow transit constipation, colonic motility was recorded for 1 h before and 1 h after each of two incremental doses of bisacodyl (low, L, dose: 0.2 mg/kg, max 10 mg; high, H, dose: 0.4 mg/kg, max 20 mg) and the characteristics of HAPCs analyzed. KEY RESULTS High-amplitude propagating contractions were seen in 85 children. H dose significantly increased the proportion of patients with fully propagated HAPCs (H dose: 57/103 [55%], L dose: 27/103 [26%], p < 0.001), paralleling the significant decrease in the proportion with partially propagated HAPCs (H dose: 29/103 [28%], L dose: 47/103 [46%], p < 0.01). Mean HAPC number significantly increased throughout the colon at H compared to L dose (7.2 ± 5.05 vs 5.6 ± 5.1, p < 0.05). Finally, the proportion of patients with normal pressure wave morphology of HAPCs significantly increased with higher dose (H dose: 55/85 [65%], L dose: 27/85 [32%], p < 0.001). CONCLUSIONS & INTERFERENCES An additional higher dose of bisacodyl during colonic manometry improves colonic neuromuscular function suggesting its use might improve interpretation and decision making in children with slow transit constipation.
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Affiliation(s)
- O Borrelli
- Division of Neurogastroenterology & Motility, Department of Pediatric Gastroenterology, Great Ormond Street Hospital, London, UK.
| | - M Pescarin
- Division of Neurogastroenterology & Motility, Department of Pediatric Gastroenterology, Great Ormond Street Hospital, London, UK
| | - E Saliakellis
- Division of Neurogastroenterology & Motility, Department of Pediatric Gastroenterology, Great Ormond Street Hospital, London, UK
| | - R Tambucci
- Division of Neurogastroenterology & Motility, Department of Pediatric Gastroenterology, Great Ormond Street Hospital, London, UK
| | - P Quitadamo
- Division of Neurogastroenterology & Motility, Department of Pediatric Gastroenterology, Great Ormond Street Hospital, London, UK
| | - F Valitutti
- Division of Neurogastroenterology & Motility, Department of Pediatric Gastroenterology, Great Ormond Street Hospital, London, UK
| | - A Rybak
- Division of Neurogastroenterology & Motility, Department of Pediatric Gastroenterology, Great Ormond Street Hospital, London, UK.,Department of Gastroenterology, Hepatology, Nutrition Disorders and Pediatrics, Children's Memorial Health Institute, Warsaw, Poland
| | - K J Lindley
- Division of Neurogastroenterology & Motility, Department of Pediatric Gastroenterology, Great Ormond Street Hospital, London, UK
| | - N Thapar
- Division of Neurogastroenterology & Motility, Department of Pediatric Gastroenterology, Great Ormond Street Hospital, London, UK.,Stem Cells and Regenerative Medicine, UCL Institute of Child Health, London, UK
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