Medicine
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This repository contains the published and unpublished research of the Faculty of Medicine by the staff members of the faculty
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Item How do we define normal bowel frequency from newborn to teens?:A Bayesian meta-analysis(Wiley, 2024-12) Munasinghe, S.; Manathunga, S.; Hathagoda, W.; Kuruppu, C.; Ranasinghe, P.; Devanarayana, N. M.; Baaleman, D. F.; Benninga, M. A.; Rajindrajith, S.OBJECTIVES Defecation disorders are a common pediatric problem and bowel frequency is crucial in identifying them. The aim of this analysis is to define normal bowel frequencies in healthy children ranging from newborns to adolescents. METHODS A literature search was conducted using MEDLINE, SCOPUS, EMBASE, Cochrane Library, and Web of Science from their inception to February 2024, aiming to identify studies reporting bowel habits of healthy children (0–18 years). A Bayesian distribution modeling approach was adopted to pool the mean frequency of bowel opening using inverse-variance weighing. A subgroup analysis and a meta-regression were performed with Bayesian generalized additive mixed distributional models. The methodological quality of the articles was evaluated using the Newcastle–Ottawa Scale modified for cross-sectional studies. RESULTS Seventeen studies were included in the analysis, including 22,698 children aged from 0 to 18 years. The subgroup meta-analysis showed mean bowel frequencies for newborns, 1–6 months, 6–12 months, 1–2 years, 2–5 years, and over 5 years are 3.24 (95% credible interval [CrI]: 2.83–3.63), 1.99 (95% CrI: 1.77-2.19), 1.66 (95% CrI: 1.45–1.88), 1.53 (95% CrI: 1.37–1.7), 1.15 (95% CrI: 0.99–1.31), and 1.02 (95% CrI 0.88–1.18), respectively. Between studies, heterogeneity demonstrated a near-normal distribution with a mean of 0.16 and a 95% CrI of 0.04–0.28. The variance of the distribution of mean bowel frequency reduced with age. DISCUSSION In this Bayesian meta-analysis, we found that younger children have a higher bowel frequency. The reported bowel frequencies for each age group could serve as normal values in clinical practice to differentiate health and disease.Item Association between childhood constipation and exposure to stressful life events: a systematic review(Blackwell Scientific Publications, 2022) Liyanarachchi, H.; Rajindrajith, S.; Kuruppu, C.; Chathurangana, P.; Ranawaka, R.; Devanarayana, N.M.; Benninga, M.A.BACKGROUND: Several cross-sectional studies have reported an association between childhood constipation and exposure to stressful events. We planned to systematically review the literature on constipation and its associated stressful events. METHODS: PubMed, Embase, and PsycINFO databases were searched (until February 2021) using standard search terms related to "constipation" and "stress" from 0 to 18 years that describe the association between psychological stressors and constipation. Studies were screened using pre-designed eligibility criteria. Studies that fulfilled the criteria were reviewed in a full-text format. The quality assessment of selected articles was conducted using standard methods. KEY RESULTS: Of 2296 titles and abstracts screened, 38 were included in the full-text review. Out of that, 15 articles were included in this systematic review. There were 2954 children with constipation, and the age range was from 6 months to 16 years. Exposure to home-related stressors (divorce or separation of parents, severe illness in family, and parental job loss) school-related stressors (including being bullied at school, change in school, separation from the best friend at school, and failure in an examination), exposure to child maltreatments and exposure to war/civil unrest were associated with childhood constipation. CONCLUSIONS AND INFERENCES: Exposure to day-to-day home- and school-related stressors, to child maltreatment, and to civil unrest is associated with constipation in children and adolescents. These factors need to be explored during clinical evaluation of children with constipation. KEYWORDS: adolescents; child maltreatment; children; civil unrest; constipation; stress.