Research Appraisals
Evidence-based critical appraisals of the latest medical research, systematically evaluated using Oxford CEBM methodology.
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European journal of pediatrics
Probiotics in pediatric functional abdominal pain disorders: a systematic review and meta-analysis
UNLABELLED: Functional abdominal pain disorders (FAPDs), currently referred to as abdominal pain-related disorders of gut-brain interaction (AP-DGBIs), are characterized by recurrent abdominal discomfort in children that cannot be fully explained by an identifiable organic disorder. Probiotics are increasingly used as microbiota-targeted treatments, although their true clinical benefit remains uncertain. The objective of this study is to evaluate the efficacy and safety of probiotic supplementation compared with placebo in children with AP-DGBIs. PubMed, Embase, Web of Science and Scopus were searched from the start of each database to April 2026; the review followed PRISMA guidelines. Randomized controlled trials in patients < 18 years with FAPDs (IBS, FAP-NOS, functional dyspepsia, abdominal migraine) diagnosed by Rome II-IV, in which probiotic supplementation was evaluated. Two reviewers independently extracted data and assessed risk of bias using RoB2 tool. Meta-analyses and network meta-analyses were used to synthesize the data; the certainty of the evidence was evaluated using GRADE and CINeMA. This review covers 21 trials (2005-2025) with 1899 patients treatments completed. Probiotics modestly reduced pain intensity and weekly pain episodes, and modestly increased the rate of complete symptom resolution compared with placebo. Treatment with probiotics was associated with complete symptom resolution in 35.3% versus 22.8% of placebo-treated patients, corresponding to a number needed to treat (NNT) of 7 (95%CI = 3.97-29.04). However, the certainty of evidence was rated as low to moderate across outcomes. Moreover, from a clinical perspective, when success was defined as an improvement in symptoms according to an author-defined threshold, probiotic supplementation was not associated with different response rates compared with placebo. CONCLUSION: Probiotics provide modest symptom relief in pediatric FAPDs and may be considered a safe adjunctive therapy rather than a stand-alone treatment. While these findings are in line with the ESPGHAN/NASPGHAN 2025 guidelines, larger standardized trials are required to define optimal strain selection, dosage and treatment duration. TRIAL REGISTRATION: https://www.crd.york.ac.uk/PROSPERO/view/CRD420251149947 , identifier CRD420251149947. WHAT IS KNOWN: • AP-DGBIs (formerly FAPDs) are common childhood disorders characterized by recurrent abdominal pain without identifiable organic disease. • Probiotics are increasingly used to restore gut microbial balance, but their clinical benefit remains uncertain. WHAT IS NEW: • Our meta-analysis showed that probiotic supplementation reduced pain intensity and weekly pain episodes and increased symptom resolution versus placebo. • Benefi ts were modest, with substantial heterogeneity across studies and low-to-moderate certainty of evidence.
21 July 2026
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Efficacy of Internet-Based Self-Help Interventions for Irritable Bowel Syndrome: Systematic Review and Meta-Analysis of Randomized Controlled Trials
BACKGROUND: Irritable bowel syndrome (IBS) is a common functional gastrointestinal disorder that reduces quality of life and causes a heavy medical burden. Internet-based self-help interventions are flexible and scalable, showing potential for IBS symptom improvement, but relevant evidence is fragmented and lacks systematic review. OBJECTIVE: This systematic review aimed to comprehensively evaluate the effects of internet-based self-help interventions on symptom severity, quality of life, and visceral sensitivity, as well as comorbid depressive and anxiety symptoms, in individuals with IBS. METHODS: Only randomized controlled trials evaluating internet-based self-help interventions for individuals with IBS were included. A literature search was conducted across PubMed, Embase, Web of Science, CINAHL Complete, PsycINFO, the Cochrane Library, and 4 Chinese databases on June 25, 2025, with an updated search on March 9, 2026. Risk of bias was assessed using the Cochrane Risk of Bias 2.0 tool. Meta-analyses were performed with the Hartung-Knapp-Sidik-Jonkman-adjusted random-effects model. Effect sizes were reported as standardized mean differences (SMDs) with 95% CIs, and evidence certainty was evaluated using GRADE (Grading of Recommendations Assessment, Development, and Evaluation) criteria. RESULTS: A total of 17 randomized controlled trials from 7 countries were included, involving 2289 participants (predominantly female). Compared with control groups, internet-based self-help interventions were associated with a statistically significant improvement in IBS symptom severity (SMD -0.52, 95% CI -0.78 to -0.26, 95% prediction interval [PI] -1.46 to 0.42), quality of life (SMD 0.57, 95% CI 0.23 to 0.90, 95% PI -0.41 to 1.54), visceral sensitivity (SMD -0.55, 95% CI -0.89 to -0.21, 95% PI -1.43 to 0.33), and depressive symptoms (SMD -0.14, 95% CI -0.27 to -0.01, 95% PI -0.27 to -0.01). However, no statistically significant improvement was observed in anxiety symptoms (SMD -0.03, 95% CI -0.34 to 0.27, 95% PI -0.78 to 0.71). The certainty of evidence was rated as moderate to very low for all outcomes. CONCLUSIONS: This review synthesizes the latest evidence on internet-based self-help interventions for individuals with IBS disease-specific and comorbid psychological symptoms. It stands out by encompassing a diverse range of such interventions and incorporating visceral sensitivity as a key outcome. In doing so, it establishes a more comprehensive multi-outcome evidence base for IBS digital interventions, advancing the field by clarifying the potential of these interventions as viable alternatives to conventional treatments. For real-world practice, these findings can inform targeted strategies for primary care and telemedicine platforms, especially in resource-limited regions. However, this review is limited by moderate bias risk, high heterogeneity, and moderate to very low GRADE evidence certainty. A wide 95% PI suggests that effect variability is linked to contextual and population factors, so findings should be interpreted cautiously. Future research should prioritize technical support, patients' digital health literacy, and standardized intervention protocols to further validate clinical utility.
22 May 2026
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