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Prevalence, symptoms and risk factor profile of rumination syndrome and functional dyspepsia: a population-based study.

PMID: 34626489 (view PubMed database entry)
DOI: 10.1111/apt.16630 (read at publisher's website )

Mudar Zand Irani, Michael P Jones, Magnus Halland, Linda Herrick, Rok Seon Choung, Yuri A Saito Loftus, Marjorie M Walker, Joseph A Murray, Nicholas J Talley,

<h4>Background</h4>Rumination syndrome is a functional gastroduodenal disorder characterised by effortless regurgitation of recently ingested food. Emerging evidence reports duodenal eosinophilic inflammation in a subset, suggesting a shared pathophysiology with functional dyspepsia (FD).<h4>Aim</h4>To assess the clinical features of rumination syndrome and FD in a community-based study.<h4>Methods</h4>We mailed a survey assessing gastrointestinal symptoms, diet and psychological symptoms to 9835 residents of Olmsted County, MN, USA in 2017-2018; diagnostic codes were obtained from linked clinical records. The two disorders were assessed as mutually exclusive in 'pure' forms with a separate overlap group, all compared to a control group not meeting criteria for either. Prevalence of associations, and univariate and independent associations with predictors were assessed by logistic regression.<h4>Results</h4>Prevalence of rumination syndrome and FD were 5.8% and 7.1%, respectively; the overlap was 3.83-times more likely than expected by chance. Independent predictors for rumination (odds ratio (OR), 95% confidence interval (CI)) were female gender (1.79, 1.21-2.63), smoking (1.89, 1.28-2.78), gluten-free diet (1.58, 1.14-2.19), allergic rhinitis (1.45, 1.01-2.08) and depression (1.10, 1.05-1.16). FD was independently associated with female gender, depression, non-coeliac wheat sensitivity, migraine, irritable bowel syndrome and somatic symptoms. A similar reported efficacy (≥54%) of low fat or dairy-free diets was found with both disorders (P = 0.53 and P = 1.00, respectively). The strongest independent associations with overlapping FD and rumination syndrome were a history of rheumatoid arthritis (3.93, 1.28-12.06) and asthma (3.02, 1.44-6.34).<h4>Conclusion</h4>Rumination syndrome overlaps with FD with a shared risk factor profile, suggesting a common pathophysiology.

Aliment Pharmacol Ther (Alimentary pharmacology & therapeutics)
[2021, :]

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