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Mechanisms of dysfunction

Ileocecal vulnerability

Hypothesis Mechanism review
barrier microbiome mechanism marker technique
Editor's note
The ileocecal valve emerges as a mechanical linchpin in small intestinal bacterial overgrowth—a finding that reframes SIBO from purely dysbiotic to mechanically preventable. This bridges a long-standing gap between barrier anatomy and clinical dysfunction, though the evidence remains early and causality incompletely mapped. Gastroenterologists managing refractory SIBO and motility specialists should particularly attend to valve assessment as a diagnostic and potential therapeutic target.

Patients with SIBO have significantly lower ileocecal pressure thresholds, prolonged small bowel transit time, and higher gastrointestinal pH compared to those without SIBO.

The small intestinal epithelium lacks the thick protective mucus layer of the colon, so microbes that colonize the thin small intestinal mucosa can exert significant effects on the host. Motor abnormalities compromise the small intestine's ability to prevent colonic bacterial translocation, while ileocecal valve dysfunction enables colonic bacterial backflow.

Diagnostic worth considering: ileocecal valve motility testing, wireless motility capsule (measures pressure and pH throughout the tract), MR enterography to rule out strictures.

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Published 2026-05-24 · Last kit-update 2026-05-24