rimary Mechanism Defect Decreased motility Defect in neuromuscula r unit (s) Stool Examination Examples Comment Loose to normal Pseudoobstructio appearing stool n Blind loops Possible bacterial overgrowth Loose to normal appearing stool, stimulated by gastrocolic reflex Infection may also contribute to increased motility Stasis (bacterial overgrowth) Increased motility Decreased transit time IBS, thyrotoxicosis, postvagotomy dumping syndrome