Overview
Chronic diarrhea is defined as loose, watery stools occurring more than three times daily for more than four weeks, often necessitating a thorough evaluation to distinguish between organic and functional causes 13.Diagnosis
Initial Assessment: Comprehensive history and physical examination to identify potential triggers and underlying conditions 3.
Biochemical Tests: Complete blood count, acute phase reactants, serum albumin, iron, and stool cultures for pathogens 1.
Lactulose/Mannitol Test: High efficacy in excluding organic causes; useful for assessing intestinal permeability 1.
Targeted Investigations: Directed by clinical features and initial test results, including endoscopy, imaging, and specialized stool analyses 3.Management
Functional Diarrhea: Dietary modifications, such as low-FODMAP diet, and behavioral therapies 3.
Irritable Bowel Syndrome (IBS): Antispasmodics (e.g., hyoscine butylbromide), laxatives (e.g., lactulose), and antidepressants (e.g., low-dose tricyclic antidepressants) 3.
Inflammatory Bowel Disease (IBD): Anti-inflammatory drugs (e.g., aminosalicylates, corticosteroids), immunomodulators, and biologics as indicated 3.
Malabsorption Syndromes: Specific vitamin and nutrient supplementation based on identified deficiencies 3.Special Populations
Pregnancy: Management focuses on symptom relief with safe medications; dietary adjustments are crucial 3.
Elderly: Increased vigilance for complications; tailored treatment considering comorbidities and medication interactions 3.Key Recommendations
Utilize the lactulose/mannitol test for evaluating intestinal permeability and excluding organic causes of chronic diarrhea (Evidence: Moderate) 1.
Tailor diagnostic investigations based on clinical presentation and initial test results to efficiently identify underlying causes (Evidence: Expert opinion) 3.
Implement dietary modifications and behavioral therapies as first-line treatments for functional diarrhea (Evidence: Moderate) 3.
Consider specific pharmacological interventions based on the identified condition (e.g., antispasmodics for IBS, anti-inflammatory agents for IBD) (Evidence: Moderate) 3.References
1 Di Leo V, D'Incà R, Diaz-Granado N, Fries W, Venturi C, D'Odorico A et al.. Lactulose/mannitol test has high efficacy for excluding organic causes of chronic diarrhea. The American journal of gastroenterology 2003. link
2 Fine KD, Schiller LR. AGA technical review on the evaluation and management of chronic diarrhea. Gastroenterology 1999. link70513-5)
3 . American Gastroenterological Association medical position statement: guidelines for the evaluation and management of chronic diarrhea. Gastroenterology 1999. link70512-3)