The patient with refractory diarrhoea.

Area of Science:

• Gastroenterology
• Clinical Medicine

Background:

• Persistent diarrhea poses a significant clinical challenge globally.
• Effective management necessitates a logical, hierarchical investigative strategy to optimize resource use and minimize patient risk.

Purpose of the Study:

• To present a systematic 5-step approach for investigating persistent diarrhea.
• To guide clinicians in excluding common causes and identifying rarer conditions like neuroendocrine or fictitious diarrhea.

Main Methods:

• Exclusion of functional diarrhea early, potentially via 24-hour fecal weight measurement.
• Sequential introduction of invasive tests (e.g., endoscopy) after excluding infection, drugs, and laxatives.
• Utilizing fluid balance studies, fecal osmolality, and biochemical analyses for complex cases.

Main Results:

• A 5-step process is detailed for efficient diagnosis of persistent diarrhea.
• Highlights the importance of excluding common causes before considering rarer etiologies.
• Illustrates the diagnostic utility of specific tests in challenging cases, such as fictitious diarrhea.

Conclusions:

• A structured, hierarchical investigation is crucial for managing persistent diarrhea effectively.
• Early exclusion of functional diarrhea and systematic testing aid in timely diagnosis.
• Comprehensive analysis, including biochemical studies, is vital for refractory cases.