Chapter 12: Diarrhea Evaluation & Management

Diarrhea Evaluation & Management provides a comprehensive guide to distinguishing between acute and chronic presentations in both pediatric and adult populations, emphasizing that acute cases are often viral and self-limiting, while chronic cases may indicate malabsorption, inflammatory bowel disease (IBD), or parasitic infections. The text outlines critical elements of the focused history, including stool frequency, volume, consistency using the Bristol Stool Form Scale, and the presence of blood, mucus, or fat (steatorrhea). Significant attention is given to assessing hydration status, noting that dehydration in infants presents with specific signs like sunken fontanels, lack of tears, and decreased wet diapers, whereas adults are monitored for thirst, orthostatic changes, and urine specific gravity. The chapter explores various risk factors, including travel history, antibiotic use leading to Clostridium difficile (C. diff) colitis, day care attendance, and dietary triggers such as lactose or gluten in Celiac disease. Physical examination techniques are described extensively, focusing on abdominal auscultation for bowel sounds, palpation for tenderness or masses, and digital rectal exams to detect impaction or occult blood. Diagnostic strategies are reviewed, ranging from fecal leukocyte testing and stool cultures to identifying specific pathogens like Salmonella, Shigella, Campylobacter, Escherichia coli O157:H7, and parasites like Giardia and Cryptosporidium. The summary also covers serious complications such as Hemolytic Uremic Syndrome (HUS) and necrotizing enterocolitis in neonates. Finally, the text differentiates between functional disorders like Irritable Bowel Syndrome (IBS) and organic diseases like Ulcerative Colitis and Crohn disease, providing a structured approach to laboratory studies and when to refer for endoscopic evaluation.