Clinical meaning
Whipple disease is a rare, chronic systemic infection caused by Tropheryma whipplei, a gram-positive actinobacterium that infects macrophages throughout the body. The bacterium is phagocytosed by tissue macrophages but resists intracellular killing, replicating within the phagolysosome and accumulating in large numbers within foamy macrophages that distend the lamina propria of the small intestine, obstruct lymphatic drainage, and infiltrate multiple organs. Small intestinal involvement causes malabsorption (diarrhea, steatorrhea, weight loss, abdominal pain) through villous blunting, lymphatic obstruction, and mucosal inflammation. Diagnosis is confirmed by periodic acid-Schiff (PAS)-positive macrophages on small bowel biopsy, which stain the intracellular bacterial cell wall glycoprotein. Systemic manifestations include migratory polyarthralgia (often the earliest symptom, preceding GI symptoms by years), cardiac involvement (culture-negative endocarditis), neurological involvement (cognitive changes, supranuclear ophthalmoplegia, oculomasticatory myorhythmia -- pathognomonic), and lymphadenopathy. The nurse monitors nutritional status and weight, administers prolonged antibiotic therapy (IV ceftriaxone for 2 weeks followed by oral TMP-SMX for 1 year), monitors for treatment complications and relapse, assesses joint symptoms, performs neurological assessments, monitors for cardiac involvement, supplements fat-soluble vitamins and nutritional deficiencies, and educates about the importance of completing the full antibiotic course.