A Toddler, a Burger, a Falling Count - Nephrology clinical simulation case. A 22-month-old boy brought by ambulance for listlessness, pallor, dark urine,...
Age: 2 • Gender: Male • Setting: Emergency Triage
Clinical Presentation & History
A 22-month-old boy brought by ambulance for listlessness, pallor, dark urine, and reduced wet diapers. Five days ago he developed bloody diarrhea after a family picnic with undercooked ground beef; diarrhea resolved two days ago. Today he became increasingly pale, stopped urinating, and shows petechiae on his lower limbs.
Acute Resuscitation Milestones & Priorities
Clinical phases and key interventions encountered in this emergency module:
Post-diarrheal (typical) HUS is a clinical triad: microangiopathic hemolytic anemia, thrombocytopenia, and AKI, classically following bloody diarrhea from undercooked beef contaminated with Shiga toxin–producing E. coli O157:H7.
Avoid antibiotics and antimotility agents in suspected STEC infection—each can increase Shiga toxin release or absorption and worsen progression to HUS.
Prophylactic platelet transfusion in HUS is discouraged except for life-threatening bleeding or before invasive procedures, as it fuels microvascular thrombosis.
Hyperkalemia in oligoanuric HUS requires immediate membrane stabilization (calcium) and intracellular shift (insulin/dextrose, beta-agonist) followed promptly by renal replacement therapy; loop diuretics do not reverse intrinsic AKI.
Peritoneal dialysis is the preferred modality of renal replacement therapy in small children with HUS-related AKI; it is continuous, hemodynamically gentle, and avoids systemic anticoagulation.
ICU admission is mandatory for severe HUS with neurologic involvement or hypertensive crisis; discharge criteria require sustained diuresis, stable electrolytes off dialysis, and resolved hypertension.
Test Your Clinical Reasoning in Real Time
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