Which TMP occurs primarily in children and is associated with enterohemorrhagic E. coli infection?

Which TMP occurs primarily in children and is associated with enterohemorrhagic E. coli infection?

• A. Thrombotic thrombocytopenia purpura
• B. Hemolytic-uremic syndrome
• C. Disseminated intravascular coagulation
• D. Idiopathic thrombocytopenia purpura

Answer: (B)

Enterohemorrhagic E. coli infection in children most often leads to a thrombotic microangiopathy called hemolytic-uremic syndrome. After a diarrheal illness, especially with bloody stools, young patients can develop a triad of microangiopathic hemolytic anemia, thrombocytopenia, and acute kidney injury. The Shiga toxin produced by the EHEC damages the endothelial lining of small vessels, particularly in the kidneys, triggering platelet activation and formation of microthrombi. Red blood cells are sheared as they traverse these narrowed vessels, producing schistocytes, elevated LDH, and reduced haptoglobin, while kidneys show dysfunction from microvascular injury. Management is mainly supportive—ensuring adequate fluid balance, monitoring, and renal support if needed. Avoid antibiotics or antimotility drugs in suspected EHEC infection, as they can increase toxin release and worsen HUS. Diagnosis relies on the combination of MAHA, thrombocytopenia, and AKI, with stool testing for Shiga toxin-producing organisms. This pattern helps distinguish it from other causes: TTP tends to feature neurologic symptoms and less prominent kidney injury early on; DIC shows abnormal coagulation tests and widespread bleeding or clotting; ITP presents as isolated thrombocytopenia without hemolysis or renal failure.

Enterohemorrhagic E. coli infection in children most often leads to a thrombotic microangiopathy called hemolytic-uremic syndrome. After a diarrheal illness, especially with bloody stools, young patients can develop a triad of microangiopathic hemolytic anemia, thrombocytopenia, and acute kidney injury. The Shiga toxin produced by the EHEC damages the endothelial lining of small vessels, particularly in the kidneys, triggering platelet activation and formation of microthrombi. Red blood cells are sheared as they traverse these narrowed vessels, producing schistocytes, elevated LDH, and reduced haptoglobin, while kidneys show dysfunction from microvascular injury.

Management is mainly supportive—ensuring adequate fluid balance, monitoring, and renal support if needed. Avoid antibiotics or antimotility drugs in suspected EHEC infection, as they can increase toxin release and worsen HUS. Diagnosis relies on the combination of MAHA, thrombocytopenia, and AKI, with stool testing for Shiga toxin-producing organisms.

This pattern helps distinguish it from other causes: TTP tends to feature neurologic symptoms and less prominent kidney injury early on; DIC shows abnormal coagulation tests and widespread bleeding or clotting; ITP presents as isolated thrombocytopenia without hemolysis or renal failure.