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Post diarrheal sundrome

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"hemolytic uremic syndrome" AND diarrhea

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CDC hemolytic uremic syndrome Shiga toxin E. coli treatment antibiotics anti-diarrheal

Post-diarrheal syndrome usually refers to diarrhea-associated hemolytic uremic syndrome (D+ HUS).
  • It most often occurs about 5-10 days after bloody diarrhea, commonly caused by Shiga toxin-producing E. coli (STEC, such as O157:H7), and less commonly Shigella dysenteriae.
  • Shiga toxin injures vascular endothelium, especially in the kidneys, causing platelet-rich microthrombi.

Classic triad

  1. Microangiopathic hemolytic anemia: pallor, fatigue, jaundice, schistocytes on peripheral smear, high LDH
  2. Thrombocytopenia: bruising or petechiae
  3. Acute kidney injury: oliguria, edema, hypertension, raised creatinine

Management

  • Urgent hospital assessment, especially for a child with reduced urine, pallor, lethargy, bruising, swelling, or ongoing bloody stool.
  • Main treatment is careful supportive care: hydration and electrolyte management, blood-pressure monitoring, and dialysis if needed. Severe anemia may require red-cell transfusion.
  • Avoid antimotility agents such as loperamide in bloody diarrhea or suspected STEC infection.
  • Do not start antibiotics on your own when STEC is suspected, because they may increase HUS risk. The CDC clinician guidance recommends avoiding these agents in STEC and emphasizes rehydration.
Most patients recover, but some can have persistent hypertension, proteinuria, or reduced kidney function, so follow-up is needed.
If you instead mean post-infectious irritable bowel syndrome, that is a different condition: persistent abdominal pain, bloating, and altered bowel habits after gastroenteritis, without anemia, low platelets, or kidney injury.

Y schistocytes r seen

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hemolytic uremic syndrome schistocytes microangiopathic hemolysis mechanism

In post-diarrheal HUS, Shiga toxin damages endothelial cells, especially in renal small vessels. This triggers platelet activation and formation of microthrombi.
As red blood cells pass through these partially blocked, fibrin- and platelet-rich small vessels, they are mechanically sheared into fragments. These fragmented RBCs are called schistocytes or helmet cells.
So:
Endothelial injury → microvascular thrombi → RBC fragmentation → schistocytes + intravascular hemolysis
This is called microangiopathic hemolytic anemia (MAHA). It also produces:
  • Increased LDH
  • Increased indirect bilirubin
  • Reduced haptoglobin
  • Reticulocytosis
  • Anemia
Platelets are consumed in the microthrombi, hence thrombocytopenia.
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