Hemolytic-uremic syndromeHUS; STEC-HUS; Hemolytic-uremic syndrome
Shiga-like toxin producing E coli hemolytic-uremic syndrome (STEC-HUS) is a disorder that most often occurs when an infection in the digestive system produces toxic substances. These substances destroy red blood cells and cause kidney injury.
Hemolytic-uremic syndrome (HUS) often occurs after a gastrointestinal infection with E coli bacteria (Escherichia coli O157:H7). However, the condition has also been linked to other gastrointestinal infections, including shigella and salmonella. It has also been linked to nongastrointestinal infections.
HUS is most common in children. It is the most common cause of acute kidney failure in children. Several large outbreaks have been linked to undercooked hamburger meat contaminated with E coli.
E coli can be transmitted through:
- Contact from one person to another
- Consuming uncooked food, such as milk products or beef
STEC-HUS is not to be confused with atypical HUS (aHUS) which is not infection-related. It is similar to another disease called thrombotic thrombocytopenic purpura (TTP).
STEC-HUS often begins with vomiting and diarrhea, which may be bloody. Within a week, the person may become weak and irritable. People with this condition may urinate less than normal. Urine output may almost stop.
Red blood cell destruction leads to symptoms of anemia.
Exams and Tests
The health care provider will perform a physical exam. This may show:
- Liver or spleen swelling
- Nervous system changes
Laboratory tests will show signs of hemolytic anemia and acute renal failure. Tests may include:
Treatment may involve:
- Medicines, such as corticosteroids
- Management of fluids and electrolytes
- Transfusions of packed red blood cells and platelets
This is a serious illness in both children and adults, and it can cause death. With proper treatment, more than half of people will recover. The outcome is better in children than adults.
Complications may include:
When to Contact a Medical Professional
Call your provider if you develop symptoms of HUS. Emergency symptoms include:
- Blood in the stool
- No urination
- Reduced alertness (consciousness)
Call your provider if you have had an episode of HUS and your urine output decreases, or you develop other new symptoms.
You can prevent the known cause, E coli, by cooking hamburger and other meats well. You should also avoid contact with unclean water and follow proper hand washing methods.
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Mele C, Noris M, Remuzzi G. Hemolytic uremic syndrome. In: Ronco C, Bellomo R, Kellum JA, Ricci Z, eds. Critical Care Nephrology. 3rd ed. Philadelphia, PA: Elsevier; 2019:chap 50.
Schneidewend R, Epperla N, Friedman KD. Thrombotic thrombocytopenic purpura and the hemolytic uremic syndromes. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 7th ed. Philadelphia, PA: Elsevier; 2018:chap 134.