|New on the MedlinePlus Kidney Diseases page:|
08/08/2016 12:49 PM EDT
Source: National Institute of Diabetes and Digestive and Kidney Diseases -
08/02/2016 11:30 PM EDT
Source: National Library of Medicine -
Hemolytic Uremic Syndrome in Children
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What is hemolytic uremic syndrome?
Hemolytic uremic syndrome, or HUS, is a kidney condition that happens when red blood cells are destroyed and block the kidneys' filtering system. Red blood cells contain hemoglobin—an iron-rich protein that gives blood its red color and carries oxygen from the lungs to all parts of the body.When the kidneys and glomeruli—the tiny units within the kidneys where blood is filtered—become clogged with the damaged red blood cells, they are unable to do their jobs. If the kidneys stop functioning, a child can develop acute kidney injury—the sudden and temporary loss of kidney function. Hemolytic uremic syndrome is the most common cause of acute kidney injury in children.
What are the kidneys and what do they do?
The kidneys are two bean-shaped organs, each about the size of a fist. They are located just below the rib cage, one on each side of the spine. Every day, the two kidneys filter about 120 to 150 quarts of blood to produce about 1 to 2 quarts of urine, composed of wastes and extra fluid. Children produce less urine than adults and the amount produced depends on their age. The urine flows from the kidneys to the bladder through tubes called ureters. The bladder stores urine. When the bladder empties, urine flows out of the body through a tube called the urethra, located at the bottom of the bladder.
What causes hemolytic uremic syndrome in children?
The most common cause of hemolytic uremic syndrome in children is an Escherichia coli (E. coli) infection of the digestive system. The digestive system is made up of the gastrointestinal, or GI, tract—a series of hollow organs joined in a long, twisting tube from the mouth to the anus—and other organs that help the body break down and absorb food.Normally, harmless strains, or types, of E. coli are found in the intestines and are an important part of digestion. However, if a child becomes infected with the O157:H7 strain of E. coli, the bacteria will lodge in the digestive tract and produce toxins that can enter the bloodstream. The toxins travel through the bloodstream and can destroy the red blood cells. E.coli O157:H7 can be found in
Which children are more likely to develop hemolytic uremic syndrome?
Children who are more likely to develop hemolytic uremic syndrome include those who
What are the signs and symptoms of hemolytic uremic syndrome in children?
A child with hemolytic uremic syndrome may develop signs and symptoms similar to those seen with gastroenteritis—an inflammation of the lining of the stomach, small intestine, and large intestine— such as
Signs and symptoms of anemia may include
Other signs and symptoms of hemolytic uremic syndrome may include bruising and seizures.
When hemolytic uremic syndrome causes acute kidney injury, a child may have the following signs and symptoms:
How is hemolytic uremic syndrome in children diagnosed?
A health care provider diagnoses hemolytic uremic syndrome with
Medical and Family History
Taking a medical and family history is one of the first things a health care provider may do to help diagnose hemolytic uremic syndrome.
A physical exam may help diagnose hemolytic uremic syndrome. During a physical exam, a health care provider most often
A health care provider may order the following urine tests to help determine if a child has kidney damage from hemolytic uremic syndrome.Dipstick test for albumin. A dipstick test performed on a urine sample can detect the presence of albumin in the urine, which could mean kidney damage. The child or caretaker collects a urine sample in a special container in a health care provider's office or a commercial facility. For the test, a nurse or technician places a strip of chemically treated paper, called a dipstick, into the child's urine sample. Patches on the dipstick change color when albumin is present in the urine.
Urine albumin-to-creatinine ratio. A health care provider uses this measurement to estimate the amount of albumin passed into the urine over a 24-hour period. The child provides a urine sample during an appointment with the health care provider. Creatinine is a waste product that is filtered in the kidneys and passed in the urine. A high urine albumin-to-creatinine ratio indicates that the kidneys are leaking large amounts of albumin into the urine.
A blood test involves drawing blood at a health care provider's office or a commercial facility and sending the sample to a lab for analysis. A health care provider will test the blood sample to
A stool test is the analysis of a sample of stool. The health care provider will give the child's parent or caretaker a container for catching and storing the stool. The parent or caretaker returns the sample to the health care provider or a commercial facility that will send the sample to a lab for analysis. Stool tests can show the presence of E. coli O157:H7.
Biopsy is a procedure that involves taking a small piece of kidney tissue for examination with a microscope. A health care provider performs the biopsy in an outpatient center or a hospital. The health care provider will give the child light sedation and local anesthetic; however, in some cases, the child will require general anesthesia. A pathologist—a doctor who specializes in diagnosing diseases—examines the tissue in a lab. The pathologist looks for signs of kidney disease and infection. The test can help diagnose hemolytic uremic syndrome.[Top]
What are the complications of hemolytic uremic syndrome in children?
Most children who develop hemolytic uremic syndrome and its complications recover without permanent damage to their health.1However, children with hemolytic uremic syndrome may have serious and sometimes life-threatening complications, including
How is hemolytic uremic syndrome in children treated?
A health care provider will treat a child with hemolytic uremic syndrome by addressing
Treating Urgent Symptoms and Preventing Complications
A health care provider will treat a child's urgent symptoms and try to prevent complications by
Treating Acute Kidney Injury
If necessary, a health care provider will treat acute kidney injury with dialysis—the process of filtering wastes and extra fluid from the body with an artificial kidney. The two forms of dialysis are hemodialysis and peritoneal dialysis. Most children with acute kidney injury need dialysis for a short time only.
Treating Chronic Kidney Disease
Some children may sustain significant kidney damage that slowly develops into CKD. Children who develop CKD must receive treatment to replace the work the kidneys do. The two types of treatment are dialysis and transplantation.In most cases, health care providers treat CKD with a kidney transplant. A kidney transplant is surgery to place a healthy kidney from someone who has just died or a living donor, most often a family member, into a person's body to take over the job of the failing kidney. Though some children receive a kidney transplant before their kidneys fail completely, many children begin with dialysis to stay healthy until they can have a transplant.
More information is provided in the NIDDK health topic, Treatment Methods for Kidney Failure in Children.
How can hemolytic uremic syndrome in children be prevented?
Parents and caregivers can help prevent childhood hemolytic uremic syndrome due to E. coli O157:H7 by
Eating, Diet, and Nutrition
At the beginning of the illness, children with hemolytic uremic syndrome may need IV nutrition or supplements to help maintain fluid balance in the body. Some children may need to follow a low-salt diet to help prevent swelling and high blood pressure.Health care providers will encourage children with hemolytic uremic syndrome to eat when they are hungry. Most children who completely recover and do not have permanent kidney damage can return to their usual diet.
Points to Remember
National Kidney FoundationFamily Focus newsletter
Children with Chronic Kidney Disease: Tips for Parents
Nemours KidsHealth Website
When Your Child Has a Chronic Kidney Disease
What's the Deal With Dialysis?
United Network for Organ Sharing
Organ Transplants: What Every Kid Needs to Know
U.S. Department of Health and Human Services, Centers for Medicare & Medicaid Services
Medicare Coverage of Kidney Dialysis & Kidney Transplant Services
U.S. Social Security Administration
Benefits For Children With Disabilities
The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and other components of the National Institutes of Health (NIH) conduct and support research into many diseases and conditions.What are clinical trials, and are they right for you?
Clinical trials are part of clinical research and at the heart of all medical advances. Clinical trials look at new ways to prevent, detect, or treat disease. Researchers also use clinical trials to look at other aspects of care, such as improving the quality of life for people with chronic illnesses. Find out if clinical trials are right for you.
What clinical trials are open?
Clinical trials that are currently open and are recruiting can be viewed at www.ClinicalTrials.gov.
This content is provided as a service of the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), part of the National Institutes of Health. The NIDDK translates and disseminates research findings through its clearinghouses and education programs to increase knowledge and understanding about health and disease among patients, health professionals, and the public. Content produced by the NIDDK is carefully reviewed by NIDDK scientists and other experts.
The NIDDK would like to thank:
Barbara Fivush, M.D., and Kathy Jabs, M.D., of the American Society of Pediatric Nephrology (ASPN); Tej Mattoo, M.D.; William Primack, M.D.; Joseph Flynn, M.D.; Ira Davis, M.D.; Ann Guillott, M.D.; Steve Alexander, M.D.; Deborah Kees-Folts, M.D.; Alicia Neu, M.D.; Steve Wassner, M.D.; John Brandt, M.D.; and Manju Chandra, M.D., all members of the ASPN's Clinical Affairs Committee. Frederick Kaskel, M.D., Ph.D., ASPN; Sharon Andreoli, M.D., ASPN
This information is not copyrighted. The NIDDK encourages people to share this content freely.
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