When an infant’s pancreas releases too much insulin, it is known as congenital hyperinsulinism (CHI). This rare condition presents after a child’s birth. It can result in low blood glucose levels known as hypoglycemia. Low blood glucose levels mean the body does not have enough fuel to function or grow.
The body may compensate for most types of hypoglycemia by releasing more glucose from storage or switching to other fuel sources if they are available. However, CHI blocks these other forms of fuel. If the hypoglycemia is not reversed it can cause problems in the developing brain of infants and children.
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Some forms of CHI are caused by premature birth, lack of oxygen to the brain, diabetes in the mother, or a baby with large birthweight. This is known as transient hyperinsulinism. It will usually pass on its own within 1-2 days.
Other forms of CHI are caused by a specific gene defect. The gene affects cells of the pancreas that detect glucose. This type of CHI tends to be more severe and long term.
Having a family member with CHI increases a child’s risk of having the disorder.
Some symptoms of CHI in newborns may include:
Sometimes symptoms do not appear at birth. Symptoms in children may include:
You will be asked about your child’s symptoms and medical history. A physical exam will be done. CHI can be difficult to catch because insulin levels change constantly. It may be suspected if your child has hypoglycemia even while receiving glucose.
Tests that may help with the diagnosis include:
Genetic testing may be done to find out if your child has the genetic change responsible for CHI. Since there are several forms of CHI, it will also identify which form your child has. Genetic testing can be done through a blood or saliva sample.
For anyone with CHI, controlling episodes of hypoglycemia is the most important step. Each episode of hypoglycemia can not only make your child feel ill but can impact the health of growing organs. The brain in particular is very sensitive to low glucose levels. Regular management may include:
Treatment of CHI itself will depend on the type of CHI your child has. Your child’s CHI may resolve on its own. More severe or permanent types may need surgery for better management or a possible cure.
Talk with your child’s doctor about the best treatment plan for your child. Early treatment will help decrease the risk of complications such as seizures or developmental delays. The earlier treatment is started, the better the outcomes
The pancreas releases insulin. In rare cases of CHI, the pancreas may need to be partially or almost fully removed. This will help to reduce insulin in the body. For some, surgery may be a cure. For others, it may simply decrease the number and severity of hypoglycemia episodes.
There is no known way to prevent CHI.
Congenital Hyperinsulinism International
National Organization for Rare Disorders
Canadian Organization for Rare Disorders
Congenital hyperinsulinism. Children’s Hospital of Philadelphia website. Available at: http://www.chop.edu/conditions-diseases/congenital-hyperinsulinism. Accessed May 8, 2017.
Congenital hyperinsulinism. Congenital Hyperinsulinism International website. Available at: http://congenitalhi.org/congenital-hyperinsulinism/#diagnosis. Accessed May 8, 2017.
Congenital hyperinsulinism. Genetics Home Reference website. Available at: https://ghr.nlm.nih.gov/condition/congenital-hyperinsulinism. Published May 2, 2017. Accessed May 8, 2017.
Congenital hyperinsulinism. National Organization for Rare Disorders website. Available at: https://rarediseases.org/rare-diseases/congenital-hyperinsulinism/#investigational-therapies. Published 2016. Accessed May 8, 2017.
Neonatal hypoglycemia. EBSCO DynaMed Plus website. Available at:http://www.dynamed.com/topics/dmp~AN~T114886/Neonatal-hypoglycemia. Updated March 12, 2017. Accessed June 29, 2017.
Last reviewed September 2017 by EBSCO Medical Review Board Michael Woods, MD, FAAP