Hypoxic ischemic encephalopathy (HIE) is a condition in which the brain does not receive enough oxygen.
HIE can be fatal. Brain cells can begin dying after 4 minutes without oxygen.
There are a variety of causes of HIE. Any injury and many health conditions can cause a lack of oxygen to the brain. Some common causes are:
Any injury, complication, or condition that causes the brain to have a reduction in blood flow and oxygen is a risk factor for HIE.
A physical exam will be done. Typically, the history is the most important factor in making the diagnosis.
Your bodily fluids may need to be tested. This can be done with blood tests.
Images may need to be taken of your bodily structures. This can be done with:
Your heart and brain activity may be tested. This can be done with:
Treatment depends on the underlying cause of the condition, as well as the severity of the damage to the brain. Treatment options include:
In most cases, HIE is sudden and cannot be prevented.
may be given to prevent significant or long-term brain damage after the oxygen supply has been reduced.
Brain Injury Association of America
National Institute of Neurological Disorders and Stroke
Ontario Brain Injury Association
Hypoxic ischemic encephalopathy (HIE). Neurographics website. Available at:
Accessed August 1, 2013.
Itoo BA, Al-Hawsawi ZM, Khan AH. Hypoxic ischemic encephalopathy. Incidence and risk factors in North Western Saudi Arabia.
Saudi Med J. 2003;24(2):147-153.
MacDonald S. Brain injury secondary to carotid intervention.
J Endovasc Ther. 2007;14(2):219-231.
Last reviewed May 2016 by Rimas Lukas, MD
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