Hypoxic-Ischemic Encephalopathy (HIE)

Hypoxic-ischemic encephalopathy is a severe and permanent neonatal brain injury. HIE is caused by oxygen deprivation and/or limited blood flow to the brain at or near the time of birth. When this happens, brain cells die off in a cascade reaction, causing widespread brain damage. Hypoxic-ischemic encephalopathy is preventable in the vast majority of cases. Currently, hypothermia treatment is the only known treatment for HIE. Doctors may limit the long-term damage caused by HIE by performing hypothermia treatment, which is also known as ‘therapeutic hypothermia’ or ‘body cooling’. If doctors suspect that a baby has HIE, it is mandatory that they provide hypothermia treatment. Other terms for hypoxic-ischemic encephalopathy include perinatal asphyxia, birth asphyxia, intrapartum asphyxia, and neonatal encephalopathy.


What Is Hypoxic-Ischemic Encephalopathy (HIE)?

(HIE) Hypoxic Ischemic Encephalopathy Definition | Infographic

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Hypoxic-ischemic encephalopathy is a newborn brain injury caused by oxygen deprivation to the brain around the time of delivery. HIE is estimated to occur in about two to nine per 1,000 live births, making it the most common type of neonatal encephalopathy (NE). Neonatal encephalopathy is a broad term used to describe any disturbed neurological function in a newborn baby.

Roughly 10 to 60 percent of babies with HIE die in the newborn period. At least 25 percent of babies with HIE that survive go on to live with significant brain damage and long-term neurodevelopmental impairments.

Lack of oxygen and subsequent cell death (brain damage) can result in mental and physical disabilities such as intellectual and developmental disabilities, learning disabilities, cerebral palsy (CP) and seizures.

For babies with HIE, the seriousness of the brain damage depend on the following conditions:

  • The severity of the oxygen deprivation
  • The length of time that the baby was deprived of oxygen
  • The condition of the baby prior to the oxygen deprivation
  • The medical management of the baby by the medical team after the oxygen-depriving event occurred

Generally speaking, the longer an infant goes without oxygen or with decreased oxygen, the more severe and permanent the injury will be.


Visualizing HIE and Neonatal Brain Injury

HIE and Diminished Blood Flow

Hypoxic Ischemic Encephalopathy (HIE), Birth Asphyxia, Neonatal Encephalopathy

Terms and Definitions for HIE

Understanding HIE - Hypoxic Ischemic Encephalopathy Core Terms - Infographic


Causes of Hypoxic-Ischemic Encephalopathy (HIE) and Birth Asphyxia

A number of complications and medical mistakes can cause hypoxic-ischemic encephalopathy. Causes of hypoxic-ischemic encephalopathy include:


Signs and Symptoms of Hypoxic-Ischemic Encephalopathy

Signs of hypoxic-ischemic encephalopathy (HIE) at birth may include the following:

  • Resuscitation of the newborn at birth
  • Low APGAR Scores for longer than 5 minutes. An APGAR score assesses the overall health of a newborn over the first few minutes of life. It assigns scores to conditions such as the baby’s skin color and complexion, pulse rate, reflexes, muscle tone and breathing.
  • Seizures within the first 24 to 48 hours after delivery
  • Difficulty feeding, including inability to latch, suck or swallow
  • Profound metabolic or mixed acidemia in an umbilical artery blood sample (the baby’s blood is acidic/has a low ph)
  • Hypotonia (low muscle tone)
  • Abnormal limpness
  • Multiple organ problems (e.g., involvement of the lungs, liver, heart, intestines)
  • No brain stem reflexes (e.g., breathing problems and an abnormal response to light, and only blood pressure and heart function reflexes are functioning)
  • Coma

Diagnosing Hypoxic-Ischemic Encephalopathy

Hypoxic-ischemic encephalopathy is confirmed through tests and neuroimaging studies, including the following:

  • CT scans
  • PET scans
  • MRIs
  • Blood glucose tests
  • Arterial blood gas tests
  • EEGs
  • Ultrasounds

In order to perform these tests, doctors must first suspect that a hypoxic-ischemic event occurred. If delivery was traumatic, oxygen-depriving complications occurred, or signs for HIE are present in the baby, medical professionals should begin the diagnostic process. Sometimes, however, signs of brain damage and HIE may not appear until later when a child exhibits impaired motor function, delayed growth and delayed developmental milestones.


Treatment for Hypoxic-Ischemic Encephalopathy (Birth Asphyxia)

HIE Treatment Before the Advent of Hypothermia Therapy

Traditionally, babies with HIE have been treated with supportive care to limit brain damage and prevent further injury. Specifically, HIE treatment has included conventional measures such as ventilation, NICU care, controlling or preventing seizures, maintaining blood glucose and blood pressure, minimizing cerebral swelling and receiving care from specialty physicians.

Treating HIE Today: Hypothermia Therapy  (Brain Cooling)

Recently, a new treatment for HIE called hypothermia treatment (also known as brain cooling) has been introduced specifically for the treatment of hypoxic-ischemic encephalopathy. Hypothermia treatment has shown promising results in improving the outcome of babies with birth-associated HIE by reducing the severity of neurological injury.

The treatment consists of lowering a newborn’s body temperature to around 91 degrees Fahrenheit for a period of about 72 hours. Lowering the baby’s temperature slows the metabolic rate, allowing cells to recover over a longer period of time. This avoids further damage that can occur if normal oxygenation or blood flow is restored too quickly to injured cells. Once hypoxic-ischemic encephalopathy is diagnosed, it is critical that hypothermia treatment begins, as long as all indications for the treatment are met. Failure to perform hypothermia treatment on a newborn baby who is eligible and in need of the treatment is an instance of medical malpractice.

Therapeutic Hypothermia - Body Cooling for Babies with Hypoxic-Ischemic Encephalopathy (HIE)


How Do You Pronounce Hypoxic-Ischemic Encephalopathy?


Video: Our Michigan Hypoxic-Ischemic Encephalopathy Lawyers Discuss HIE

In this video, hypoxic-ischemic encephalopathy lawyers Jesse Reiter and Rebecca Walsh discuss the causes of and treatments for HIE.  Negligence by the medical team is often the cause of HIE and birth asphyxia.


Hypoxic-Ischemic Encephalopathy Lawyers | Legal Help for Children with HIE and Birth Injuries

Hypoxic-Ischemic Encephalopathy Lawyers | Reiter & Walsh, PCHIE cases require specific, extensive knowledge of both law and medicine. For the best case outcomes, it’s critical to find an attorney and a law firm that focus specifically on hypoxic-ischemic encephalopathy cases. At Reiter & Walsh, P.C., our hypoxic-ischemic encephalopathy lawyers have been focusing their careers on birth injury and HIE cases, and they consistently secure multi-million dollar settlements for their clients.

Reiter & Walsh ABC Law Centers is based in Michigan, but we handle cases throughout the United States. For instance, we handle hypoxic-ischemic encephalopathy cases in Michigan, Ohio, Washington D.C., Pennsylvania, Tennessee, Arkansas, Mississippi, Texas, Wisconsin, and all other states in the United States. Our birth injury team is also equipped to handle cases involving military medical malpractice and federally funded clinics.

Contact Reiter & Walsh, P.C. today to begin your free case review with our Detroit, Michigan hypoxic-ischemic encephalopathy lawyers. Free of charge and obligations, we will answer your legal questions, determine the negligent party and inform you of your legal options. Our team is available to speak with you to set up an appointment in any of the following ways:

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Related Reading from Our Hypoxic-Ischemic Encephalopathy Lawyers


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