The first hours after a difficult birth can feel like a blur. Parents are suddenly surrounded by unfamiliar medical terms, specialists, and urgent decisions. If your medical team mentions Hypoxic-Ischemic Encephalopathy (HIE) or therapeutic hypothermia, understanding what is happening during these first critical hours can help you ask informed questions and better understand your baby’s care.

As a birth injury lawyer, I have reviewed hundreds of medical records involving HIE and neonatal encephalopathy. While every baby’s story is different, one thing remains consistent: the first several hours after birth are among the most medically significant. They are also some of the most carefully examined when experts later review whether appropriate care was provided.

What Is Hypoxic-Ischemic Encephalopathy (HIE)?

Hypoxic-ischemic encephalopathy (HIE) is a type of brain injury that occurs when a baby’s brain does not receive enough oxygen and blood flow around the time of birth.

Not every baby who experiences oxygen deprivation develops HIE, and not every baby with HIE will qualify for therapeutic hypothermia. Physicians evaluate each newborn individually based on the baby’s clinical condition, neurological examination, laboratory findings, and other objective criteria.

Because brain injury can continue to evolve even after oxygen has been restored, the first several hours following delivery are extremely time-sensitive.

Recognizing the First Signs of HIE

In the minutes following delivery, medical teams carefully evaluate how a newborn is transitioning after birth.

Babies with moderate or severe neonatal encephalopathy may show signs such as:

• Pale or bluish skin color
• Poor muscle tone (limp or floppy)
• Little or no crying immediately after birth
• Difficulty breathing or requiring resuscitation
• Decreased responsiveness
• Early seizures

These findings do not automatically mean a baby has HIE. They can occur for many reasons. However, they are important signs that warrant immediate evaluation because prompt recognition can determine whether a baby qualifies for time-sensitive treatment.

How Doctors Evaluate HIE

Physicians use multiple objective findings together with the baby’s neurological examination to determine whether HIE is likely and whether therapeutic hypothermia should be initiated.

These findings may include:

• Low Apgar scores that remain depressed after birth
• Evidence of neurological dysfunction, including abnormal tone, decreased responsiveness, or seizures
• Umbilical arterial blood gases demonstrating significant metabolic acidosis
• A sentinel event during labor, such as placental abruption, uterine rupture, cord prolapse, or another event associated with significant fetal oxygen deprivation

No single finding establishes the diagnosis. Instead, physicians evaluate the entire clinical picture.

Inside the NICU: What the Medical Team Is Monitoring

During cooling therapy, babies receive continuous monitoring in a Level III or Level IV neonatal intensive care unit (NICU).

Although the equipment can feel overwhelming, each monitor provides important information that helps clinicians respond quickly if the baby’s condition changes.

The medical team is closely monitoring:

Brain Activity

Continuous EEG or amplitude-integrated EEG (aEEG) allows physicians to monitor brain activity and detect seizures, including seizures that may not produce obvious physical movements.

Vital Signs

Heart rate, breathing, blood pressure, oxygen levels, and body temperature are monitored continuously throughout treatment.

Organ Function

A lack of oxygen can affect more than the brain. Physicians also evaluate the kidneys, liver, heart, lungs, and other organ systems while providing supportive care.

Seizures After HIE

Seizures are relatively common in newborns with moderate or severe HIE.

Importantly, not all neonatal seizures are visible. Some produce little or no outward movement, which is why continuous EEG monitoring is often recommended during cooling therapy.

Prompt recognition and treatment of seizures are important components of newborn neurocritical care.

The Rewarming Process

After approximately 72 hours of cooling, babies are slowly returned to a normal body temperature according to NICU protocol.

This is a carefully controlled process that typically occurs over several hours. Medical teams continue monitoring closely because changes in temperature can affect blood pressure, metabolism, and neurological function.

When Is the MRI Performed?

Parents frequently ask when they will learn the extent of their baby’s injury.

A brain MRI is typically performed after the cooling and rewarming process has been completed. MRI findings help physicians understand the location and severity of injury and assist with prognosis and future treatment planning.

While MRI provides valuable information, it is only one part of the overall clinical picture. Doctors also consider the baby’s neurological examinations, EEG findings, clinical progress, and developmental follow-up.

Why These First Hours Matter

For families, these first several hours are filled with uncertainty.

For physicians, they represent a critical period of evaluation and treatment.

For medical experts reviewing a birth injury case, they often become one of the most closely examined parts of the medical record.

Questions that may later be evaluated include:

• Were signs of neonatal encephalopathy recognized promptly?
• Was the baby appropriately evaluated for therapeutic hypothermia?
• If transfer to a higher level of care was needed, did it occur without unnecessary delay?
• Were seizures identified and treated appropriately?
• Was evidence-based neonatal care provided during this critical period?

These questions do not determine whether negligence occurred. Rather, they are part of the careful medical review experts perform when evaluating the care surrounding an HIE diagnosis.

References
● Azzopardi D, et al. (2022). Supporting families in their child’s journey with neonatal encephalopathy and therapeutic hypothermia. Pediatric Research. https://pmc.ncbi.nlm.nih.gov/articles/PMC9627456/

● Higgins RD, Raju T, Edwards AD, et al. (2011). Hypothermia and Other Treatment Options for Neonatal Encephalopathy: An Executive Summary of the Eunice Kennedy Shriver NICHD Workshop. Journal of Pediatrics.
https://www.jpeds.com/article/S0022-3476(11)00786-4/fulltext