When a newborn has signs of hypoxic-ischemic encephalopathy (HIE) — brain injury from oxygen deprivation around the time of birth — there is one treatment that has been shown to improve outcomes: therapeutic hypothermia, also called whole-body or selective head cooling. The treatment is time-sensitive, the eligibility criteria are specific, and the standard of care for U.S. NICUs has been clear for more than a decade. When eligible babies do not receive cooling, the missed treatment is often the central issue in the malpractice case.
This guide walks through what cooling is, who qualifies, the time window that matters, and why missed cooling shows up so often in birth injury litigation.
What Therapeutic Hypothermia Is
Therapeutic hypothermia is the controlled lowering of the baby's core body temperature to approximately 33.5°C (92.3°F) for 72 hours, followed by gradual rewarming. The cooling is delivered either by a whole-body cooling blanket that wraps the entire baby, or by a selective head cooling cap (less commonly used today). The babies are monitored continuously in the NICU during the treatment.
The biology: when the brain has been deprived of oxygen, there is an initial period of cell injury followed by a delayed wave of secondary cell death called the "reperfusion injury" that unfolds over hours to days. Cooling slows the metabolic processes that drive that secondary wave, giving more brain cells a chance to recover. The effect on long-term outcomes has been demonstrated in multiple randomized controlled trials.
Who Qualifies for Cooling
The standard cooling protocols, derived from the major trials (CoolCap, NICHD, TOBY), require all of the following:
- Gestational age ≥36 weeks and birth weight ≥1800-2000 grams.
- Evidence of perinatal asphyxia: pH ≤7.0 or base deficit ≥16 on cord blood or first-hour blood gas; OR a 10-minute APGAR score ≤5; OR the need for resuscitation beyond 10 minutes of life.
- Evidence of moderate or severe encephalopathy on neurologic exam (often using the modified Sarnat staging) — abnormal level of consciousness, abnormal tone, abnormal reflexes, seizures, or abnormal autonomic findings.
- Cooling initiated within 6 hours of birth.
Babies who meet these criteria should be cooled. The decision to cool is sometimes made at the delivering hospital, but more often the baby is transferred to a regional cooling center if the delivery hospital does not have a cooling program. Most U.S. tertiary NICUs maintain cooling capability and accept transfers around the clock.
The 6-Hour Window
The most important number in cooling care is six hours. The treatment effect of cooling drops sharply if it is not initiated within six hours of birth. Beyond that window, the secondary wave of brain injury is already well underway, and the benefit of cooling diminishes.
That window puts pressure on the chain of decisions in the first hours of life:
- Did the delivery team recognize that the baby's exam was consistent with HIE?
- Was a cord blood gas drawn and run in time to identify perinatal asphyxia?
- Was the neonatologist or pediatrician called to evaluate?
- Was cooling started locally, or was the baby promptly transferred to a cooling center?
- If transfer was required, was the receiving hospital notified, the transport team activated, and the baby moved fast enough to start cooling inside the window?
Why missed cooling matters legally. When a baby meets the cooling criteria but is not cooled within the 6-hour window, the case has a specific medical-legal anchor: the lost opportunity for a treatment that has documented benefit. Expert testimony on damages then focuses on what the cooled outcome would likely have been.
How Cooling Looks in the Chart
If your baby was cooled, the chart should contain:
- The cooling protocol order, with target temperature and duration.
- Continuous esophageal or rectal temperature monitoring.
- The time cooling started (compare to the time of birth to verify the 6-hour window).
- Sarnat staging or equivalent neurological exam documentation.
- Cord blood gas and first-hour blood gas results.
- EEG monitoring during cooling (standard of care at most centers).
- MRI of the brain typically performed after rewarming.
If your baby met cooling criteria but was not cooled, the chart may instead contain documentation of: a decision not to cool, a delay in transfer, a failure to recognize the encephalopathy, or simply silence on the question. Each pattern is its own legal analysis.
What Outcomes Look Like
Cooled babies still have significant rates of long-term neurological problems — cerebral palsy, intellectual disability, epilepsy — but the rates are lower than for babies with comparable HIE who were not cooled. The trials demonstrate reductions in death and major disability in the cooling group versus the standard-care group. Cooling is not a cure; it is a partial protective treatment, and outcomes still depend on the severity of the initial injury.
For families pursuing a case after HIE, the cooling question shapes the damages calculation. If cooling was provided appropriately, the residual disability is what it is, and the case focuses on whether the underlying HIE was preventable. If cooling was missed, the case has an additional layer: not only the original injury, but the missed treatment that could have reduced it.
If Your Baby Had HIE
If your child has been diagnosed with HIE-related cerebral palsy, intellectual disability, or seizure disorder, the labor and delivery records, the neonatal resuscitation record, and the first 24 hours of NICU charting are the documents that drive the legal analysis. A free case review can identify whether the case fits the pattern of a viable claim, whether cooling was missed, and how the deadlines (which differ for minors) apply.
- Read about HIE generally: HIE and birth asphyxia.
- Understand fetal monitoring: Category I, II, III fetal heart rate tracings.
- Understand the deadlines: Birth injury statute of limitations.
- Understand life care plans: What is a life care plan?
Free case review. No Fees Unless We Recover Money for You.
Sources
- American Academy of Pediatrics — "Hypothermia and Neonatal Encephalopathy" clinical report. aap.org
- NIH/NICHD Neonatal Research Network — Whole-body hypothermia for neonates with hypoxic-ischemic encephalopathy (Shankaran et al.). nichd.nih.gov
- Cochrane Database of Systematic Reviews — "Cooling for newborns with hypoxic ischaemic encephalopathy." cochranelibrary.com
- American College of Obstetricians and Gynecologists (ACOG) — "Neonatal Encephalopathy and Neurologic Outcome" task force report. acog.org
- International Liaison Committee on Resuscitation (ILCOR) — Neonatal resuscitation consensus on therapeutic hypothermia. ilcor.org