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Related Experiment Video

Updated: Jan 22, 2026

A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy
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Neonatal encephalopathy and hypoxic-ischemic encephalopathy.

Alistair J Gunn1, Marianne Thoresen2

  • 1Departments of Physiology and Paediatrics, University of Auckland, Auckland, New Zealand.

Handbook of Clinical Neurology
|July 21, 2019
PubMed
Summary

Therapeutic hypothermia, initiated early after birth asphyxia, protects the brain during a critical secondary deterioration phase. This neuroprotective strategy significantly improves infant survival and long-term neurodevelopmental outcomes.

Keywords:
Animal modelsApoptosisHypoperfusionHypotensionHypoxic–ischemic encephalopathyNecrosisTherapeutic hypothermiaWindow of opportunity for treatment

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Area of Science:

  • Neonatal neurology
  • Neuroscience
  • Perinatal medicine

Background:

  • Hypoxic-ischemic encephalopathy (HIE) is a leading cause of neonatal mortality and disability.
  • HIE involves an initial insult followed by a latent phase and secondary deterioration.
  • Secondary deterioration is marked by seizures, edema, and metabolic failure.

Purpose of the Study:

  • To evaluate the neuroprotective efficacy of therapeutic hypothermia in neonatal HIE.
  • To determine the optimal timing and duration for hypothermia initiation and maintenance.

Main Methods:

  • Studies focused on the timing of hypothermia relative to the latent phase and secondary deterioration.
  • Randomized controlled trials (RCTs) were the primary evidence base.
  • Outcomes assessed included survival and neurodevelopmental status in infancy and childhood.

Main Results:

  • Early initiation of mild hypothermia before secondary deterioration confers potent, long-lasting neuroprotection.
  • Induced hypothermia significantly improves survival rates in neonates with HIE.
  • RCTs demonstrate improved neurodevelopmental outcomes in infancy and mid-childhood following hypothermia treatment.

Conclusions:

  • Therapeutic mild hypothermia is a highly effective neuroprotective intervention for neonatal hypoxic-ischemic encephalopathy.
  • Early application of hypothermia is crucial for mitigating secondary brain injury and improving long-term outcomes.
  • Evidence from RCTs strongly supports the use of induced hypothermia in clinical practice for HIE.