Explain the criteria and purpose of therapeutic hypothermia in neonatal care and the typical target parameters.

• A. Preterm infants with mild asphyxia; cool to 37°C for 6 hours.
• B. Eligible term or near-term infants with moderate to severe hypoxic-ischemic encephalopathy within 6 hours of birth; cool to about 33.5°C for 72 hours, then gradual rewarming.
• C. Term infants with mild HIE; cool to 34.5°C for 24 hours.
• D. Any neonate with respiratory distress; cool to 30°C for 24 hours.

Answer: (B)

Therapeutic hypothermia is used to limit brain injury after a hypoxic-ischemic insult by slowing the brain’s injury cascade. Cooling lowers metabolic demand and helps reduce secondary energy failure, excitotoxicity, inflammation, and cell death, which can translate into better neurodevelopmental outcomes when started early.

Criteria and purpose: This intervention is for term or near-term infants (roughly 36 weeks gestation or more) who show moderate to severe hypoxic-ischemic encephalopathy within about six hours of birth. The goal is to initiate cooling within that window because the benefit is greatest when begun early, before extensive secondary injury has occurred. The cooling is not intended for preterm infants, mild HIE, or infants with births complicated by conditions where cooling is contraindicated.

Typical target parameters: The standard approach is to cool the infant to about 33.5°C for roughly 72 hours, then rewarm gradually. Rewarming is done slowly to avoid physiologic instability, commonly at a rate around 0.5°C per hour until normothermia is reached. Throughout, the infant is closely monitored with temperature, cardiovascular status, ventilation, and neurologic monitoring.

In short, this therapy is chosen for term or near-term infants with moderate to severe HIE within 6 hours of birth, aiming for around 33.5°C for three days, followed by careful, gradual rewarming to support better neurological outcomes.