Rewarmed Neonatal Encephalopathy With Subtle Movements
A 39-week-gestation boy is delivered by emergency cesarean for placental abruption. Apgar scores are 2, 5, and 6 at 1, 5, and 10 minutes. Cord pH is 6.85 with base deficit 18 mmol/L. He is intubated at 8 minutes and receives chest compressions for 4 minutes. Passive cooling is started at 4.5 hours of life, and therapeutic hypothermia at 33.5°C is maintained for 72 hours. He is now 96 hours old, rewarmed, and lethargic with poor suck. He has intermittent lip smacking and bicycling movements. Amplitude-integrated EEG shows a burst-suppression pattern. Lactate is 8 mmol/L, creatinine 1.1 mg/dL, urine output 0.5 mL/kg/h, and platelets 80,000/µL. He is on caffeine and has not fed enterally.
1. The bedside nurse asks whether the lip smacking and bicycling movements require immediate antiseizure medication. How do you decide, and what monitoring do you order?
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The movements are concerning but not automatically epileptic. In a rewarmed infant with hypoxic-ischemic encephalopathy, lip smacking and bicycling can be brainstem-release phenomena, cortical seizures, or both. The amplitude-integrated EEG is useful for background but has limited spatial coverage and can miss brief or focal seizures. I would order conventional video-EEG monitoring urgently, check glucose and electrolytes, and review medication exposure. If electrographic seizures are captured, I would treat with phenobarbital 20 mg/kg IV as first-line, with a second load of 10 mg/kg if seizures persist, then consider levetiracetam or phenytoin. If no electrographic seizures are seen but clinical events continue, I would not escalate blindly; I would treat the background encephalopathy and reassess. The burst-suppression pattern itself is not an indication for antiseizure medication unless seizures are documented.
2. At what age should MRI be obtained, and which findings would most influence prognosis and discussions about gastrostomy?
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Conventional MRI is best obtained at 72 to 96 hours of life, or after rewarming on day 4 to 5. Early diffusion-weighted imaging can be falsely reassuring in the first 24 hours and may pseudonormalize later, so timing matters. The most prognostic findings are bilateral basal ganglia and thalamic injury, brainstem involvement, and extensive watershed injury. Severe basal ganglia/thalamic damage predicts cerebral palsy, especially dyskinetic patterns, and persistent oral-motor dysfunction. However, MRI is only one data point. Gastrostomy discussions should wait until swallowing has been assessed repeatedly over weeks to months; many infants with poor suck at day 4 improve. I would use MRI to guide early intervention and feeding support, not to make an irreversible prognosis at 96 hours.
3. The family asks whether cooling can be restarted because he seems worse. How do you respond?
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I would explain that therapeutic hypothermia is time-sensitive and was completed within the evidence-based window. Rewarming has already occurred, and restarting cooling after 96 hours is not supported; it risks bradycardia, coagulopathy, impaired perfusion, and infection without proven benefit. The apparent worsening may reflect evolving cerebral edema, seizures, metabolic derangement, or infection. I would instead focus on controlled normothermia, seizure detection and treatment, glucose and electrolyte management, careful fluid balance, nutrition, and early developmental therapy. I would also obtain the MRI and EEG data before giving a prognosis. The family should hear that the goal now is preventing secondary injury and supporting recovery, not repeating a therapy whose window has closed.