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Effective selective head cooling during posthypoxic hypothermia in newborn piglets.

M Thoresen1, M Simmonds, S Satas

  • 1Department of Child Health, St. Michael's Hospital, Level D, Southwell Street, University of Bristol, Bristol BS2 8EG, U.K. marianne.thoresen@bristol.ac.uk

Pediatric Research
|March 27, 2001
PubMed
Summary

Selective head cooling effectively cools the brain below core body temperature in a piglet model of hypoxia-ischemia. This neuroprotective strategy minimizes systemic hypothermia, validating its use in newborns.

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Area of Science:

  • Neuroscience
  • Neonatal Research
  • Medical Interventions

Background:

  • Selective head cooling (SHC) is a neuroprotective strategy for neonatal hypoxia-ischemia (HI).
  • SHC aims to cool the brain without systemic hypothermia, minimizing adverse effects.
  • Limited data exist on achieving greater brain cooling than core body cooling.

Purpose of the Study:

  • To investigate the feasibility of selective head cooling in a piglet model of HI.
  • To directly measure intracerebral temperatures during SHC.
  • To assess the impact of HI insult on SHC effectiveness.

Main Methods:

  • Nine anesthetized piglets underwent SHC using a cold-water-perfused cap.
  • Brain (surface, superficial, deep gray matter) and core body (rectal) temperatures were continuously monitored.

Related Experiment Videos

  • Overhead body heating was employed during SHC.

    • Main Results:

    • Selective head cooling achieved lower deep brain temperatures than rectal temperatures in all piglets.
    • This gradient was significantly reduced after the HI insult (p = 0.008).
    • The temperature gradient was maintained during rewarming.

    Conclusions:

    • Direct measurement validates the cooling cap as effective for selective brain cooling in a neonatal HI model.
    • SHC is feasible and can achieve differential brain cooling.
    • The HI insult impacts the effectiveness of SHC's differential cooling.