Therapeutic hypothermia can be induced and maintained using either commercial water bottles or a "phase changing material'' mattress in a newborn piglet model

• Background: Therapeutic hypothermia, a safe and effective treatment for neonatal encephalopathy in an intensive care setting, is not available in low-resource settings. Aims/Methods: To assess two low-tech, low-cost cooling devices for use in low-resource settings: (i) commercially available water bottles filled with tepid water (25 degrees C); (ii) a mattress made of phase changing material (PCM) with a melting point of 32 degrees C (PCM works as a heat buffer at this temperature). Eleven anaesthetised newborn piglets were studied following transient hypoxia-ischaemia. The cooling device was applied 2-26 h after hypoxia-ischaemia with a target rectal temperature (T-rectal) of 33-34 degrees C. T-rectal undershoot was adjusted using cotton blankets; the cooling device was renewed when T-rectal rose above 35 degrees C. T-rectal data during cooling were dichotomised (within or without target) to assess: (a) the total period within the target T-rectal range; (b) the stability and fluctuation of T-rectal during cooling. Results: Therapeutic hypothermia was achieved with both water bottles (n=5) and the PCM mattress (n=6). The mean (SD) time to reach target T-rectal was 1.8 (0.5) h with water bottles and 1.9 (0.3) h with PCM. PCM cooling led to a longer period within the target T-rectal range (p<0.01) and more stable cooling (p<0.05). Water bottle cooling required device renewal (in four out of five piglets). Conclusion: Simple, low-tech cooling devices can induce and maintain therapeutic hypothermia effectively in a porcine model of neonatal encephalopathy, although frequent fine tuning by adjusting the number of blankets insulating the piglet was required to maintain a stable temperature. PCM may induce more stable cooling compared with water bottles.

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