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Brain temperature in newborn piglets under selective head cooling with minimal systemic hypothermia
Osuke Iwata1, Sachiko Iwata, Masanori Tamura
1Division of Neonatology, Perinatal Center, Nagano Children's Hospital, Toyoshina, Nagano, Japan. o.iwata@orbix.uk.net
Summary
Selective head cooling can achieve moderate brain hypothermia in newborns without systemic hypothermia. Scalp and nasopharyngeal temperatures predict brain cooling, enabling safe therapeutic application.
Area of Science:
- Neonatal Medicine
- Neuroscience
- Thermoregulation
Background:
- Selective brain hypothermia shows promise for neuroprotection in newborns.
- The precise thermal distribution during selective head cooling requires further investigation.
Purpose of the Study:
- To investigate the mechanism of selective head cooling in newborn piglets.
- To determine optimal conditions for achieving moderate brain hypothermia without systemic hypothermia.
Main Methods:
- Seven newborn piglets underwent selective head cooling with varying coolant temperatures (-20°C to 15°C).
- Temperatures were monitored at superficial and deep brain, scalp, nasopharynx, tympanum, esophagus, and rectum.
- Target deep brain temperature was set at 35°C.
Main Results:
- Cooling to 35°C deep brain temperature with 0°C coolant caused scalp injury.
- Minimal systemic hypothermia (1°C rectal decrease) with 10°C coolant achieved target brain temperature without scalp injury.
- Scalp skin and nasopharyngeal temperatures effectively predicted brain temperatures.
Conclusions:
- Moderate brain hypothermia can be achieved in newborn infants without inducing moderate systemic hypothermia.
- Scalp and nasopharyngeal temperature monitoring is crucial for safe and effective selective head cooling.