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Prolonged hypothermia in rat: a safety study using brain-selective and systemic treatments
Angela M Auriat1, Ana C Klahr, Gergely Silasi
1Department of Psychology and Center for Neuroscience, University of Alberta , Edmonton, Alberta, Canada .
Therapeutic Hypothermia and Temperature Management
|April 11, 2014
Summary
Prolonged mild hypothermia (32°C) for up to 21 days did not cause brain damage or affect behavior in rats. This suggests extended cooling may be safe for neuroprotection, warranting further research into its effects on brain plasticity.
Area of Science:
- Neuroscience
- Medical Research
Background:
- Hypothermia is a proven neuroprotectant for conditions like cardiac arrest and stroke.
- Optimal parameters for hypothermia treatment (duration, delay, depth) require further investigation.
- Concerns exist regarding potential harm to brain plasticity from extended cooling durations.
Purpose of the Study:
- To evaluate the safety of prolonged systemic and focal hypothermia in a rat model.
- To assess potential detrimental effects of extended cooling on brain structure and function.
- To determine if prolonged mild hypothermia impacts brain plasticity.
Main Methods:
- Systemic hypothermia (32°C) for 3 days in rats undergoing sham stroke surgery.
- Focal brain cooling (∼32°C) of the right hemisphere for 3 or 21 days.
- Assessment of physiological variables, behavioral outcomes, cell morphology, and cell death.
Main Results:
- Three days of systemic hypothermia showed no adverse behavioral or brain damage effects.
- Twenty-one days of focal hypothermia caused minor decreases in heart rate, blood pressure, and core temperature.
- Focal hypothermia did not negatively impact behavior, cell morphology, or cause cell death.
Conclusions:
- Prolonged mild hypothermia (up to 21 days) is safe in normal animal brains.
- Extended cooling does not appear to induce brain damage or impair function in healthy animals.
- Further studies are needed to explore the impact of prolonged hypothermia on brain plasticity following injury.
