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Abstract

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The cerebroprotective effects of mild to moderate hypothermia(about 32¡É) in brain
ischemia have been well established. Taking into consideration of potential deleterious
systemic effects of total body cooling, selective brain cooling(SBC) can be considered as
an alternative mean, and recently the protective effects of SBC in focal cerebral
ischemia have been reported. However, there has been no attempt to draw a comparison
of antiischemic and systemic effects between systemic hypothermia(SH) and SBC. The
present study investigates the effects of SH and SBC on the physiological variables,
neurological outcome, and the volume of brain infarction and edema, and compares each
other.
In thirty adult male Sprague-Dawley rats weighing 300-400g, permanent middle cereral
artery(MCA) occlusions were performed. Five groups of animals were studied ; group 1,
normothermic control(n=6) ; group 2, systemic hypothermia for 30min(n=6) ; group 3,
selective brain cooling for 60min(n=6) ; group 4, systemic hypothermia groups, active
cooling was performed 15min following MCA occlusion. During the experimental
procedures, the physiological variables such as mean arterial blood pressure and blood
gases were continuously monitored. Twenty-four hours following MCA occlusion, the
rats were sacrificed. Eight predefined coronal sections were stained with
hematoxylin-eosin and the volume of ischemic damage and edema was computed.
The results are as follows :
1) There were no differences in the physiological variables between SH and SBC
groups.
2) In the hypothermia groups, neurological outcome was much better(p<0.05) than that
in the control.
3) The volume of ischemic damage was significantly reduced to 49.2%(p<0.05) in group
4 and 26.7%(p<0.05) in group 5, compared to group 1.
4) Ischemic brain edema was significantly attenuated in group 4(23.6% ; p<0.05) and
group 5(7.8% ; p<0.05), compared to group 1.
These results reveal that systemic hypothermia may exert more beneficial effects upon
focal cerebral infarction without significant systemic complication than selective brain
cooling.

Å°¿öµå

Focal brain infarction; Selective brain cooling; Hypothermia; Neuroprotection; Rat;

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