Effects of hypothermia on traumatic brain injury in immature rats

被引:56
作者
Mansfield, RT
Schiding, JK
Hamilton, RL
Kochanek, PM
机构
[1] UNIV PITTSBURGH, SAFAR CTR RESUSCITAT RES, PITTSBURGH, PA 15260 USA
[2] UNIV PITTSBURGH, DEPT ANESTHESIOL & CRIT CARE MED, PITTSBURGH, PA 15260 USA
[3] UNIV PITTSBURGH, DEPT PEDIAT, PITTSBURGH, PA 15260 USA
[4] UNIV PITTSBURGH, DEPT PATHOL, PITTSBURGH, PA 15260 USA
关键词
edema; head injury; hypothermia; immature rat; traumatic brain injury;
D O I
10.1097/00004647-199603000-00009
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Hypothermia is beneficial in adult models of traumatic brain injury (TBI), but it has not been evaluated in an immature animal model. We hypothesized that brief hypothermia applied after TBI would reduce cerebral edema and lesion volume in immature rats. Male Wistar rats (3-4 weeks of age, 90-140 g) were anesthetized, intubated, mechanically ventilated, and subjected to TBI by a weight drop onto the exposed right parietal cortex. Hypothermic rats were then cooled to a brain temperature of 32.0 +/- 0.5 degrees C for 4 h, and control rats were maintained at a brain temperature of 37.0 +/- 0.5 degrees C. Cerebral edema(wet - dry weight method) was assessed at 4 and 24 h, and lesion volume was assessed at 5 days, At 4 h, a reduction of percent brain water in the traumatized hemisphere was observed in hypothermic versus normothermic rats (81.75 +/- 0.60 vs. 82.53 +/- 0.67%; p < 0.05), but by 24 h posttrauma, the groups were similar (p = 0.82). Total lesion volume (47.2 +/- 8.5 vs. 44.4 +/- 10.0 mm(3); p = 0.51) and necrotic volume (20.2 +/- 6.3 vs. 20.0 +/- 7.9 mm(3); p = 0.95) were similar in the hypothermic and normothermic groups. We conclude that in this model, a transient (4-h) application of moderate (32 degrees C) hypothermia reduces the cerebral edema characteristically seen in immature rats at 4 h, but this reduction is not sustained at 24 h. Attenuating or delaying the development of cerebral edema could have important therapeutic relevance after TBI. Transient hypothermia, however, did not reduce lesion volume at 5 days posttrauma.
引用
收藏
页码:244 / 252
页数:9
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