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创伤性脑水肿的在体研究 |
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刘海鹏 王正国 张可成 尹志勇 谢伯林 刘宝松 朱佩芳 陈海斌
摘 要:目的 探讨在体研究创伤性脑水肿的方法。 方法 选择15个频率点,测量大鼠中度颅脑创伤后伤区组织的电阻抗,分析脑水肿的变化。 结果 伤后早期细胞外液电阻(Re)明显下降,细胞内液电阻(Ri)无明显变化,Re/Ri也明显下降;6 h 后Re略有升高,Ri 明显下降,Re/Ri明显增加;伤后24~72 h脑水肿达高峰,伤后7 d基本恢复。 结论 伤后早期电阻抗的变化提示发生了血管源性脑水肿,伤后6 h电阻抗变化表明细胞内液增多,细胞毒性脑水肿形成。多频率点电阻抗测试可在体反映创伤性脑水肿的发生发展。 关键词:脑水肿,创伤性; 电阻抗
Study on traumatic brain edema in vivo
LIU Haipeng WANG Zhengguo, ZHANG Kecheng, et al. (Dept. of Neurosurgery, Xinqiao Hospital, The Third Military University, Chongqing 400037,China)
Abstract:Objective To explore a method of observing traumatic brain edema in vivo. Methods After a moderate brain trauma in rats, the electrical impedance of the traumatic brain tissue was measured at different 15 frequency pots. The changes of brain edema were then analyzed. Results The resistance of extracellular fluid(Re) and Re/Ri significantly decreased in the early stage of trauma. However, there were no significant changes in resistance of intracellular fluid. Six hours later, Re increased slightly, Ri decreased markedly; and Re/Ri elevated significantly. The brain edema reached a summit of severity 24-72 hours after trauma, and recovered 7 days later. Conclusions In the early period of trauma, the change of the electrical impedance indicated an appearance of vasogenic brain edema. Six hours later, the change showed an increase of extracellular fluid and an occurrence of cytotoxic brain edema. The test of multi-frequency electrical impedance suggested the existence and development of traumatic brain edema in vivo. Key words:Brain edema, traumatic; Electrical impedance▲
交通事故已成为现代社会的一大公害。在交通事故中,颅脑伤的发生率为50%~80%[1]。颅脑创伤是脑水肿的常见原因,脑水肿主要变化为脑实质内液体成分增加,引起脑体积增大[2],是颅脑创伤后继发性脑损害的重要组成部分。动物实验中研究脑水肿的方法主要有干湿重法、特殊比重法等[3-5]。这些方法均不能在体研究脑水肿。而在临床上,常以CT、MRI的影像变化和颅内压(ICP)、脑血流量(CBF)的变化以及临床表现等间接判断脑水肿的发生发展情况,缺乏直接的、无创或微创的研究手段。因此,笔者利用生物组织电阻抗特性在颅脑创伤后的变化,对创伤性脑水肿进行在体研究。
材料与方法
1. 实验动物:Wis[1] [2] 下一页 上一个医学论文: 颅脑损伤后血清垂体前叶激素甲状腺素水平的变化及意义 下一个医学论文: 伸肘位手法复位形石膏夹板固定治疗小儿肱骨髁上伸直型骨折
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