在颅内压升高的代偿期内 ,脑脊液体积将出现较大的变化 ,它使脑阻抗发生相应的持续增加。当代偿期结束后 ,颅内压将会随病情发展有明显升高。但颅内容物相对体积变化不大 ,脑阻抗基本沿一基线波动 ,在脑阻抗记录曲线上将会出现一特征性的拐点 ,它是所要观察的重要特征点 In the compensatory period of increased intracranial pressure, cerebrospinal fluid volume will appear larger changes, it makes a corresponding continuous increase in brain impedance. After the current compensation period, intracranial pressure will be significantly increased with the progression of the disease. However, the relative volume of the intracranial contents did not change much, the brain impedance fluctuated along a base line, and a characteristic inflection point appeared in the brain impedance recording curve. It is an important characteristic point to be observed