[Systems analysis of pressure transmission in intracranial cavity].
[Systems analysis of pressure transmission in intracranial cavity].
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颅内压力传递的系统分析[J].
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
H. Nagai
中科院分区：
文献类型：
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作者：
Y. Kasuga;Y. Hasegawa;M. Nitta;H. Nagai
本文对6条犬在正常情况下（正常碳酸血症和颅内压正常）的颅内压脉冲波形进行了系统分析，以探讨压力脉冲如何通过颅内腔传播。起源于心脏的脉搏在颅内通过血管传播，进入脑组织，最终到达硬脑膜表面。可以推测，硬膜外压力脉冲波形可能受到颅内成分性质的影响。颅内腔是由脑实质、血管、脑脊液、血液、软脑膜、蛛网膜、硬脑膜和颅骨等组成的一个系统。采用系统分析方法，以颈总动脉压力脉搏波作为系统的输入信号，硬膜外压力脉搏波作为系统的输出信号。颅内压由硬膜外压力传感器通过顶骨钻孔连接到硬脑膜表面测量。用FM模拟磁带记录颈总动脉压力脉搏波和硬膜外压力脉搏波。通过精确的系统传递函数来评价系统的传输特性。我们认为系统的精确传递函数是由心脏起搏器或主动脉球囊引起的随机输入信号得到的。该方法输入信号的功率谱不像完全随机波（或白色噪声）那样具有平坦的剖面，而是在1 ~ 20 Hz之间有一个平缓的斜率。因此，在我们的方法中的结果可能仅在1 Hz和20 Hz之间的波上是可靠的。（250字处删节）
Systems analysis of intracranial pressure pulse waveform was carried out in 6 dogs during normal condition (normocapnia and intracranial normotension) in order to explore how to transmit the pressure pulse through the intracranial cavity. Pulses originated in the heart travel in the intracranial cavity through the vessels, transmit into the cerebral tissue and finally reach to the dural surface. It can be speculated that the epidural pressure pulse waveform might be influenced by the property of intracranial components. The intracranial cavity which consists of brain parenchyma, vessels, cerebrospinal fluid, blood, pia, arachnoid, dura and skull is considered as a kind of system. The systems analysis method was applied to it. The common carotid arterial pressure pulse wave was used as the input signal of system, and the epidural pressure pulse wave was used as the output. The intracranial pressure was measured by an epidural pressure transducer attached to the dural surface through a parietal burr hole. The common carotid arterial pressure pulse wave and the epidural pressure pulse wave were recorded on FM analog tape. The characteristics of transmission are evaluated by the exact transfer function of system. We consider that the exact transfer function of system is obtained by the randomized input signal caused by the cardiac pacemaker or the aorta balloon. The power spectrum of input signal in this method didn't have a flat profile like completely random wave (or white noise) but a gentle slope between 1 Hz and 20 Hz. Therefore, the result in our method may be reliable only on the waves between 1 Hz and 20 Hz.(ABSTRACT TRUNCATED AT 250 WORDS)