Two computerized methods used to analyze intracranial pressure B waves:: comparison with traditional visual interpretation
Two computerized methods used to analyze intracranial pressure B waves:: comparison with traditional visual interpretation
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DOI：
10.3171/jns.2001.94.3.0392
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发表时间：
2001-03-01
影响因子：
4.1
通讯作者：
Malm, J
中科院分区：
文献类型：
--
作者：
Eklund, A;Ågren-Wilsson, A;Malm, J
目的。颅内压 (ICP) 缓慢且有节律的振荡（也称为 B 波）被认为是特发性成人脑积水综合征 (IAHS) 的最佳术前预测因素之一。 B 波的定义差异很大，之前报告的结果必须谨慎对待。本研究的目的是制定 B 波的定义，开发一种使用计算机算法估计 ICP 记录中 B 波内容的方法，并通过与传统的视觉解释进行比较来验证这些程序。在 8 名 IAHS 患者中，持续监测 ICP 约 20 小时。 ICP B 波活动占总监测时间的百分比 (B%) 是通过根据 Lundberg 给出的定义使用视觉估计以及使用两种计算机算法（方法 I 和 TI）来估计的。在方法I中，每个单独的波被分类为是否为B波，而方法II用于通过评估TCP记录的10分钟块中的B波功率来估计B波内容。结论。这两种计算机算法产生了相似的结果。然而，当振幅设置为 1 mm Hg 时，方法 I 与视觉分析的相关性最高 (r = 0.74)。过夜 ICP 记录中 B% 的可接受近似值需要至少 5 小时的监测时间。使用现代技术分析 ICP B 波含量的优势是显而易见的，这些方法应该在未来的研究中使用。
Object. Slow and rhythmic oscillations in intracranial pressure (ICP), also known as B waves, have been claimed to be one of the best preoperative predictive factors in idiopathic adult hydrocephalus syndrome (IAHS). Definitions of B waves vary widely, and previously reported results must be treated with caution. The aims of the present study were to develop a definition of B waves, to develop a method to estimate the B-wave content in an ICP recording by using computer algorithms, and to validate these procedures by comparison with the traditional visual interpretation.Methods. In eight patients with IAHS,ICP was continuously monitored for approximately 20 hours. The ICP B-wave activity as a percentage of total monitoring time (B%) was estimated by using visual estimation according to the definition given by Lundberg, and also by using two computer algorithms (Methods I and TI). In Method I each individual wave was classified as a B wave or not, whereas Method Il was used to estimate the B-wave content by evaluating the B-wave power in 10-minute blocks of TCP recordings.Conclusions. The two computerized algorithms produced similar results. However, with the amplitude set to 1 mm Hg, Method I yielded the highest correlation with the visual analysis (r = 0.74). At least 5 hours of monitoring time was needed for an acceptable approximation of the B % in an overnight ICP recording. The advantages of using modern technology in the analysis of B-wave content of ICP are obvious and these methods should be used in future studies.