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容积压力指数 (PVI)代表颅内的顺应性 ,提供有关颅内容积缓冲能力的信息 ,即PVI值越大 ,颅内缓冲能力越大。PVI的减小先于颅内压的增高。容积压力反应 (VPR)的意义同PVI,虽操作简便 ,但特异性较差。脑脊液流出阻力 (R)增高可能是引起颅内压增高的原因 ,R值在正压性脑积水的鉴别诊断、预后评估中尤其重要。文中就以上参数的概念、正常取值范围、影响因素、测量方法及临床意义作了介绍 ,以期给临床的应用提供参考
Volume pressure index (PVI) represents intracranial compliance, providing information on intracranial volumetric buffering capacity, ie, the greater the PVI, the greater the intracranial buffering capacity. The decrease in PVI precedes the increase in intracranial pressure. Volume pressure response (VPR) with the meaning of PVI, although easy to operate, but less specific. Cerebrospinal fluid outflow resistance (R) increased may lead to increased intracranial pressure, R value in the differential diagnosis of positive pressure hydrocephalus, prognosis is particularly important. The article introduces the concept of the above parameters, the normal range of values, influencing factors, measurement methods and clinical significance, in order to provide a reference for the clinical application