Distortion of the Intracranial Pressure Waveform by Extraventricular Drainage System.

Objective: To investigate whether intracranial pressure (ICP) waveform measurements obtained from extraventricular drainage (EVD) systems are suitable for the calculation of intracranial elastance (ICE) or cerebrovascular pressure autoregulation (PAR) indices. Methods: The transfer characteristic of an EVD system is investigated by its step and frequency responses with focus on the low frequency (...