Distortion of the Intracranial Pressure Waveform by Extraventricular Drainage System
Distortion of the Intracranial Pressure Waveform by Extraventricular Drainage System
复制标题
脑室外引流系统导致颅内压波形畸变
DOI:
10.1109/tbme.2020.3036283
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发表时间:
--
影响因子:
4.6
通讯作者:
T. Heldt
中科院分区:
文献类型:
--
作者:
D. Teichmann;J.C. Lynch;T. Heldt
ObjectiveTo 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.MethodsThe transfer characteristic of an EVD system is investigated by its step and frequency responses with focus on the low frequency (LF) range from 0.02 to 0.065 Hz (important in PAR) and the location of the system's first resonance frequency (important for ICE). The effects of opening the distal end of the EVD for drainage of cerebrospinal fluid and the presence of trapped air bubbles are also investigated.ResultsThe EVD system exhibits a first resonant frequency below 4 Hz, resulting in significant distortion of the measured ICP waveform. The frequency response in the LF range only remains flat when the EVD is closed. Opening the drain results in drops in magnitude and phase along the entire frequency range above DC. Air bubbles close to the EVD catheter tip affect the LF range while an air bubble close to the pressure transducer further decreases the first resonant frequency. Tests with actual ICP waveforms confirmed EVD-induced waveform distortions that can lead to erroneous ICE estimation.ConclusionEVD-based ICP measurements distort the waveform morphology. PAR indices based on LF information are only valid if the EVD is closed. EVD-based ICE estimation is to be avoided.SignificanceICP waveform analyses to derive information about ICE and PAR should be critically questioned if only EVD derived ICP signals are at hand.
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影响因子:
3.3
作者:
W. Henry;L. B. Wilner;D. Harrison
通讯作者:
D. Harrison
DOI:
--
发表时间:
1988
期刊:
影响因子:
--
作者:
L. Geddes;J. Bourland
通讯作者:
J. Bourland
DOI:
10.1007/978-3-7091-9115-6_130
发表时间:
1990
期刊:
Acta neurochirurgica. Supplementum
影响因子:
--
作者:
I. Piper;J. Miller;Ian R. Whittle;A. Lawson
通讯作者:
A. Lawson
影响因子:
4.1
作者:
ROBERTSON, CS;NARAYAN, RK;SHERWOOD, AM
通讯作者:
SHERWOOD, AM
DOI:
--
发表时间:
1989
期刊:
Journal of Clinical Monitoring
影响因子:
--
作者:
B. Kleinman
通讯作者:
B. Kleinman