Abstract
ObjectiveTo assess zero drift of intraventricular and subdural intracranial pressure (ICP) monitoring systems. MethodsA prospective study was conducted in patients who received Codman ICP monitoring in the neurosurgical department from January 2010 to December 2011. According to the location of sensors, the patients were categorized into two groups: intraventricular group and subdural group. Zero drift between the two groups and its association with the duration of ICP monitor were analyzed. ResultsTotally, 22 patients undergoing intraventricular ICP monitoring and 27 receiving subdural ICP monitoring were enrolled. There was no significant difference in duration of ICP monitoring, zero drift value and its absolute value between intraventricular and subdural groups (5.38 d±2.58 d vs 4.58 d±2.24 d, 0.77mm Hg±2.18mm Hg vs 1.03mm Hg±2.06mm Hg, 1.68mm Hg±1.55mm Hg vs 1.70mm Hg±1.53mm Hg, respectively; all P>0.05). Absolute value of zero drift in both groups significantly rose with the increased duration of ICP monitoring (P<0.05) while zero drift value did not. Moreover, daily absolute value in the intraventricular group was significantly smaller than that in the subdural group (0.27mm Hg±0.32mm Hg vs 0.29mm Hg±0.18mm Hg, P<0.05). ConclusionThis study demonstrates that absolute value of zero drift significantly correlates with duration of both intraventricular and subdural ICP monitoring. Due to the smaller daily absolute value, ICP values recorded from intraventricular system may be more reliable than those from subdural system.
Published Version
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