CHEN Li,DU Hang-gen,YIN Li-chun,HE Min,ZHANG Guo-jun,TIAN Yong,WANG Cheng,HAO Bi-lie,LI Hong-yu.[J].Chin J Traumatol,2013,16(2):99-102. [doi]
Zero drift of intraventricular and subdural intracranial pressure monitoring systems
  
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KeyWord: Intracranial pressure  Equipment failure  Cerebral ventricles  Subdural space
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Author NameAffiliation
CHEN Li Neurosurgical Department, Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310003, China 
DU Hang-gen Neurosurgical Department, Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310004, China 
YIN Li-chun Neurosurgical Department, Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310005, China 
HE Min Neurosurgical Department, Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310006, China 
ZHANG Guo-jun Neurosurgical Department, Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310007, China 
TIAN Yong Neurosurgical Department, Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310008, China 
WANG Cheng Neurosurgical Department, Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310009, China 
HAO Bi-lie Neurosurgical Department, Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310010, China 
LI Hong-yu Neurosurgical Department, Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310011, China 
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Abstract:
      Objective: To assess zero drift of intraventricular and subdural intracranial pressure (ICP) monitoring systems. Methods: A 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. Results: Totally, 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±2.58dvs4.58d±2.24d,0.77mmHg±2.18mmHgvs1.03mmHg±2.06mmHg,1.68mmHg±1.55mmHgvs1.70mmHg±1.53mmHg, 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 zerodrift value did not. Moreover, daily absolute value in the intraventricular group was significantlysmaller than that in the subdural group (0.27mm Hg± 0.32mm Hg vs 0.29mm Hg±0.18 mm Hg, P<0.05). Conclusion: This 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 maybe more reliable than those from subdural system.
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