title: In vivo accuracy of two intraparenchymal intracranial pressure monitors.
abstract: OBJECTIVE
  To evaluate the in vivo accuracy of the new Pressio(®) device for intraparenchymal monitoring of intracranial pressure (ICP) versus the Codman(®) device and intraventricular measurement external ventricular drainage (EVD).
  
  
  METHODS
  Data were collected retrospectively for 30 consecutive patients admitted into a 25-bed neurosurgical intensive care unit of a university hospital between January and December 2009. Patients received both intraventricular and intraparenchymal ICP monitoring with Pressio(®) (n = 15) or Codman(®) (n = 15).
  
  
  RESULTS
  We obtained 3,089 data points from the 30 patients. Mean difference between intraparenchymal and EVD pressure (bias) was -0.6 mmHg, and limits of agreement (1.96 SD of the bias) were -8.1 to 6.9 mmHg with Pressio(®) and 0.3 mmHg with limits of agreement of -6.7 to 7.1 mmHg with Codman(®) (NS). The temporal difference was -0.7 ± 1.6 mmHg/100 h of monitoring with Pressio(®) and 0.1 ± 1.6 mmHg/100 h of monitoring with Codman(®) over the study period (NS).
  
  
  CONCLUSIONS
  Intraparenchymal pressure measured with both transducers approximates intraventricular cerebrospinal fluid pressure with an accuracy of ±7 mmHg.
authors.affiliation: Anaesthesiology and Critical Care Department, Assistance Publique-Hôpitaux de Paris et Université Pierre et Marie Curie, Paris, France. thomas.lescot@psl.aphp.fr
authors.forename: Thomas
authors.initials: T
authors.lastname: Lescot
authors.forename: Vincent
authors.initials: V
authors.lastname: Reina
authors.forename: Yannick
authors.initials: Y
authors.lastname: Le Manach
authors.forename: Filippo
authors.initials: F
authors.lastname: Boroli
authors.forename: Dorian
authors.initials: D
authors.lastname: Chauvet
authors.forename: Anne-Laure
authors.initials: AL
authors.lastname: Boch
authors.forename: Louis
authors.initials: L
authors.lastname: Puybasset
mesh_terms: D000328:Adult; D001930:Brain Injuries; D057785:Catheters; D015170:Cerebrospinal Fluid Pressure / Q000502:physiology; D005260:Female; D005602:France; D006801:Humans; D007362:Intensive Care Units; D007427:Intracranial Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D014160:Transducers, Pressure; D055815:Young Adult