title: Comparison of water manometry to 2 commercial electronic pressure monitors for central venous pressure measurement in horses.
abstract: BACKGROUND
  Central venous pressure (CVP) customarily has been measured in veterinary patients with water manometry. However, many institutions are now using stallside electronic monitors in both anesthesia and intensive care units for many aspects of patient monitoring.
  
  
  OBJECTIVE
  Electronic stall side monitoring devices will agree with water manometry for measurement of CVP in horses.
  
  
  METHODS
  Ten healthy adult horses from the university research herd.
  
  
  METHODS
  Central venous catheters were placed routinely, and measurements were obtained in triplicate with each of the 3 methods every 12 hours for 3 days. Data were analyzed by a Lin concordance correlation coefficient and modified Bland-Altman limits of agreement, with all devices compared pairwise.
  
  
  RESULTS
  Compared with water manometry, agreement (bias) of the Passport was -1.94 cmH₂O (95% limits of agreement, -8.54 to 4.66 cmH₂O) and of the Medtronic was -1.83 cmH₂O (95% limits of agreement, -8.60 to 4.94 cmH₂O). When compared with the Passport, agreement of the data obtained with the Medtronic was 0.27 cmH₂O (95% limits of agreement, -4.39 to 4.93 cmH₂O).
  
  
  CONCLUSIONS
  These data show that both electronic monitors systematically provide measurements that are approximately 2 cmH₂O lower than water manometry, but differences between the 2 electronic devices are small enough (< 0.5 cmH₂O) to be considered clinically unimportant. This discrepancy should be taken into account when interpreting data obtained with these monitoring devices.
authors.affiliation: Department of Clinical Studies, New Bolton Center, University of Pennsylvania, Kennett Square, PA, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Norton
authors.forename: R D
authors.initials: RD
authors.lastname: Nolen-Walston
authors.forename: C
authors.initials: C
authors.lastname: Underwood
authors.forename: J
authors.initials: J
authors.lastname: Slack
authors.forename: R
authors.initials: R
authors.lastname: Boston
authors.forename: B L
authors.initials: BL
authors.lastname: Dallap
mesh_terms: D000818:Animals; D015924:Blood Pressure Monitors / Q000662:veterinary*; D002405:Catheterization, Central Venous / Q000295:instrumentation / Q000662:veterinary*; D002496:Central Venous Pressure / Q000502:physiology*; D006736:Horses / Q000502:physiology*; D008365:Manometry; D014160:Transducers, Pressure / Q000662:veterinary