Abstract
Objective
To assess agreement between oscillometric noninvasive blood pressure (NIBP) measurements
using LifeWindow monitors (LW9xVet and LW6000V) and invasive blood pressure (IBP).
To assess the agreement of NIBP readings using a ratio of cuff width to mid-cannon
circumference of 25% and 40%.
Study design
Prospective, randomized clinical study.
Animals
A total of 43 adult horses undergoing general anesthesia in dorsal recumbency for
different procedures.
Methods
Anesthetic protocols varied according to clinician preference. IBP measurement was
achieved after cannulation of the facial artery and connection to an appropriately
positioned transducer connected to one of two LifeWindow multiparameter monitors (models:
LW6000V and LW9xVet). Accuracy of monitors was checked daily using a mercury manometer.
For each horse, NIBP was measured with two cuff widths (corresponding to 25% or 40%
of mid-cannon bone circumference), both connected to the same monitor, and six paired
IBP/NIBP readings were recorded (at least 3 minutes between readings). NIBP values
were corrected to the relative level of the xiphoid process. A Bland–Altman analysis
for repeated measures was used to assess bias (NIBP–IBP) and limits of agreement (LOAs).
Results
The 40% cuff width systolic arterial pressure [SAP; bias 7.9 mmHg, LOA –26.6 to 42.3;
mean arterial pressure (MAP): bias 4.9 mmHg, LOA –28.2 to 38.0; diastolic arterial
pressure (DAP): bias 4.2 mmHg, LOA –31.4 to 39.7)] performed better than the 25% cuff
width (SAP: bias 26.4 mmHg, LOA –21.0 to 73.9; MAP: bias 15.7 mmHg, LOA –23.8 to 55.2;
DAP: bias 10.9 mmHg, LOA –33.2 to 54.9).
Conclusions and clinical relevance
Using the LifeWindow multiparameter monitor in anesthetized horses, the 40% cuff width
provided better agreement with IBP; however, both cuff sizes and both monitor models
failed to meet American College of Veterinary Internal Medicine Consensus Statement
Guidelines.
Keywords
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Article info
Publication history
Published online: January 24, 2020
Accepted:
January 4,
2020
Received:
May 29,
2019
Identification
Copyright
© 2020 Association of Veterinary Anaesthetists and American College of Veterinary Anesthesia and Analgesia. Published by Elsevier Ltd. All rights reserved.
