Comparison of arterial blood pressure measurements obtained invasively or oscillometrically using a Datex S/5 Compact monitor in anaesthetised adult horses

Yamaoka, T. T., Flaherty, D., Pawson, P., Scott, M. and Auckburally, A. (2017) Comparison of arterial blood pressure measurements obtained invasively or oscillometrically using a Datex S/5 Compact monitor in anaesthetised adult horses. Veterinary Anaesthesia and Analgesia, 44(3), pp. 492-501. (doi: 10.1016/j.vaa.2016.05.008)

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Objective: To assess agreement between non-invasive blood pressure (NIBP) oscillometrically-derived values from a multiparameter monitor (Datex Ohmeda S/5 Compact), with those obtained by invasive blood pressure (IBP) measurement, in anaesthetised horses undergoing elective surgery. Study design: Prospective clinical study. Animal population: Forty healthy adult horses. Methods: Horses were anaesthetised with various anaesthetic protocols (based on clinical requirements). Depending on positioning, cannulation of the facial or lateral metatarsal artery was performed for IBP measurement. The cannula was connected via a transducer to the monitor. An appropriately sized NIBP cuff was placed around the tail base and connected to the same monitor. Systolic (SAP), mean (MAP) and diastolic (DAP) arterial blood pressures were continuously recorded from the invasive system, and at 3 minute intervals from the oscillometric system, throughout the surgical procedure using a Datex iCollect program. An appropriate arithmetic correction factor was applied to the oscillometric results where the cuff was not level with the heart. Assessment of the degree of agreement between invasive and non-invasive readings at each time-point was performed using a modified Bland-Altman analysis. Results: While in many horses there was relatively close correlation between the values obtained over time, there was substantial variability in individual animals which resulted in wide Bland-Altman limits of agreement. The oscillometric device over-reads by approximately 32, 23 and 22 mmHg, and under-reads by 26, 17 and 19 mmHg for SAP, MAP and DAP respectively, compared with the IBP values. However, using the mean difference and standard deviation, the device conforms to ACVIM standards. Conclusions: and clinical relevance Oscillometric blood pressure measurement using the Datex Ohmeda S/5 Compact multiparameter monitor conforms to ACVIM standards when the NIBP cuff is placed on the tail. However, due to the wide variability in measurements, we cannot recommend this technique to guide therapy in anaesthetised adult horses.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Pawson, Dr Pat and Flaherty, Professor Derek and Scott, Professor Marian and Auckburally, Mr Adam
Authors: Yamaoka, T. T., Flaherty, D., Pawson, P., Scott, M., and Auckburally, A.
College/School:College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
College of Science and Engineering > School of Mathematics and Statistics > Statistics
Journal Name:Veterinary Anaesthesia and Analgesia
ISSN (Online):1467-2995
Published Online:11 January 2017
Copyright Holders:Copyright © 2017 Elsevier
First Published:First published in Veterinary Anaesthesia and Analgesia 44(3):492-501
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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