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Agreement between invasive blood pressure measured in three peripheral arteries in anaesthetised horses under clinical conditions

Wilson, K. AT, Raisis, A.L., Drynan, E.A., Lester, G.D. and Hosgood, G.L. (2018) Agreement between invasive blood pressure measured in three peripheral arteries in anaesthetised horses under clinical conditions. Veterinary Anaesthesia and Analgesia, 45 (3). pp. 338-344.

Link to Published Version: https://doi.org/10.1016/j.vaa.2017.11.004
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Abstract

Objective
To determine agreement between invasive blood pressure measured in three peripheral arteries in anaesthetized horses undergoing elective surgery.

Study design
Prospective balanced incomplete block design.

Animals
A total of 18 client owned horses.

Methods
Invasive blood pressure (IBP) was measured simultaneously in one of the following three combinations: i) transverse facial and facial artery; ii) transverse facial and metatarsal artery and iii) facial and metatarsal artery. The agreement in blood pressure measured for each combination was performed in six horses. At each sample time, systolic (SAP), mean (MAP) and diastolic (DAP) arterial pressures were measured concurrently in each artery and the mean of three consecutive measurements was recorded. Position of horse, heart rate and the use of dobutamine were also recorded. Bland Altman analysis was used to assess agreement between sites.

Results
A total of 54 paired measurements were obtained, with 18 paired measurements from each combination. All paired measurements showed poor and haphazard (non-systematic) agreement. The widest limit of agreement was 51mmHg for SAP measured in the facial artery and metatarsal artery with a bias of -11 mmHg. The smallest limit of agreement was 16 mmHg for MAP measured in the transverse facial and the metatarsal artery with a bias of 1 mmHg.

Conclusion
There was poor and haphazard agreement for SAP, MAP and DAP measured in each pair of peripheral arteries in this study. These results show that blood pressure measured in different peripheral arteries cannot be used interchangeably. This has implications for studies that use IBP as an outcome variable and studies determining agreement between non-invasive blood pressure and IBP measurements in horses under general anaesthesia.

Publication Type: Journal Article
Murdoch Affiliation: School of Veterinary and Life Sciences
Publisher: Elsevier Ltd
Copyright: © 2018 Association of Veterinary Anaesthetists and American College of Veterinary Anesthesia and Analgesia
URI: http://researchrepository.murdoch.edu.au/id/eprint/40066
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