Use of Electrical Impedance Tomography (EIT) to estimate tidal volume in Anaesthetized horses undergoing elective surgery

B. Crivellari; A. Raisis; G. Hosgood; A.D. Waldmann; D. Murphy; M. Mosing

doi:10.3390/ani11051350

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Use of Electrical Impedance Tomography (EIT) to estimate tidal volume in Anaesthetized horses undergoing elective surgery

Journal article

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Peer reviewed

Use of Electrical Impedance Tomography (EIT) to estimate tidal volume in Anaesthetized horses undergoing elective surgery

B. Crivellari, A. Raisis, G. Hosgood, A.D. Waldmann, D. Murphy and M. Mosing

Animals, Vol.11(5), Article 1350

2021

DOI: https://doi.org/10.3390/ani11051350

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Abstract

This study explores the application of electric impedance tomography (EIT) to estimate tidal volume (VT) by measuring impedance change per breath (∆Zbreath). Seventeen healthy horses were anaesthetised and mechanically ventilated for elective procedures requiring dorsal recumbency. Spirometric VT (VTSPIRO) and ∆Zbreath were recorded periodically; up to six times throughout anaesthesia. Part 1 assessed these variables at incremental delivered VT of 10, 12 and 15 mL/kg. Part 2 estimated VT (VTEIT) in litres from ∆Zbreath at three additional measurement points using a line of best fit obtained from Part 1. During part 2, VT was adjusted to maintain end-tidal carbon dioxide between 45–55 mmHg. Linear regression determined the correlation between VTSPIRO and ∆Zbreath (part 1). Estimated VTEIT was assessed for agreement with measured VTSPIRO using Bland Altman analysis (part 2). Marked variability in slope and intercepts was observed across horses. Strong positive correlation between ∆Zbreath and VTSPIRO was found in each horse (R2 0.9–0.99). The agreement between VTEIT and VTSPIRO was good with bias (LOA) of 0.26 (−0.36–0.88) L. These results suggest that, in anaesthetised horses, EIT can be used to monitor and estimate VT after establishing the individual relationship between these variables.

Details

Title: Use of Electrical Impedance Tomography (EIT) to estimate tidal volume in Anaesthetized horses undergoing elective surgery
Authors/Creators: B. Crivellari (Author/Creator) - Murdoch University
A. Raisis (Author/Creator) - Murdoch University
G. Hosgood (Author/Creator) - Murdoch University
A.D. Waldmann (Author/Creator) - University of Rostock
D. Murphy (Author/Creator) - Murdoch University
M. Mosing (Author/Creator) - Murdoch University
Publication Details: Animals, Vol.11(5), Article 1350
Publisher: Multidisciplinary Digital Publishing Institute (MDPI)
Identifiers: 991005542659507891
Copyright: © 2021 The Authors
Murdoch Affiliation: School of Veterinary Medicine
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 1 Clinical & Life Sciences; 1.154 Assisted Ventilation; 1.154.277 Mechanical Ventilation
Web Of Science research areas: Agriculture, Dairy & Animal Science; Veterinary Sciences; Zoology
ESI research areas: Plant & Animal Science