Journal article
Monitoring of tidal ventilation by electrical impedance tomography in anaesthetised horses
Equine Veterinary Journal, Vol.51(2), pp.222-226
2018
Abstract
Background: Electrical impedance tomography (EIT) is a method to measure regional impedance changes within the thorax. The total tidal impedance variation has been used to measure changes in tidal volumes in pigs, dogs and men.
Objectives: To assess the ability of EIT to quantify changes in tidal volume in anaesthetised mechanically ventilated horses.
Study design: In vivo experimental study.
Methods: Six horses (mean ± s.d.: age 11.5 ± 7.5 years and body weight 491 ± 40 kg) were anaesthetised using isoflurane in oxygen. The lungs were mechanically ventilated using a volume-controlled mode. With an end-tidal carbon dioxide tension in the physiological range, and a set tidal volume (VTvent) of 11–16 mL/kg (baseline volume), EIT data and VT measured by conventional spirometry were collected over 1 min. Thereafter, VTvent was changed in 1 L steps until reaching 10 L. After, VTvent was reduced to 1 L below the baseline volume and then further reduced in 1 L steps until 4 L. On each VT step data were recorded for 1 min after allowing 1 min of stabilisation. Impedance changes within the predefined two lung regions of interest (EITROI) and the whole image (EITthorax) were calculated. Linear regression analysis was used to assess the relationship between spirometry data and EITROI and EITthorax for individual horses and pooled data.
Results: Both EITROI and EITthorax significantly predicted spirometry data for individual horses with R2 ranging from 0.937 to 0.999 and from 0.954 to 0.997 respectively. This was similar for pooled data from all six horses with EITROI (R2 = 0.799; P<0.001) and EITthorax (R2 = 0.841; P<0.001).
Main limitations: The method was only tested in healthy mechanically ventilated horses.
Conclusions: The EIT can be used to quantify changes in tidal volume.
Details
- Title
- Monitoring of tidal ventilation by electrical impedance tomography in anaesthetised horses
- Authors/Creators
- M. Mosing (Author/Creator)A.D. Waldmann (Author/Creator)A. Raisis (Author/Creator)S.H. Böhm (Author/Creator)E. Drynan (Author/Creator)K. Wilson (Author/Creator)
- Publication Details
- Equine Veterinary Journal, Vol.51(2), pp.222-226
- Publisher
- Equine Veterinary Journal Ltd
- Identifiers
- 991005543918907891
- Copyright
- © 2018 EVJ Ltd
- Murdoch Affiliation
- School of Veterinary and Life Sciences
- 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
- Veterinary Sciences
- ESI research areas
- Plant & Animal Science