Assessment of distribution of ventilation by electrical impedance tomography in standing horses

T. D. Ambrisko, J. P. Schramel, A. Adler, O. Kutasi, Z. Makra, Y. P.S. Moens

Research output: Contribution to journalArticle

Abstract

The aim was to evaluate the feasibility of using electrical impedance tomography (EIT) in horses. Thoracic EIT was used in nine horses. Thoracic and abdominal circumference changes were also measured with respiratory ultrasound plethysmography (RUP). Data were recorded during baseline, rebreathing of CO 2 and sedation. Three breaths were selected for analysis from each recording. During baseline breathing, horses regularly took single large breaths (sighs), which were also analysed. Functional EIT images were created using standard deviations (SD) of pixel signals and correlation coefficients (R) of each pixel signal with a reference respiratory signal. Left-to-right ratio, centre-of-ventilation and global-inhomogeneity-index were calculated. RM-ANOVA and Bonferroni tests were used (P < 0.05). Distribution of ventilation shifted towards right during sighs and towards dependent regions during sighs, rebreathing and sedation. Global-inhomogeneity-index did not change for SD but increased for R images during sedation. The sum of SDs for the respiratory EIT signals correlated well with thoracic (r 2 = 0.78) and abdominal (r 2 = 0.82) tidal circumferential changes. Inverse respiratory signals were identified on the images at sternal location and based on reviewing CT images, seemed to correspond to location of gas filled intestines. Application of EIT in standing non-sedated horses is feasible. EIT images may provide physiologically useful information even in situations, such as sighs, that cannot easily be tested by other methods.

Original languageEnglish (US)
Article number175
Pages (from-to)175-186
Number of pages12
JournalPhysiological Measurement
Volume37
Issue number2
DOIs
StatePublished - Dec 29 2015

Fingerprint

Acoustic impedance
Electric Impedance
Horses
Ventilation
Tomography
Thorax
Pixels
Plethysmography
Carbon Monoxide
Analysis of variance (ANOVA)
Intestines
Analysis of Variance
Respiration
Gases
Ultrasonics

Keywords

  • distribution of ventilation
  • electrical impedance tomography
  • horse
  • respiration

ASJC Scopus subject areas

  • Biophysics
  • Physiology
  • Biomedical Engineering
  • Physiology (medical)

Cite this

Assessment of distribution of ventilation by electrical impedance tomography in standing horses. / Ambrisko, T. D.; Schramel, J. P.; Adler, A.; Kutasi, O.; Makra, Z.; Moens, Y. P.S.

In: Physiological Measurement, Vol. 37, No. 2, 175, 29.12.2015, p. 175-186.

Research output: Contribution to journalArticle

Ambrisko, T. D. ; Schramel, J. P. ; Adler, A. ; Kutasi, O. ; Makra, Z. ; Moens, Y. P.S. / Assessment of distribution of ventilation by electrical impedance tomography in standing horses. In: Physiological Measurement. 2015 ; Vol. 37, No. 2. pp. 175-186.
@article{3c3a3edc4cd9450e8fac07ef3e8ca488,
title = "Assessment of distribution of ventilation by electrical impedance tomography in standing horses",
abstract = "The aim was to evaluate the feasibility of using electrical impedance tomography (EIT) in horses. Thoracic EIT was used in nine horses. Thoracic and abdominal circumference changes were also measured with respiratory ultrasound plethysmography (RUP). Data were recorded during baseline, rebreathing of CO 2 and sedation. Three breaths were selected for analysis from each recording. During baseline breathing, horses regularly took single large breaths (sighs), which were also analysed. Functional EIT images were created using standard deviations (SD) of pixel signals and correlation coefficients (R) of each pixel signal with a reference respiratory signal. Left-to-right ratio, centre-of-ventilation and global-inhomogeneity-index were calculated. RM-ANOVA and Bonferroni tests were used (P < 0.05). Distribution of ventilation shifted towards right during sighs and towards dependent regions during sighs, rebreathing and sedation. Global-inhomogeneity-index did not change for SD but increased for R images during sedation. The sum of SDs for the respiratory EIT signals correlated well with thoracic (r 2 = 0.78) and abdominal (r 2 = 0.82) tidal circumferential changes. Inverse respiratory signals were identified on the images at sternal location and based on reviewing CT images, seemed to correspond to location of gas filled intestines. Application of EIT in standing non-sedated horses is feasible. EIT images may provide physiologically useful information even in situations, such as sighs, that cannot easily be tested by other methods.",
keywords = "distribution of ventilation, electrical impedance tomography, horse, respiration",
author = "Ambrisko, {T. D.} and Schramel, {J. P.} and A. Adler and O. Kutasi and Z. Makra and Moens, {Y. P.S.}",
year = "2015",
month = "12",
day = "29",
doi = "10.1088/0967-3334/37/2/175",
language = "English (US)",
volume = "37",
pages = "175--186",
journal = "Physiological Measurement",
issn = "0967-3334",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - Assessment of distribution of ventilation by electrical impedance tomography in standing horses

AU - Ambrisko, T. D.

AU - Schramel, J. P.

AU - Adler, A.

AU - Kutasi, O.

AU - Makra, Z.

AU - Moens, Y. P.S.

PY - 2015/12/29

Y1 - 2015/12/29

N2 - The aim was to evaluate the feasibility of using electrical impedance tomography (EIT) in horses. Thoracic EIT was used in nine horses. Thoracic and abdominal circumference changes were also measured with respiratory ultrasound plethysmography (RUP). Data were recorded during baseline, rebreathing of CO 2 and sedation. Three breaths were selected for analysis from each recording. During baseline breathing, horses regularly took single large breaths (sighs), which were also analysed. Functional EIT images were created using standard deviations (SD) of pixel signals and correlation coefficients (R) of each pixel signal with a reference respiratory signal. Left-to-right ratio, centre-of-ventilation and global-inhomogeneity-index were calculated. RM-ANOVA and Bonferroni tests were used (P < 0.05). Distribution of ventilation shifted towards right during sighs and towards dependent regions during sighs, rebreathing and sedation. Global-inhomogeneity-index did not change for SD but increased for R images during sedation. The sum of SDs for the respiratory EIT signals correlated well with thoracic (r 2 = 0.78) and abdominal (r 2 = 0.82) tidal circumferential changes. Inverse respiratory signals were identified on the images at sternal location and based on reviewing CT images, seemed to correspond to location of gas filled intestines. Application of EIT in standing non-sedated horses is feasible. EIT images may provide physiologically useful information even in situations, such as sighs, that cannot easily be tested by other methods.

AB - The aim was to evaluate the feasibility of using electrical impedance tomography (EIT) in horses. Thoracic EIT was used in nine horses. Thoracic and abdominal circumference changes were also measured with respiratory ultrasound plethysmography (RUP). Data were recorded during baseline, rebreathing of CO 2 and sedation. Three breaths were selected for analysis from each recording. During baseline breathing, horses regularly took single large breaths (sighs), which were also analysed. Functional EIT images were created using standard deviations (SD) of pixel signals and correlation coefficients (R) of each pixel signal with a reference respiratory signal. Left-to-right ratio, centre-of-ventilation and global-inhomogeneity-index were calculated. RM-ANOVA and Bonferroni tests were used (P < 0.05). Distribution of ventilation shifted towards right during sighs and towards dependent regions during sighs, rebreathing and sedation. Global-inhomogeneity-index did not change for SD but increased for R images during sedation. The sum of SDs for the respiratory EIT signals correlated well with thoracic (r 2 = 0.78) and abdominal (r 2 = 0.82) tidal circumferential changes. Inverse respiratory signals were identified on the images at sternal location and based on reviewing CT images, seemed to correspond to location of gas filled intestines. Application of EIT in standing non-sedated horses is feasible. EIT images may provide physiologically useful information even in situations, such as sighs, that cannot easily be tested by other methods.

KW - distribution of ventilation

KW - electrical impedance tomography

KW - horse

KW - respiration

UR - http://www.scopus.com/inward/record.url?scp=84956672240&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84956672240&partnerID=8YFLogxK

U2 - 10.1088/0967-3334/37/2/175

DO - 10.1088/0967-3334/37/2/175

M3 - Article

C2 - 26711858

AN - SCOPUS:84956672240

VL - 37

SP - 175

EP - 186

JO - Physiological Measurement

JF - Physiological Measurement

SN - 0967-3334

IS - 2

M1 - 175

ER -