Characterization of normal tidal breathing flow-volume loops for Thoroughbred horses |
| |
Authors: | A J Guthrie R E Beadle R D Bateman C E White |
| |
Institution: | (1) Department of Veterinary Physiology, Pharmacology and Toxicology, Louisiana State University, 70803 Baton Rouge, LA, USA;(2) Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, 70803 Baton Rouge, LA, USA;(3) Present address: Equine Research Centre, P/Bag X04, 0110 Onderstepoort, Republic of South Africa |
| |
Abstract: | The purpose of this study was to characterize the normal equine tidal breathing flow-volume loop (TBFVL). The study was performed using 18 healthy Thoroughbred horses. TBFVLs constructed from data collected from resting horses had a typical biphasic inspiratory and expiratory phase. The interindividual variability of the indices used to describe TBFVLs was in the range 16–32%, which is comparable to the variability of other measures of equine pulmonary mechanics. The large variability of these data probably limits the value of resting TBFVL indices for detecting subclinical respiratory conditions in individual horses. Factor analysis of these data revealed that in excess of 90% of the variance of the initial response variables could be explained in terms of three common factors. Varimax rotation of these three common factors provided three subsequent factors that were readily identifiable as (1) a factor describing the time-volume relationships of TBFVLs, responsible for 81% of the total variance, (2) a factor explaining the expiratory portion of the TBFVL, explaining 12% of the variance, and (3) a factor describing the inspiratory portion of the loops, responsible for the remaining 7% of the variance. The analysis also provided standardized factor scoring coefficients for use in subsequent studies using similar experimental techniques.Abbreviations EF25
expiratory flow at expiratory volume plus 25%V
E
- EF50
midtidal expiratory flow
-
f
respiratory rate
- IF25
inspiratory flow at 25% of inspiratory volume
- IF50
midtidal inspiratory flow
- MSA
measure of sampling adequacy
- PEF
peak expiratory flow
- PIF
peak inspiratory flow
- TBFVL
tidal breathing flow-volume loop
-
T
E
expiratory time
-
T
I
inspiratory time
- USPTM
ultrasonic pneumotachometer
-
V
E
expiratory volume
-
V
I
inspiratory volume |
| |
Keywords: | flow-volume loop expiration horse inspiration lung respiration |
本文献已被 SpringerLink 等数据库收录! |
|