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Clinical efficacy of bronchodilators in equine asthma: Looking for minimal important difference


Calzetta, L and Crupi, R and Roncada, P and Pistocchini, E and di Cave, D and Rossi, I and Cito, G and Jacobson, GA and Britti, D, Clinical efficacy of bronchodilators in equine asthma: Looking for minimal important difference, Equine Veterinary Journal pp. 1-9. ISSN 0425-1644 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 EVJ Ltd.

DOI: doi:10.1111/evj.13137


Background: Airway obstruction is the main trait of severe equine asthma that affects respiratory function and elicits detrimental effects on clinical presentation. Only few and underpowered clinical studies have investigated the impact of improvement in lung function induced by bronchodilators on the clinical signs of asthma-affected horses.

Objectives: To identify the minimal important difference (MID) in lung function elicited by bronchodilator leading to a meaningful improvement in clinical signs.

Study design: Pairwise meta-analysis and meta-regression analysis.

Methods: Literature searches were performed for studies that investigated the effect of bronchodilator therapy on lung function and clinical condition of asthmatic horses. The relationship between the change in lung function variables and clinical score was analysed via random-effect meta-regression. One-point change of the Improved clinically Detectable Equine Asthma Scoring System (IDEASS) score was used to identify the MID.

Results: A significant (P<0.05) relationship was found between the changes in IDEASS score and maximum change in transpulmonary pressure (?Ρmax) or pulmonary resistance (RL). Since only the model resulting for RL passed through the origin (Y-intercept when X = 0: -0.31, 95% CI -0.75 to 0.14), this variable was used to identify the MID correlated with a meaningful improvement in clinical signs. The resulting MID value was a change in RL of 0.63 cm H2O/L/s (95% CI 0.33-0.94), representing the slope of meta-regression model (high quality of evidence).

Main limitations: No long-term studies investigated the effect of bronchodilator agents on both lung function and clinical signs in asthmatic horses.

Conclusions: In conclusion, bronchodilator pharmacotherapy in equine asthma elicits clinically meaningful effect when RL increases >=1 cm H2O/L/s, a value indicating the MID. Assessing the MID based on change in RL may improve the quality of evidence and the scientific impact of future clinical trials as it extends beyond the simple, and limiting, evaluation of statistical significance.

Item Details

Item Type:Refereed Article
Keywords:horse; bronchodilator pharmacotherapy;equine asthma;clinical efficacy
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Veterinary sciences
Research Field:Veterinary pharmacology
Objective Division:Manufacturing
Objective Group:Veterinary pharmaceutical products
Objective Field:Veterinary pharmaceutical treatments
UTAS Author:Jacobson, GA (Professor Glenn Jacobson)
ID Code:137031
Year Published:2019
Web of Science® Times Cited:4
Deposited By:Pharmacy
Deposited On:2020-01-29
Last Modified:2022-09-05

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