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- W222059450 abstract "Inflammatory airway disease (IAD) is very common in stabled horses. Short-acting beta agonist (SABA) drugs are often used to relieve clinical signs, although long-term exposure to these drugs may result in rebound bronchoconstriction. The purpose of this study was twofold: i) to describe the deposition of radiolabeled drugs using a novel one-nostril design mask-spacer combination with a breath-activated inhaler (BAI), and ii) to determine whether treatment for 10 d with inhaled albuterol using this device would impair the ability of albuterol to prevent bronchospasm during a histamine challenge test. The percentage of radio-aerosol deposited in the total lung was 12.39% ± 5.05%. All study horses demonstrated airway hyperresponsiveness (AHR) before enrollment in the study [mean provocative concentration eliciting 35% increase in delta flow (PC35) < 6 mg/mL histamine]. There was no significant difference in airway hyperresponsiveness to post-albuterol histamine challenge before or after treatment with albuterol. A 10-d treatment with placebo, however, caused a significant increase in airway hyperresponsiveness in all horses (P < 0.001). The results of this study show that the novel mask-spacer device was effective in delivering radiolabeled aerosolized drug to the lung and that delivery of a SABA for 10 d using this device did not result in increased airway hyperresponsiveness.La maladie inflammatoire des voies respiratoires (IAD) est très courante chez les chevaux gardés en écurie. Les médicaments agonistes bêta à courte action (SABA) sont souvent utilisés pour soulager les signes cliniques, bien qu’une exposition prolongée à ces médicaments puisse résulter en une bronchoconstriction rebond. Le but de la présente étude était double : i) décrire le dépôt de médicaments radio-marqués en utilisant un nouveau design de chambre d’inhalation pour une seule narine avec un inhalateur activé par l’haleine (BAI), et ii) déterminer si un traitement pendant 10 j avec de l’albuterol inhalé avec cet appareil compromettrait la capacité de l’albuterol à prévenir un bronchospasme durant un test défi à l’histamine. Le pourcentage d’aérosol radio-marqué déposé dans le poumon total était de 12,39 % ± 5,05 %. Tous les chevaux dans l’étude ont montré une hyperréactivité des voies respiratoires (AHR) avant l’incorporation dans l’étude [concentration moyenne induisant une augmentation de 35 % du delta flot (PC35) < 6 mg/mL d’histamine]. Il n’y avait pas de différence significative d’hyperréactivité des voies respiratoires au challenge à l’histamine post-albuterol avant ou après traitement avec de l’albuterol. Toutefois, un traitement pendant 10 j avec un placebo a causé une augmentation significative d’hyperréactivité des voies respiratoires chez tous les chevaux (P < 0,001). Les résultats de la présente étude ont montré que le nouveau design d’inhalateur était efficace pour la distribution par aérosol de médicament radio-marqué dans les poumons et que l’administration de SABA pendant 10 j à l’aide de cet appareil n’a pas causé d’augmentation de l’hyperréactivité des voies respiratoires.(Traduit par Docteur Serge Messier)." @default.
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- W222059450 date "2014-07-01" @default.
- W222059450 modified "2023-09-23" @default.
- W222059450 title "Use of a novel one-nostril mask-spacer device to evaluate airway hyperresponsiveness (AHR) in horses after chronic administration of albuterol." @default.
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