Conditions: Asthma
Keywords: Albuterol Forced expiratory volume in one second Dose at fifty percent of maximum effect Maximum effective dose Metered dose inhaler Nebulizer
Allocation: NA | Intervention model: SINGLE_GROUP
Enrollment: 81
Healthy volunteers: no

Brief summary:
The purpose of this study was to determine the lung function response after increasing doses of albuterol (a bronchodilator) in children and adults with asthma.

Detailed description:
Inhaled short-acting b2-agonists (SABA) are the most potent bronchodilators used today to treat acute symptoms of asthma and albuterol, a partial b2-agonist, is the most frequently prescribed asthma medication in the US. Although universally used in for acute asthma symptoms, SABA have been associated with a significant degree of interpatient variability. Many studies have characterized the SABA dose to bronchodilator response relationship under controlled conditions. However, few studies have explored the magnitude and sources of bronchodilator response variability, and no studies have characterized the dose versus bronchodilator response relationship using population pharmacokinetic/pharmacodynamic (PPK/PD) modeling. In the present study, we characterized the relationship between inhaled doses of albuterol and bronchodilation in 81 children and adults with moderate to severe persistent asthma using a population pharmacodynamic approach. The purpose of this study was to obtain estimates of the pharmacodynamic parameters that characterize the dose-response curve, including maximal dose for bronchodilation, and to quantify and identify sources of interpatient pharmacodynamic variability.

Arms:

Interventions: intervention 1: albuterol
Intervention descriptions: intervention 1: Albuterol administered sequentially 180mcg (MDI), 90mcg (MDI), 90mcg(MDI), 90mcg (MDI), 90mcg (MDI), 2.5mg (nebulized)

Protocol document: