Duration of Protective Effect From Inhaled Ipratropium Bromide on Methacholine Airway Hyperresponsiveness

Duration of Protective Effect From Inhaled Ipratropium Bromide on Methacholine Airway Hyperresponsiveness

Certain lung disease medications can influence diagnostic tests and research investigations. This study will investigate how long ipratropium bromide must be withheld before a methacholine challenge test can be conducted. This information will be useful for validating current guidelines.

Inclusion Criteria:

• Diagnosis of asthma; stable and controlled
• FEV1 greater than or equal to 65% predicted

Exclusion Criteria:

• Concomitant lung disease other than asthma