A Comparison of the Bronchodilating Effects of a Beta-2 Adrenergic Agent (Albuterol) and an Anticholinergic Agent (Ipratropium Bromide), Given by Aerosol Alone or in Sequence

Abstract
We evaluated the effect of anticholinergic and beta-adrenergic inhaled bronchodilators, alone or in sequence, in 11 patients with chronic obstructive pulmonary disease. We compared the agents albuterol and ipratropium bromide when each was used as a single aerosol in the maximal dose. After giving a maximal dose of one agent, we compared the effect of adding the other with that of adding a placebo.