Conditions: Asthma
Keywords: Indacaterol asthma salmeterol
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 511
Healthy volunteers: no

Brief summary:
This study compared the 14-day bronchodilator efficacy of indacaterol with that of placebo and salmeterol

Detailed description:

Arms:
arm 1: Indacaterol 18.75 µg once daily in the morning via Concept1, a single-dose dry powder inhaler (SDDPI) and Placebo to Salmeterol in the morning and in the evening via Diskus®, a multi-dose dry powder inhaler (MDDPI) for 2 weeks.

Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. The short acting (beta) β2-agonist (SABA) albuterol was available for rescue use throughout the study. arm 2: Indacaterol 37.5 µg once daily in the morning via Concept1, a SDDPI and Placebo to Salmeterol in the morning and in the evening via Diskus®, a MDDPI for 2 weeks.

Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. The short acting (beta) β2-agonist (SABA) albuterol was available for rescue use throughout the study. arm 3: Indacaterol 75 µg once daily in the morning via Concept1, a SDDPI and Placebo to Salmeterol in the morning and in the evening via Diskus®, a MDDPI for 2 weeks.

Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. The short acting (beta) β2-agonist (SABA) albuterol was available for rescue use throughout the study. arm 4: Indacaterol 150 µg once daily in the morning via Concept1, a SDDPI and Placebo to Salmeterol in the morning and in the evening via Diskus®, MDDPI for 2 weeks.

Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. The short acting (beta) β2-agonist (SABA) albuterol was available for rescue use throughout the study. arm 5: Salmeterol 50 µg twice daily in the morning and in the evening via Diskus®, a multi-dose dry powder inhaler (MDDPI) and Placebo to Indacaterol once daily in the morning via Concept1, a SDDPI for 2 weeks.

Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. The short acting (beta) β2-agonist (SABA) albuterol was available for rescue use throughout the study. arm 6: Placebo to Indacaterol once daily in the morning via Concept 1, a SDDPI and Placebo to Salmeterol in the morning and in the evening via Diskus®, a MDDPI for 2 weeks.

Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. The short acting (beta) β2-agonist (SABA) albuterol was available for rescue use throughout the study.

Interventions: intervention 1: Indacaterol intervention 2: Salmeterol intervention 3: Placebo to Indacaterol intervention 4: Placebo to Salmeterol
Intervention descriptions: intervention 1: Once daily via Concept1, a single-dose dry powder inhaler (SDDPI) for two week. Dosage varies according to randomization scheme. intervention 2: 50 µg Salmeterol twice daily in the morning and in the evening via Diskus®, a MDDPI for 2 weeks. intervention 3: Placebo to Indacaterol once daily in the morning via Concept 1, a SDDPI. intervention 4: Placebo to Salmeterol twice daily in the morning and in the evening via Diskus®, a multi-dose dry powder inhaler (MDDPI).

Protocol document: