Conditions: Chronic Obstructive Pulmonary Disease
Keywords: Indacaterol COPD salmeterol
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 552
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: Patients inhaled indacaterol 18.75 μg once daily in the morning via the Concept1 single-dose dry-powder inhaler (SDDPI). In addition, patients inhaled placebo to salmeterol twice daily, once in the morning and once in the evening, via the manufacturer's proprietary Diskus inhaler. Treatment continued for 2 weeks. Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. Albuterol via a multi-dose dry-powder inhaler (MDI) was available for rescue use throughout the study. arm 2: Patients inhaled indacaterol 37.5 μg once daily in the morning via the Concept1 single-dose dry-powder inhaler (SDDPI). In addition, patients inhaled placebo to salmeterol twice daily, once in the morning and once in the evening, via the manufacturer's proprietary Diskus inhaler. Treatment continued for 2 weeks. Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. Albuterol via a multi-dose dry-powder inhaler (MDI) was available for rescue use throughout the study. arm 3: Patients inhaled indacaterol 75 μg once daily in the morning via the Concept1 single-dose dry-powder inhaler (SDDPI). In addition, patients inhaled placebo to salmeterol twice daily, once in the morning and once in the evening, via the manufacturer's proprietary Diskus inhaler. Treatment continued for 2 weeks. Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. Albuterol via a multi-dose dry-powder inhaler (MDI) was available for rescue use throughout the study. arm 4: Patients inhaled indacaterol 150 μg once daily in the morning via the Concept1 single-dose dry-powder inhaler (SDDPI). In addition, patients inhaled placebo to salmeterol twice daily, once in the morning and once in the evening, via the manufacturer's proprietary Diskus inhaler. Treatment continued for 2 weeks. Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. Albuterol via a multi-dose dry-powder inhaler (MDI) was available for rescue use throughout the study. arm 5: Patients inhaled salmeterol 50 μg twice daily, once in the morning and once in the evening, via the manufacturer's proprietary Diskus inhaler. In addition, patients inhaled placebo to indacaterol once daily in the morning via the Concept1 single-dose dry-powder inhaler (SDDPI). Treatment continued for 2 weeks. Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. Albuterol via a multi-dose dry-powder inhaler (MDI) was available for rescue use throughout the study. arm 6: Patients inhaled placebo to indacaterol once daily in the morning via the Concept1 single-dose dry-powder inhaler (SDDPI). In addition, patients inhaled placebo to salmeterol twice daily, once in the morning and once in the evening, via the manufacturer's proprietary Diskus inhaler. Treatment continued for 2 weeks. Daily inhaled corticosteroid treatment (if applicable) was to remain stable throughout the study. Albuterol via a multi-dose dry-powder inhaler (MDI) was available for rescue use throughout the study.

Interventions: intervention 1: Indacaterol intervention 2: Salmeterol 50 μg intervention 3: Placebo to indacaterol intervention 4: Placebo to salmeterol
Intervention descriptions: intervention 1: Indacaterol was supplied in powder filled capsules together with a single-dose dry-powder inhaler (SDDPI) device. intervention 2: Salmeterol was supplied in the manufacturer's proprietary Diskus inhaler device. intervention 3: Placebo to indacaterol was supplied in powder filled capsules together with a single-dose dry-powder inhaler (SDDPI) device. intervention 4: Placebo to salmeterol was supplied in the manufacturer's proprietary Diskus inhaler device.

Protocol document: