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| Methods | Longer duration: 4 weeks treatment and placebo Cross‐over Double‐blind Dropout: 0% | |
| Participants | n = 12 Mean age = 61 Inclusion: reversible COPD: FEV1 < 1 L with > 20% reversal. Could continue taking inhalers, steroids. Exclusion: other lung disease or serious disease of other organs | |
| Interventions | Atenolol 100 mg/d Metoprolol 100 mg/d Placebo | |
| Outcomes | Symptoms Exercise tolerance | |
| Notes | FEV1 reported only as % of predicted normal value | |
