Determining Optimal Free Dose Combination of Tiotropium Bromide and BI 1744 CL in Chronic Obstructive Pulmonary Disease (COPD)

Inclusion criteria:

1. All patients must sign an informed consent
2. All patients must have a diagnosis of chronic obstructive pulmonary disease (COPD) must meet the following spirometric criteria:

a post-bronchodilator forced expiratory flow in 1 second (FEV1) =<30% of predicted normal and <80% of predicted normal and a post bronchodilator FEV1 / forced vital capacity (FVC) <70% at Visit 1 4. Male or female patients, 40 years of age or older. 5. Patients must be current or ex-smokers with a smoking history of more than 10 pack years

Exclusion criteria:

• Patients with a significant disease other than COPD;
• Patients with clinically relevant abnormal baseline haematology, blood chemistry, or urinalysis;
• Patients with a history of asthma or a total blood eosinophil count >=600/mm3.
• Patients with any of the following conditions:

a diagnosis of thyrotoxicosis (due to the known class side effect profile of ß2-agonists) a diagnosis of paroxysmal tachycardia - Patients with any of the following conditions: a history of myocardial infarction within 1 year of screening visit a diagnosis of clinically relevant cardiac arrhythmia a malignancy for which patient has undergone resection, radiation therapy or chemotherapy within last five years

• Patients who have undergone thoracotomy with pulmonary resection
• Patients being treated with the following concomitant medications:

medications that prolong the QT/QTc interval oral Beta-adrenergics oral corticosteroid medication at unstable doses (i.e., less than six weeks on a stable dose) or at doses in excess of the equivalent of 10 mg of prednisone per day or 20 mg every other day

- Pregnant or nursing women