 Chronic Obstructive Pulmonary Disease COPD is a chronic respiratory condition with deteriorating lung function over the years. Patients with COPD experience symptoms of shortness of breath, cough and sputum production. This study is to assess the treatment effects after inhalation of three different single doses of AZD9164 100, 400 and 1200 mcg and one single dose of tiotropium 18 mcg. One dose of placebo will be given as comparator. 25 patients are to participate in the study and all will be recruited in Sweden. Each patient will visit the study doctor 9 times during the study, whereof 5 visits will be overnight visits. All examinations, treatment and the follow-up is free of charge. 