A Single Inhalation Dose Study to Assess Efficacy, Pharmacokinetics (PK), Safety and Tolerability of AZD8871 in Patients With Long-term Lung Diseases.

Inclusion Criteria: 1. Provision of signed and dated, written ICF prior to any study-specific procedures, sampling, and analyses. 2. Patient must be 40 to 85 years male and/or females of non-childbearing potential who are not pregnant/lactating at the time of signing the ICF (Screening; Visit 1). 3. Patient with an established clinical history of moderate to severe COPD for more than 1 year at Screening, according to the GOLD COPD guidelines. 4. Patient who is a current or former smoker (defined as one who has stopped smoking for at least 6 months prior to Screening) with a history of ≥10 pack-years of cigarette smoking \[Number of pack-years=(number of cigarettes per day/20)\* number of years smoked (eg, 1 pack-year=20 cigarettes smoked per day for 1 year)\]. 5. Patient with post-bronchodilator FEV1/forced vital capacity (FVC) ratio \<70% based on the value reached after inhalation of salbutamol (400 µg) at Visit 2. If criterion is not met, the test can be repeated at the latest, up to Day -14. 6. Patient with post-bronchodilator FEV1 that must be ≥40% and \<80% predicted normal value at Visit 2. If criterion is not met, the test can be repeated at the latest, up to Day -14. 7. Patient is willing and, in the opinion of the Investigator, able to change current COPD therapy as required by the protocol and willing to use ipratropium following the approved dosage and regimen (during run-in and wash-out periods) with or without ICS for maintenance therapy of COPD and rescue medication salbutamol (as needed) from Visit 1 to Visit 11. 8. Patient must be able to read, speak and understand local language, and be willing to remain at the study centre as required per-protocol to complete all visit assessments. 9. Body mass index (BMI) \<40 kg/m2 at the time of Screening. 10. Female patients must be of non-childbearing potential defined as: * Permanently or surgically sterilised, including hysterectomy and/or bilateral oophorectomy and/or bilateral salpingectomy. * Post-menopausal; aged \<50 years and amenorrhoeic for 12 months or more following cessation of exogenous hormonal treatments and with luteinizing hormone (LH) and follicle stimulating hormone (FSH) levels in the post menopausal range of the local laboratory. * Post-menopausal; aged ≥50 years and amenorrhoeic for 12 months or more, following cessation of all exogenous hormonal treatments. 11. Male patients should use a condom and spermicide to prevent pregnancy and drug exposure of a partner, regardless of the gender or childbearing potential of the partner from the day of the first administration of the IP until 3 months after the last administration of the IP. In addition to a condom with spermicide, a second highly effective method of contraception (oral, intravaginal or transdermal hormonal contraceptives, intrauterine device, intrauterine hormone-releasing system, or sexual abstinence until 3 months after the last administration of the IP) should be used with female partners of childbearing potential. Double barrier methods (a combination of male condom with either a cap, diaphragm or sponge with spermicide) are not considered to be highly effective methods of contraception. Male patients with a pregnant partner should use a condom and spermicide. Exclusion Criteria: 1. Patient has significant diseases other than COPD, (ie, clinically relevant disease or condition or an abnormality in prior ECGs, medical history or physical examinations) which, in the opinion of the Investigator, may put the patient at risk because of participation in the study or may influence either the results of the study or the patient's ability to participate in the study. 2. Patient has alpha-1 antitrypsin deficiency as the cause of COPD. 3. Patient has other active pulmonary disease such as predominant asthma, active tuberculosis, lung cancer, bronchiectasis, sarcoidosis, idiopathic interstitial pulmonary fibrosis, primary pulmonary hypertension, or uncontrolled sleep apnoea. Allergic rhinitis is not exclusionary. 4. Lung surgery for volume reduction or lung transplantation: Patient has undergone lung volume reduction surgery, lobectomy, or bronchoscopic lung volume reduction (endobronchial blockers, airway bypass, endobronchial valves, thermal vapour ablation, biological sealants, massive pulmonary embolism and airway implants) within 1 year of Screening (Visit 1). 5. Patient is using nocturnal positive pressure (eg, continuous positive airway pressure or bi level positive airway pressure). Patient is using any non-invasive positive pressure ventilation device. Note: A patient using continuous positive airway pressure or bi level positive airway pressure for Sleep Apnoea Syndrome is allowed in the study. 6. Patient who had 2 or more exacerbations of COPD (moderate or severe in intensity) within the last year prior to Screening (see Section 7.1 for definition of exacerbation of COPD). 7. Patient has been hospitalised due to poorly controlled COPD within 3 months of the Screening period. 8. Patient has acute worsening of COPD that requires treatment with corticosteroids or antibiotics in the 6 week interval prior to or during the Screening period. 9. Patient has had lower respiratory tract infection(s) that required antibiotics within 6 weeks prior to the Screening period. 10. Patient has significant cardiovascular disease that may be vulnerable to cardiovascular instability. Note: Some examples of clinically significant cardiovascular conditions are: * Myocardial infarction within the 6 months prior to Screening Visit (Visit 1). * Unstable angina or unstable arrhythmia which has required changes in the pharmacological therapy or other intervention within 12 months prior to Screening (Visit 1), or newly diagnosed arrhythmia within the previous 3 months prior to Screening (Visit 1). * Second degree atrio-ventricular block. * Use of pacemaker. * Hospitalisation within 12 months prior to Screening (Visit 1) for heart failure functional classes III (marked limitation of activity and only comfortable at rest) and IV per the "New York Heart Association". 11. Patient with a QT interval corrected using Fridericia's formula (QTcF) value \>450 ms for male and \>470 ms for female or an ECG that is not suitable for QT measurements (eg, poorly defined termination of the T wave). 12. Patient with a heart rate \<50 or \>120 beats per minute (bpm). 13. Patient has clinically significant uncontrolled hypertension (\>180 mmHg) as assessed by the Investigator. 14. Patient has seizures or a history of seizures requiring anticonvulsants within 12 months prior to Screening. 15. Patient is taking selective serotonin reuptake inhibitors or serotonin-norepinephrine reuptake inhibitors whose dose has not been stable for at least 4 weeks prior to Screening, or exceeds the maximum recommended dose. 16. Patient has a symptomatic bladder neck obstruction, acute urinary retention or symptomatic non-stable prostate hypertrophy. 17. Any laboratory abnormality or suspicion of any clinically relevant disease or disorder (on history or examination), including uncontrolled diabetes or hypokalaemia (serum potassium \<3.5 mmol/L), which, in the opinion of the Investigator, may either put the patient at risk because of participation in the study, or influence the results or the patient's ability to participate in the study, or any other safety concerns in the opinion of the Investigator. Note: Potassium replacement and re-test is allowed once if serum potassium concentration was \<3.5 mmol/L at Screening or prior to randomisation. 18. Patient has known human immunodeficiency virus (HIV) infection or chronic hepatitis B or C infection. 19. History of malignancy of any organ system, treated or untreated within the past 5 years, with the exception of localised basal cell carcinoma of the skin. 20. Patient has known narrow-angle glaucoma. 21. Patient has a history of drug of abuse within the past 2 years or consuming more than 14 (female patients) or 21 (male patients) units of alcohol a week, or shows positive for drugs of abuse and alcohol tests at Screening and prior to randomisation. Note: If a patient tests positive to any drugs of abuse tests, which cannot be explained by use of prescription medication, he/she will be excluded from the study. Unit=1 glass of wine (125 mL)=1 measure of spirits=½ pint of beer. 22. Patient has a history of hypersensitivity (including paradoxical bronchospasm) to β2-agonists, muscarinic anticholinergics or lactose/milk protein. Lactose intolerance is not an exclusion criterion. 23. Patient has received a live attenuated vaccination within 30 days prior to Screening. Note: Inactivated influenza vaccination, pneumococcal vaccination, or any other inactivated vaccine is acceptable provided it is not administered within 7 days prior to Screening or randomisation (Visit 3). 24. Patient who, in the opinion of the Investigator, is unable to abstain from protocol-defined prohibited medications during the study. 25. Patient was treated with an investigational drug or device in another clinical trial within the last 30 days or 5 half-lives (whichever is longer) prior to Screening. Note: Patient participation in observational studies (ie, studies that do not require change to medication or an additional intervention) is not exclusionary. 26. Previous participation or prior screen failure in the present study. 27. Involvement in the planning and/or conduct of the study (applies to both AstraZeneca staff and/or staff at the study site). 28. Patient has changed their smoking status (ie, restarted or stopped smoking) or initiation of a smoking cessation program within 6 weeks of Screening. 29. Patient has participated in the acute phase of a pulmonary rehabilitation program within 4 weeks prior to Screening or who will enter the acute phase of a pulmonary rehabilitation program during the study. A patient in the maintenance phase of a pulmonary rehabilitation program is not to be excluded. 30. Judgment by the Investigator that the patient should not participate in the study if the patient is unlikely to comply with study procedures, restrictions and requirements. Inability to comply with requirements includes having an e-Diary completion rate of \<70% during the run-in period. 31. Patient who have donated or lost \>500 mL of blood and/or plasma within the previous 3 months prior to Screening. 32. Vulnerable patients (who has been placed in an institution due to a regulatory or court order).