| Suspended | Clinical Trial of a Rehabilitation Device Based on Electrostimulation for Obstructive Sleep Apnoea NCT04607343 | Fundación Neumologica Colombiana | N/A |
| Unknown | A Brief Lifestyle Modification Programme in Overweight Subjects With Obstructive Sleep Apnoea - Needs Assessme NCT04262986 | The University of Hong Kong | — |
| Completed | Developing a Non-contact Sleep Apnoea Detector, Suitable for Home Studies- The Safescan Study NCT04071860 | Papworth Hospital NHS Foundation Trust | — |
| Withdrawn | Biomarker for Pompe Disease (BioPompe) NCT01457443 | CENTOGENE GmbH Rostock | — |
| Withdrawn | Biomarker for Maroteaux-Lamy Disease (BioMaroteaux) NCT01458613 | CENTOGENE GmbH Rostock | — |
| Completed | Obstructive Sleep Apnoea in Patients With Type 1 Diabetes NCT03481361 | University of Birmingham | — |
| Completed | Investigating the Neuropathology of Obstructive Sleep Apnoea NCT02967536 | King's College London | — |
| Completed | PAIR Study-PAP And IOP Relationship: Study 2 NCT03145129 | Papworth Hospital NHS Foundation Trust | — |
| Terminated | PAIR Study-PAP And IOP Relationship: Study 1 NCT03127813 | Papworth Hospital NHS Foundation Trust | N/A |
| Terminated | Morphine in Moderate Obstructive Sleep Apnoea NCT03127800 | Papworth Hospital NHS Foundation Trust | Phase 3 |
| Completed | Drug-Induced Sleep Endoscopy for the Optimisation of Treatment of Patients With Obstruction Sleep Apnoea NCT02855515 | University Hospital Ostrava | N/A |
| Completed | Comparison of Two Continuous Positive Airway Pressure Systems NCT02535234 | ResMed | N/A |
| Completed | Prevalence of Obstructive Sleep Apnoea in Glaucoma NCT02713152 | Papworth Hospital NHS Foundation Trust | — |
| Completed | EndoBarrier in Obstructive Sleep Apnoea Study NCT06376305 | Dr Bob Ryder | N/A |
| Completed | STOPBANG As A Screening Tool for Obstructive Sleep Apnoea in Pregnancy NCT02542488 | City Hospitals Sunderland NHS Foundation Trust | — |
| Completed | Leg Fluid Shift in Patients With Chronic Heart Failure and Obstructive or Central Sleep Apnea NCT03092388 | Heart and Diabetes Center North-Rhine Westfalia | N/A |
| Completed | Antioxidant Carbocysteine Treatment in Obstructive Sleep Apnoea Syndrome NCT02015598 | Guangzhou Institute of Respiratory Disease | N/A |
| Unknown | The SAD Study - SLEEP, ANXIETY & DEPRESSION Study A Prospective Cohort Study NCT01985347 | The Queen Elizabeth Hospital | N/A |
| Completed | Continuous Transcutaneous Electrical Stimulation in Sleep Apnoea NCT01661712 | Guy's and St Thomas' NHS Foundation Trust | N/A |
| Completed | Randomized-controlled Trial (RCT) on CPAP-withdrawal and Microvascular Function in OSA NCT01797653 | University of Zurich | N/A |
| Completed | Effect of Liraglutide in Obese Subjects With Moderate or Severe Obstructive Sleep Apnoea: SCALE™ - Sleep Apnoe NCT01557166 | Novo Nordisk A/S | Phase 3 |
| Unknown | To Investigate the Incidence of Obstructive Sleep Apnoea in Patient Undergoing Open Heart Surgery NCT01829854 | University of Malaya | — |
| Completed | Peripheral Vascular Function in Obstructive Sleep Apnoea NCT01619748 | Sheffield Teaching Hospitals NHS Foundation Trust | — |
| Terminated | Clinical Trial of Desmopressin on Nocturia in Obstructive Sleep Apnoea Patients NCT01530451 | Chinese University of Hong Kong | Phase 3 |
| Unknown | Ambulatory Versus Home Blood Pressure Monitoring in Obstructive Sleep Apnea NCT01685736 | University of Athens | — |
| Completed | Dose-range Finding Study of BF2.649 Effect on Patients With Obstructive Sleep Apnea (OSA) NCT01620554 | Bioprojet | Phase 2 |
| Completed | Obstructive Sleep Apnoea and Adipose Tissue Dysfunction NCT02518633 | Royal Devon and Exeter NHS Foundation Trust | — |
| Completed | Lifestyle Intervention in Obstructive Sleep Apnoea NCT01546792 | Sheffield Teaching Hospitals NHS Foundation Trust | Phase 2 / Phase 3 |
| Completed | Efficacy of PAP Therapy on Blood Pressure NCT02417584 | University of Crete | N/A |
| Completed | The Effect of the Mediterranean Diet on Obstructive Sleep Apnoea-Hypopnoea Syndrome: A Randomised Trial NCT01312558 | University of Crete | N/A |
| Completed | Effect of Continuous Positive Airway Pressure (CPAP) on Systemic Blood Pressure, Coagulability and Carotid Int NCT00300599 | Chinese University of Hong Kong | N/A |
| Completed | The Use of Oral Appliances as an Adjunct to Continuous Positive Airway Pressure (CPAP) in the Treatment of Obs NCT00358605 | University of British Columbia | N/A |
| Completed | Dynamic Alterations of Tongue in Sleep Apnoea Hypopnea Syndrome During Sleep NCT01687855 | Wenzhou Medical University | — |