| Completed | Effect of Recruitment Maneuver on Postoperative Atelectasis Assessed by Lung Ultrasound in Laparoscopic Cholec NCT07324122 | Fatih Sultan Mehmet Training and Research Hospital | — |
| Recruiting | Ultrasound for Postop Lung Issues in Low-Flow Anesthesia NCT06824506 | Ankara Ataturk Sanatorium Training and Research Hospital | — |
| Recruiting | Positive Pressure Therapy to Optimize LUNG Function After Heart Surgery NCT06611527 | Federal University of São Paulo | N/A |
| Completed | The Incidence of Post-Operative Lung Atelectasis With Erector Spinae Plane Block in Bariatric Surgery: NCT06695858 | Kasr El Aini Hospital | Phase 3 |
| Withdrawn | Preoperative Optimization to Improve Functional Status NCT04566172 | Johns Hopkins University | N/A |
| Completed | Atelectasis Frequency in Different Ventilation Modes NCT06430229 | Ankara Etlik City Hospital | N/A |
| Recruiting | Effects of Individualized PEEP Guided by Driving Pressure on Postoperative Atelectasis in Patients With Morbid NCT06181279 | Yongtao Sun | N/A |
| Unknown | High-flow Nasal Oxygenation During Preoxygenation and Atelectasis NCT06205212 | Seoul National University Hospital | N/A |
| Completed | Effects of Different Oxygen Concentrations on Lung Ultrasound Score During Spontaneous Ventilation NCT05850988 | Diskapi Teaching and Research Hospital | N/A |
| Unknown | Use of Airway Pressure Release Ventilation in Morbidly Obese Patients Undergoing Open Heart Surgery NCT05670483 | Ain Shams University | N/A |
| Completed | The Effects of Pre-extubation Single Recruitment Maneuver on Perioperative Atelectasis NCT05494255 | Istanbul University | N/A |
| Unknown | QT Distance and P Dispersion in ECG in Patients Having Bronchoscopy in the ICU NCT05434624 | Abant Izzet Baysal University | N/A |
| Completed | Impact of an Open Lung Extubation Strategy on Postoperative Pulmonary Complications NCT04993001 | Centre hospitalier de l'Université de Montréal (CHUM) | N/A |
| Completed | poStoperative Anesthesia Care: Facial Mask vs Hfnc and Thoracic Ultrasound for Reduction of Atelectasis Incide NCT04566419 | Fondazione Policlinico Universitario Agostino Gemelli IRCCS | N/A |
| Completed | Paravertebral Block Versus Erector Spinae Plane Block for Modified Radical Mastectomy in Womens. NCT03614091 | Assiut University | N/A |
| Unknown | A Comparative Study Between Regional Anesthesia in Thoracoscopes and the Conventional General Anesthesia NCT05077111 | Mohamed Reda Ashour | Phase 4 |
| Completed | The Digital Incentive Spirometer (DIS): Improving Adherence to Incentive Spirometry NCT03686631 | Beth Israel Deaconess Medical Center | N/A |
| Withdrawn | Ventilation During Cardiopulmonary Bypass (CPB) for Cardiac Surgery NCT02070445 | McMaster University | — |
| Completed | HFNC During Awake Craniotomy - Impact on Patient Comfort NCT03763461 | Western University, Canada | N/A |
| Completed | Lung Ultrasonography After Laparoscopic Gynecologic Surgery NCT04116567 | SONNINO CHIARA | — |
| Completed | Ultrasound-guided Alveolar Recruitment in Laparoscopic Gynecological Surgery NCT03607240 | Seoul National University Hospital | N/A |
| Unknown | Effects of PEEP on Heart and Lungs in Obese Subjects NCT02523352 | Massachusetts General Hospital | N/A |
| Withdrawn | Expressions of TRPV1 in Airway of Asthmatics NCT02952066 | Lu Yuan Lee | N/A |
| Completed | Descriptive and Comparative Study of Respiratory Function in the Postoperative Cardiac Surgery Patient NCT03009331 | Sahlgrenska University Hospital | N/A |
| Completed | Fraction of Inspired Oxygen and Atelectasis in Children NCT02870842 | Seoul National University Hospital | N/A |
| Completed | Prevalence of Atelectasis in Critical Trauma Patients NCT02739854 | Khon Kaen University | — |
| Unknown | Open Lung Strategy in Critically Ill Morbid Obese Patients NCT02503241 | Massachusetts General Hospital | N/A |
| Completed | Preload Dependency Evaluation With Stroke Volume Variation During Alveolar Recruitment Manoeuvres NCT02678559 | University Hospital, Clermont-Ferrand | N/A |
| Completed | Lung Ultrasound and Alveolar Recruitment in Mechanically Ventilated Infants NCT02584023 | Seoul National University Hospital | N/A |
| Unknown | Atelectasis Formation: Role of Positive Pressure Breathing, Hyperoxia, and Hypobaria NCT03311347 | Direction Centrale du Service de Santé des Armées | N/A |
| Completed | The Effect of Postoperative Incentive Spirometry on Pulmonary Function and Pulmonary Complications in Bariatri NCT02431455 | Lahey Clinic | N/A |
| Completed | Ventilator Hyperinflation and Manual Rib Cage Compression NCT03630484 | Brazilian Institute of Higher Education of Censa | N/A |
| Completed | Interest of Positive Expiratory Pressure (PEP) Delivery by EzPAP® After Cardiac Surgery in the Management of P NCT02262182 | Nantes University Hospital | N/A |
| Completed | Optimizing Intraoperative Mechanical Ventilation Using EIT-titrated PEEP NCT02314845 | University of Sao Paulo General Hospital | N/A |
| Completed | Application Breathing Exercises With Load Inspiratory Postoperative Abdominal Surgery NCT02298517 | Universidade Metodista de Piracicaba | N/A |
| Completed | Influence of Different Physical Therapy Resources Application After Reduction Stomach Surgery NCT01872663 | Universidade Metodista de Piracicaba | N/A |
| Withdrawn | Ventilation Strategy Reduces Postoperative Atelectasis NCT01911923 | Region Västmanland | N/A |
| Completed | Respiratory Complications After Laparoscopic Surgery NCT01476254 | Herlev Hospital | — |
| Completed | Use of Positive Pressure in Morbidly Obese Patients Undergoing Reduction Stomach Surgery NCT01786681 | Universidade Metodista de Piracicaba | N/A |
| Unknown | Atelectasis After Pulmonary Lobectomy: The Effect Of Air During One-Lung Ventilation (OLV) On Postoperative At NCT01289691 | London Health Sciences Centre | N/A |