[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-studies-list:{\"conditionNormalized\":\"upper-airway-obstruction\",\"overallStatus\":[\"RECRUITING\",\"AVAILABLE\",\"NOT_YET_RECRUITING\"],\"orderBy\":\"LastUpdateSubmitDate:desc\",\"size\":25,\"offset\":0}":3,"health-study-condition:upper-airway-obstruction":30},{"pageToken":4,"total":5,"offset":6,"count":5,"results":7},null,2,0,[8,43],{"id":9,"slug":10,"hasResults":11,"nctId":12,"briefTitle":13,"officialTitle":13,"acronym":4,"eligibilityCriteria":14,"healthyVolunteers":15,"sex":16,"minAge":17,"maxAge":4,"enrollmentInfo":18,"targetDuration":21,"studyType":22,"phases":4,"briefSummary":23,"conditions":24,"keywords":4,"overallStatus":31,"whyStopped":4,"lastUpdateSubmitDate":32,"lastUpdatePostDateStruct":33,"startDateStruct":36,"completionDateStruct":38,"leadSponsor":40,"locationsCount":4},"100643772","a-study-to-evaluate-the-diagnostic-performance-of-portable-oscillometry-across-chronic-respiratory-diseases-100643772",false,"NCT07631507","A Study to Evaluate the Diagnostic Performance of Portable Oscillometry Across Chronic Respiratory Diseases","Inclusion Criteria:\n\n* COPD group:\n\n  * Age：≥40\n  * Suspected COPD：COPD-SQ≥16，and no evidence of airflow limitation after bronchodilators\n  * Confirmed COPD：According to the diagnostic criteria in the 2021 Revised Edition of the Chinese Guidelines for the Diagnosis and Treatment of Chronic Obstructive Pulmonary Disease and the 2026 GOLD Report, a diagnosis requires the presence of symptoms (such as dyspnea, chronic cough, or sputum production), a history of exposure to risk factors (e.g., smoking, biomass fuels, occupational exposures, or air pollution), evidence of persistent airflow limitation (post-bronchodilator FEV1\u002FFVC \\\u003C 0.70), and the exclusion of alternative diagnoses.\n  * Exclude acute exacerbation within the last month Asthma group：\n  * Age：≥3\n  * Suspected asthma：Patients with chronic respiratory symptoms but no evidence of variable airflow limitation\n  * Confirmed asthma：According to the diagnostic criteria in the 2024 Chinese Guidelines for the Prevention and Treatment of Bronchial Asthma and the 2025 GINA Report, diagnosis requires the presence of recurrent symptoms (such as wheezing, shortness of breath, chest tightness, and cough) that resolve spontaneously or with treatment; evidence of variable airflow limitation (e.g., a positive bronchodilator reversibility test, a positive bronchial provocation test, or an average daily diurnal PEF variability of \\>10% over at least 7 consecutive days); and the exclusion of alternative diagnoses.\n\nHealthy subjects:\n\n* Age ≥ 3 (See Table 1 for details)\n* No respiratory symptoms（cough, expectoration, shortness of breath, wheezing, etc）\n* No history of serious cardiopulmonary or other systemic diseases, especially no history of respiratory diseases and surgery\n* No history of respiratory infection within the past 4 weeks; non-smoker or total lifetime smoking \\\u003C 100 cigarettes\n* No history of occupational exposure to harmful gases or dust, or serious pollution of the work or living environment\n* No abnormalities on chest physical examination\n* No abnormalities were found on chest imaging (X-ray, CT) records within the past year.\n* Body mass index within the normal range (18.5\\~24.9) Confirmed Bronchiectasis Group：\n* Age ≥ 3 years\n* Clinical history consistent with bronchiectasis, confirmed by CT scan\n* No other concurrent or accompanying respiratory diseases at present Confirmed ILD Group：\n* Age ≥ 3 years\n* Fibrotic interstitial lung disease: HRCT scan shows fibrotic lung disease, defined as reticular abnormalities and traction bronchiectasis with or without honeycombing, and the disease extent \\> 10%; or lung tissue biopsy indicates fibrotic interstitial changes\n* No other concurrent or accompanying respiratory diseases at present Confirmed Upper Airway Obstruction Group：\n* Age ≥ 3 years, gender not restricted\n* History of upper airway inflammation, injury, endotracheal intubation or tracheotomy, burns, foreign body aspiration, tracheal tumor, or other conditions that can cause large airway obstruction\n* Clinical manifestations are mainly dyspnea and shortness of breath, which are significantly aggravated after activity, and sometimes symptom exacerbation is related to body position\n* Pulmonary function test shows significant limitation of inspiratory or expiratory flow in the F-V curve, presenting a characteristic plateau pattern\n* At least one of the following evidences: chest CT scan or upper airway three-dimensional reconstruction confirms upper airway stenosis; laryngoscopy or bronchoscopy reveals tracheal\u002Fbronchial wall thickening and\u002For stenosis, intratracheal nodules or neoplasms, tumor infiltration, tracheal mucosal congestion, tracheal cartilage collapse, etc\n\nExclusion Criteria:\n\n* • Contraindications for oscillometry testing and spirometry testing: Oscillometry testing: Severe and intolerable dyspnea, acute exacerbation of respiratory infection, uncontrolled epilepsy, oral or facial diseases or deformities preventing proper latching, tympanic membrane perforation, need for continuous oxygen therapy, indwelling gastric tube, tracheotomy with inability to close the tube, currently undergoing artificial ventilation and unable to temporarily stop the procedure; Spirometry testing: Recent severe cardiovascular disease, epileptic seizures, uncontrolled hypertension, aortic aneurysm, severe hyperthyroidism, heart rate \\>120 bpm, tympanic membrane perforation, other respiratory infectious diseases, etc.;\n\n  * Other respiratory diseases that affect lung function results： such as lung cancer, pneumonia, active pulmonary tuberculosis, pulmonary embolism, etc.; Recent surgical history that affects lung function results, including open-chest surgery, pleural effusion surgery, etc.;\n  * Poor cooperation during basic lung function tests, failing to meet quality control requirements;\n  * Breastfeeding women;\n  * Participants deemed unlikely by the researcher to comply with research procedures and restrictions.",true,"ALL","3 Years",{"count":19,"type":20},4000,"ESTIMATED","1 Day","OBSERVATIONAL","This is a prospective, multicenter, observational cohort study enrolling approximately 4,000 subjects across about 50 centers, including patients with COPD (confirmed and suspected), asthma (confirmed and suspected), bronchiectasis, interstitial lung disease (ILD), upper airway obstruction (UAO), and healthy controls. Participants will undergo standardized clinical assessments, cough search, FENO, ETCO2, impulse oscillometry, spirometry, and\u002For bronchodilator test, and\u002For bronchoprovocation test, and\u002For diffusion capacity test at a single baseline visit, with no investigational intervention or treatment assignment. The primary objective is to evaluate the diagnostic performance of portable impulse oscillometry in Chronic respiratory diseases and to develop an artificial intelligence diagnostic model for COPD based on oscillometry. The study duration per subject is limited to the screening\u002Fbaseline visit, with no follow-up visits planned.",[25,26,27,28,29,30],"COPD","Asthma (Diagnosis)","Chronic Respiratory Diseases","Bronchiectasis","Interstitial Lung Disease (ILD)","Upper Airway Obstruction","NOT_YET_RECRUITING","2026-06-02",{"date":34,"type":35},"2026-06-08","ACTUAL",{"date":37,"type":20},"2026-07-30",{"date":39,"type":20},"2027-08-30",{"name":41,"class":42},"The First Affiliated Hospital of Guangzhou Medical University","OTHER",{"id":44,"slug":45,"hasResults":11,"nctId":46,"briefTitle":47,"officialTitle":48,"acronym":4,"eligibilityCriteria":49,"healthyVolunteers":11,"sex":16,"minAge":50,"maxAge":51,"enrollmentInfo":52,"targetDuration":4,"studyType":54,"phases":55,"briefSummary":57,"conditions":58,"keywords":60,"overallStatus":64,"whyStopped":4,"lastUpdateSubmitDate":65,"lastUpdatePostDateStruct":66,"startDateStruct":68,"completionDateStruct":69,"leadSponsor":71,"locationsCount":74},"100626014","flow-controlled-versus-volume-controlled-ventilation-during-balloon-dilatation-under-direct-laryngoscopy-100626014","NCT07430124","Flow-Controlled Versus Volume-Controlled Ventilation During Balloon Dilatation Under Direct Laryngoscopy","Comparison of Flow-Controlled and Volume-Controlled Ventilation During Balloon Dilatation Under Direct Laryngoscopy: A Prospective Randomized Trial","Inclusion Criteria:\n\n* Age between 18 and 65 years\n* ASA physical status I-III\n\nExclusion Criteria:\n\n* Age \\\u003C 18 years or \\> 65 years\n* Known or previously diagnosed pulmonary disease\n* Patients with severe preoperative pulmonary function impairment (e.g., FEV₁ \\\u003C 50% predicted, severe restrictive or obstructive pathology)\n* Patients with markedly altered lung anatomy or function due to prior major thoracic surgery\n* Patients who were dependent on supplemental oxygen therapy in the preoperative period\n* ASA physical status IV or higher\n* Refusal or inability to provide informed consent","18 Years","65 Years",{"count":53,"type":20},40,"INTERVENTIONAL",[56],"NA","This prospective trial aims to compare the effects of flow-controlled ventilation (FCV) and volume-controlled ventilation (VCV) on airway pressures and oxygenation in adult patients undergoing balloon dilatation under direct laryngoscopy. Airway procedures performed under general anesthesia are associated with unique respiratory mechanics and limited ventilation conditions, making the choice of an optimal ventilation strategy particularly important.\n\nAdult patients aged 18-65 years with American Society of Anesthesiologists (ASA) physical status I-III will be allocated to receive either FCV or VCV during surgery. Ventilatory parameters, airway pressures, pulmonary compliance, and arterial blood gas values will be recorded at predefined intraoperative time points. The primary outcome is the PaO₂ measured 20 minutes under an FiO₂ of 0.8-1.0 after starting the ventilation under general anesthesia, reflecting early intraoperative oxygenation under stable conditions.\n\nBy providing comparative data on respiratory mechanics and oxygenation, this study aims to contribute to the identification of lung-protective ventilation strategies in patients undergoing balloon dilatation under direct laryngoscopy.",[59,30],"Airway Stenosis",[61,62,63],"Direct Laryngoscopy","Flow-Controlled Ventilation","Volume-Controlled Ventilation","RECRUITING","2026-02-24",{"date":67,"type":35},"2026-02-25",{"date":65,"type":35},{"date":70,"type":20},"2026-08-20",{"name":72,"class":73},"Ankara Etlik City Hospital","OTHER_GOV",1]