[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100633591":3},{"organization":4,"armGroups":7,"interventions":14,"overallOfficials":10,"centralContacts":20,"locations":26,"responsibleParty":41,"collaborators":10,"id":45,"slug":46,"hasResults":47,"nctId":48,"briefTitle":49,"officialTitle":50,"acronym":10,"eligibilityCriteria":51,"healthyVolunteers":47,"sex":52,"minAge":53,"maxAge":54,"enrollmentInfo":55,"targetDuration":10,"studyType":58,"phases":10,"briefSummary":59,"conditions":60,"keywords":65,"overallStatus":78,"whyStopped":10,"lastUpdateSubmitDate":79,"lastUpdatePostDateStruct":80,"startDateStruct":83,"completionDateStruct":85,"leadSponsor":87,"locationsCount":88},{"fullName":5,"class":6},"Fatih Sultan Mehmet Training and Research Hospital","OTHER",[8],{"label":9,"type":10,"description":11,"interventionNames":12},"Obese Patients Undergoing General Anesthesia",null,"Adult obese patients (BMI \\>30 kg\u002Fm², aged 18-65 years, ASA I-III) scheduled for elective surgery requiring orotracheal intubation under general anesthesia. Preoperative airway assessment will include conventional parameters (Mallampati score, neck circumference, STOP-BANG scale) and airway ultrasonographic measurements (distance from skin to hyoid bone \\[DSHB\\] and hyomental distance ratio \\[HMDR\\]). Standard anesthesia induction will be performed with propofol 2 mg\u002Fkg, fentanyl 2 mcg\u002Fkg, and rocuronium 0.6 mg\u002Fkg. Mask ventilation difficulty will be graded using the Han Scale and laryngoscopy difficulty using the Cormack-Lehane classification. Anesthesia will be maintained with sevoflurane and remifentanil infusion targeting BIS 40-60.",[13],"Diagnostic Test: Airway Ultrasonography",[15],{"type":16,"name":17,"description":18,"armGroupLabels":19,"otherNames":10},"DIAGNOSTIC_TEST","Airway Ultrasonography","Preoperative airway ultrasonography will be performed by a trained anesthesiologist using a linear ultrasound probe with the patient in the supine position and head in neutral position. The following measurements will be obtained: (1) minimum distance from skin to hyoid bone (DSHB) at the transverse view of the hyoid bone level, (2) anterior neck soft tissue thickness at the thyrohyoid membrane level, and (3) hyomental distance ratio (HMDR), calculated as the ratio of hyomental distance in full extension (HMDe) to hyomental distance in neutral position (HMDn). These ultrasonographic parameters will be correlated with intraoperative Cormack-Lehane laryngoscopy grade and Han Scale mask ventilation score to assess their predictive value for difficult airway in obese patients.",[9],[21],{"name":22,"role":23,"phone":24,"phoneExt":10,"email":25},"Emin Mert Koyutürk, MD","CONTACT","+905362403394","mertkytrk@gmail.com",[27],{"facility":5,"status":10,"city":28,"state":10,"zip":10,"country":29,"countryCode":10,"cosmosGeoPoint":30,"geoPoint":35,"contacts":36},"Istanbul","Turkey (Türkiye)",{"type":31,"coordinates":32},"Point",[33,34],28.94966,41.01384,{"lat":34,"lon":33},[37],{"name":38,"role":23,"phone":39,"phoneExt":10,"email":40},"cansu ofluoglu, MD","+905358640564","cansuakin.iu@gmail.com",{"type":42,"investigatorFullName":43,"investigatorTitle":44,"investigatorAffiliation":5,"oldNameTitle":10,"oldOrganization":10},"PRINCIPAL_INVESTIGATOR","emin mert koyuturk","Anesthesiologist, Principal Investigator","100633591","ultrasound-vs-clinical-parameters-for-difficult-airway-prediction-in-obesity-100633591",false,"NCT07528677","Ultrasound vs Clinical Parameters for Difficult Airway Prediction in Obesity","Comparison of Airway Ultrasonography and Conventional Difficult Airway Parameters for Predicting Difficult Airway in Obese Patients: A Prospective Observational Study","Inclusion Criteria:\n\n* Age 18-65 years\n* BMI \\>30 kg\u002Fm2\n* ASA physical status I, II, or III\n* Scheduled for elective surgery requiring orotracheal intubation under general anesthesia\n* Written informed consent obtained\n\nExclusion Criteria:\n\n* Emergency surgery\n* History of previous head and neck surgery or radiotherapy\n* Known or anticipated difficult airway (history of difficult intubation)\n* Presence of cervical spine pathology or limited neck mobility\n* Presence of oropharyngeal or laryngeal pathology\n* Pregnancy\n* Patients with tracheostomy\n* Refusal to participate","ALL","18 Years","65 Years",{"count":56,"type":57},70,"ESTIMATED","OBSERVATIONAL","Obesity is associated with anatomical changes in the upper airway that increase the risk of difficult laryngoscopy and difficult mask ventilation during anesthesia. Conventional airway assessment parameters such as Mallampati score, neck circumference, and STOP-BANG scale are widely used but have limited predictive accuracy in obese patients. Airway ultrasonography has emerged as a promising non-invasive tool for difficult airway prediction; however, ultrasonographic criteria have not yet been standardized.\n\nThis prospective observational study aims to evaluate the utility of airway ultrasonography in predicting difficult airway in adult obese patients (BMI \\>30 kg\u002Fm²) scheduled for elective surgery under general anesthesia. Ultrasonographic measurements will include the distance from skin to hyoid bone (DSHB) at the level of the hyoid bone, the anterior neck soft tissue thickness at the thyrohyoid membrane level, and the hyomental distance ratio (HMDR). These parameters will be compared with conventional airway assessment tools and correlated with intraoperative Cormack-Lehane laryngoscopy grade and Han Scale mask ventilation score to determine their predictive value for difficult airway.",[61,62,63,64],"Obesity (BMI > 35)","Difficult Airway","Difficult Airway Intubation","Difficult Mask Ventilation",[66,67,68,69,70,71,72,73,74,75,76,77],"Airway ultrasonography","Difficult airway prediction","Obese patients","Cormack-Lehane classification","Han Scale","Hyomental distance ratio","Distance from skin to hyoid bone","Neck circumference","Mallampati score","STOP-BANG scale","General anesthesia","Orotracheal intubation","NOT_YET_RECRUITING","2026-04-09",{"date":81,"type":82},"2026-04-14","ACTUAL",{"date":84,"type":57},"2026-04-10",{"date":86,"type":57},"2026-11",{"name":5,"class":6},1]