[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100639649":3},{"organization":4,"armGroups":7,"interventions":14,"overallOfficials":11,"centralContacts":20,"locations":26,"responsibleParty":45,"collaborators":11,"id":49,"slug":11,"hasResults":50,"nctId":51,"briefTitle":52,"officialTitle":53,"acronym":11,"eligibilityCriteria":54,"healthyVolunteers":50,"sex":55,"minAge":56,"maxAge":57,"enrollmentInfo":58,"targetDuration":11,"studyType":61,"phases":62,"briefSummary":64,"conditions":65,"keywords":70,"overallStatus":74,"whyStopped":11,"lastUpdateSubmitDate":75,"lastUpdatePostDateStruct":76,"startDateStruct":79,"completionDateStruct":81,"leadSponsor":83,"locationsCount":84},{"fullName":5,"class":6},"Zhongshan Ophthalmic Center, Sun Yat-sen University","OTHER",[8],{"label":9,"type":10,"description":11,"interventionNames":12},"Alfentanil Sequential Dose Group","EXPERIMENTAL",null,[13],"Drug: Alfentanil",[15],{"type":16,"name":17,"description":18,"armGroupLabels":19,"otherNames":11},"DRUG","Alfentanil","All patients receive 2.5 mg\u002Fkg propofol injected over 30 seconds. Alfentanil is administered 1 minute prior to propofol. The dose is adjusted by steps of 2 µg\u002Fkg based on the previous patient's response (successful insertion = decrease dose; failed insertion = increase dose).",[9],[21],{"name":22,"role":23,"phone":24,"phoneExt":11,"email":25},"Rui Zhang, M.D.","CONTACT","+86 15802025520","zhangr52@mail.sysu.edu.cn",[27],{"facility":28,"status":11,"city":29,"state":30,"zip":31,"country":32,"countryCode":33,"cosmosGeoPoint":34,"geoPoint":39,"contacts":40},"Department of Anesthesiology, Zhongshan Ophthalmic Center, Sun Yat-sen University","Guangzhou","Guangdong","510000","China","CN",{"type":35,"coordinates":36},"Point",[37,38],113.25,23.11667,{"lat":38,"lon":37},[41],{"name":42,"role":23,"phone":43,"phoneExt":11,"email":44},"Tairan Lin, M.D.","+86 15622130745","talonlam@foxmail.com",{"type":46,"investigatorFullName":47,"investigatorTitle":48,"investigatorAffiliation":5,"oldNameTitle":11,"oldOrganization":11},"PRINCIPAL_INVESTIGATOR","Rui Zhang","Associate Chief Physician","100639649",false,"NCT07581665","Effective Dose of Alfentanil Combined With Propofol for Laryngeal Mask Airway Insertion in Children","Effective Dose of Alfentanil Combined With Propofol for Laryngeal Mask Airway Insertion in Children: A Prospective, Up-and-Down Sequential Allocation Study","Inclusion Criteria:\n\n* Aged 7 to 12 years\n* Undergoing elective day surgery\n* ASA physical status I-II\n* Body Mass Index (BMI) between 14 and 24 kg\u002Fm²\n* Accompanied by a fully capable guardian within 24 hours after discharge\n\nExclusion Criteria:\n\n* Allergy to opioids\n* Unresolved upper respiratory tract infection within the past 1 week\n* Abnormal heart, lung, liver, or kidney function, or metabolic diseases\n* Airway anatomical abnormalities (e.g., micrognathia, laryngomalacia, macroglossia) or OSAHS (Obstructive Sleep Apnea-Hypopnea Syndrome)\n* Use of analgesics, sedatives, or other psychotropic drugs within the past 2 weeks\n* Refusal to sign the informed consent form","ALL","7 Years","12 Years",{"count":59,"type":60},40,"ESTIMATED","INTERVENTIONAL",[63],"PHASE4","This study uses a prospective, up-and-down sequential allocation method to determine the median effective dose (ED50) and 95% effective dose (ED95) of alfentanil combined with propofol for successful laryngeal mask airway (LMA) insertion in children aged 7-12 undergoing elective day surgery.",[66,67,68,69],"Pediatric Anesthesia","Airway Management","General Anesthesia","LMA",[17,71,66,69,72,73],"Propofol","Dixon Method","Effective dose","NOT_YET_RECRUITING","2026-05-05",{"date":77,"type":78},"2026-05-12","ACTUAL",{"date":80,"type":60},"2026-05-01",{"date":82,"type":60},"2027-03-30",{"name":5,"class":6},1]