[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100646037":3},{"organization":4,"armGroups":7,"interventions":10,"overallOfficials":21,"centralContacts":25,"locations":34,"responsibleParty":51,"collaborators":10,"id":54,"slug":55,"hasResults":56,"nctId":57,"briefTitle":58,"officialTitle":59,"acronym":10,"eligibilityCriteria":60,"healthyVolunteers":56,"sex":61,"minAge":62,"maxAge":10,"enrollmentInfo":63,"targetDuration":10,"studyType":66,"phases":10,"briefSummary":67,"conditions":68,"keywords":71,"overallStatus":76,"whyStopped":10,"lastUpdateSubmitDate":77,"lastUpdatePostDateStruct":78,"startDateStruct":81,"completionDateStruct":83,"leadSponsor":85,"locationsCount":86},{"fullName":5,"class":6},"Tongji Hospital","OTHER",[8,12,15,18],{"label":9,"type":10,"description":11,"interventionNames":10},"T11-T12",null,"On operating room admission, after providing written informed consent for anesthesia, patients underwent standard monitoring (ECG, NIBP, pulse oximetry). Baseline demographic and anthropometric data, including hospital admission ID, sex, height, and weight, were recorded, and body mass index (BMI) was calculated. After positioning in the lateral decubitus position, the T11-T12 interspace was selected for puncture using a midline approach, and the loss-of-resistance technique confirmed epidural space entry. Puncture depth (skin-to-epidural space) was recorded from needle shaft markings to the nearest 0.1 cm.",{"label":13,"type":10,"description":14,"interventionNames":10},"T12-L1","On operating room admission, after providing written informed consent for anesthesia, patients underwent standard monitoring (ECG, NIBP, pulse oximetry). Baseline demographic and anthropometric data, including hospital admission ID, sex, height, and weight, were recorded, and body mass index (BMI) was calculated. After positioning in the lateral decubitus position, the T12-L1 interspace was selected for puncture using a midline approach, and the loss-of-resistance technique confirmed epidural space entry. Puncture depth (skin-to-epidural space) was recorded from needle shaft markings to the nearest 0.1 cm.",{"label":16,"type":10,"description":17,"interventionNames":10},"L1-L2","On operating room admission, after providing written informed consent for anesthesia, patients underwent standard monitoring (ECG, NIBP, pulse oximetry). Baseline demographic and anthropometric data, including hospital admission ID, sex, height, and weight, were recorded, and body mass index (BMI) was calculated. After positioning in the lateral decubitus position, the L1-L2 interspace was selected for puncture using a midline approach, and the loss-of-resistance technique confirmed epidural space entry. Puncture depth (skin-to-epidural space) was recorded from needle shaft markings to the nearest 0.1 cm.",{"label":19,"type":10,"description":20,"interventionNames":10},"L2-L3","On operating room admission, after providing written informed consent for anesthesia, patients underwent standard monitoring (ECG, NIBP, pulse oximetry). Baseline demographic and anthropometric data, including hospital admission ID, sex, height, and weight, were recorded, and body mass index (BMI) was calculated. After positioning in the lateral decubitus position, the L2-L3 interspace was selected for puncture using a midline approach, and the loss-of-resistance technique confirmed epidural space entry. Puncture depth (skin-to-epidural space) was recorded from needle shaft markings to the nearest 0.1 cm.",[22],{"name":23,"affiliation":5,"role":24},"Hongbo Zheng, MM","PRINCIPAL_INVESTIGATOR",[26,30],{"name":23,"role":27,"phone":28,"phoneExt":10,"email":29},"CONTACT","+8618040544926","zheng1283@163.com",{"name":31,"role":27,"phone":32,"phoneExt":10,"email":33},"Hong Chen Chen, MM","17786127071","2010tj0573@hust.edu.cn",[35],{"facility":36,"status":10,"city":37,"state":38,"zip":39,"country":40,"countryCode":41,"cosmosGeoPoint":42,"geoPoint":47,"contacts":48},"Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology","Wuhan","Hubei","430030","China","CN",{"type":43,"coordinates":44},"Point",[45,46],114.26667,30.58333,{"lat":46,"lon":45},[49,50],{"name":23,"role":27,"phone":28,"phoneExt":10,"email":29},{"name":10,"role":27,"phone":10,"phoneExt":10,"email":29},{"type":24,"investigatorFullName":52,"investigatorTitle":53,"investigatorAffiliation":5,"oldNameTitle":10,"oldOrganization":10},"Hongbo Zheng","Attending Physician","100646037","predictors-of-epidural-depth-in-percutaneous-nephrolithotomy-and-model-development-100646037",false,"NCT07697053","Predictors of Epidural Depth in Percutaneous Nephrolithotomy and Model Development","Analysis of Factors Influencing Epidural Depth in Patients Undergoing Percutaneous Nephrolithotomy and Development of a Predictive Model","Inclusion Criteria:\n\n* Age ≥ 18 years\n* Successful epidural puncture and catheter placement using the midline approach\n* Clear documentation of puncture level and puncture depth in the anesthesia record\n\nExclusion Criteria:\n\n* Dural puncture during anesthesia (including those who subsequently had a successful repuncture)\n* Use of the paramedian approach for epidural puncture\n* Uncertain epidural anesthesia effect requiring combined general anesthesia\n* Incomplete clinical data","ALL","18 Years",{"count":64,"type":65},3278,"ESTIMATED","OBSERVATIONAL","Accurate estimation of epidural depth is critical for safe epidural anesthesia during percutaneous nephrolithotomy (PCNL). Although various imaging modalities can predict epidural depth, they increase healthcare burden and are not always feasible in emergency or bedside settings. Identifying simple, easily obtainable clinical parameters-such as sex, age, and body mass index (BMI)-for predicting epidural depth has become a research priority. However, systematic investigations specifically targeting the Chinese population remain scarce. This retrospective study aims to identify independent factors influencing epidural depth in PCNL patients and to develop simple, level-specific predictive models for different puncture sites, thereby providing a practical reference for clinical epidural anesthesia.",[69,70],"Epidural Anesthesia","Percutaneous Nephrolithotomy (PCNL)",[72,73,74,75,70],"epidural anesthesia","epidural depth","predictive model","body mass index","NOT_YET_RECRUITING","2026-07-13",{"date":79,"type":80},"2026-07-16","ACTUAL",{"date":82,"type":65},"2026-06-30",{"date":84,"type":65},"2026-08-31",{"name":5,"class":6},1]