[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100619421":3},{"organization":4,"armGroups":7,"interventions":20,"overallOfficials":25,"centralContacts":29,"locations":35,"responsibleParty":50,"collaborators":25,"id":54,"slug":55,"hasResults":56,"nctId":57,"briefTitle":58,"officialTitle":59,"acronym":25,"eligibilityCriteria":60,"healthyVolunteers":56,"sex":61,"minAge":25,"maxAge":25,"enrollmentInfo":62,"targetDuration":25,"studyType":65,"phases":66,"briefSummary":68,"conditions":69,"keywords":25,"overallStatus":38,"whyStopped":25,"lastUpdateSubmitDate":71,"lastUpdatePostDateStruct":72,"startDateStruct":75,"completionDateStruct":77,"leadSponsor":79,"locationsCount":80},{"fullName":5,"class":6},"Xijing Hospital of Digestive Diseases","OTHER",[8,14],{"label":9,"type":10,"description":11,"interventionNames":12},"taVNS","EXPERIMENTAL","Participants will receive active transcutaneous auricular vagus nerve stimulation (taVNS) delivered to the left cymba conchae using the study device. Stimulation will be administered twice daily for 20 consecutive days, with two 30-minute sessions per day separated by approximately 12 hours. Stimulation parameters will be 30 Hz with a 200 μs pulse width (single pulse width 200 μs).",[13],"Device: transcutaneous auricular vagus nerve stimulation",{"label":15,"type":16,"description":17,"interventionNames":18},"Sham-tACS","SHAM_COMPARATOR","Participants will receive a sham taVNS procedure designed to mimic active stimulation while not providing effective vagal nerve stimulation. Sham sessions will follow the same schedule and duration as the active arm: twice daily for 20 consecutive days, with two 30-minute sessions per day separated by approximately 12 hours. The sham condition will use an identical-appearing device and procedures to maintain blinding.",[19],"Device: Placebo",[21,26],{"type":22,"name":23,"description":11,"armGroupLabels":24,"otherNames":25},"DEVICE","transcutaneous auricular vagus nerve stimulation",[9],null,{"type":22,"name":27,"description":17,"armGroupLabels":28,"otherNames":25},"Placebo",[15],[30],{"name":31,"role":32,"phone":33,"phoneExt":25,"email":34},"Zhifeng Zhao, Ph.D","CONTACT","+8613519171072","zhaozhifeng@outlook.com",[36],{"facility":37,"status":38,"city":39,"state":25,"zip":25,"country":40,"countryCode":41,"cosmosGeoPoint":42,"geoPoint":47,"contacts":48},"Xijing Hospital","RECRUITING","Xi'an","China","CN",{"type":43,"coordinates":44},"Point",[45,46],108.92861,34.25833,{"lat":46,"lon":45},[49],{"name":31,"role":32,"phone":33,"phoneExt":25,"email":34},{"type":51,"investigatorFullName":52,"investigatorTitle":53,"investigatorAffiliation":5,"oldNameTitle":25,"oldOrganization":25},"PRINCIPAL_INVESTIGATOR","Zhifeng Zhao, PhD","Principal Investigator","100619421","optimization-of-tavns-intervention-strategies-for-refractory-constipation-100619421",false,"NCT07344402","Optimization of taVNS Intervention Strategies for Refractory Constipation","A Prospective, Randomized, Controlled Trial Investigating Transcutaneous Auricular Vagus Nerve Stimulation (taVNS) Intervention Strategies and Neurophysiological Mechanisms in Patients With Refractory Constipation","Inclusion Criteria (Revised) Diagnosis of Functional Constipation (FC): Meets Rome IV criteria for functional constipation.\n\nLow CSBM frequency during screening: During the 2-week screening\u002Frun-in period, has ≤2 complete spontaneous bowel movements (CSBMs) per week, based on daily diary.\n\nInadequate response to prior therapy: History of ≥3 months of prior constipation treatment (e.g., laxatives and\u002For prokinetic agents) with inadequate response (persistent constipation symptoms and\u002For persistently low CSBM frequency) as documented by medical history and\u002For records.\n\nAge: 18 to 80 years. Ability to comply: Able and willing to comply with study procedures (including stimulation sessions and diary completion).\n\nNo concurrent clinical trial participation: Not participating in another interventional clinical trial during the study period.\n\nInformed consent: Provides written informed consent. Exclusion Criteria (Revised) Organic\u002Fsecondary causes of constipation: Evidence or history of gastrointestinal organic disease (e.g., inflammatory bowel disease, colorectal tumor, congenital megacolon) or other conditions likely to cause secondary constipation, including endocrine\u002Fmetabolic disorders (e.g., uncontrolled hypothyroidism, uncontrolled diabetes) or neurological disorders (e.g., Parkinson's disease, spinal cord disorders).\n\nMedications causing constipation (unless stable): Current use of medications known to cause constipation (e.g., opioids, anticholinergics) that cannot be discontinued or kept stable during the study, in the investigator's judgment.\n\nOpioid use disorder or chronic opioid use: History of substance abuse or chronic opioid use that may affect bowel function.\n\nSevere psychiatric conditions or safety risk: Current severe psychiatric disorder requiring urgent intervention, or risk of self-harm\u002Fsuicide as assessed by a qualified clinician.\n\nContraindications to taVNS or ear stimulation: Significant ear disease or skin lesions\u002Finfection at the stimulation site, or other contraindications to the study device\u002Fprocedure.\n\nImplanted electronic medical devices: Presence of implanted electrical devices (e.g., pacemaker, implantable cardioverter-defibrillator) or other conditions where electrical stimulation is contraindicated.\n\nPregnancy or lactation: Pregnant or breastfeeding women. Serious comorbidities that may interfere: Severe or unstable medical conditions that could interfere with participation or outcome assessment (e.g., significant cardiovascular disease\u002Farrhythmia, coagulation disorders or regular anticoagulant therapy, severe hepatic\u002Frenal impairment, organ failure).\n\nCognitive\u002Fcommunication impairment: Cognitive impairment, aphasia, or other conditions preventing valid consent or reliable diary completion.\n\nInvestigator discretion: Any condition that, in the investigator's opinion, makes the participant unsuitable for the study.","ALL",{"count":63,"type":64},100,"ESTIMATED","INTERVENTIONAL",[67],"NA","The goal of this clinical trial is to learn whether transcutaneous auricular vagus nerve stimulation (taVNS) works to treat refractory constipation in adults. It will also learn about the safety and tolerability of taVNS. The main questions it aims to answer are:\n\nDoes taVNS improve constipation symptoms, as measured by the change in complete spontaneous bowel movements per week (ΔCSBMs\u002Fweek) from baseline to post-treatment? What medical problems or side effects do participants have when receiving taVNS? Does taVNS reduce the need for rescue laxatives? Researchers will compare active taVNS to sham taVNS to see if taVNS works to treat refractory constipation.\n\nParticipants will:\n\nBe randomly assigned (double-blind) to receive active taVNS or sham taVNS for 20 days Receive stimulation twice daily, 30 minutes per session, with a 12-hour interval between sessions Receive stimulation at 30 Hz with 200 μs pulse width, delivered to the left cymba conchae Keep a daily diary of bowel habits and symptoms, including CSBMs, and rescue laxative use (bowel movements occurring within 24 hours after rescue laxative use will not be counted as CSBMs)",[70],"Refractory Constipation","2026-01-07",{"date":73,"type":74},"2026-01-15","ACTUAL",{"date":76,"type":74},"2025-09-01",{"date":78,"type":64},"2026-01-20",{"name":5,"class":6},1]