Clinical trial NCT05583942: A Pilot Trial of taVNS for SRNS in Children (kidNEY-VNS)
Official title: A Pilot Randomized Clinical Trial of Transcutaneous Auricular Vagus Nerve Stimulation for the Treatment of Steroid Resistant Nephrotic Syndrome in Children
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: NA
Conditions: Nephrotic Syndrome in Children
Minimal Change Disease
Focal Segmental Glomerulosclerosis
Keywords: vagus nerve stimulation
pediatric
nephrology
Lead sponsor: Northwell Health
Sponsor class: OTHER
Collaborators: name: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
First posted: 2022-10-18
Enrollment: 10
Sex: ALL
Minimum age (years): 3
Maximum age (years): 17
Standard ages: CHILD
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: Randomized double blind sham controlled clinical trial
Primary purpose: TREATMENT

Brief summary: Children with steroid resistant nephrotic syndrome (SRNS) are exposed to prolonged courses of immunosuppressant medications. Given the adverse side effect profiles and variable efficacy of these medications, there is an urgent need to identify novel and safe therapies to treat nephrotic syndrome in children. Stimulation of the vagus nerve, which can be activated noninvasively by transcutaneous auricular vagus nerve stimulation (taVNS), has immunomodulatory effects mediated by the inflammatory reflex and spleen. taVNS has become a therapy of interest for treating chronic immune mediated illnesses. The aims of the study are (1) To determine the feasibility of protocol implementation and tolerability of taVNS in the treatment of nephrotic syndrome in children (2) To establish proof-of-concept and generate statistical estimates of variance parameters and effect sizes for treatment response outcomes in children with nephrotic syndrome randomized to taVNS therapy compared with sham therapy (3) To investigate the effects of taVNS on inflammatory markers in children with nephrotic syndrome.

Detailed description: A parallel, double blinded, randomized placebo controlled trial comparing daily taVNS use with sham therapy will be conducted in children 3 to 17 years of age with SRNS. Ten participants with SRNS, defined as lack of response to steroids after 4 weeks, will be randomized 1 to 1 to taVNS or sham therapy. Participants will be enrolled at two pediatric tertiary hospitals over a two year time period, with completion of the study by year three. All participants will perform daily taVNS therapy (active for taVNS arm or inactive for sham arm) for 5 minutes each day for a total of 26 weeks.

Participants will monitor heart rate with each treatment and log home urine results. Participants will be monitored monthly with in person study visits at Weeks 8, 16 and 26 alternating with virtual telehealth visits at Weeks 4, 12 and 20. Biosample specimens will be collected at baseline, 8 weeks, 16 weeks and 26 weeks. There will be a follow up period of an additional 26 weeks. All participants will be given the option to receive the active taVNS treatment at the end of the randomized period.

Study Phases The study will consist of three parts. Part 1 - Screening Period- up to 8 weeks. Informed consent/assent will be obtained at screening prior to the conduct of any study-related procedures. Participants will be screened to confirm inclusion/exclusion criteria are met. Participants must be off steroid treatment for 14 days prior to Day 1 and the participant must be in remission (negative UPC on first morning urine) on Day 1.

Part 2 - Randomized Control Period - 26 weeks: Thirty participants with FRNS who meet all of the eligibility criteria will be randomized 1:1 to either taVNS or sham treatment. A trainer will instruct the parent/guardian on use of the device at the randomization visit. Participants will use the intervention device as directed for 5 minutes per day for 26 weeks. Participants will be monitored monthly with in-person study visits at Weeks 8, 16 and 26 alternating with virtual remote video visits at Weeks 4, 12 and 20. The visit window will be +/- 7 days. At each in person visit, we will conduct:

* Vital signs and physical examination
* Assessment for nephrotic syndrome relapses. Home urine protein logs will be reviewed.
* Blood and urine samples will be collected at each in person visit.
* Assessment of study intervention adherence. Parents/guardians will meet with the trainer and will be reoriented on taVNS device use at each visit as a safety measure. The device counter number will be recorded as a measure of adherence.
* Monitor for adverse events and tolerability: Parents/guardians will share a study log with investigators, which describes daily taVNS use, side effects, and any changes in heart rate.

At each virtual remote video visit, we will observe the participant while doing the intervention procedure, assess for nephrotic syndrome relapses, and monitor for any adverse events.

Part 3 - Follow Up Period - 26 weeks: At the completion of the randomized period, participants will be followed for an additional 26 weeks to assess clinical status. For those who stop the intervention, study visits will occur in-person during regularly scheduled clinical visits or via telehealth visit every 8 weeks, whichever is sooner. Participants will be assessed for the number of nephrotic syndrome relapses and home urine protein logs will be reviewed. First morning UPC will be recorded. All participants will be given the option to receive the active taVNS treatment at the end of the randomized period. Unblinding of treatment assignment from the randomized phase will not occur prior to consent for open-label use. As open-label extension trials may introduce significant bias, data obtained from these participants will not be considered part of this research and no statistical analysis will be carried out. However, clinical status and safety will continue to be monitored. In person study visits will occur every 8 weeks for those continuing use of taVNS.

Eligibility criteria: Inclusion Criteria:

* Steroid Resistant Nephrotic Syndrome- defined as lack of remission after 4 weeks of therapy of prednisolone/prednisone at standard dose1
* Age 3-17 years
* eGFR ≥30 ml/min/1.73 m2 (by modified Schwartz formula)
* MCD or FSGS diagnosis (per biopsy)
* Urine protein:creatinine (UPC) greater than 1.0
* Stable immunosuppression and ACE inhibitor/angiotensin receptor blocker treatment regimen for at least three months
* Evidence of B cell repletion for those exposed to rituximab
* Informed consent from the parent or guardian and assent from a minor of ≥ 7 years
* Ability to comply with the study protocol, in the investigator's judgment

Exclusion Criteria:

* Secondary causes of nephrotic syndrome (e.g. genetic, congenital, infectious)
* Steroid sensitive nephrotic syndrome
* History of genetic defects known to directly cause nephrotic syndrome (i.e., NPHS2 \[podocin\], NPHS1 \[nephrin\], PLCE1, WT1, or other known genetic cause)
* Any known inflammatory condition
* History of cardiac disease (arrhythmias, structural/functional abnormalities)
* Implantable electronic devices (pacemakers, defibrillators, hearing aids, cochlear implants or deep brain stimulators)
* Chronic rash or skin breakdown of the left ear at the cymba concha
* Pregnancy

Primary outcomes:
measure: Success of Pilot Trial
timeFrame: Baseline to 26 weeks
Secondary outcomes:
measure: Effect size for change in Change in quality of life (PedsQL)
timeFrame: Baseline to 26 weeks
measure: Effect size for change in urine protein:creatinine
timeFrame: Baseline to 26 weeks
measure: Effect size for change in lipid profile
timeFrame: Baseline to 26 weeks
measure: Effect size for change in proportion with at least a 30 percent reduction in UPC
timeFrame: Baseline to 26 weeks
measure: Recruitment rate
timeFrame: Baseline to 26 weeks
measure: Rate of completion of study
timeFrame: Baseline to 26 weeks
measure: Successful double-blinding
timeFrame: Baseline to 26 weeks
measure: Treatment adherence from home logs
timeFrame: Baseline to 26 weeks
measure: Adverse events
timeFrame: Baseline to 26 weeks
measure: Incidence of withdrawal due to adverse events
timeFrame: Baseline to 26 weeks
measure: Proof of Concept Decision Criteria
timeFrame: Baseline to 26 weeks
measure: Cytokines
timeFrame: Baseline to 26 weeks
measure: Anti-nephrin antibodies
timeFrame: Baseline to 26 weeks
measure: Whole blood monocyte stimulation test
timeFrame: 0 hours, 2 hours
Other outcomes:
Locations:
city: New Hyde Park
country: United States
facility: Cohen Children's Medical Center
state: New York
city: Philadelphia
country: United States
facility: Children's Hospital of Philadelphia
state: Pennsylvania
Study officials:
References: