taVNS for FRNS in Children

This study tests a non-invasive nerve stimulation technique called taVNS (transcutaneous auricular vagus nerve stimulation) — a gentle electrical pulse applied to the ear — to see if it can reduce how often children with a kidney condition called Frequently Relapsing Nephrotic Syndrome (FRNS) have relapses. The goal is to find a drug-free way to help the kidneys stay in remission longer. You may be eligible if: - Your child is between 3 and 17 years old - Your child has been diagnosed with Frequently Relapsing Nephrotic Syndrome (FRNS) - Your child has Minimal Change Disease (MCD) or Focal Segmental Glomerulosclerosis (FSGS) - Your child's kidneys respond to steroid treatment (steroid-sensitive) - Your child is currently in remission (protein levels in urine are very low) - Your child has adequate kidney function (eGFR ≥30 ml/min/1.73 m²) You may NOT be eligible if: - Your child has a secondary cause of nephrotic syndrome (caused by another disease) - Your child's nephrotic syndrome does not respond to steroids - Your child is currently on immunosuppressive medications - Your child has a known inflammatory condition such as lupus - Your child has a history of heart problems or an implantable electronic device - Your child is pregnant Talk to your doctor to see if this trial is right for you.