Prospective, randomized, placebo controlled trial to evaluate the efficacy of transcutaneous stimulation of n. tibialis posterior in treatment of idiopathic overactive bladder

INTERVENTION: Intervention 1: Stimulation of the tibial posterior nerve 5 x 15 min a week with the device contic+ and 20 Hz Intervention 2: Stimulation of the fibular superficial nerve 5 x 15 min a week with the device contic+ and 20 Hz. After unblinding on week 6, verum stimulation at tibial posterior nerve will be performed in same setting CONDITION: N31.82 ‐ [generalization N31.8: Other neuromuscular dysfunction of bladder] N39.42 ‐ [generalization N39.4: Other specified urinary incontinence] PRIMARY OUTCOME: Change in Patient Global Impression of Improvement (PGI‐I) SECONDARY OUTCOME: Kings Health Questionnaire; OAB‐SS; Quality of life (QoL); ICIQ‐SF; Reduction of the average frequency of micturition / day; Reduction of average urine loss / day:; ‐ padweight 24h; ‐ Incontinence episodes 24h INCLUSION CRITERIA: Idiopathic overactive bladder Age 18 to 70 years Ability to give consent Oral drug treatment of OAB should be discontinued 4 weeks before the start of treatment or continued for the duration of the study