This is a randomized clinical trial, in which women aged between 18 and 65 years with urinary symptoms of OAB were included. Participants with OAB due to neurological impairment, lower urinary tract infection, sensory deficit in the sacral or tibial region, chronic renal failure, implantable cardioverter defibrillator and pregnant women were excluded.After signing the free and informed consent, the participants were instructed to fill in the voiding diary (VD) for 3 days and answered sociodemographic information and anamnesis. The following week, after delivery of the VD, they answered the International Consultation on Incontinence Questionnaire Overactive Bladder (ICIQ-OAB) and the post-mictional residue (PMR) was evaluated by ultrasound.
Randomization was performed into four groups:
• EETPA-TENS: ambulatory parasacral transcutaneous electrical stimulation with low frequency;
• EETPA-AUSSIE: ambulatory parasacral transcutaneous electrical stimulation with medium frequency;
• EETTA-AUSSIE: ambulatory transcutaneous tibial electrical stimulation with medium frequency;
• EETPD-TENS: home transcutaneous parasacral electrical stimulation with low frequency.
The treatment for the groups (EETPA) using TENS and AUSSIE consisted of 30 sessions performed three times a week with intensity according to the participant's tolerance, at the sensitive threshold, without muscle contraction, with the positioning of the self-adhesive electrodes either in the parasacral or in the region of the tibial nerve, according to the group. In the TENS current protocol, the Neurodyn Portable TENS device (IBRAMED, Amparo, São Paulo, Brazil) was used, the wave frequency used was 10 Hz, the pulse width of 500 µs and for 20 minutes. In the AUSSIE current protocol, the device Neurodyn 10 Channels (IBRAMED, Amparo, São Paulo, Brazil) was used, the frequency was 4 KHz, pulse width of 4 ms, burst frequency of 100 Hz, in continuous mode and for 30 minutes. For the EETPD-TENS group, 70 sessions were performed daily, guided and monitored weekly by a trained researcher, with the same protocol as for the EETPA-TENS group.
To assess the clinical response, the Visual Analog Scale (VAS) and the Likert Scale (very dissatisfied, dissatisfied, unchanged, satisfied, very satisfied) were applied, as well as the ICIQ-OAB and the PMR.
The paired t test was used to compare intragroup numerical variables, and the chi-square test was used to compare categorical variables between groups. The significance level adopted was 5%.