TEST-ON - Does iStim Reduce Urinary Urgency? (TEST-ON)

  • End date
    Oct 27, 2023
  • participants needed
  • sponsor
    University of California, Los Angeles
Updated on 27 May 2022
electrical stimulation
overactive bladder
urinary urgency
micturition chart
Accepts healthy volunteers


Overactive bladder (OAB) is a chronic disorder with an overall prevalence in the adult population of over 10%, but that may exceed 40% in elderly groups. Most overactive bladder treatments are aimed at decreasing urgency incontinence episodes. The purpose of this study is to determine whether an at-home transvaginal electrical stimulation (TES) program works to alleviate symptoms of urgency in patients with urinary urgency and frequency without incontinence. This is a cross-over trial. Women >18 yo presenting with OAB-dry will be randomized to receive one of two TES at home programs for 4 weeks. After completion of the program, the participant's symptoms will be assessed with standardized patient questionnaires. There will then be a 3 week washout period followed by the second at-home TES program. At the completion of the second program, the participant's symptoms will be assessed with the same standardized questionnaires. The participants will be followed for 6 months following the completion of the TES program.


This will be a prospective randomized cross over trial. We will recruit women who present to clinic to see a Female Pelvic Medicine and Reconstructive Surgery, fellowship-trained provider within the UCLA Health System with the symptoms of OAB-dry and have failed or decline anti-cholinergic therapy.

Screening: Patients will be made aware of the study by their physician. Interested subjects will interact with study staff in person or by telephone for a complete description of the study. If they wish to continue, they will be screened for eligibility by study staff. If eligible, they will be given as much time as they wish to complete the process of informed consent and have their questions answered. Consent will be obtained electronically using the RedCap system.

After informed consent, subjects will be asked to complete intake questionnaires, sent through the RedCap site. These questionnaires include the International Consultation on Incontinence Questionnaire-Female Lower Urinary Tract Symptoms (ICIQ-FLUTS), female GenitoUrinary Pain Index (fGUPI), Pelvic Organ Prolapse Distress Inventory (POPDI-6) portion of the Pelvic Floor Disability Index (PFDI), the first 8 questions of the OverActive Bladder questionnaire (OAB-q), the last question of the AUA symptom score, and the Urgency Perception Scale: UPC.

After informed consent, study staff will access subjects' medical records to obtain the results of standard care procedures that are regularly performed for patients with this symptomatology, specifically, pelvic exam and urodynamics.

Participants will be asked to make a research visit for training and to obtain materials. They will be issued the iStim device. Both groups will be oriented to the vaginal stimulation device which includes the iStim TENS unit and Transvaginal Probe. The iStim TENS unit delivers a bipolar square wave that can be delivered over a range of 0 to 100 mA. On the TENS unit the patient can set frequency, duration of stimulation, pulse duration, and amplitude. During each participant's in-person visit they will be instructed by trained study staff on how to use the electrical stimulation.

Patients will be randomized to treatment A followed by treatment B (Group 1) or treatment B followed by treatment A (Group 2). The patients will be blinded to which treatment they are receiving first.

Each treatment phase will be 4 weeks in duration. The washout period between phases will be three weeks. Patients will be given a log to record each session completed at home in order to determine compliance. They will also be asked to record the amplitude achieved for each session in the treatment phase. Patients will be able to report adverse events electronically through RedCap or by contacting study staff directly.

At the end of each 4-week treatment patients will be asked to complete the same intake questionnaires again with the addition of the select questions from the modified version of the Overactive Bladder Patient Satisfaction with Treatment Questionnaire (OAB-PSTQ) and Patient Global Assessment (PGA) which assesses their perception of the intervention.

At the end of the intervention, participants will be asked to complete a bladder diary again using the same IUGA bladder diary.

Participants will be followed through their medical record for 6 months after completion of study activities. Further OAB therapies tried will be recorded as well as pelvic exams and/or urodynamics done as part of their standard care. They will be asked to complete the set of intake questionnaires once more at the end of 6 months.

Condition Overactive Bladder, Urgency-frequency Syndrome, Urinary Frequency More Than Once at Night
Treatment iStim TENS unit and Transvaginal Probe
Clinical Study IdentifierNCT04957524
SponsorUniversity of California, Los Angeles
Last Modified on27 May 2022


Yes No Not Sure

Inclusion Criteria

Age > 18 years old
English speaking
OAB symptoms for greater than 3 months duration defined as
Urgency: Answer to OAB-q3 > 4]
Frequency: greater than 8 voids on bladder diary during waking hours and OAB-q1 > 3
No urinary urge incontinence: OAB-q8 < 2 and OAB-q4 < 2
No significant pelvic pain: fGUPI4 < 4

Exclusion Criteria

Age less than 18
Vaginal infection or lesion
Neurogenic bladder
Immunocompromised state (hx of transplant, on immunosuppressing drugs)
PVR >150cc
Urinary tract infections
Neurogenic bladder
Reduced perception of vaginal sensation
Metallic implants
Implanted electrical devices (i.e. pace maker)
Clear my responses

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