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Overactive BladderTEST-ONNCT04957524

TEST-ON - Does iStim Reduce Urinary Urgency?

A study testing iStim TENS unit and Transvaginal Probe in people with Overactive Bladder and Urgency-frequency Syndrome, run by University of California, Los Angeles at 1 site in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

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. Read more about this study

Who is it for?
Ages 18 to 120 years, women onlyHealthy volunteers can take part
What is being tested?
iStim TENS unit and Transvaginal Probe
Type of treatment
Medical device
Could I receive a placebo?
No, everyone receives an active treatment
How many people
24 participants
Where
1 siteUnited States
Study dates
20 Dec 2021to 11 Feb 2025
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 120 years
  • Women only
  • Healthy volunteers accepted
  • Adult, Older adult

Who may be able to join

  • Female
  • 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

Who cannot join

  • Age less than 18
  • Pregnancy
  • Vaginal infection or lesion
  • Neurogenic bladder
  • Immunocompromised state (hx of transplant, on immunosuppressing drugs)
  • PVR >150cc
Show all 11Show fewer
  • Urinary tract infections
  • Neurogenic bladder
  • Reduced perception of vaginal sensation
  • Metallic implants
  • Implanted electrical devices (i.e. pace maker)

Trial locations and contacts

1 site in 1 country.

United States1 site
  • UCLA Center for Women's Pelvic Health

    Los Angeles, California, 90095

Other trials in United States

About this study

Official title: Transvaginal Electrical Stimulation for the Treatment of OAB-dry

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.

Read the detailed description

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.

Being tested
iStim TENS unit and Transvaginal Probe
Medical subject headings
Urinary Bladder, Overactive, Nocturia

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • iStim TENS unit and Transvaginal ProbeDevice

    iStim TENS unit and Transvaginal Probe are both commercially available products. TENS units work by delivering small electrical impulses through electrodes either attached to the skin or through a transvaginal probe.

    iStim transvaginal probe will be inserted vaginally to provide transvaginal electrical stimulation.

Study groups in NCT04957524
Study groupRoleWhat they receive
Set AmplitudeActive comparatorThis arm is to test a specific amplitude. Participants will be instructed to set the amplitude to 20 mA, frequency to 20 Hz, and pulse duration to 5 mS. The parameters will stay the same for the entire session. This stimulation will last 15 minutes and patients will be instructed to perform the at-home therapy once per day.
Receives: Device: iStim TENS unit and Transvaginal Probe
Customizable AmplitudeExperimentalIn this arm, the participant will set the frequency to 12 Hz and pulse duration to 1 millisecond. The participant will be instructed to increase the amplitude gradually and set it at the maximal tolerable amplitude. This stimulation will last 15 minutes and patients will be instructed to perform the at-home therapy once per day.
Receives: Device: iStim TENS unit and Transvaginal Probe

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Urinary urgency

    The primary outcome is the change in participant's reported urgency as measured by the composite score of the first 8 questions of the OAB-q questionnaire. The questionnaire is out of 8 with higher scores corresponding with more bother from urinary urgency. The primary outcome is the difference between the pre-treament and post-treatment scores. The range is 0 to 48 with a larger difference corresponding to more improvement in patient's urgency over the study period.

    Measured: This will be the difference in score from the date of enrollment to the end of both treatment arms. This will range from 11 weeks to 20 weeks.

Secondary outcomes (3)
  1. Percentage of assigned treatment sessions that were successfully completed

    Number of home programs completed compared to planned treatments based on paper treatment log completed by patient. Range is 0 to 100% completion.

    Measured: 4 weeks

  2. Change in Urinary Urgency Episodes

    Change in number of urgency episodes (per 24 hours) as measured on the voiding diaries. This will be the difference in number of urgency episodes pretreatment compared to posttreatment. The range is 0 to 10 urgency episodes.

    Measured: This will be the difference in score from the date of enrollment to the end of both treatment arms. This will range from 11 weeks to 20 weeks.

  3. Change in number of micturitions per 24 hours

    Change in number of micturition episodes (per 24 hours) as measured on the voiding diaries. This will be the difference in number of micturition episodes pretreatment compared to post-treatment. The range is 0 to 20 micturition episodes.

    Measured: This will be the difference in score from the date of enrollment to the end of both treatment arms. This will range from 11 weeks to 20 weeks.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted12 Jul 2021
  2. Study start20 Dec 2021
  3. Primary completion15 May 2023
  4. Study completion11 Feb 2025

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Crossover
Model description
Patient will then be randomized to treatment A followed by treamtent B (Group 1) or treatment B followed by treatment A (Group 2).
Masking
Triple blind
Who is masked
Participant, Care provider, Outcomes assessor
Enrolment
24 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04957524
Sponsor's protocol ID
21-005834
Acronym
TEST-ON
Status last verified
May 2025
First submitted
23 Jun 2021
Last updated
6 May 2025
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No: Individual participant data will not be shared.

Publications

  • Soomro NA, Khadra MH, Robson W, Neal DE. A crossover randomized trial of transcutaneous electrical nerve stimulation and oxybutynin in patients with detrusor instability. J Urol. 2001 Jul;166(1):146-9.

    PubMed 11435843
  • Primus G, Kramer G. Maximal external electrical stimulation for treatment of neurogenic or non-neurogenic urgency and/or urge incontinence. Neurourol Urodyn. 1996;15(3):187-94. doi: 10.1002/(SICI)1520-6777(1996)15:33.0.CO;2-B.

    PubMed 8732985
  • Messelink EJ. The overactive bladder and the role of the pelvic floor muscles. BJU Int. 1999 Mar;83 Suppl 2:31-5. doi: 10.1046/j.1464-410x.83.s2.7.x. No abstract available.

    PubMed 10210602
  • Hoffman D. Understanding multisymptom presentations in chronic pelvic pain: the inter-relationships between the viscera and myofascial pelvic floor dysfunction. Curr Pain Headache Rep. 2011 Oct;15(5):343-6. doi: 10.1007/s11916-011-0215-1.

    PubMed 21739128
  • Guralnick ML, Kelly H, Engelke H, Koduri S, O'Connor RC. InTone: a novel pelvic floor rehabilitation device for urinary incontinence. Int Urogynecol J. 2015 Jan;26(1):99-106. doi: 10.1007/s00192-014-2476-9. Epub 2014 Jul 30.

    PubMed 25074260
  • Brubaker L, Benson JT, Bent A, Clark A, Shott S. Transvaginal electrical stimulation for female urinary incontinence. Am J Obstet Gynecol. 1997 Sep;177(3):536-40. doi: 10.1016/s0002-9378(97)70142-x.

    PubMed 9322620
  • Amaro JL, Gameiro MO, Kawano PR, Padovani CR. Intravaginal electrical stimulation: a randomized, double-blind study on the treatment of mixed urinary incontinence. Acta Obstet Gynecol Scand. 2006;85(5):619-22. doi: 10.1080/00016340500495058.

    PubMed 16752244
  • Yamanishi T, Yasuda K, Sakakibara R, Hattori T, Suda S. Randomized, double-blind study of electrical stimulation for urinary incontinence due to detrusor overactivity. Urology. 2000 Mar;55(3):353-7. doi: 10.1016/s0090-4295(99)00476-8.

    PubMed 10699609
  • Torosis M, Stothers L, Cisneros C, Dominique G, Lenore Ackerman A. Transvaginal Electrical Stimulation for Treatment of Overactive Bladder Without Incontinence: A Pilot Cross-Over Clinical Trial. Neurourol Urodyn. 2025 Jun;44(5):977-986. doi: 10.1002/nau.70034. Epub 2025 Mar 26.

    PubMed 40135809

Questions about this trial

What is this clinical trial studying?

A study testing iStim TENS unit and Transvaginal Probe in people with Overactive Bladder and Urgency-frequency Syndrome, run by University of California, Los Angeles at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 8 inclusion and 11 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 6 May 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Urinary urgency (time frame: This will be the difference in score from the date of enrollment to the end of both treatment arms. This will range from 11 weeks to 20 weeks.). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT04957524, which also lists 9 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 6 May 2025.

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