Transvaginal Botulinum Toxin A Chemodenervation for Overactive Bladder

Early Phase 1

Completed

• Conditions: Urgency Urinary; Urinary Frequency/Urgency; Urge Incontinence; Overactive Bladder; Bladder, Overactive
• Interventions: Drug: Transvaginal botulinum toxin A (BTA) injection

• Registration Number: NCT05463822
• Lead Sponsor: Stanford University

Brief Summary

Overactive bladder (OAB) is a highly prevalent disease process that, when refractory to oral medication therapy, can be effectively managed with injection of botulinum toxin A (BTA) into the detrusor muscle of the bladder. However, the traditional procedure requires a cystoscope inserted into the bladder which can be painful and is associated with a risk of urinary tract infection. The purpose of this study is to determine if transvaginal injection of BTA into the detrusor muscle of the bladder wall is feasible to perform, and efficacious for the treatment of refractory overactive bladder.

Detailed Description

PURPOSE OF RESEARCH: Women with overactive bladder are invited to participate in a research study of transvaginal injection of botulinum toxin A (BTA) into the bladder wall for overactive bladder. We hope to learn that this route is easy to perform, well tolerated, and is effective in controlling overactive bladder symptoms. Possible participants in this study are selected because they have overactive bladder symptoms that were refractory to oral therapy, and we believe BTA injection therapy may improve symptoms. This drug is FDA approved for treatment of this disorder via the cystoscopic route of delivery when injected into the wall of the bladder for overactive bladder. In our study we will be injecting BTA into the wall of the bladder by simply inserting a small needle through the anterior vaginal wall to deliver BTA to the bladder wall.

DURATION OF STUDY INVOLVEMENT: This research study is expected to take 120 minutes for the baseline visit at week 0 for transvaginal BTA injection, and then 30 minutes for each of the follow-up visits via telehealth or in-person at 6 and 12 weeks following the procedure. Just as in routine clinical practice for cystoscopic BTA injection, subjects will be eligible for repeat BTA injection when they report less than 50% improvement in symptoms after the 12 week study visit. This will help us understand how long the effect of the BTA lasts, which is typically 3 to 12 months with the traditional cystoscopic route of delivery. A new consent form will be signed at the time of each repeat injection.

INJECTION PROCEDURE AND FOLLOW-UP:

* At the week 0 baseline visit, subjects will urinate into a cup for urinalysis to make sure they do not have a urinary tract infection. Subjects will then undergo post-void residual measurement of how much urine is left in the bladder after they urinate using an non-invasive ultrasound bladder scanner, as is routinely done in office, to make sure they are not retaining urine prior to BTA injection.

* If there is no urinary tract infection and subjects are not in urinary retention, then a routine vaginal exam will be performed to confirm the anatomy of the anterior vaginal wall. The investigator will then use a vaginal ultrasound to measure the dimensions of the bladder and the thickness of the trigone of the bladder prior to injection. The ultrasound is then removed. The ultrasound procedure usually takes less than 15 minutes.

* The investigator will then reconstitute the BTA (Botox® 100 units) with preservative free saline for injection, and then using a very thin 25 gauge needle the BTA will be injected into the bladder in a single needle puncture. The injection procedure unusually takes less than 1 minute and patients usually report just a brief cramp during the injection that resolves within 2 minutes following injection.

* The investigator will then perform a repeat vaginal ultrasound to measure the change in the thickness of the trigone of the bladder after injection. The injection site will be observed for hemostasis and subjects will be given a Kotex pad to keep the betadine from staining the underwear. Subjects may see some spotting on the pad for up to 24 hours after injection. Post-injection precautions and teaching will be provided by the investigator after the procedure.

* After the injection, the investigator will schedule subjects for follow-up visits for 6 and 12 weeks after injection. Follow-up visits will be conducted via telehealth or in-person if subjects are not able to complete a telehealth visit. Subjects will be expected to complete the bladder questionnaires and 3-day bladder diary at baseline and before each of these visits so that the investigator can accurately measure the change in overactive bladder symptoms after BTA injection.

* Just as in routine clinical practice for cystoscopic BTA injection, subjects will be eligible for repeat BTA injection when they report less than 50% improvement in symptoms according to the patient global impression of change (PGIC) scale after the 12 week study visit. This will help us understand how long the effect of the BTA lasts, which is typically 3 to 12 months with the traditional cystoscopic route of delivery. A new consent form will be signed at the time of repeat injection.

Basic Information
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Recruitment & Eligibility
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Study & Design
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Trial Locations

Study Timeline

• Study First Submitted: 2018-08-23
• Study Start: 2019-06-20
• Primary Completion: 2021-09-27
• Study Completion: 2021-09-27
• Status Verified: 2022-07
• Study First Submitted QC: 2022-07-14
• Last Update Submitted: 2022-07-14
• Study First Posted: 2022-07-19
• Last Update Posted: 2022-07-19

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Female
• Target Recruitment: 15

Inclusion Criteria

• Females with overactive bladder
• Females who are considering intradetrusor botulinum toxin A chemodenervation for the treatment of refractory overactive bladder

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Exclusion Criteria

• Overactive bladder caused by neurological condition (i.e. spinal cord injury, multiple sclerosis, amyotrophic lateral sclerosis, Parkinson's disease, etc.)
• Predominance of stress urinary incontinence as reported by the patient
• Involvement in other studies with potentially overlapping indications or symptoms
• Patients who are unable to undergo a transvaginal ultrasound intervention as a result of anatomic barriers or discomfort will be excluded from enrollment
• Patients known to be pregnant or breastfeeding
• Known allergy to botulinum toxin A injection therapy

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Transvaginal botulinum toxin A (BTA) injection	Transvaginal botulinum toxin A (BTA) injection	Botulinum toxin A (Botox® 100 units) will be injected into the detrusor muscle of the bladder by inserting a needle through the anterior vaginal wall.

Primary Outcome Measures

Name	Time	Method
Response to the Treatment Benefit Scale (TBS) Questionnaire	at 6 weeks and 12 weeks following baseline injection visit (week 0)	Assessing improvement in urinary symptoms following intervention. The Treatment Benefit Scale Questionnaire asks patients to state if their condition (overactive bladder) has 1) greatly improved, 2) improved, 3) not changed, or 4) worsened during treatment. Patients who select 1 or 2 are considered to have derived a perceived benefit from the treatment, and will represent those patients who had a positive TBS response.

Secondary Outcome Measures

Name	Time	Method
Change in Voiding Diary Symptoms - number of mean daily micturition episodes	baseline injection visit (week 0) and then at 6 weeks and 12 weeks following intervention	Assessing the mean change in number of micturition episodes recorded in a three day Voiding Diary. A higher number implies worse urinary symptoms. Efficacy of treatment is associated with a 50% reduction in micturition episodes daily
Change in Voiding Diary Symptoms - number of mean daily urgency episodes	baseline injection visit (week 0) and then at 6 weeks and 12 weeks following intervention	Assessing the mean change in number of urgency episodes recorded in a three day Voiding Diary. A higher number implies worse urinary symptoms. Efficacy of treatment is associated with a 50% reduction in urgency episodes daily
Change in International Consultation on Incontinence Questionnaire - short form	baseline injection visit (week 0) and then at 6 weeks and 12 weeks following intervention	Assessing changes in International Consultation on Incontinence Questionnaire - short form (ICIQ-SF, a validated questionnaire evaluating lower urinary tract symptoms) following intervention. This questionnaire asks 3 questions on urinary symptoms: 1) How often do you leak? to which patients respond 0-never, 1-about once a week or less often, 2-two or three times a week, 3-about once a day, 4-several times a day, 5-all the time. 2) how much urine do you usually leak? to which patients respond 0-none, 2-a small amount, 4-a moderate amount, 6-a large amount. 3) Overall, how much does leaking urine interfere with your everyday life? patients select a score from 0-10, where 0 is not at all, and 10 is a great deal. The sum of these questions composes the overall ICIQ score. A higher score implies worse urinary symptoms. A reduction of the overall score by 50% will be considered a treatment benefit.
Change in Overactive Bladder questionnaire, Short Form	baseline injection visit (week 0) and then at 6 weeks and 12 weeks following intervention	Assessing changes in Overactive Bladder questionnaire, Short Form (OABq-SF, a validated questionnaire evaluating lower urinary tract symptoms) following intervention. This questionnaire is composed of 6 questions asking patients, "during the past 4 weeks, how bothered were you by..." 1. an uncomfortable urge to urinate? 2. A sudden urge to urinate with little or no warning? 3. Accidental loss of small amounts of urine? 4. nighttime urination? 5. Waking up at night because you had to urinate? 6. Urine loss associated with a strong desire to urinate? For each question, patients select 1) not at all, 2) a little bit, 3) somewhat, 4) quite a bit, 5) a great deal, 6) a very great deal. Total scores range from a score of 6 - 36. A higher score implies worse urinary symptoms. A reduction of the overall score by 50% will be considered a treatment benefit.

Trial Locations

Locations (1)

Urology Clinic (Stanford University), 1000 Welch Road, Suite 100; 🇺🇸 Stanford, California, United States