ClinicalTrials.gg
CompletedNCT03335761Updated Jan 8, 2021Results posted

InterStim® Amplitude Study

An interventional study of InterStim Therapy in Urinary Urge Incontinence, sponsored by MedtronicNeuro. Completed at 18 sites in 7 countries. Open to female participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2021-01-08.

Sponsored by MedtronicNeuro (part of Medtronic) · Not applicable, Interventional, and Basic science

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Phase
Not applicable
Study type
Interventional
Enrollment
97
Allocation
Randomized
Ages
18 Years and older
Sex
Female
01

Where this study stands

Counted across the records on this site · 2026-11-13

Among 135 studies in Urinary Incontinence, Urge with a site in United States — 19 open to participants now, 27 under way, none of them phase 3. Urinary Incontinence, Urge · United States.

Enrollment
51st of 119
97 · median 75
Started
2018
with 14 others
No phase
72 of 135
10 open now
Registered
60th of 135
by date
Lead sponsor
6 of 135
MedtronicNeuro

Among the 135 studies in Urinary Incontinence, Urge with a site in United States, this one is the 51st largest by enrollment of the 119 interventional ones that give a count, is one of 15 that started in 2018, is one of 72 with no phase, and was the 60th registered.

Urinary Incontinence, Urge

242 studies on the registry are indexed under Urinary Incontinence, Urge; 38 are open to participants now.

Browse Urinary Incontinence, Urge studies →

Open to participants now

19 of the 135 studies in Urinary Incontinence, Urge with a site in United States are open now. Recruiting first, the newest first:

14 more — sign in →

All 19 open studies →

A study can be open while its sites in United States have not opened yet or have stopped. Only those recruiting at a site in United States →

Who these studies take

Of the 25 Urinary Incontinence, Urge studies recruiting now, 18 (72%) set no upper age limit and 2 (8%) stop at 75 or younger; 1 takes children under 18; 2 take healthy volunteers.

This study: 18 Years and older · female · no healthy volunteers.

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Watch this landscapeDownload CSVNarrow it in search →With an account: a weekly mail of what changed among 135 studies in Urinary Incontinence, Urge with a site in United States, or all of them as a file.
02

Study summary

This feasibility study will explore the effects of three different InterStim amplitude settings on overactive bladder symptoms (OAB).

Read the detailed description

This is a prospective, randomized, multicenter, single-blinded study to explore the efficacy and quality of life (QoL) of 3 different amplitude settings.

03

Conditions studied

  • Urinary Urge Incontinence

Keywords

  • Urinary
  • Incontinence
04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
Female
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  1. Primary diagnosis of urinary urge incontinence (UUI) as demonstrated on a 3-day baseline voiding diary demonstrating at least 3 UUI episodes
  2. Female subjects 18 years of age or older
  3. Candidate for InterStim Lead Placement
  4. Willing and able to accurately complete voiding diaries, questionnaires, attend visits, and comply with the study protocol (which includes maintenance of InterStim II programming settings over the course of the study)
  5. Willing and able to provide signed and dated
  6. Willing to maintain current regimen (dosage and frequency) of any overactive bladder (OAB) medication

Exclusion criteria

Exclusion Criteria:

  1. Have neurological conditions such as multiple sclerosis, peripheral neuropathy or spinal cord injury
  2. History of diabetes unless the diabetes is well-controlled through diet and/or medications
  3. Symptomatic urinary tract infection (UTI)
  4. Have primary stress incontinence or mixed incontinence where the stress component overrides the urge component
  5. Treatment of urinary symptoms with botulinum toxin in the past 9 months or any plan to have botulinum toxin treatment during the study
  6. Implanted with a neurostimulator, pacemaker, or defibrillator
  7. Have knowledge of planned MRIs, diathermy, microwave exposure, high output ultrasonic exposure, or radio frequency (RF) energy exposure not included within the scanning conditions provided with the MRI Guidelines for InterStim Therapy
  8. Women who are pregnant or planning to become pregnant
  9. Characteristics indicating a poor understanding of the study or characteristics that indicate the subject may have poor compliance with the study protocol requirements.
  10. Currently enrolled or planning to enroll in a potentially confounding clinical study during the course of the study (co-enrollment in concurrent studies is only allowed when documented pre-approval is obtained from the Medtronic study manager (or designee).
Terms in these criteria, in plain language(2)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

Clinically significant

Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.

05

Study design

Phase
Not applicable
Primary purpose
Basic science
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Single (Participant)
Enrollment
97 participants (actual)

Study arms

  • Experimental
    Amplitude Setting #1

    InterStim Therapy will be set to amplitude parameter #1.

    Device: InterStim Therapy

  • Experimental
    Amplitude Setting #2

    InterStim Therapy will be set to amplitude parameter #2.

    Device: InterStim Therapy

  • Experimental
    Amplitude Setting #3

    InterStim Therapy will be set to amplitude parameter #3.

    Device: InterStim Therapy

Interventions

  • DeviceInterStim Therapy

    Device Programming

06

What researchers measure

Primary outcomes

  1. Change in Urinary Urge Incontinence (UUI) Episodes Per Day From Baseline to 12 Weeks.

    Symptoms related to OAB were evaluated using paper voiding diaries. Subjects were trained to complete the urinary voiding diaries for 3-days.

    Time frame: 12 weeks

Secondary outcomes

  1. Change in QoL Using ICIQ-OAB QOL From Baseline to 12 Weeks.

    International Consultation on Incontinence Modular Questionnaire - Overactive Bladder Symptoms Quality of Life Questionnaire The questionnaire consists of 4 subscales and a single item on urinary symptom interference. The four subscales of Concern (7 items), Coping (8 items), Sleep (5 items), and Social (5 items) are measured on a scale from 0-100 using a range percentile transformation on the summed value from individual listed items. The Health-Related Quality of Life (HRQL) score is a calculated score with a range from 0 to 100 using a range percentile transformation on the summed value from the subscales. Subjects were asked a urinary symptom interference question. "Interference" was measured on a scale from 0-10. A positive change in Concern, Coping, Sleep, Social, and HRQL indicates improvement in Quality of Life; a negative change in Interference indicates improvement in Quality of Life.

    Time frame: 12 weeks

07

Results

Posted Jan 8, 2021

Participant flow

Out of 97 subjects enrolled in the study, 48 were randomized, 46 were implanted with a neurostimulator device, and 43 completed their 12 week follow-up visit before exiting the study. Nineteen were randomized to 50% of sensory threshold, 14 were randomized to 80% of sensory threshold, and 15 were randomized to sensory threshold.

Participant flow — Overall Study
MilestoneAmplitude Setting #1 = 50% Sensory ThresholdAmplitude Setting #2 = 80% Sensory ThresholdAmplitude Setting #3 = Sensory Threshold
Started191415
Implanted with a neurostimulator device181414
Completed171313
Not completed212

Outcome measures

PrimaryChange in Urinary Urge Incontinence (UUI) Episodes Per Day From Baseline to 12 Weeks.

Symptoms related to OAB were evaluated using paper voiding diaries. Subjects were trained to complete the urinary voiding diaries for 3-days.

Time frame:
12 weeks
Reported as:
Mean · UUI episodes/day
Change in Urinary Urge Incontinence (UUI) Episodes Per Day From Baseline to 12 Weeks.
UUI episodes/dayAmplitude Setting #1 = 50% Sensory ThresholdAmplitude Setting #2 = 80% Sensory ThresholdAmplitude Setting #3 = Sensory Threshold
UUI episodes per day at Baseline4.4 ± 2.95.3 ± 3.15.1 ± 4.7
UUI episodes per day at 12 weeks1.4 ± 2.62.4 ± 3.01.5 ± 2.3
Change in UUI episodes per day from baseline to 12 weeks-3 ± 2.6-2.9 ± 2.9-3.6 ± 2.8
SecondaryChange in QoL Using ICIQ-OAB QOL From Baseline to 12 Weeks.

International Consultation on Incontinence Modular Questionnaire - Overactive Bladder Symptoms Quality of Life Questionnaire The questionnaire consists of 4 subscales and a single item on urinary symptom interference. The four subscales of Concern (7 items), Coping (8 items), Sleep (5 items), and Social (5 items) are measured on a scale from 0-100 using a range percentile transformation on the summed value from individual listed items. The Health-Related Quality of Life (HRQL) score is a calculated score with a range from 0 to 100 using a range percentile transformation on the summed value from the subscales. Subjects were asked a urinary symptom interference question. "Interference" was measured on a scale from 0-10. A positive change in Concern, Coping, Sleep, Social, and HRQL indicates improvement in Quality of Life; a negative change in Interference indicates improvement in Quality of Life.

Time frame:
12 weeks
Reported as:
Mean · units on a scale
Change in QoL Using ICIQ-OAB QOL From Baseline to 12 Weeks.
units on a scaleAmplitude Setting #1 = 50% Sensory ThresholdAmplitude Setting #2 = 80% Sensory ThresholdAmplitude Setting #3 = Sensory Threshold
Change in Coping from baseline to 12 weeks44.4 ± 30.441.0 ± 26.339.4 ± 27.9
Change in Concern from baseline to 12 weeks48.2 ± 28.950.3 ± 1749.9 ± 30.2
Change in Sleep from baseline to 12 weeks31.4 ± 26.637.8 ± 22.732.0 ± 31.6
Change in Social from baseline to 12 weeks20.9 ± 25.028.6 ± 1720.6 ± 19.9
Change in HRQL from baseline to 12 weeks38.1 ± 24.440.5 ± 16.737.1 ± 23.4
Change in Interference from baseline to 12 weeks-5.2 ± 3.3-4.7 ± 3.0-4.7 ± 3.5

Adverse events

Collected over From Post-Neurostimulator device implant to 12 weeks follow-up visit. Non-serious events are listed at a 0% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
Amplitude Setting #1 = 50% Sensory Threshold0/19 (0%)3/19 (15.8%)3/19 (15.8%)
Amplitude Setting #2 = 80% Sensory Threshold0/14 (0%)1/14 (7.1%)1/14 (7.1%)
Amplitude Setting #3 = Sensory Threshold0/15 (0%)3/15 (20%)3/15 (20%)
Most frequent serious events
Most frequent serious events
EventAmplitude Setting #1 = 50% Sensory ThresholdAmplitude Setting #2 = 80% Sensory ThresholdAmplitude Setting #3 = Sensory Threshold
Cerebrovascular accidentNervous system disorders0/191/140/15
DyspnoeaRespiratory, thoracic and mediastinal disorders0/190/141/15
MigraineNervous system disorders0/190/141/15
Gastric ulcer haemorrhageGastrointestinal disorders0/190/141/15
Pain in extremityMusculoskeletal and connective tissue disorders0/190/141/15
SepsisInfections and infestations1/190/140/15
Suicide attemptPsychiatric disorders1/190/140/15
Umbilical herniaGastrointestinal disorders1/190/140/15
Most frequent other events
Most frequent other events
EventAmplitude Setting #1 = 50% Sensory ThresholdAmplitude Setting #2 = 80% Sensory ThresholdAmplitude Setting #3 = Sensory Threshold
ParaesthesiaNervous system disorders1/190/142/15
Medical device site painGeneral disorders0/191/140/15
Dermatitis contactSkin and subcutaneous tissue disorders1/190/141/15
PainGeneral disorders0/190/141/15
PruritusSkin and subcutaneous tissue disorders1/190/140/15

Baseline characteristics

This summarizes demographics for subjects in the Randomized Subject Set.

Age, Continuous
Age, Continuous(years)Amplitude Setting #1 = 50% Sensory ThresholdAmplitude Setting #2 = 80% Sensory ThresholdAmplitude Setting #3 = Sensory ThresholdTotal
Mean64.1 ± 1657.9 ± 16.156.7 ± 14.960 ± 15.7
Sex: Female, Male
Sex: Female, Male(Participants)Amplitude Setting #1 = 50% Sensory ThresholdAmplitude Setting #2 = 80% Sensory ThresholdAmplitude Setting #3 = Sensory ThresholdTotal
Female19141548
Male0000
Race and Ethnicity Not Collected
Race and Ethnicity Not Collected(Participants)Amplitude Setting #1 = 50% Sensory ThresholdAmplitude Setting #2 = 80% Sensory ThresholdAmplitude Setting #3 = Sensory ThresholdTotal
Count of participants———0
BMI
BMI(kg/m^2)Amplitude Setting #1 = 50% Sensory ThresholdAmplitude Setting #2 = 80% Sensory ThresholdAmplitude Setting #3 = Sensory ThresholdTotal
Mean30.0 ± 5.736.3 ± 11.233.1 ± 6.432.8 ± 8.1
08

Study locations

18 sites
  • Academic Urology & Urogynecology of Arizona
    Phoenix, Arizona 85027, United States
  • East Coast Institute for Research
    Jacksonville, Florida 32216, United States
  • Pinellas Urology
    Saint Petersburg, Florida 33710, United States
  • Florida Urology Partners
    Tampa, Florida 33606, United States
  • Minnesota Urology Fridley
    Fridley, Minnesota 55432, United States
  • Minnesota Urology Woodbury
    Woodbury, Minnesota 55125, United States
  • Adult Pediatric Urology and Urogynecology
    Omaha, Nebraska 68114, United States
  • Urologic Research & Consulting
    Englewood, New Jersey 07631, United States
  • Carolina Urology Partners
    Concord, North Carolina 28025, United States
  • Chattanooga Hamilton County Hospital Authority d/b/a Erlanger Health System
    Chattanooga, Tennessee 37421, United States
  • Vanderbilt University Medical Center
    Nashville, Tennessee 37232-2765, United States
  • Aurora Research Institute - Aurora West Allis Women's Pavilion
    West Allis, Wisconsin 53227, United States
  • UZ Leuven - Campus Gasthuisberg - Department Urology
    Leuven, 3000, Belgium
  • University Urology Associates, Toronto Western Hospital
    Toronto, Ontario M5T 2S8, Canada
  • CHU Hôpitaux de Rouen - Hôpital Charles Nicolle
    Rouen, France
  • Azienda Ospedaliera Universitaria Integrata Verona
    Verona, 37126, Italy
  • Erasmus MC
    Rotterdam, 3015 GD, Netherlands
  • University College London Hospitals NHS Foundation Trust - University College Hospital
    London, W1G 8PH, United Kingdom
09

References and documents

Study documents

PDFs hosted by the registry, ClinicalTrials.gov.

Individual participant data

Plan to share: No

10

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Ran from Feb 2018 to primary completion in Nov 2019, 20 months.

Results were first posted in Jan 2021, 1 year 2 months after primary completion.

Of 77 interventional studies with no phase under Urinary Incontinence, Urge, half reached primary completion within 20 months of starting (the median), counting those still running; a quarter within 10 and three quarters within 41. This study's 20 months is close to that.

How these figures are worked out, and which studies are left out of them.

Registered
Oct 23, 2017
First posted
Nov 8, 2017
StartActual
Feb 27, 2018
Primary completionActual
Nov 6, 2019
CompletionActual
Nov 6, 2019
Results first posted
Jan 8, 2021
Last update
Jan 8, 2021
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Jan 8, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT03335761
Lead sponsor
MedtronicNeuro
Responsible party
Sponsor
First posted
Nov 8, 2017
Start date
Feb 27, 2018
Primary completion
Nov 6, 2019
Completion
Nov 6, 2019
Results posted
Jan 8, 2021
Last update
Jan 8, 2021

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
Yes
View the source record on ClinicalTrials.gov ↗

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