Standardization of Lead Placement for Sacral Neuromodulation. Part 1

Study Overview
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Brief Summary
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Retrospective case-control study. A substantial number of patients do not respond favourably to sacral neurostimulation (SNS) although clinically, they appear to have the same lower urinary tract dysfunction characteristics as the ones with good responses. This may be due to methodological issues (lead position) or patient selection. The purpose of this study is to improve and standardize lead position, in order to increase the patient response to test stimulation and to SNS treatment, and to decrease adverse events.

Official Title
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Pelvic Floor EMG Monitoring as Tool to Improve Patient Selection and Outcome - Standardization of Lead Placement for Sacral Neuromodulation.

Conditions
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Overactive Bladder, Non Obstructive Urinary Retention

Intervention / Treatment
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* Diagnostic Test: Pelvic floor EMG


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Male or female aged ≥18 years and competent to provide consent Minimum 3 months of self-reported OAB symptoms or self-reported obstructive LUTS in addition to confirmed non-obstructive urinary retention on UDO Failed, or are not a candidate for more conservative treatment (i.e., pelvic floor training, biofeedback, behavioral modification, oral pharmacotherapy) Willing to discontinue OAB medications for 2 weeks prior to the implant and for the entire study period Able to thoroughly fill in all questionnaires, voiding diaries and office visits for device programming and clinical evaluations before the TLP, 3 weeks after TLP and 6 weeks, 6 months and 1 year after implantation of definitive IPG. Exclusion Criteria: Current of prior evidence of primary stress incontinence or mixed incontinence where the stress component overrides the urgency component Any neurological condition that may interfere with normal bladder function, including stroke, multiple sclerosis, Parkinson's disease, clinically significant peripheral neuropathy, or spinal cord injury (e.g., paraplegia) Urinary tract mechanical obstruction including but not limited to Benign Prostatic Hyperplasia (BPH) Treatment of bladder or pelvic floor dysfunction with botulinum toxin (Botox ®) or surgery in past 12 months Unable to toilet self and have and maintain good personal hygiene Unable to provide clear, thoughtful responses to questions and questionnaires Urinary tract, bladder or vaginal infection or inflammation Hematuria, and absence of an elaborate diagnostic work-up Severe or uncontrolled diabetes (A1C > 8, documented in the last 3 months) or diabetes with peripheral nerve involvement Allergy to local anesthetic or adhesives Bleeding disorder or on an anticoagulant that cannot be stopped for 3 days before the implant Pregnant, lactating, planning to become pregnant, given birth in the past 12 months, or female of child-bearing potential and not practicing a medically-approved method of birth control Skin lesions or compromised skin at the implant or stimulation site Use of investigational drug or device therapy or participation in any study involving or impacting gynecologic, urinary or renal function within past 4 weeks Passive implants (e.g., prostheses) are allowed, but no implanted metal should be at the Neurostimulator implant site Knowledge of planned MRIs, diathermy, or high output ultrasonic exposure Presence of a documented condition or abnormality that could compromise the safety of the patient Any psychiatric or personality disorder at the discretion of the study physician Interstitial cystitis or bladder pain syndrome as defined by the EAU guidelines Life expectancy of less than 1 year

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: OAB<br>Patients with overactive bladder on sacral neuromodulation. | Diagnostic Test: Pelvic floor EMG<br>* Define pelvic floor EMG template measured by probe<br>|
| Experimental: NOUR<br>Patients with non-obstructive urinary retention on sacral neuromodulation. | Diagnostic Test: Pelvic floor EMG<br>* Define pelvic floor EMG template measured by probe<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| EMG activity of pelvic floor muscles in OAB patients and NOUR patients already on SNM | Latency and amplitude of pelvic floor measured by EMG probe | 1 day | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Pelvic floor, Sacral neuromodulation, Electromyography