This is a prospective study. Subjects will be recruited from the urology practices of Dr.
Ken Peters and Dr. Ananias Diokno at William Beaumont Hospital. Subjects will be referred to
the study by the clinician recommending Sacral NeuroModulation therapy (SNM).
This pilot study is to explore the effect of SNM on sensory pathways by measuring CPT values
pre and post SNM treatment.
Patients will be scheduled 1-2 weeks prior to planned implantation of the SNM wire electrode
(Stage 1). Patients that do not have a 50% improvement in their symptoms in Stage 1 will not
go on to Stage II procedures and will not undergo further CPT testing.
After enrollment, the subjects will complete a short medical history questionnaire
confirming that they meet inclusion criteria and do not fall under exclusion criteria. This
will include review of recent urinalysis and/or urine culture confirming the absence of a
recent urinary tract infection. Participants will be given information on the relevant CPT
testing including the need for bladder/urethra catheterization as part of that testing pre
and post SNM therapy.
At the baseline testing visit, subjects will undergo CPT testing using transcutaneous
stimulation in the distribution of the pudendal nerve on the perineum. Subjects will
undergo bladder/urethral catheterization in using standard sterile technique. Once the
bladder/urethral catheter is in place CPT testing will be conducted at various frequencies
of to identify the current perception thresholds of each nerve fiber.
At the conclusion of the testing the catheter will be removed and the subjects will be given
a single dose of an oral antibiotic to minimize infection. This meeting and testing will
require approximately 60 minutes.
Patients will undergo Stage I of the SNM procedure with their own physician at a subsequent
If subjects have a 50% improvement in their symptoms after 2 weeks with Stage 1 SNM, they
will under go Stage II of the SNM procedure.
The subjects will have an appointment scheduled for their follow-up CPT testing at the
clinical research office 4 to 6 weeks after the Stage II procedure. The subject will be
given a urinalysis and urine culture lab slip, and will be instructed to drop a urine sample
off at the lab 3 days before their scheduled appointment for testing. If their urine culture
is positive, they will be given a prescription for an antibiotic and excluded from this
testing. They may however be tested once their urine culture is negative, as long as it is
within 2 weeks of their original post-stage 2 CPT test appointment
Subjects will undergo repeat CPT testing using transcutaneous stimulation in the
distribution of the pudendal nerve on the perineum. Subjects will then undergo
bladder/urethral catheterization using standard sterile technique. Once the
bladder/urethral catheter is in place CPT testing will then be conducted at various
frequencies to identify the current perception thresholds of each nerve fiber.
At the conclusion of the testing the catheter will be removed and the patients will be given
a single dose of an oral antibiotic to minimize infection. This evaluation will require
approximately 60 minutes.
- Established diagnosed overactive bladder
- Scheduled to receive SMN therapy by Dr. Peters or Dr. Diokno
- Women at least 18 years of age
- Capable of giving informed consent
- Capable and willing to follow all study related procedures (e.g. bladder and urethral
catheterization, answering questions during CPT testing, complete questionnaires
regarding pertinent medical history).
- Current Urinary tract infection
- Currently participating or have participated within the past 30 days in any clinical
investigation involving or impacting urinary or renal function.
- Pregnancy or intending to become pregnant during the study
- Cannot independently comprehend and complete relevant medical history questionnaires.
- The subject is deemed unsuitable for enrollment in this study by the investigators
based on their history.
- Men are excluded
- TENS, PTNS or acupuncture therapy currently being used for symptoms