Intra-operative Assessment of Cavernosal Nerve Stimulus Threshold

Study Overview
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Brief Summary
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Erectile dysfunction persists in approximately 80% of men 1 year after prostatectomy. Various erectile rehabilitation strategies have not provided benefit. Electrical stimulation has been demonstrated to benefit neuroregeneration and the functional recovery of neuromuscular systems. Therefore, electrical stimulation of the cavernosal nerves during radical prostatectomy is being investigated for its potential development into a treatment aimed at improving recovery of erectile function after prostatectomy. This pilot study is intended to determine the threshold of electrical stimulation that results in penile erection, as defined by persistent intracavernosal pressure increase, such that future studies of sub-threshold stimulation may be pursued.

Detailed Description
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Objective: To determine the cavernosal nerve electrical stimulation amplitude thresholds at which an erection, as indicated by persistent increases in intracavernosal pressure, occurs for various stimuli of fixed frequency and fixed pulse-width. Study Design: This is a prospective pilot study used to determine a threshold range of cavernosal nerve electrical stimulation parameters that result in penile erection. Assignment to the order of stimulation paradigms will be randomized. No placebos are used. No blinding is used.

Official Title
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Intra-operative Assessment of Cavernosal Nerve Stimulus Threshold

Conditions
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Prostatectomy

Intervention / Treatment
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* Device: 10Hz + 100 micro-seconds
* Device: 10Hz + 200 micro-seconds
* Device: 7Hz + 100 micro-seconds
* Device: 7Hz + 200 micro-seconds


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subjects must have prostate cancer being treated via radical prostatectomy by a single surgeon (primary investigator) with planned intraoperative nerve sparing. Subjects must have intact preoperative erectile function, sufficient for penetrative intercourse without medication nor assistive device, as defined by a Sexual Health Inventory for Men (SHIM) / International Index of Erectile Function (IIEF-2) score 22 or higher, which is collected as part of routine care. Subjects must have the ability to understand and the willingness to sign a written informed consent document. Exclusion Criteria: Baseline erectile dysfunction, as defined by the use of medications or devices to assist erection, lack of baseline erections, or a SHIM / IIEF-2 21 or lower, which is collected as part of routine care. Lack of successful intraoperative nerve sparing. Neurologic, metabolic, or vascular diseases that may negatively impact erectile function, such as: diabetes mellitus, peripheral vascular disease, coronary artery disease, stroke, multiple sclerosis, parkinson's disease, multiple systems atrophy, epilepsy, or spinal cord injury. Inability to provide a fully informed consent.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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Male

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: Supportive Care
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Electrical Stimulation<br>Each participant will be given 4 electrical stimulants with an amplitude ranging from 1mA to 30mA. The maximum stimulus without causing an erection will be recorded | Device: 10Hz + 100 micro-seconds<br>* 10Hz Electrical Stimulation with a pulse width of 100 micro-seconds<br>Device: 10Hz + 200 micro-seconds<br>* 10Hz Electrical Stimulation with a pulse width of 200 micro-seconds<br>Device: 7Hz + 100 micro-seconds<br>* 7Hz Electrical Stimulation with a pulse width of 100 micro-seconds<br>Device: 7Hz + 200 micro-seconds<br>* 7Hz Electrical Stimulation with a pulse width of 200 micro-seconds<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maximum Cavernosal Nerve Stimulation Threshold | Median value of maximum stimulation pattern men received prior to erection in responders | Up to 21 days after prostatectomy | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Erectile Disfunction, Urinary Function