Bladder, Overactive Clinical Trial
Official title:
Genital Nerve Stimulation - GNS - for Treatment of Non-neurogenic OAB
The Genital Nerve Stimulation - GNS - consists of a two-step procedure with a preoperative non-surgical test-phase and a final surgical implantation of the neuroprothesis. In contrast to the classical technique of transcutaneous lead electrode implantation for sacral or pudendal nerve stimulation, the GNS-test-phase does not require any interventional procedure: because the genital nerves are located just few millimeter below the skin, test-stimulation can be achieved using skin surface or needle electrodes. Stimulation is achieved using a battery powered hand-held stimulator . The effect of the stimulation can be tested by the patient in their daily, home and professional environment, or at the practice under urodynamic testing, or if required other electrophysio-logical testing. After confirmation of the effectiveness of GNS, implantation of a permanent neuroprothesis can be planned. The procedure is performed either under general or spinal anesthesia or using only local anesthesia with IV-sedation as in the classical tension-free vaginal tape procedure (TVT). Because the GNS does not require two surgical procedures for both the test- and the final-implantation but rather only one for the final implantation, the presented protocol allows considerable cost reduction in comparison to the usual procedures for sacral or pudendal nerve stimulation.
Pelvic organ dysfunctions are complex and difficult to treat. These conditions affect a
substantial portion of the population, especially with increasing age. The two most frequent
pelvic dysfunctions are the idio-pathic overactive bladder (IOAB) and erectile dysfunction
(ED).
In pelvic dysfunctions, sacral nerve stimulation was the first technique for pelvic nerves
stimulation that typically involves electrical stimulation of the nerve via a dorsal
transformational technique of implantation. SNS evolved as a widely used treatment for OAB
but does not completely resolve symptoms in the majority of patients. Because PNS reach more
"sphincter-vesico-anal" fibers than SNM, PNS has been proposed for patients who have failed
to respond to sacral neuromodulation. The good effects of PNS in neurogenic and in some
non-neurogenic disorders. However, the implantation of a lead to the PN is not easily
accomplished and the risk for lead migration with implantation below the pelvic floor is
increased. So there is definitively a need for a more suitable alternative for selective
stimulation within the pelvic cavity, a method that cannot only be reserved for experts in
this field but for all gynecologists dealing with patients suffering from functional
disorders of the bladder in daily clinical practice. The stimulation of the dorsal nerve of
the pe-nis/clitoris - GNS - emerges as a very attractive alternative that might result in
great outcomes for controlling urinary and fecal disorders.
Because part of the DNP lies superficially to the skin outside the pelvis, this nerve can be
stimulated using surface electrodes attached to the overlying skin of the penis or close to
the clitoris. This application is however limited, due to intolerance to required high
stimulation amplitude. Surface electrodes have limitations such as difficulties in proper
daily placement and issues related to hygiene as well as a lack of acceptance in some
patients. Implanted electrodes are more suitable. However, implanted electrodes in the penis
or near the clitoris, must endure the mechanical stress of penile erections and external
pressure, carrying the risk of the cable/electrode breaking or being dislocated.
The GNS consists of a two-step procedure with a preoperative non-surgical test-phase and a
final surgical implantation of the neuroprothesis. In contrast to the classical technique of
transcutaneous lead electrode implantation for sacral or pudendal nerve stimulation, the
GNS-test-phase does not require any interventional procedure: because the genital nerves are
located just few millimeter below the skin, test-stimulation can be achieved using skin
surface or needle electrodes. Stimulation is achieved using a battery powered hand-held
stimulator . The effect of the stimulation can be tested by the patient in their daily, home
and professional environment, or at the practice under urodynamic testing, or if required
other electro-physiological testing. After confirmation of the effectiveness of GNS,
implantation of a permanent neuroprothesis can be planned. The procedure is performed either
under general or spinal anesthesia or using only local anesthesia with IV-sedation as in the
classical tension-free vaginal tape procedure (TVT). Because the GNS does not require two
surgical procedures for both the test- and the final-implantation but rather only one for the
final implantation, the presented protocol allows considerable cost reduction in comparison
to the usual procedures for sacral or pudendal nerve stimulation.
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