Intraoperative cavernous nerve stimulation and Laser-Doppler flowmetry during radical prostatectomy

Area of Science:

• Urology
• Surgical Innovation
• Neuroscience

Background:

• Erectile dysfunction is a common complication after radical prostatectomy, often caused by damage to pelvic autonomic nerves.
• Intraoperative electrical stimulation of cavernous nerves, with penile girth measurement, has been used to assess nerve integrity.

Purpose of the Study:

• To evaluate the feasibility of using Laser Doppler flowmetry to record changes in glans penis blood flow in response to cavernous nerve stimulation.
• To assess the potential of this technique for intraoperative nerve assessment during prostatectomy.

Main Methods:

• Electrical stimulation of the neurovascular bundles was performed in 15 patients undergoing radical prostatectomy.
• Changes in penile blood flow were measured using a Laser Doppler probe on the glans penis.
• Penile girth changes were simultaneously recorded, and erectile function was assessed at 3 months post-surgery.

Main Results:

• Laser Doppler flowmetry detected stimulus-induced increases in penile blood flow in 10 out of 15 patients.
• Six patients with detected blood flow increases reported preserved erectile function at 3 months.
• Three patients with no Doppler response had no preserved erectile function, indicating true negatives.

Conclusions:

• Laser Doppler flowmetry is a feasible method for detecting increased penile blood flow during intraoperative cavernous nerve stimulation.
• The technique shows potential for confirming autonomic nerve sparing during pelvic surgery, including in women.
• Further refinements in recording techniques are necessary for optimal application.