Intraoperative cavernous nerve stimulation during nerve sparing radical prostatectomy: how and when?

Area of Science:

• Urology
• Surgical Innovation
• Neuro-oncology

Background:

• Nerve-sparing prostatectomy aims to preserve erectile function, but outcomes are often suboptimal.
• Optimizing nerve sparing is crucial, as evidenced by studies linking sildenafil response to bilateral nerve preservation.
• Cavernous nerves are challenging to visualize during surgery due to their variable course.

Purpose of the Study:

• To evaluate the efficacy of intraoperative cavernous nerve stimulation for predicting erectile function recovery after prostatectomy.
• To assess the performance of a novel device, Cavermap, for real-time nerve stimulation and tumescence monitoring during surgery.

Main Methods:

• A phase 2 and phase 3 randomized, multicenter study compared Cavermap-assisted prostatectomy with conventional nerve-sparing techniques.
• Intraoperative nerve stimulation was used to assess neural continuity and predict recovery.
• Nocturnal penile tumescence was monitored using Rigiscan at 1-year follow-up.

Main Results:

• Intraoperative proximal nerve stimulation successfully identified maintained neural continuity, predicting erectile function recovery.
• Cavermap-assisted surgery demonstrated a significant benefit in the duration of nocturnal tumescence compared to conventional methods at 1 year.
• A tumescent response to nerve stimulation, though sometimes subtle, was consistently demonstrable.

Conclusions:

• Intraoperative cavernous nerve stimulation is a valuable tool for assessing nerve integrity and predicting post-prostatectomy erectile function.
• The Cavermap device offers a promising approach to enhance nerve sparing during prostatectomy, leading to improved functional outcomes.
• Further research into nerve grafting and alternative nerve monitoring techniques is warranted.