Sacral Neuromodulation for Refractory Overactive Bladder: Closing the Gaps in Anatomy, Mechanisms, and Parameter...

Area of Science:

• Urology
• Neuroscience
• Biomedical Engineering

Background:

• Sacral neuromodulation (SNM) is a recognized treatment for overactive bladder (OAB).
• Current understanding of SNM's mechanisms and optimal parameters is insufficient.
• Technological advancements have not significantly improved long-term symptom control rates.

Purpose of the Study:

• To highlight critical knowledge gaps in sacral neuromodulation for overactive bladder.
• To emphasize the need for improved understanding of SNM's underlying mechanisms and anatomical factors.
• To propose a path toward developing more effective SNM protocols and electrode designs.

Main Methods:

• Analysis of 45 clinical studies on sacral neuromodulation from 1994 to 2023.
• Review of recent studies (2015 onwards) focusing on test stimulation outcomes.
• Identification of persistent knowledge gaps regarding anatomy, pathways, and predictors of success.

Main Results:

• No significant improvement in long-term symptom control rates observed over three decades.
• Over 40% of patients do not benefit from test stimulation in recent studies.
• Programming protocols remain largely unchanged since FDA approval in 1997.

Conclusions:

• Significant knowledge gaps persist regarding sacral nerve anatomy, neural pathways, and anatomical variations' impact on SNM outcomes.
• Developing detailed computational models and systematic outcome documentation is proposed to enhance SNM efficacy.
• Bridging these gaps is essential for improving consistency and effectiveness of SNM for refractory overactive bladder.