Sacral electrical neuromodulation as an alternative treatment option for lower urinary tract dysfunction

Area of Science:

• Urology
• Neurology
• Biomedical Engineering

Background:

• Temporary electrical stimulation via anal/vaginal electrodes has treated urinary urge incontinence for decades.
• Chronic sacral nerve stimulation (SNS) was introduced in 1981 for refractory lower urinary tract dysfunction.
• SNS involves implanting a sacral foramen electrode and pulse generator for continuous nerve modulation.

Purpose of the Study:

• To evaluate the efficacy of chronic unilateral S3 sacral spinal nerve stimulation for vesicourethral dysfunction.
• To assess long-term symptomatic improvement in patients with urinary retention and motor urge incontinence.
• To compare the sustained therapeutic effects of chronic neuromodulation versus temporary techniques.

Main Methods:

• Chronic unilateral S3 sacral spinal nerve stimulation was applied to 43 patients.
• Patients had a mean postoperative follow-up of 43.6 months.
• Outcomes measured included symptomatic improvement in urinary retention and motor urge incontinence.

Main Results:

• Sustained symptomatic improvement (>50%) was achieved in 72.2% of motor urge incontinence patients (13/18).
• Sustained symptomatic improvement (>50%) was achieved in 85.7% of urinary retention patients (18/21).
• Chronic neuromodulation demonstrated a sustained therapeutic effect not seen with temporary methods.

Conclusions:

• Chronic sacral neuromodulation provides lasting symptom relief for specific urinary dysfunctions.
• It is particularly recommended for patients with urinary retention and those unresponsive to temporary neuromodulation.
• Despite initial costs, chronic SNS is economically viable long-term compared to alternative invasive treatments.