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Electrotherapy Modalities for Urinary Incontinence

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1. Intravaginal / Intrarectal Electrical Stimulation (ES)

• Particularly useful in women who cannot voluntarily contract their pelvic floor muscles — intravaginal ES facilitates volitional contraction and serves as a "biofeedback bridge" (Ignacio Antonio et al., 2022; referenced in EAU Guidelines, p. 123).
• Cochrane review (Stewart et al., 2017) found electrical stimulation with non-implanted devices may reduce stress UI, though evidence quality is moderate.
• RCT (Bø et al., 1999, BMJ): Pelvic floor muscle training was superior to ES alone, but ES still outperformed no treatment.

• Session duration: 20–30 minutes
• Frequency: 3–5×/week initially, then maintenance
• Pulse width: 200–500 µs

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2. Transcutaneous Electrical Nerve Stimulation (TENS)

a. Sacral TENS / Interferential Therapy (IFT)

• Electrodes placed paravertebrally at S2–S4 or suprapubically
• Modulates the micturition reflex via dorsal root entry zone inhibition
• Used primarily for urgency and urge UI

b. Posterior Tibial Nerve Stimulation (PTNS)

• Targets the tibial nerve (L4–S3), which shares sacral nerve roots with the bladder
• Percutaneous PTNS (PTNS): Fine needle electrode near the medial malleolus; 30-min sessions weekly × 12 weeks
• Transcutaneous PTNS (TTNS): Surface electrodes; non-invasive alternative
• Evidence supports improvement in urgency, frequency, and urge UI comparable to antimuscarinic therapy in some trials
• Advantages: Minimally invasive, no systemic side effects, suitable for frail elderly patients

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3. Functional Electrical Stimulation (FES)

• Uses electrical current to produce functional muscle contraction of the pelvic floor and urethral sphincter
• Primarily for stress UI — augments urethral closure pressure during increased intra-abdominal pressure
• Can be combined with pelvic floor muscle training (PFMT) as an adjunct

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4. Neuromuscular Electrical Stimulation (NMES)

• Higher-intensity stimulation producing visible/palpable muscle contractions
• Distinguishable from ES in that it targets motor units more specifically
• Applied via vaginal probe or surface electrodes
• Indicated when voluntary pelvic floor contraction is absent or very weak (e.g., post-partum, post-prostatectomy)

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5. Magnetic Stimulation (Extracorporeal)

• Device: Electromagnetic chair (patient sits fully clothed)
• Stimulates pudendal nerve and pelvic floor muscles non-invasively
• Used for both stress and urgency UI

• Double-blind RCT (Gilling et al., 2009, BJU Int): Electromagnetic stimulation of pelvic floor showed significant improvement in stress UI vs. sham (referenced in EAU Guidelines, p. 123).
• Particularly useful for patients intolerant of intravaginal probes

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6. Electroacupuncture

• Acupuncture needles stimulated with low-frequency electrical current at points such as SP6, BL33, CV3
• Proposed to modulate sacral micturition reflex pathways
• Systematic review and meta-analysis (Lai et al., 2020, J Int Med Res): May improve stress UI in women; evidence is promising but limited by trial quality (EAU Guidelines, p. 123)

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7. Sacral Nerve Stimulation (SNS) / Neuromodulation

• Mechanism: Implanted electrode at S3 foramina continuously modulates micturition reflex
• Indications: Refractory urgency UI, non-obstructive urinary retention, OAB
• High-level evidence supports efficacy for urgency UI refractory to conservative and pharmacologic treatment

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Summary Comparison Table

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Clinical Considerations

• First-line conservative treatment remains PFMT ± biofeedback; electrotherapy is typically an adjunct or used when voluntary contraction is absent.
• ES/NMES is particularly valuable in patients who cannot initiate volitional contraction — it "teaches" the nervous system the correct recruitment pattern (EAU Guidelines on Non-Neurogenic Female LUTS, p. 123).
• PTNS is a well-tolerated option for frail elderly patients where pharmacotherapy carries anticholinergic risks.
• For neurogenic incontinence, NMES and sacral neuromodulation have expanded roles.
• Combination therapy (e.g., PFMT + ES, or PFMT + biofeedback + ES) generally yields better outcomes than any single modality alone.

References: EAU Guidelines – Management of Non-Neurogenic Female LUTS (p. 123); Bailey & Love's Short Practice of Surgery, 28th Ed. (p. 1521); Bø et al., BMJ 1999; Stewart et al., Cochrane 2017; Gilling et al., BJU Int 2009; Ignacio Antonio et al., J Physiother 2022.

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Procedure & Parameters of Electrotherapy Modalities for Urinary Incontinence

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1. Intravaginal / Intrarectal Electrical Stimulation (ES)

Procedure

1. Patient positioning: Supine with knees flexed (crook lying), or semi-reclined.
2. Probe selection: Intravaginal probe for women; intrarectal probe for men or women who cannot tolerate vaginal insertion.
3. Probe insertion: Lubricate and insert the probe fully into the vagina/rectum; ensure good mucosal contact.
4. Circuit check: Attach leads to stimulator; confirm impedance within acceptable range (typically < 1 kΩ).
5. Intensity titration: Increase current slowly until the patient reports a clear pelvic floor contraction (for stress UI) or a tolerable tingling sensation (for urgency UI). Never cause pain.
6. Session: Patient rests during stimulation; active exercises can be added between pulses for motor protocols.
7. Post-session: Remove and clean probe with appropriate disinfectant; reassess symptoms.

Parameters

Rationale for frequencies: High frequency (35–50 Hz) produces tetanic pelvic floor contraction (Type I & II fiber recruitment) for urethral closure. Low frequency (5–10 Hz) activates the pudendo-detrusor inhibitory reflex, suppressing detrusor overactivity.

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2. Transcutaneous Electrical Nerve Stimulation (TENS) — Sacral / Perineal

Procedure

1. Electrode placement:
   • Sacral TENS: Two electrodes paravertebrally at S2–S4 level (approximately at the level of posterior superior iliac spine, medial aspect); or one suprapubic + one sacral.
   • Perineal TENS: Electrodes placed on the perineum bilaterally.
2. Ensure clean, dry skin; apply conductive gel or self-adhesive electrodes.
3. Increase intensity to comfortable sensory level (tingling, no pain or muscle twitch for inhibitory protocols).
4. Patient may be treated in supine or seated position.

Parameters

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3. Posterior Tibial Nerve Stimulation (PTNS)

Percutaneous PTNS (P-PTNS) — Procedure

1. Patient positioning: Seated, leg slightly externally rotated, ankle resting on the contralateral knee.
2. Landmark: 3–4 cm cephalad to the medial malleolus, just posterior to the medial tibial border.
3. Needle insertion: Insert a 34-gauge fine needle at a 60° angle, approximately 3–4 cm deep, aiming cephalad toward the posterior tibial nerve.
4. Grounding electrode: Self-adhesive surface electrode placed on the same foot (plantar aspect, near the arch).
5. Confirmation of correct placement: Flexion of the great toe or fanning of all toes (somatic response), or tingling in the sole of the foot.
6. Connect to stimulator and apply current.
7. After the session, withdraw needle and apply light pressure.

P-PTNS Parameters

Transcutaneous PTNS (T-PTNS) — Procedure

1. Place two self-adhesive electrodes over the same tibial nerve region (medial aspect above the ankle).
2. No needle required — suitable for home use after education.
3. Patient self-administers sessions.

T-PTNS Parameters

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4. Neuromuscular Electrical Stimulation (NMES)

Procedure

• Same probe placement as intravaginal ES (above).
• Intensity is set above motor threshold — producing a visible or palpable pelvic floor contraction.
• Patient may be asked to voluntarily contract pelvic floor muscles during the electrical stimulus (volitional augmentation) to maximize motor learning.
• Surface NMES option: electrodes placed on the inner thighs or perineum if intravaginal route is contraindicated.

Parameters

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5. Extracorporeal Magnetic Stimulation (EMS)

Procedure

1. Patient sits fully clothed on a specially designed electromagnetic chair.
2. The coil beneath the seat generates a pulsed magnetic field focused on the pelvic floor.
3. No probe, no skin preparation required — non-invasive and well tolerated.
4. Produces involuntary pelvic floor contractions.

Parameters

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6. Interferential Therapy (IFT)

Procedure

1. Four electrodes placed in a quadripolar arrangement around the pelvis:
   • Two electrodes on the lower abdomen (suprapubically)
   • Two electrodes on the inner thighs or lower sacrum
2. Two medium-frequency currents (e.g., 4000 Hz and 4100 Hz) intersect deep in the pelvic floor tissue, producing a beat frequency of 100 Hz (adjustable).

Parameters

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7. Sacral Nerve Stimulation (SNS) / Neuromodulation — Overview of Procedure

Stage 1 — Test Stimulation

1. Under fluoroscopic guidance, a tined lead is placed percutaneously into the S3 foramen.
2. Correct placement confirmed by bellows contraction of the levator ani and plantar flexion of the ipsilateral great toe.
3. External trial stimulator worn for 2–4 weeks to assess response (≥50% improvement = success).

Stage 2 — Permanent Implant

1. If test phase successful, a pulse generator (IPG) is implanted subcutaneously in the upper buttock.

Parameters (Approximate)

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Contraindications Across Modalities

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Quick Reference Summary

Sources: EAU Guidelines – Non-Neurogenic Male LUTS (p. 64); EAU Guidelines – Non-Neurogenic Female LUTS (p. 123); Bailey & Love's 28th Ed. (p. 1521); Gilling et al., BJU Int 2009; Stewart et al., Cochrane 2017.