Stress Urinary Incontinence

SUI: Definition & Scope - Leaky Laughs

• Symptom: Involuntary urine leakage during activities that ↑ intra-abdominal pressure (e.g., coughing, sneezing, laughing, exertion).
• Pathophysiology:
  • Urethral hypermobility: Insufficient support from pelvic floor fascia/muscles.
  • Intrinsic Sphincter Deficiency (ISD): Weakness of the urethral sphincter itself.
• Commonest type in women.

⭐ Stress Urinary Incontinence (SUI) is the most common type of urinary incontinence in adult women.

SUI: Pathophysiology - Faulty Plumbing

• Key Mechanisms:
  • Urethral Hypermobility (UH): Poor anatomical support.
  • Intrinsic Sphincter Deficiency (ISD): Weak urethral sphincter.
• Urethral Hypermobility (UH):
  • Cause: Weak pelvic floor → ↓ urethral support.
  • Path: ↑IAP → urethral descent → ineffective pressure transmission.
  • Result: Vesical pressure > urethral pressure → leakage.
• Intrinsic Sphincter Deficiency (ISD):
  • Cause: Weak urethral sphincter → poor coaptation & ↓ closure pressure.
  • Result: Leakage with minimal ↑IAP, despite support.
  • Etiology: Neuropathy, surgery, radiation, aging.

⭐ The two main pathophysiological mechanisms for SUI are urethral hypermobility and intrinsic sphincter deficiency (ISD).

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SUI: Diagnosis - The Drip Detectives

• History: Leakage with cough, sneeze, exertion.
• Clinical Examination:
  • Cough Stress Test (CST): Observe leakage with cough (full bladder).
  • Pelvic exam: Check for Pelvic Organ Prolapse (POP), atrophy.
  • Q-tip Test: Urethral angle change >30-35° with Valsalva indicates hypermobility.
• Investigations:
  • Urinalysis & culture: Rule out UTI.
  • Post-Void Residual (PVR): Check bladder emptying.
  • Voiding diary: Track leakage, frequency.
• Urodynamics (UDS): Consider for complex SUI, prior failed surgery, or diagnostic uncertainty; not routine.

⭐ A positive Q-tip test, showing a urethral angle change of >30-35 degrees with Valsalva, suggests urethral hypermobility.

SUI: Urodynamics - Urodynamics Unveiled

• Purpose: Objectively assesses lower urinary tract function; not routine for uncomplicated SUI.
• Indications: Complex cases (e.g., failed surgery, neurogenic bladder, significant urge component, diagnostic uncertainty).
• Key Tests:
  • Cystometry: Evaluates bladder filling/storage (sensation, capacity, compliance, detrusor overactivity).
  • Uroflowmetry: Measures urine flow rate.
  • Pressure-flow studies: PdetQmax.
  • Valsalva Leak Point Pressure (VLPP).

⭐ Valsalva Leak Point Pressure (VLPP) <60 cm H2O on urodynamics is highly suggestive of Intrinsic Sphincter Deficiency (ISD).

SUI: Management - Treatment Toolkit

• Conservative First-Line:
  • Lifestyle: Weight loss (if BMI >30), ↓caffeine, fluid management.
  • Pelvic Floor Muscle Training (PFMT): 📌 Squeeze to Please! Kegels; 8 contractions, 3x/day for ≥3 months.
  • Vaginal Pessaries: Mechanical support.
  • Bladder Training.
• Pharmacological (Limited Role):
  • Duloxetine: Modest benefit, consider if surgery contraindicated/declined.
• Surgical Intervention (Gold Standard for Mod-Severe SUI):
  • Mid-Urethral Slings (MUS): TVT (retropubic), TOT (transobturator).
  • Burch Colposuspension: Abdominal approach.
  • Autologous Fascial Slings.
  • Injectable Bulking Agents: Less invasive, lower efficacy.

⭐ Mid-urethral slings (TVT, TOT) are the gold standard surgical treatment for SUI due to high efficacy and minimally invasive nature.

High‑Yield Points - ⚡ Biggest Takeaways

• Stress Urinary Incontinence (SUI) is involuntary urine loss with ↑ intra-abdominal pressure (e.g., coughing, sneezing).
• Most common type of urinary incontinence in younger women.
• Key causes: Urethral hypermobility (most common, due to pelvic floor weakness) and Intrinsic Sphincter Deficiency (ISD).
• Diagnosis: Positive cough stress test; Q-tip test >30 degrees suggests hypermobility.
• First-line treatment: Pelvic Floor Muscle Training (PFMT/Kegel exercises).
• Gold standard surgery: Mid-Urethral Slings (MUS), such as TVT (Tension-free Vaginal Tape) or TOT (Transobturator Tape).
• For ISD, consider periurethral bulking agents or an autologous fascial sling (pubovaginal sling).