Urinary Incontinence: Classification

Urinary Incontinence: Classification

Urinary Incontinence: Classification

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UI Basics - Leaky Pipes 101

  • Definition: Any involuntary leakage of urine.
  • A common & distressing symptom; significantly impacts quality of life (QoL).
  • Risk factors: ↑ Age, parity, obesity, menopause, previous pelvic surgery.
  • Main classifications:
    • Stress UI (SUI)
    • Urgency UI (UUI) / Overactive Bladder (OAB)
    • Mixed UI (MUI)
    • Overflow UI
    • Functional UI

⭐ Urinary incontinence (UI) is the complaint of any involuntary leakage of urine. It is NOT a normal part of aging, though its prevalence increases with age. Anatomy of the Urinary System

Stress UI - Cough & Sneeze Leaks

  • Involuntary urine loss on effort or exertion (e.g., coughing, sneezing, laughing, lifting).
  • Primary Mechanisms:
    • Urethral Hypermobility: Weak pelvic floor support leads to downward/rotational descent of urethra & bladder neck.
    • Intrinsic Sphincter Deficiency (ISD): Weakness of the urethral sphincter's closing mechanism.
  • Common Risk Factors:
    • Pregnancy, childbirth (especially vaginal).
    • Obesity, chronic cough, constipation.
    • Menopause (↓ estrogen).
    • Previous pelvic surgery.
  • Diagnostic Clues:
    • History of leakage with physical stress.
    • Positive cough stress test (observed leakage).

⭐ In Stress Urinary Incontinence (SUI), a positive Q-tip test (angle > 30 degrees from horizontal with Valsalva) suggests urethral hypermobility. Normal vs. Stress Urinary Incontinence

Urgency UI/OAB - Gotta Go NOW!

  • UUI: Involuntary urine leakage with/preceded by urgency.
  • OAB Syndrome: Urgency (key), often with frequency (>8/24h) & nocturia (>1/night), +/- UUI.
  • Pathophysiology: Detrusor Overactivity (DO) - involuntary bladder contractions during filling.
    • Idiopathic (most common) or Neurogenic.
  • Triggers: 📌 Key-in-lock phenomenon, running water, cold.

⭐ Detrusor overactivity is the most common urodynamic finding in patients with Urgency Urinary Incontinence (UUI); Overactive Bladder (OAB) is a syndrome of urgency, usually with frequency and nocturia, +/- UUI. Overactive Bladder Mechanism

  • Management:
    • Behavioral (bladder training)
    • Meds (antimuscarinics, β3-agonists)
    • Advanced (Botox, neuromodulation)

Mixed & Overflow UI - Combo & The Dam

  • Mixed UI:
    • Combination of Stress UI (SUI) and Urgency UI (UUI).
    • Patient experiences symptoms of both involuntary leakage on effort/exertion AND urgency with leakage.
    • Common, especially in older women.
  • Overflow UI: 📌 (Mnemonic: "The Dam is Full")
    • Involuntary urine loss when bladder pressure exceeds urethral pressure due to bladder overdistension, without detrusor contraction.
    • Causes:
      • Bladder Outlet Obstruction (BOO): e.g., BPH, urethral stricture, severe pelvic organ prolapse.
      • Detrusor Underactivity: e.g., neurogenic (diabetes, MS), myogenic, medications (anticholinergics).
    • Symptoms: Dribbling, weak stream, hesitancy, nocturia, feeling of incomplete emptying.

    ⭐ A post-void residual (PVR) urine volume > 200 mL is often indicative of overflow incontinence or significant bladder emptying dysfunction.

Functional & Transient UI - Odd Jobs & Quick Fixes

  • Functional UI: Due to cognitive/physical impairments (e.g., dementia, immobility) preventing toilet use.
  • Transient UI: Temporary, often reversible causes.
    • 📌 Key: DIAPPERS mnemonic.

⭐ The 'DIAPPERS' mnemonic (Delirium, Infection, Atrophic urethritis/vaginitis, Pharmaceuticals, Psychological, Excess urine output, Restricted mobility, Stool impaction) is crucial for identifying reversible causes of transient incontinence.

High‑Yield Points - ⚡ Biggest Takeaways

  • SUI: Leakage on effort (cough, sneeze); due to urethral hypermobility or Intrinsic Sphincter Deficiency (ISD).
  • UUI: Leakage with urgency; due to detrusor overactivity.
  • MUI: Combination of SUI and UUI symptoms.
  • Overflow Incontinence: Dribbling from overfull bladder; due to detrusor underactivity or bladder outlet obstruction; ↑ PVR.
  • Continuous Incontinence: Constant leakage; suspect urinary fistula (e.g., Vesicovaginal Fistula - VVF).
  • Urodynamics (UDS): Key for complex cases or before incontinence surgery.

Practice Questions: Urinary Incontinence: Classification

Test your understanding with these related questions

A 50-year old woman complains of leakage of urine. Other than genuine stress urinary incontinence, the most common cause of urinary leakage is ?

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Flashcards: Urinary Incontinence: Classification

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Injury to the levator ani muscles results in _____ hypermobility and can result in prolapse of the anterior vaginal wall and the bladder

TAP TO REVEAL ANSWER

Injury to the levator ani muscles results in _____ hypermobility and can result in prolapse of the anterior vaginal wall and the bladder

urethral

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