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Urinary Incontinence — Comprehensive Review

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1. DEFINITION

• It is a symptom, a sign, and a condition
• Prevalence ranges from ~11% in men aged 60–64 years up to 31% in men ≥85 years, and affects up to 32% of men with LUTS; in women it is even more prevalent (20–40%)
• It significantly impairs quality of life, leading to psychological distress, social isolation, and skin complications

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2. TYPES / CLASSIFICATION

A. Stress Urinary Incontinence (SUI)

• Definition: Involuntary leakage of urine on effort, exertion, sneezing, or coughing — i.e., when intra-abdominal pressure exceeds urethral closing pressure without detrusor contraction
• Mechanism: Deficient urethral sphincter mechanism ± urethral hypermobility (in women: weakened pelvic floor due to childbirth, menopause; in men: post-prostatectomy)
• Subtypes:
  • Type I: Leaks with moderate increases in abdominal pressure, no significant urethral hypermobility
  • Type II: Urethral hypermobility (bladder neck descent > 2 cm on Valsalva)
  • Type III: Intrinsic sphincter deficiency (ISD) — severe, continuous leakage at rest or minimal activity

B. Urge Urinary Incontinence (UUI)

• Definition: Involuntary leakage of urine accompanied or immediately preceded by a strong sudden urge to void
• Mechanism: Involuntary detrusor (bladder muscle) contractions (Overactive Bladder, OAB wet)
• Causes: Idiopathic (most common), UTI, bladder stones, neurological disorders (stroke, MS, Parkinson's), bladder carcinoma in situ
• Characteristics: Large volume leaks, frequency, nocturia, urgency

C. Mixed Urinary Incontinence (MUI)

• Definition: Involuntary leakage associated with both urgency and exertion/effort/sneezing/coughing
• Most common type in women
• Treat the predominant component first

D. Overflow Incontinence

• Definition: Involuntary leakage from an overdistended bladder due to failure to empty
• Mechanism: Chronic urinary retention → intravesical pressure exceeds urethral resistance
• Causes:
  • Obstructive: BPH, urethral stricture, bladder neck obstruction
  • Acontractile bladder: Diabetic cystopathy, pelvic surgery (nerve damage), spinal cord injury (lower motor neurone)
• Features: Continuous dribbling, sensation of incomplete emptying, high post-void residual (PVR), paradoxical incontinence

E. Functional Incontinence

• Leakage due to inability to reach the toilet in time despite a normal urinary tract
• Causes: Dementia, severe mobility impairment, depression, sedation
• Common in elderly institutionalized patients

F. Total (Continuous) Incontinence

• Continuous leakage of urine at all times, day and night
• Causes: Vesicovaginal fistula (VVF), ureterovaginal fistula, epispadias, ectopic ureter

G. Nocturnal Enuresis

• Involuntary voiding during sleep; can be primary or secondary

H. Post-Micturition Dribble

• Involuntary loss of urine immediately after finishing voiding; common in men (bulbar urethral pooling)

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3. CLINICAL FEATURES

History

Symptom Assessment Tools

• ICIQ-UI SF (International Consultation on Incontinence Questionnaire - Urinary Incontinence Short Form) — gold standard questionnaire
• Bladder diary (frequency-volume chart over 3 days): records voiding times, volumes, urgency episodes, incontinence episodes, fluid intake

Physical Examination

• General: BMI (obesity worsens SUI), mobility, cognitive function
• Abdominal: Palpable bladder (retention/overflow), lower abdominal masses
• Pelvic (women):
  • Atrophic vaginitis (pale, dry mucosa)
  • Pelvic organ prolapse (cystocele, rectocele, uterine prolapse)
  • Urethral hypermobility / mucosal prolapse
  • Cough stress test: ask patient to cough with a full bladder in lithotomy position — immediate leakage = SUI; delayed = UUI
  • Q-tip test: measures urethral hypermobility (>30° deflection = positive)
• Rectal examination (men):
  • Prostate size, consistency (BPH vs. malignancy)
  • Anal sphincter tone (neurological assessment)
• Neurological: Lower limb reflexes, perineal sensation, bulbocavernosus reflex, saddle anaesthesia (cauda equina)

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4. INVESTIGATIONS

First-Line (All Patients)

Second-Line / Specialist Investigations

Urodynamic Studies (UDS) — Gold Standard for Objective Diagnosis

Imaging

Endoscopy

Neurophysiology (Neurogenic UI)

• EMG of pelvic floor / sphincter
• Nerve conduction studies
• Spinal MRI

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5. MANAGEMENT IN DETAIL

General Principles

• Treat reversible causes first (DIAPERS mnemonic):
  • Delirium, Infection, Atrophic urethritis/vaginitis, Pharmaceuticals, Psychological, Excessive urine output, Restricted mobility, Stool impaction

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A. CONSERVATIVE MANAGEMENT (First-Line for All Types)

1. Lifestyle Modifications

• Weight reduction: 5–10% weight loss → significant reduction in UI episodes (strong evidence)
• Fluid management: Optimize intake (1.5–2 L/day); avoid caffeine, alcohol, carbonated drinks (bladder irritants)
• Smoking cessation: Reduces chronic cough (worsens SUI)
• Treat constipation: Reduces pelvic floor pressure
• Avoid precipitating medications (diuretics, alpha-blockers, CCBs)

2. Bladder Training (UUI/MUI)

• Scheduled voiding with progressive delay of voiding interval by 15–30 min per week
• Target: voiding every 3–4 hours
• Duration: minimum 6 weeks
• Effective in UUI: ~50–80% improvement

3. Pelvic Floor Muscle Training (PFMT) — Kegel Exercises (SUI/MUI)

• Most effective conservative treatment for SUI
• Protocol: 8–12 contractions, 3 sets/day, minimum 15–20 weeks
• Taught with biofeedback, electrical stimulation, or physiotherapy supervision
• Success rates: 60–70% cure/improvement in SUI
• Also effective in UUI (inhibitory reflex on detrusor contraction)

4. Prompted/Timed Voiding

• For functionally impaired patients (dementia, mobility issues)
• Caregiver-assisted toileting at fixed intervals

5. Containment Products

• Absorbent pads, catheters (only as last resort) — manage but do not treat

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B. PHARMACOLOGICAL MANAGEMENT

Stress Urinary Incontinence

Urge Urinary Incontinence / OAB

Overflow Incontinence

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C. MINIMALLY INVASIVE / SURGICAL MANAGEMENT

Stress Urinary Incontinence

Urge Urinary Incontinence / OAB (Refractory)

Overflow Incontinence

• TURP / Laser prostatectomy: Gold standard for BPH obstruction
• Urethrotomy / urethral dilation: Urethral stricture
• Intermittent self-catheterisation (ISC): Neurogenic / acontractile bladder — first-line
• Long-term urethral catheter / suprapubic catheter: When ISC not feasible

Fistula (VVF / Ureterovaginal)

• Surgical repair (transabdominal or transvaginal; Latzko repair for VVF)
• Ureteric reimplantation for ureterovaginal fistula

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D. MANAGEMENT ALGORITHM SUMMARY

URINARY INCONTINENCE
│
├── History + Exam + Urinalysis + PVR + Bladder Diary
│
├── Reversible causes? → Treat first (DIAPERS)
│
├── TYPE?
│    ├── STRESS (SUI)
│    │    ├── Conservative: PFMT × 3 months
│    │    ├── Pharmacological: Duloxetine / Topical oestrogen
│    │    └── Surgical: TVT/TOT sling, AUS (men), bulking agents
│    │
│    ├── URGE (UUI/OAB)
│    │    ├── Conservative: Bladder training, PFMT
│    │    ├── Pharmacological: Antimuscarinics / Mirabegron
│    │    └── Interventional: Botox, SNM, PTNS
│    │
│    ├── MIXED (MUI)
│    │    └── Treat predominant component first
│    │
│    ├── OVERFLOW
│    │    ├── Obstructive: Alpha-blocker → TURP
│    │    └── Acontractile: ISC ± Bethanechol
│    │
│    └── FUNCTIONAL
│         └── Prompted voiding, mobility aids, caregiver support

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E. SPECIAL POPULATIONS

Elderly

• Minimize anticholinergics (cognitive effects) — prefer Mirabegron or Trospium
• Prioritize functional and prompted voiding strategies
• Fall risk from urgency — treat proactively

Neurogenic UI (Spinal cord injury, MS, Parkinson's, stroke)

• Urodynamics mandatory before treatment
• ISC is cornerstone for detrusor-sphincter dyssynergia or acontractile bladder
• Botox widely used
• Video-urodynamics for complex cases
• Monitor upper tracts (renal USS, creatinine) regularly

Pregnancy

• PFMT strongly recommended (prevents postpartum SUI)
• Avoid pharmacological treatment in first trimester

Post-prostatectomy (Men)

• PFMT within 24 hours of catheter removal
• AUS = gold standard if severe/persistent SUI >12 months
• Male sling for mild cases

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6. COMPLICATIONS OF UNTREATED UI

• Skin breakdown, perineal dermatitis, pressure ulcers
• Recurrent UTIs
• Depression, anxiety, social withdrawal
• Falls and fractures (rushing to toilet in UUI)
• Upper urinary tract damage (hydronephrosis, CKD) in chronic overflow

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QUICK REFERENCE TABLE

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