Urinary Incontinence

Definition

Epidemiology

• More than twice as common in women as in men
• Prevalence increases with age: at least some degree of UI is reported by 11% of women aged 22-27 years
• Afflicts 15-30% of community-dwelling older adults, one third of those in acute care settings, and >50% of nursing home residents
• Estimated cost in the United States exceeded $83 billion in 2020, with out-of-pocket costs >$500 per patient
• Predisposes to: perineal rashes, pressure ulcers, UTIs, falls and fractures
• Associated with: embarrassment, stigmatization, isolation, depression, anxiety, sexual dysfunction, and risk for institutionalization

Pathophysiology

1. Integrity of lower urinary tract function (bladder + sphincter)
2. Adequate mentation, mobility, motivation, and manual dexterity

• Bladder capacity unchanged, but bladder sensation and contractility decrease
• Detrusor smooth muscle develops a "dense band pattern" with depleted caveolae
• Incomplete disjunction pattern (protrusion junctions) underlies involuntary detrusor contractions
• Urethral length and sphincter strength decrease in women
• Prostate enlarges in men (obstruction in ~50%)
• Postvoid residual (PVR) increases in both sexes (normally <100 mL)
• Older persons often excrete most fluid at night, compounding nocturia

Classification and Types

1. Urge Incontinence (Overactive Bladder / Detrusor Overactivity)

• Most common type in older adults (~2/3 of elderly cases)
• Leakage follows abrupt onset of urgency; typically moderate to large volume
• Associated with urinary frequency (>8 voids/day) and nocturia
• Caused by involuntary detrusor contractions; usually idiopathic but can be associated with cerebral disease, upper motor neuron lesions, urethral obstruction, bladder calculus, or bladder carcinoma
• Subtype in elderly: Detrusor hyperactivity with impaired contractility (DHIC) - involuntary contractions but weak bladder; can masquerade as stress incontinence or prostatic obstruction

2. Stress Urinary Incontinence (SUI)

• Second most common in older women; dominant cause in middle-aged women
• Leakage coincides instantaneously with onset and cessation of cough, sneeze, or increased abdominal pressure
• Nocturnal leakage is rare
• Caused by urethral hypermobility (descent of bladder neck/urethra) or intrinsic sphincter deficiency (ISD)
• In men: most often follows radical prostatectomy (post-prostatectomy incontinence, PPI)

3. Mixed Incontinence

• Features of both stress and urge incontinence
• Treatment should target the most bothersome component first

4. Overflow Incontinence

• From urinary retention (impaired detrusor contractility or outlet obstruction)
• Presents as continuous dribbling or frequent small-volume leakage
• Common in men with BPH or neurogenic bladder

5. Functional Incontinence

• Leakage due to impaired mobility, cognition, or motivation in a patient whose lower urinary tract may be intrinsically normal

6. Transient Incontinence (DIAPPERS mnemonic)

Diagnosis

History

• Type, frequency, volume, timing of leakage
• Precipitants (cough, urgency, position change)
• Fluid and caffeine intake
• Medications review

Bladder Diary

• Records voiding times, volumes, incontinence episodes, and activities
• Identifies patterns (e.g., morning diuretic timing, nocturnal polyuria)

Physical Examination

• Abdominal exam (palpable bladder), pelvic/rectal exam
• Neurologic exam
• Provocation test (cough stress test): observe for leakage with cough in full bladder

Investigations

• Urinalysis/MSU - exclude infection, hematuria, glucosuria
• Postvoid residual (PVR) - by ultrasound or catheter; >200 mL suggests overflow or DHIC
• Urodynamics - reserved for diagnostic uncertainty or before surgery; not routine in straightforward presentations
• Cystoscopy/imaging - if hematuria, recurrent UTI, pelvic pain, or prior pelvic radiotherapy

Treatment

Step 1: Lifestyle Interventions (All Types)

• Fluid optimization (reduce excess intake; avoid restriction that causes UTI)
• Caffeine reduction
• Weight loss in overweight women (strong evidence for SUI)
• Smoking cessation
• Timed/prompted voiding in elderly or cognitively impaired patients
• Bladder diary self-monitoring
• Pessary (for SUI in women with prolapse)

Step 2: Behavioral Therapy

• Pelvic floor muscle training (PFMT / Kegel exercises) - first-line for SUI and urge UI; evidence-based, effective at all ages. A 2024 systematic review in Sports Health (PMID 37688407) confirms efficacy in women.
• Bladder retraining - progressively increasing voiding intervals + urgency-suppression strategies; effective for urge UI
• As effective as pharmacotherapy for urge UI; combining both is more effective than either alone

Step 3: Pharmacotherapy

For Urge Incontinence / Overactive Bladder:

• Immediate-release oxybutynin has the quickest onset - useful for predictable leakage episodes
• Patients on cholinesterase inhibitors (dementia): consider a non-anticholinergic agent

For Stress Incontinence:

• Duloxetine (SNRI; off-label in many regions) - modest efficacy via pudendal nerve stimulation of external urethral sphincter
• Topical estrogen in postmenopausal women - improves urethral/vaginal atrophy
• No currently approved oral drugs are consistently effective for SUI

For Overflow Incontinence:

• Treat the underlying cause (alpha-blockers or 5-alpha-reductase inhibitors for BPH; clean intermittent catheterization for neurogenic retention)

Step 4: Surgical Options (after failed conservative/medical therapy)

Women with SUI:

• Mid-urethral sling (MUS) - tension-free vaginal tape (TVT) or transobturator approach; current gold standard for SUI in women
• Colposuspension (Burch) - open or laparoscopic; durable results
• Bulking agents - urethral injection; less durable, suitable for selected patients

Men with SUI (post-prostatectomy):

• Artificial urinary sphincter (AUS) - gold standard for moderate-severe PPI
• Male sub-urethral sling (fixed or adjustable) - for mild-moderate PPI

For Urge Incontinence refractory to medications:

• OnabotulinumtoxinA (Botox) intravesical injection - 100-200 U; effective for 6-12 months; risk of urinary retention
• Sacral neuromodulation (SNM / InterStim) - implantable device; sustained efficacy
• Percutaneous posterior tibial nerve stimulation (P-PTNS) - less invasive neuromodulation option
• Bladder augmentation / urinary diversion - last resort for refractory cases

EAU Management Algorithm for Men (Conservative and Surgical)

Special Populations

Elderly / Frail Patients

• Incontinence in older patients is more related to comorbid disease and functional impairment than to aging itself
• Treat precipitants first (arthritis, heart failure, medications, delirium)
• Prompted voiding effective for cognitively impaired but partly mobile institutionalized patients
• Use anticholinergics with caution (cognitive effects); prefer beta-3 agonists
• Avoid chronic urinary catheters (high UTI risk)

Men

• Assess for BPH/lower urinary tract obstruction (IPSS, DRE, PVR, uroflowmetry)
• Post-prostatectomy incontinence: pelvic floor exercises initially; AUS or sling if persistent

Women

• Pelvic floor assessment, pelvic organ prolapse evaluation
• Discuss pessary options
• Topical vaginal estrogen post-menopause
• Mid-urethral sling is highly effective surgical option

Key Points

1. UI is very common, underreported, and undertreated - always screen in at-risk patients
2. Always address reversible/transient causes first (DIAPPERS)
3. Behavioral therapy (PFMT + bladder training) is first-line and highly effective
4. Urge UI responds to antimuscarinics or mirabegron; behavioral therapy is equally effective
5. Stress UI responds best to PFMT and, when refractory, to surgery (mid-urethral sling in women, AUS in men)
6. Urodynamics is NOT routinely required before initiating conservative treatment
7. Urinary catheters are rarely indicated for chronic UI management