Genitourinary urinary incontinence

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"urinary incontinence"[MeSH Terms] AND management

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Urinary Incontinence

Definition

Urinary incontinence (UI) is the involuntary leakage of urine sufficient to be a health or social problem. It is one of the most prevalent and underreported conditions in clinical practice. - Goldman-Cecil Medicine, p. 1324

Epidemiology

More than twice as common in women as 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 older adults living at home, one third of those in acute care settings, and >50% of nursing home residents.
Estimated US cost exceeded $83 billion in 2020, with out-of-pocket patient costs >$500.
Over 20 million women in the US are affected; projected to increase by >50% in the coming decade.
Average prevalence by subtype: Stress UI 13%, Urgency UI 5%, Mixed UI 11%. - Berek & Novak's Gynecology, p. 1524

Despite its prevalence and adverse consequences, UI remains largely neglected by both patients and physicians. - Goldman-Cecil Medicine, p. 1324

Prevalence by Subtype and Age

Prevalence of stress, urgency, and mixed urinary incontinence by age group

SUI peaks at age 50 then declines; UUI and MUI increase continuously into late adulthood. Mixed UI becomes the dominant subtype in late adulthood. - Berek & Novak's Gynecology, p. 1524

Classification and Types

Type	Definition	Key Features
Stress UI (SUI)	Involuntary leakage on effort, exertion, sneezing, or coughing	Coincides instantaneously with onset AND cessation of increased abdominal pressure; rare nocturnal leakage
Urgency UI (UUI)	Involuntary leakage associated with a sudden, strong urge to void	May follow sounds of running water, temperature change, arriving home
Mixed UI (MUI)	Leakage associated with both urgency and effort/exertion	Determine most bothersome component to guide treatment
Overflow incontinence	Leakage from an overfull, poorly emptying bladder	Caused by outlet obstruction or detrusor underactivity
Continuous UI	Continuous involuntary urine loss	Suggests fistula (vesicovaginal, urethrovaginal)
Postural UI	Leakage with change in body position	e.g., rising from seated or lying position
Insensible UI	Patient unaware of how leakage occurred	Often neurogenic
Nocturnal enuresis	Involuntary loss during sleep
Coital UI	Loss during intercourse	May occur with penetration or at orgasm

Berek & Novak's Gynecology, p. 1523

Women frequently transition between subtypes: in a large study, over 2 years, 34-38% of those with UUI remitted, while others transitioned to SUI or MUI. - Berek & Novak's Gynecology, p. 1522

Pathophysiology

Normal Continence Requirements

Continence depends not only on lower urinary tract integrity but also on:

Adequate mentation, mobility, motivation, and manual dexterity
These "4 Ms" are rarely deficient in younger patients but commonly impaired in older patients

Age-Related Changes (Predisposing, Not Causative)

Bladder capacity is preserved, but sensation and contractility decrease
Detrusor smooth muscle develops a "dense band pattern" with depleted caveolae - impairs contractility
Incomplete disjunction pattern (protrusion junctions) - underlies high prevalence of involuntary detrusor contractions (overactivity) in older adults
Urethral length and sphincter strength decrease in women
Prostate enlarges in men, causing obstruction in ~50%
Postvoid residual increases (but normally <100 mL)
Older adults excrete most fluid intake at night (nocturia)

None of these changes alone causes incontinence, but all predispose to it. - Goldman-Cecil Medicine, p. 1324-1325

Mechanisms by Type

Detrusor Overactivity (Urge UI):

Most common cause in the elderly (~2/3 of cases)
Histologically: widening of intercellular space, emergence of novel protrusion junctions and ultraclose abutments creating electrical coupling -> involuntary contractions
Usually idiopathic, but may associate with cerebral disease, upper motor neuron lesions, urethral obstruction, bladder calculus, bladder carcinoma
Detrusor Hyperactivity with Impaired Contractility (DHIC) - a subset unique to the elderly: may mimic stress incontinence, outlet obstruction (in men), or overflow; bladder relaxants may precipitate retention

Stress Incontinence:

Reflects insufficient urethral support plus some degree of sphincter weakness
Most common cause in middle-aged women; second most common in older women
In men with radical prostatectomy: resembles "intermittent drip of a leaky faucet"
Goldman-Cecil Medicine, p. 1325-1329

Causes of Transient Incontinence - "DIAPERS" Mnemonic

Letter	Cause	Mechanism
D	Delirium	Incontinence is secondary; resolves when delirium treated
I	Infection (symptomatic UTI)	Acute UTI worsens UI; asymptomatic bacteriuria does NOT
A	Atrophic urethritis/vaginitis	Vaginal erosions, telangiectasia, petechiae; contributes to UI
P	Pharmaceuticals	See drug table below
E	Excess urine output	Large intake, diuretics, caffeine, alcohol; hyperglycemia, hypercalcemia; nocturnal from OSA or peripheral edema mobilization
R	Restricted mobility	Arthritis, pain, foot problems, postprandial hypotension, fear of falling
S	Stool impaction	Causes both fecal and urinary incontinence; resolves with disimpaction

Transient causes account for up to 1/3 of community-dwelling elderly and up to half of hospitalized patients. - Goldman-Cecil Medicine, p. 1328

Medications That Cause or Worsen Incontinence

Drug Class	Effect
Sedative-hypnotics (benzodiazepines, alcohol)	Sedation, delirium, decreased mobility; alcohol also diuresis
Anticholinergics (antihistamines, TCAs, antipsychotics, antispasmodics, anti-Parkinson agents)	Urinary retention, overflow, delirium, constipation
Opiates	Retention, impaction, sedation, delirium
Alpha-adrenergic blockers (prazosin, terazosin)	Relax sphincter -> stress UI in women
Alpha-adrenergic agonists (OTC cold remedies)	Increase outlet resistance -> retention in men
Calcium channel blockers	Reduce detrusor contractility -> voiding problems; peripheral edema -> nocturia
ACE inhibitors	Drug-induced cough -> stress UI in women
Loop diuretics	Polyuria, frequency, urgency
Thiazolidinediones, NSAIDs, gabapentin/pregabalin	Nocturnal diuresis due to fluid retention
Cholinesterase inhibitors	Urinary incontinence
Vincristine	Urinary retention (neuropathy)

Goldman-Cecil Medicine, p. 1328; Berek & Novak's Gynecology, p. 1534

Diagnosis and Evaluation

History

Type of UI (urge, stress, overflow, or mixed)
Frequency, severity, and duration
Pattern (diurnal, nocturnal, postural, positional)
Triggers: coughing, sneezing, urgency, sound of running water
Prior pelvic surgeries, childbirth history, prolapse symptoms
Neurological conditions, medications
Fluid intake (volume, caffeine, alcohol)

Physical Examination

Cough stress test: patient coughs with full bladder while supine/standing; instantaneous leakage confirms SUI
Pelvic exam: atrophic vaginitis, prolapse, pelvic floor tone, urethral hypermobility
Neurological exam: sacral reflexes, perineal sensation

Investigations

First-line (all patients):

Test	Purpose
Urinalysis/culture	Rule out UTI as cause
Postvoid residual (PVR)	Catheter or ultrasound; PVR <50 mL = normal; >150 mL = abnormal; guides management
Bladder diary (2-3 days)	Fluid intake, voiding frequency, voided volumes, incontinence episodes with circumstances; 2-3 days equally reliable as 7 days

Pad test: Pads weighed over 24-48 hours; more objective measure of leakage severity. Longer duration = more reproducible (48-hour correlation coefficient 0.90). Does NOT distinguish stress from urge or capture bother. - Campbell-Walsh Wein Urology, p. 143

Urodynamics (second-line, selected patients):

Not required for straightforward SUI prior to surgery
Indicated when: diagnosis unclear after history/exam/simple testing; complex/mixed symptoms failing conservative therapy; planned prolapse surgery to detect occult SUI; prior anti-incontinence surgery failed; elevated PVR; neurologic conditions (e.g., MS)
Components: uroflowmetry, filling cystometry, pressure-flow studies, urethral pressure profilometry
Berek & Novak's Gynecology, p. 1533-1540; Goldman-Cecil Medicine, p. 1329

Treatment

Treatment requires a multifactorial approach: address precipitants, underlying medical conditions, functional impairments, fluid intake, AND the urinary tract abnormality. Treatment of precipitants alone may restore continence.

1. Lifestyle Interventions (all types)

Fluid and caffeine intake reduction/adjustment
Weight loss (overweight women with SUI)
Smoking cessation (reduces chronic cough -> SUI)
Scheduled voiding (timed toileting)
Bedside urinal for nocturia
Phone-based apps (show promise for urge/mixed UI)

2. Behavioral Therapy

Intervention	Type of UI	Evidence
Pelvic floor muscle training (PFMT/Kegel exercises)	SUI, UUI, MUI	Effective; less effective than surgery for SUI alone; combining with surgery offers no added benefit
Bladder retraining (progressively increasing voiding intervals + urgency suppression techniques)	UUI	As effective as pharmacotherapy for UUI
Prompted voiding	Institutionalized patients with cognitive impairment who can state their name and are partly mobile	Effective for daytime incontinence
Pessaries	SUI	Can be effective as conservative management
Acupuncture	SUI	Some evidence of effectiveness
Group vs. individual education	Both	Equally effective alternative

A 2024 Cochrane systematic review confirmed the effectiveness of PFMT across multiple approaches for UI in women. [PMID: 39704322]

For UUI: behavioral therapy + pharmacotherapy combined is more effective than either alone, since neither abolishes involuntary contractions. - Goldman-Cecil Medicine, p. 1329

3. Pharmacotherapy

For Urgency UI (detrusor overactivity):

Drug Class	Examples	Notes
Antimuscarinics (bladder relaxants)	Oxybutynin, tolterodine, solifenacin, darifenacin, trospium	Modestly and equally effective; ADRs: dry mouth, constipation, visual blurring; use with caution in elderly (cognitive effects); DHIC patients may develop retention
Beta-3 adrenergic agonist	Mirabegron	Alternative/adjunct to antimuscarinics; fewer anticholinergic effects

For Stress UI:

No currently approved pharmacotherapy has proved effective
Duloxetine (SNRI) increases urethral sphincter tone - used in some countries (not FDA-approved for SUI in the US)

For Overflow:

Treat the underlying cause (obstruction: alpha-blockers in men; urinary retention: catheterization, cholinergic agents rarely used)
Goldman-Cecil Medicine, p. 1329-1330

4. Surgical Treatment

Stress UI in women:

Mid-urethral sling (MUS) - retropubic (TVT) or transobturator (TOT) - current gold standard for SUI
Burch colposuspension - open or laparoscopic retropubic suspension
Pubovaginal sling (autologous fascia)
Bulking agents (periurethral injection) - less durable, for patients unfit for surgery or sphincteric deficiency
Artificial urinary sphincter - mainly for intrinsic sphincter deficiency

Urgency UI:

Sacral neuromodulation (SNM) - for refractory OAB
Intradetrusor botulinum toxin A (onabotulinumtoxinA) - effective for refractory UUI; risk of urinary retention
Posterior tibial nerve stimulation (PTNS) - percutaneous or transcutaneous

Overflow/Obstruction:

TURP or other procedures for BPH
Clean intermittent self-catheterization (CISC) for neurogenic or refractory retention

Special Populations

Elderly

Broader multifactorial assessment required
Functional factors (mobility, dexterity, cognition) must be addressed alongside bladder pathology
DHIC common - bladder relaxants may cause retention at standard doses
Anticholinergics pose higher cognitive risk in frail elderly
Catheterization is rarely appropriate for chronic UI due to high UTI risk

Men

UUI from detrusor overactivity and SUI from radical prostatectomy are most common
Post-prostatectomy UI: pelvic floor exercises first line; artificial urinary sphincter for persistent, severe cases
DHIC may mimic prostatic obstruction

Pregnancy/Postpartum

SUI common due to mechanical factors and pelvic floor changes
PFMT is the primary intervention

Impact and Consequences

UI is associated with:

Perineal rashes, pressure ulcers, UTIs
Falls and fractures
Embarrassment, stigmatization, isolation
Depression, anxiety, sexual dysfunction
Risk for institutionalization

Many seriously ill elderly patients rate UI as an outcome worse than death. - Goldman-Cecil Medicine, p. 1324

Key Sources

Goldman-Cecil Medicine International Edition, Ch. 115 (Resnick & Dubeau)
Berek & Novak's Gynecology, Ch. 29
Campbell-Walsh Wein Urology, 3-Volume Set
Hay-Smith et al. [Cochrane 2024 - PMID: 39704322] - PFMT comparisons for UI in women
Moris et al. [Eur Urol 2025 - PMID: 39848866] - Prevalence, diagnosis, and management of SUI in women (current systematic review confirming mid-urethral slings as standard of care)

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