15.2 Pelvic Organ Prolapse & Urinary Incontinence
Key Takeaways
- Cystocele is the most common prolapse, and digital splinting to achieve complete defecation is the hallmark symptom of a significant rectocele.
- Stress incontinence leaks small volumes synchronously with coughing or exertion and has a normal post-void residual under 50 mL.
- Urgency incontinence follows a sudden compelling urge with moderate to large volume loss, daytime frequency above 8 voids, and nocturia of 2 or more.
- Overflow incontinence produces continuous dribbling with a markedly elevated post-void residual above 200 to 300 mL and requires bladder decompression.
- Pelvic floor muscle training is first-line for stress incontinence, while behavioral therapy with timed voiding and bladder retraining is first-line for urgency incontinence.
Last updated: September 2026
Pelvic Organ Prolapse (POP): Anatomy, Staging & Non-Surgical Care
Pelvic organ prolapse is the downward herniation or descent of the pelvic viscera (bladder, uterus, vaginal cuff, bowel, rectum) into or through the vaginal canal, resulting from attenuation or damage to the pelvic floor muscular diaphragm (levator ani muscle complex) and endopelvic connective tissue supports (uterosacral-cardinal ligament complex and pubocervical/rectovaginal fascia).
Compartmental Classification
- Anterior Compartment: Cystocele (herniation of the anterior vaginal wall allowing bladder descent) and urethrocele (urethral hypermobility). Most common type of prolapse.
- Apical Compartment: Uterine prolapse (herniation of the cervix and uterus down the vaginal axis) or vaginal vault prolapse (descent of the vaginal apex following prior total hysterectomy).
- Posterior Compartment: Rectocele (herniation of the rectovaginal septum and posterior vaginal wall allowing the rectum to bulge into the vagina) and enterocele (herniation of the peritoneal sac of the pouch of Douglas, containing loops of small intestine, dissecting between the anterior rectal and posterior vaginal walls).
- Hallmark Symptom of Rectocele — Digital Splinting: Patients with a moderate-to-severe rectocele characteristically report obstructed defecation and tenesmus, requiring them to insert a finger into the vagina or press on the perineal body (digital splinting) to manually reduce the bulge and achieve complete evacuation of stool.
Staging Systems: Baden-Walker vs. POP-Q
- Baden-Walker Halfway System: Clinically intuitive 0 to 4 grading system based on maximal protrusion relative to the hymenal ring: Grade 0 (normal position), Grade 1 (descent halfway to hymen), Grade 2 (descent to hymen), Grade 3 (descent halfway past hymen), Grade 4 (complete procidentia / maximum descent).
- POP-Q (Pelvic Organ Prolapse Quantification) System: The international standard objective staging system that measures 9 specific anatomical points relative to the hymenal plane (expressed in centimeters, where proximal/inside points are negative numbers, the hymen is 0, and distal/protruding points are positive numbers):
- Stage 0: No prolapse demonstrated (points Aa, Ap, Ba, Bp at -3 cm; C between -tvl and -(tvl - 2)).
- Stage I: Most distal portion of the prolapse is >1 cm above the level of the hymen (less than -1 cm).
- Stage II: Most distal portion is between 1 cm above and 1 cm below the hymen (-1 cm to +1 cm).
- Stage III: Most distal portion extends >1 cm below the hymen, but protrudes no further than 2 cm less than the total vaginal length (tvl).
- Stage IV: Complete procidentia / eversion of the total length of the lower genital tract (protrusion ≥ tvl - 2 cm).
Non-Surgical Midwifery Management of POP
- Pelvic Floor Muscle Training (PFPT / Kegel Exercises): First-line therapy for symptomatic Stage I and II prolapse. Structured contraction and relaxation of the pubococcygeus and levator ani musculature increases pelvic floor muscle tone, endurance, and structural support, preventing progression and alleviating dragging pelvic pressure.
- Pessary Fitting & Management: Silicone mechanical support devices inserted into the upper vagina to reposition prolapsed organs.
- Support Pessaries (Ring with Support, Shaatz): First-line for mild to moderate prolapse and cystoceles. Highly flexible; patients can easily learn to remove, clean, and reinsert them independently at home.
- Space-Occupying Pessaries (Gellhorn, Cube): Indicated for severe prolapse (Stage III and IV procidentia) or when a deficient perineal body cannot retain a ring pessary. Gellhorn pessaries are stiffer with a central stem; typically removed and re-evaluated by the clinician every 2 to 3 months.
- Fitting Procedure: Select the largest size pessary that comfortably relieves prolapse symptoms without causing discomfort. Confirm proper fit by having the patient walk, bend, cough, and void in the clinic without expulsion.
- Topical Vaginal Estrogen Therapy: In postmenopausal women with hypoestrogenic vaginal mucosal atrophy, co-prescribing topical vaginal estrogen cream (17β-estradiol 0.01% cream 0.5 to 1 g, or estradiol 10 mcg vaginal tablets) 2 to 3 times weekly restores vaginal epithelial glycogenation, thickens the mucosa, enhances submucosal vascularity, and prevents or treats mucosal ulcerations caused by pessary friction.
Urinary Incontinence: Differential Diagnosis & Evidence-Based Interventions
Urinary incontinence—the involuntary loss of urine—afflicts over 50% of adult women. Accurate clinical classification into stress, urgency, mixed, or overflow subtypes dictates appropriate management.
| Assessment Parameter | Stress Urinary Incontinence (SUI) | Urgency Urinary Incontinence (UUI / OAB) | Overflow Incontinence |
|---|---|---|---|
| Underlying Etiology | Urethral Hypermobility (loss of pubocervical fascial support) OR Intrinsic Sphincter Deficiency | Detrusor Muscle Overactivity (involuntary, uninhibited detrusor contractions during bladder filling) | Impaired Detrusor Contractility (neurogenic) OR Bladder Outlet Obstruction (severe POP) |
| Triggering Events | Involuntary loss synchronous with coughing, sneezing, laughing, lifting, or exercising | Involuntary loss preceded by a sudden, compelling, uncontrollable urge to void | Constant involuntary dribbling, hesitancy, weak stream, sense of incomplete emptying |
| Volume of Leakage | Small spurts or drops coincident with physical exertion | Moderate to large volume; complete bladder emptying | Continuous small-volume dribbling |
| Nocturia & Frequency | Typically absent or minimal | Daytime frequency (>8 voids/day) and Nocturia (≥2 voids/night) | Frequent small voids, nocturnal enuresis |
| Post-Void Residual (PVR) | Normal (<50 mL) | Normal (<50 mL) | Markedly Elevated (>200 to 300 mL) |
| First-Line Midwifery Management | Pelvic floor muscle training (Kegel exercises), continence pessary (ring with knob) | Behavioral therapy (timed voiding, bladder retraining, eliminate caffeine/irritants) | Decompress bladder via clean intermittent self-catheterization (CIC); treat obstruction |
| Second-Line Pharmacotherapy | None approved (Surgical gold standard: Midurethral synthetic sling) | Antimuscarinics (Oxybutynin) OR Beta-3 Agonists (Mirabegron, Vibegron) | Treat cause. Anticholinergics are STRICTLY CONTRAINDICATED (worsen retention). |
Pharmacologic Nuances in Urgency Incontinence
- Antimuscarinic / Anticholinergic Agents (Oxybutynin, Tolterodine, Solifenacin): Block postganglionic muscarinic (M2 and M3) receptors on detrusor smooth muscle, inhibiting uninhibited contractions. Significant systemic anticholinergic adverse effects: dry mouth (xerostomia), severe constipation, blurred vision, tachycardia, and risk of cognitive impairment/dementia in elderly patients. Contraindicated in uncontrolled narrow-angle glaucoma and gastric retention.
- Beta-3 Adrenergic Receptor Agonists (Mirabegron, Vibegron): Stimulate beta-3 adrenergic receptors in the detrusor, promoting detrusor smooth muscle relaxation during the bladder filling phase, increasing bladder storage capacity. Free of anticholinergic side effects; does not cause dry mouth, constipation, or cognitive deficits. Clinical Precaution: Can cause dose-dependent elevations in blood pressure; contraindicated in severe, uncontrolled hypertension (SBP ≥180 or DBP ≥110 mmHg).
Test Your Knowledge
A 58-year-old G4P4 postmenopausal woman presents complaining of a sensation of vaginal fullness and a visible bulge at the introitus that worsens toward the end of the day. She also reports progressive difficulty with bowel movements over the past year, noting that she frequently has to insert her thumb or fingers into her vagina and press backward against the posterior vaginal wall to evacuate stool completely. Which pelvic floor defect is causing this patient's symptoms, and what is the definitive physical finding associated with this clinical history?
A
B
C
D