Urinary Retention & Incontinence

A post-op patient hasn't voided in 8 hours and says they don't feel the urge — but their bladder holds 900 mL. Knowing the difference between retention and incontinence changes every intervention you choose.

Urinary retention is the inability to empty the bladder completely. Acute retention presents as sudden inability to void with suprapubic distension, discomfort, and a palpable or scan-confirmed bladder volume exceeding 300–400 mL. Chronic retention may be painless with frequent small voids and a persistently elevated post-void residual (PVR) above 200 mL. Common causes include anesthesia, opioids, anticholinergics, neurogenic bladder, and obstruction. Incontinence is the involuntary loss of urine and has distinct types: stress (leakage with coughing, sneezing, or lifting due to weak pelvic floor muscles), urge (sudden overwhelming need to void — overactive detrusor), overflow (constant dribbling from an overdistended bladder — actually a sign of retention), and functional (intact urinary tract but cognitive or mobility barriers prevent reaching the toilet). Assessment priorities include a bladder scan before catheterization, voiding diary, PVR measurement, and medication review. Non-invasive interventions come first: timed voiding schedules, double voiding, Credé maneuver (gentle suprapubic pressure — used selectively; contraindicated in neurogenic bladder due to reflux risk), pelvic floor exercises (Kegels) for stress incontinence, and limiting bladder irritants like caffeine. Catheterization is the sibling atom's territory — your job is recognizing when it's needed by identifying retention that doesn't resolve with conservative measures.

Key Distinctions

Overflow incontinence looks like incontinence but the underlying problem is retention — the bladder never empties, it just overflows. Don't confuse stress incontinence (activity-related leakage, weak sphincter) with urge incontinence (detrusor overactivity, sudden uncontrollable urge). Students assume all post-op urinary problems require catheterization; a bladder scan showing less than 300 mL means the patient needs more time and non-invasive strategies, not a catheter.

Clinical Pearl

Dribbling isn't always incontinence — if the bladder is full on scan and the patient dribbles, it's overflow from retention. Scan first, label second.