What is storage LUTS and voiding LUTS and double micturition symptoms come under which category
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Here is a clear breakdown of LUTS classification with double micturition placed correctly:
Classification of LUTS (Lower Urinary Tract Symptoms)
LUTS are classified based on the phase of the micturition cycle in which they occur - into 3 categories as defined by the International Continence Society:
1. Storage LUTS
(Failure of bladder to act as a functioning reservoir - typical of overactive bladder)
- Frequency (voiding too often during the day)
- Nocturia (waking at night to void)
- Urgency (sudden compelling desire to void, difficult to defer)
- Urge incontinence
- Stress incontinence
- Nocturnal enuresis
2. Voiding LUTS
(Typical of bladder outlet obstruction or underactive bladder)
- Hesitancy (difficulty initiating micturition)
- Reduced/slow urinary stream
- Intermittency (flow stops and starts)
- Straining to void
- Terminal dribble
- Splitting of stream
3. Post-micturition LUTS
(Symptoms occurring after voiding is complete)
- Feeling of incomplete emptying - sensation that bladder fullness persists after voiding
- Post-micturition dribble - involuntary urine loss immediately after finishing voiding
- Double micturition - the need to void again shortly after voiding, due to residual urine in the bladder or urethra being expelled
Where does Double Micturition fit?
Double micturition is a post-micturition symptom. The patient voids, feels they have finished, but within a few minutes needs to void again (or dribbles out residual urine). It is classically associated with:
- Urethral diverticulum (in women) - urine pools in the diverticulum and leaks out after voiding
- Vesicoureteric reflux - urine refluxed into ureters returns to the bladder after voiding
- Bladder outflow obstruction with significant post-void residual
The clinical instruction for patients with urethral diverticulum/reflux is to void, wait a minute, then void again to empty the residual - hence the term "double micturition."
Summary Table
| Category | Examples |
|---|---|
| Storage | Frequency, nocturia, urgency, urge/stress incontinence |
| Voiding | Hesitancy, poor stream, intermittency, straining, terminal dribble |
| Post-micturition | Incomplete emptying, post-void dribble, double micturition |
- Bailey and Love's Short Practice of Surgery 28th Edition, p. 1469-1470
What is the management of post micturition syndrome does mirabegron helps
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mirabegron post-micturition LUTS treatment
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mirabegron overactive bladder efficacy
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management post micturition syndrome post void dribble treatment mirabegron
Here is a complete breakdown of the management of post-micturition LUTS and the specific role of mirabegron:
Management of Post-Micturition LUTS
Post-micturition LUTS has two main symptoms:
- Feeling of incomplete emptying - sensation of residual urine after voiding
- Post-micturition dribble (post-void dribble) - involuntary urine loss immediately after finishing voiding
These are managed according to their underlying cause.
1. Conservative / Behavioral Measures
These are first-line for post-void dribble:
- Urethral milking (bulbar urethral massage): In men, after voiding, the patient applies gentle upward pressure from the perineum (bulbar urethra) toward the penile tip to expel residual urine pooled in the bulbar urethra. This is highly effective for post-micturition dribble.
- Double micturition technique: Void, wait 1-2 minutes, then attempt to void again. Particularly useful in patients with vesicoureteric reflux or urethral diverticulum.
- Pelvic floor muscle exercises (Kegel exercises): Strengthen the pelvic floor and urethral sphincter to improve urethral clearance after voiding. Recommended as first-line for post-void dribble in both men and women.
- Bladder retraining and timed voiding in patients with incomplete emptying.
2. Pharmacological Management
Treatment targets the underlying cause of the incomplete emptying or post-void dribble:
| Cause | Drug |
|---|---|
| Bladder outflow obstruction (BPH) | Alpha-blockers (tamsulosin, alfuzosin, silodosin) - relax smooth muscle of bladder neck and prostate |
| BPH with large prostate | 5-alpha reductase inhibitors (finasteride, dutasteride) - reduce prostate size |
| Underactive detrusor | Bethanechol (muscarinic agonist) - increases detrusor contractility |
| Neurogenic bladder with retention | Intermittent self-catheterization |
| Coexisting overactive bladder (mixed LUTS) | Antimuscarinics or mirabegron |
Does Mirabegron Help Post-Micturition LUTS?
Mirabegron has a limited and indirect role here. Here is why:
Mechanism: Mirabegron is a beta-3 adrenoceptor agonist. It stimulates beta-3 receptors in the detrusor muscle fundus, causing relaxation via increased intracellular cyclic AMP - this promotes bladder filling (storage phase relaxation), not voiding. - Campbell Walsh Wein Urology, p. 383
Primary indication: Mirabegron is FDA-approved for storage LUTS - specifically urgency, frequency, and urgency incontinence (overactive bladder). It significantly reduces micturition frequency and incontinence episodes compared to placebo. Evidence from the SCORPIO, ARIES, and CAPRICORN phase III trials confirms this.
In post-micturition LUTS specifically:
- Mirabegron does NOT address incomplete emptying or post-void dribble directly.
- However, in patients with mixed LUTS (both storage and post-micturition symptoms, commonly seen in BPH), mirabegron may be used as part of combination therapy alongside an alpha-blocker.
- The combination of mirabegron + solifenacin (SYMPHONY trial) showed improved voided volume and reduced frequency, but this targets the storage component, not the post-micturition component.
Caution: Because mirabegron relaxes the detrusor, theoretically it could worsen incomplete emptying in patients with already impaired detrusor contractility or outlet obstruction by reducing the force of bladder contraction. Post-void residual should be monitored if used in such patients.
3. Surgical / Procedural Management
For post-micturition symptoms caused by structural obstruction:
- TURP / laser prostatectomy - for BOO due to BPH
- Urethral dilatation or urethrotomy - for urethral stricture
- Excision of urethral diverticulum - in women, where pooled urine in the diverticulum causes post-void dribble
- Intermittent clean self-catheterization (CISC) - for chronic urinary retention with large post-void residual
Summary
| Treatment | Target |
|---|---|
| Urethral milking / pelvic floor exercises | Post-void dribble (1st line) |
| Alpha-blockers (tamsulosin) | Incomplete emptying due to BOO |
| 5-ARI (finasteride) | BPH-related incomplete emptying |
| CISC | Large post-void residual / retention |
| Surgery | Structural causes (stricture, diverticulum, BPH) |
| Mirabegron | Storage LUTS / mixed LUTS - NOT directly for post-micturition symptoms |
Bottom line: Mirabegron is not a treatment for post-micturition syndrome. It treats the storage phase (overactive bladder). Using it for post-micturition symptoms alone is not indicated and may worsen incomplete emptying. It may be appropriate only when storage LUTS coexist, ideally combined with an alpha-blocker under monitoring.
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