- Design
- Systematic review and meta-analysis of 8 randomised controlled trials
- Population
- Men with acute urinary retention due to benign prostatic hyperplasia
- Primary outcome
- Successful trial without catheter
- Effect
- Risk difference +24.5% (95% CI 18.4 to 30.7) vs placebo
A meta-analysis of eight randomised trials compared alpha-blockers with placebo in men with acute urinary retention due to benign prostatic hyperplasia, before a trial without catheter.
Alpha-blockers increased the chance of voiding successfully by an absolute 24.5 percentage points — roughly one extra successful trial for every four men treated. The authors report a possible reduction in recurrent retention and no significant increase in adverse effects.
This confirms what many urologists already do but is not yet universal, particularly in emergency departments and general wards where catheters are placed. Starting the alpha-blocker at catheterisation, rather than waiting for the urology review, gives it time to work before the trial without catheter, usually a few days later. Watch for postural hypotension in older men.
- Start an alpha-blocker such as tamsulosin or alfuzosin when catheterising a man for BPH-related retention.
- Plan a trial without catheter after a few days of treatment rather than immediately.
- Warn about dizziness on standing, especially in older men and those on antihypertensives.
- Continue the alpha-blocker after a successful trial and arrange urology follow-up.
- Ask about planned cataract surgery; alpha-blockers can cause floppy iris syndrome.
Why it matters
A simple prescription at the first contact roughly prevents one failed trial without catheter for every four men treated.
The statistics, in plain English
A risk difference of 24.5% (95% CI 18.4 to 30.7) is an absolute gain, so the number needed to treat for one extra success is about 4. The pooled trials varied in drug, dose and timing.
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