Medical expulsive therapy for distal ureteral stones has had a difficult evidence history, with large trials casting doubt on alpha-blocker monotherapy. This prospective randomised trial at a single centre in Ardabil enrolled 120 patients with distal ureteral stones of 4-10 mm, randomising them to tamsulosin 0.4 mg daily or tamsulosin plus tolterodine 2 mg twice daily, for up to four weeks.
Stone expulsion occurred in 83.3% of the combination group against 66.7% on tamsulosin alone (p = 0.03), and mean expulsion time was shorter at 10.5 days against 14.8 (p < 0.001). Patients on combination therapy reported lower pain scores and needed less rescue analgesia. Adverse effects were comparable, with dry mouth slightly more common with tolterodine.
The rationale is plausible — antimuscarinic relaxation of the distal ureter and bladder trigone alongside alpha-blockade — and the effect sizes are large. But this is 120 patients at one centre, unblinded as far as reported, and the expulsion rate on tamsulosin alone at 66.7% is higher than several larger trials have found, which suggests a population or an assessment method that favours expulsion generally. Worth knowing and worth testing further; not yet worth changing a protocol for.
- Expulsion 83.3% with combination vs 66.7% with tamsulosin alone
- Expulsion time 10.5 vs 14.8 days; less pain and less rescue analgesia
- Adverse effects comparable; slightly more dry mouth with tolterodine
- Single centre, 120 patients — promising rather than practice-changing
The statistics, in plain English
A p-value of 0.03 for the expulsion difference in 120 patients means the result is statistically significant but not robust: with 60 per arm, a handful of patients moving between categories would remove it. The expulsion-time difference, at p < 0.001, is firmer. Note that medical expulsive therapy is an area where small single-centre trials have repeatedly reported large benefits that larger multicentre trials then failed to reproduce.
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