[The mechanism of action of the alpha-adrenoblocker prazosin on bladder function in patients with benign prostatic hyperplasia].

Prazosin treatment effects were evaluated in two groups of patients with benign prostatic hyperplasia (BPH). 10 patients of group 1 have previously undergone epicystostomy for acute urine retention. They received prazosin for 7 days 5 mg/day. 9 patients of group 2 had no direct indications for adenomectomy and therefore received conservative treatment: one or two 3-week prazosin courses (5 mg/day). All the patients were examined before and after prazosin treatment. As shown by routine methods of investigation and rheocervicocystography, alpha-adrenoblockers, prazosin in particular, promote positive changes in cervical circulation of the bladder. This reduces detrusor hypoxia leading to bioenergetic normalization in the smooth muscles. Clinically, the response manifests in improved reservoir function of the bladder (increased effective volume, lowered pollakiuria). It is concluded that prazosin and other alpha-adrenoblockers are highly effective drugs in conservative treatment of BPH.