In acute urinary retention required emergency assistance – evacuation bladder by catheterization. To this end, the ambulance surgeon makes catheterization of the bladder rubber catheter. Pre-enter, antispasmodic drugs (1 ml 2% solution of papaverine hydrochloride, 1 ml of 0.2% solution platifillina subcutaneously). Used for this purpose a metal catheter is not recommended - you can damage the urethra. After emptying the bladder was washed with an antiseptic solution (0.02% solution Frc). If self-catheterization after urination is not restored, the patient to be hospitalized to clarify and eliminate the cause of urinary retention.