[Urodynamics of urethral valve resection]

Basing on the cases of 8 children with urethral valves who were diagnosed and treated during the first year of life we report on the urodynamic results. It is concluded that after valve resection enhanced pressure levels may still exist during micturition for some time even if the flow of urine has become normal. A morphologically and functionally satisfactory treatment result (separate lasix clearance on both sides) can be expected only after the pressure has dropped, a phenomenon that often occurs spontaneously.