Urodynamic studies in boys with disorders of the lower urinary tract. II. Stenosis of the external urethral meatus. A pre- and postoperative study.

Nineteen boys with stenosis of the external urethral meatus underwent urodynamic investigation. The intravesical pressure pre-operatively was essentially normal in all but two patients. The urinary flow preoperatively was characterized by slow initiation, plateauformation in the flow curve and, in all but two patients, a decreased maximum flow. The urethral resistance was increased in all patients. The maximum exit velocity of the urinary stream was generally increased and the urethral energy losses essentially within normal limits. Urodynamic investigation proved to be of value in respect of diagnosis and follow-up. The outflow situation was satisfactorily improved in most patients after treatment, but in one third there was little or no change for the better.