Abstract
The preoperative urodynamic evaluations of twenty patients with myelomeningocele who had had artificial sphincter implantation because of urinary incontinence were reviewed. Four patients developed hydronephrosis and severe impairment of renal function between two and six years after implantation of the artificial sphincter. The condition was partly reversible after removal of the artificial sphincter. The urodynamic evaluation prior to implantation revealed in the four mentioned patients compared to the 16 patients with normal upper urinary tract, a tendency to lower bladder compliance, lower bladder capacity and more severe detrusor hyperreflexia, but it was not possible to make a clear discrimination between the two groups. Attention is drawn to this unfortunate combination of effects after artificial sphincter implantation. Periodic control of the upper urinary tract by urography is recommended.
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