Voiding disturbances following anal surgery.

Voiding disturbances following anal surgery are a well known but often ignored condition. Thirty-seven patients were investigated before and after operation for hemorrhoids by uroflowmetry and measurement of residual urine. Sixteen patients showed a decreased peak flow after operation, 13 patients had residual urine of more than 100 ml and 5 patients developed urinary retention. Five of the 13 patients complained of stranguria, incontinence, nocturia and frequency during the following months. We suggest that patients with urological problems after anal surgery should have their bladder controlled at regular intervals.