Videourodynamic study will be performed with the patient in supine position if patients cannot stand up or sit on the commode. A 6 Fr dual channel urethral pressure profiles (UPP) urethral catheter will be inserted to the urinary bladder. After evacuation of the residual urine, urethral pressure profilometry will be performed first. Then the bladder will be filled with normal saline containing 20% urografin at the filling rate of 30 ml/min. The filling and voiding cystourethrography will be investigated by a C-arm positioned below the patient. Uroflowmetry is recorded by a weighed transducer placed below the examination table. After the bladder is filled to the capacity, the patients are asked to urinate per urethrae. If patient cannot urinate per urethrae with the urethral catheter in situ, suprapubic puncture with a 18 Gauge needle and a 3-Fr epidural catheter will be undertaken and patients will urinate without the catheter in the urethra. The patients are requested to stand up and urinate into the commode. Pressure flow study and concomitant voiding cystourethrography are performed.