Parent & Patient Information System 06/09/2015 Page26 / 51 Before the test, genitalia is cleaned with a special solution. Then, a special catheter which has 2 lumens (one lumen for serum physiologic instillation, one lumen for pressure measurement) is inserted to the bladder, another catheter is inserted to rectum to measure the abdominal pressure and finally 3 electrodes are stuck to the perineal area to measure the sphincteric activity. By these catheters and electrodes, the behavior of bladder and urethral sphincter during filling and emptying are investigated. During the test, child will be asked several questions to understand the different filling phases: first sensation (the first sensation that the child feels bladder is being filled), first desire to void (the first point that the child can void but can postpone this feeling) and strong desire to void (continuous feeling of voiding without the fear of urine leakage). If a contrast material is put into the instilled liquid, it will be able to visualize the bladder under fluoroscopy during the test. This is called ‘videourodynamic study’. The fluoroscopic images and pressure studies are recorded simultaneously. It helps to investigate the relation between bladder and sphincter in details, the presence of VUR, the pressure during the initiation of VUR and anatomic abnormalities in the bladder.
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