Abstract: Objective To investigate the videourodynamic study(VUDS) characteristics of various complex lower urinary tract voiding dysfunction and the diagnostic value of videourodynamic examination.Methods From May 2009 to June 2012,78 patients with complex lower urinary tract voiding dysfunction were included in our study.There were 38 males and 40 females,aged 19-75(mean,47) years.All patients had chief complaints of various lower urinary tract symptoms(LUTS),accompanying anatomical abnormalities or other chronic nervous system diseases history,or had a history of failed surgery planning for further surgery treatments.All patients underwent thorough VUDS(uroflowmetry,cystometrogram,pressure-flow study and urethral pressure profile).Results 4 males were removed who couldn’t be intubated the bladder pressure catheter.The remaining 74 cases underwent complete VUDS.8 cases were neurogenic bladder,including DU (3 cases),DO (2 cases),bladder low compliance with uronephrosis(2 cases) and DESD (1 cases).59 cases were non-neurogenic voding dysfunction,including BOO (29 cases),DU (13cases,with 5 female patients who couldn’t void voluntarily in PFS),DO (3 cases),real urinary incontinence(4 cases),stress urinary incontinence after prostatectomy(10 cases).BOO were classified into BPO (3 cases),POP (5 case),bladder neck obstruction (13 cases),posterior urethral obstruction (3 cases) and dysfunctional voiding(5 cases).7 cases were diagnosed normal in VUDS.8 cases changed their previous clinic diagnosis after VUDS.Conclusion Videourodynamic examination provides precise evidence of diagnosis for complex lower urinary tract voiding dysfunction.It can evaluate anatomic abnormalities sites and the function of detrusor/urethral sphincter.It also provides preliminary classification of lower urinary tract diseases and reliable references for the following treatments.

Key words: Videourodynamics, Voiding dysfunction, Lower urinary tract sympatoms, Lower urinary tract obstruction, Urinary incontinence