Objective      To explore the application of bladder and urethra synchronous manometry (BUSM) in the assessment of female stress urinary incontinence (SUI).       Methods      Thirty-five women (49.5±8.6 years old) diagnosed with SUI were included in the SUI group

and thirty-four women without voiding dysfunction (48.4±10.3 years old) were selected as the control group (NSUI group). BUSM was carried out in all women according to the standards proposed by the International Continence Society. The observation parameters included filling urethral closure pressure (UCPfill)

average urethral closure pressure (UCP) in valsaval maneuver

pressure transmission ratio (PRT)

and voiding urethral closure pressure (UCPvoid).       Results      During the filling process

the static urethral pressure was higher than bladder pressure in the SUI and NSUI groups

and there was no change in UCPfill at the beginning and at last (P0.05)

however

the UCPfill of the SUI group was obviously lower than that of the NSUI group (P0.05). When the patients did valsaval maneuver

the UCP was negative and PTR was 100% or less in the SUI group

while the UCP remained positive and PRT was greater than 100% in the NSUI group

and the UCP and PTR between the SUI and NSUI groups had statistical significance (P0.05). In the voiding phase

the bladder pressure increased while urethral pressure decreased

and the maximal urethral closure pressure was negative

but there was no difference in UCPvoid between the SUI and NSUI groups (P0.05).       Conclusion      BUSM is an effective measurement to assess the coordination function of the bladder and urethra. The lower UCPfill

PRT≤100% and negative UCP can provide valuable references for diagnosis of SUI.