Pre-operative urodynamic studies : is there value in predicting post-operative stress urinary incontinence in women undergoing prolapse surgery

[摘要] ENGLISH ABSTRACT: Aims of the studyUrodynamic studies (UDS) have been suggested to be performed as part of the pre-operative work-up of patients undergoing prolapse surgery. Some women with POP have occult stress urinary incontinence (OSUI) and even if subjectively continent, have a higher incidence of developing de novo stress urinary incontinence (SUI). The aim of this study was to describe the outcome of a group of patients who had pre-operative UDS and manual prolapse reduction.MethodsThis was a retrospective descriptive study including all women who had prolapse surgery during the period January 2006 to December 2011. Patients received routine pre-operative UDS and manual reduction of prolapse, performed at maximum bladder capacity determined by UDS. Patients demonstrating urodynamic SUI or OSUI were offered a concomitant anti-incontinence procedure. Post-operative follow-up data included symptoms of SUI and clinical evidence of SUI.ResultsThe final group consisted of 131 women. The mean age of the patients was 57 years (range 33 to 79) and parity 3.6 (range 0 to 7). The mean body mass index was 32 (range 19 to 53). Twenty-four (18.3%) women had demonstrable SUI on clinical examination at initial presentation in the clinic. At the time of urodynamic studies, forty patients (30.5%) had evidence of SUI determined by either UDS and/ or cough test in the standing position at maximum bladder capacity. Ninety-one women (69.5%) had no evidence of UI on UDS, of which 20(15.3%) demonstrated OSUI (SUI on manual reduction of prolapse at maximal bladder capacity determined by UDS). Of the 40 women with UI on UDS, 36 had 1-step surgery (combination of anti-incontinence procedure and prolapse repair) and 4 had prolapse surgery alone. Of the 20 women with OSUI on UDS, 16 had 1-step (combined) surgery and 4 prolapse surgeries only. Of the 4 who had prolapse surgery alone, 3 complained of post-operative SUI. In the group with no SUI on UDS and manual reduction of POP, 69 of the 71 women had follow-up data. Only 1 had demonstrable SUI on examination. The manual reduction test had a sensitivity of 42.9% and a specificity of 98.5% (95% CI, 92.0-99.9%). The positive predictive value was 75.0% (95% CI, 19.4-99.3%), with a high negative predictive value of 94.4% (95% CI, 86.2-98.8%).ConclusionThe numbers in our study are too small to determine sensitivity and positive predictive value of UDS and manual prolapse reduction for the detection of OSUI. However, our data shows promise in identifying POP patients without OSUI, which is a complement of the hypothesis. We recommend that UDS can be performed pre-operatively in women undergoing prolapse surgery, to identify patients with urodynamic stress incontinence. Manual reduction of the prolapse at maximum bladder capacity can then be done to identify a subgroup of patients without OSUI. Future research is needed on the true predictive value of reduction stress testing with larger numbers.

[发布机构] Stellenbosch University