Combined stress urinary incontinence surgery at the time of prolapse surgery--is it justified?
Patients regard the development or persistence of SUI after prolapse surgery as failed surgery. The estimated risk of SUI after prolapse surgery varies between 11% (1) and 22%. (2) In the past, some advocated routine prophylactic SUI surgery at the time of prolapse surgery; however, the risks of this prophylactic surgery should also be brought into the equation. These risks include irritative symptoms, voiding disorders, and injuries to the urinary tract, bowel, nerves and vascular structures.
At present there are three options for the treatment of occult SUI: (i) empiric combined prolapse and SUI surgery; (ii) a selective policy with the demonstration of hidden SUI pre-operatively; and (iii) a two-step approach.
It must be kept in mind that certain prolapse procedures, such as sacrospinous ligament fixation and colpocleisis, have a particularly high risk of postoperative occult SUI.
Diagnosis of occult SUI
Patients with a history of previous SUI, which has improved with progressive prolapse, are at increased risk of developing de novo SUI. Despite its limitations, clinical examination is currently still the best method of diagnosing occult SUI. The prolapsed organ is reduced and the patient is observed for urinary leakage on exertion. This is the so-called 'stress test'. It is important to perform this reduction test at a bladder volume of about 300 ml. Reduction can be performed by manual reduction or with a pessary, Sims speculum, cotton swab, vaginal packing or ring forceps. Each of these methods has a different detection rate. Visco et al. showed in a prospective randomised trial that a large cotton swab had the best detection rate for occult SUI. (3) There is, however, still no standardised method of reduction for stress testing. The result of a reduction stress test is also not always comparable to the anatomical result achieved with surgery. The sensitivity of the stress test has been shown to range between 5% and 38% and the specificity between 74% and 96%. (3)
Other tests, including urodynamic parameters, the Q-tip test and the urethrocystogram, have not been shown to be good detectors of occult SUI. The value of urodynamics remains controversial. The CARE study showed that urodynamic testing was not useful in predicting postoperative SUI. (2)
In our unit, however, we routinely perform pre-operative urodynamics. We find it useful in diagnosing patients with overactive bladder, voiding disorders and significant residuals and those with occult SUI. We are of the opinion that it is helpful in counselling patients and that it may have value in avoiding litigation.
Pelvic floor ultrasound has recently come to the fore. (4) Bladder neck hypermobility has been shown to correlate with SUI, but specific reference values have not yet been agreed upon. Funnelling of the internal urethral meatus appears to be to nonspecific. Colour Doppler can be used to identify leakage of small amounts of urine on valsalva. We could not find any literature evaluating the role of pelvic floor ultrasound after reduction of prolapse. The predictive value of pelvic floor ultrasound in the management of patients with occult SUI still needs to be clarified.
SUI prevention at the time of abdominal prolapse surgery
Only two randomised controlled trials address this issue (Table I). The CARE study (5) was a multicentre study involving 157 patients randomised to a prophylactic Burch colposuspension at sacrocolpopexy, with 165 women serving as controls. In the intervention group, 23.8% developed SUI, compared with 44.1% of the control group. The authors concluded that an additional Burch colposuspension at the time of abdominal sacrocolpopexy significantly reduced the risk of SUI.
In contrast, a smaller study, by Constantini et al. (6) had contradictory results. In this monocentric study, 34 patients underwent a prophylactic Burch colposuspension and 32 in the control group only had a sacrocolpopexy. They limited their study to a select group of patients who had a negative stress test before and after reduction, no leakage on urodynamic testing and no symptoms of urinary incontinence. Surprisingly, 26.4% in the intervention group developed SUI, compared with 3.1% in the control group.
When reading the CARE study in another way, 56% of the patients who were continent pre-operatively were still dry postoperatively in the no-intervention arm, and 24% of the pre-operatively continent patients in the Burch group became incontinent postoperatively. (7)
In the current literature, there were no randomised controlled trials evaluating the role of suburethral slings at the time of abdominal prolapse surgery. Slings may be a more reproducible anti-incontinence procedure and may give us clearer results. We propose that a future randomised controlled trial should be considered in order to clarify this issue.
SUI surgery at the time of vaginal prolapse surgery
There are currently no randomised controlled studies that have evaluated the role of SUI surgery at the time of vaginal prolapse surgery. The role of prophylactic suburethral sling procedures at the time of vaginal prolapse surgery is therefore still an important unanswered question. A prospective study by Hiltunen et al. (8) has shown that there is an increased association between anterior mesh repairs and SUI.
Intra-operative evaluation for occult SUI
The intra-operative cough test has not been widely adopted. It needs the co-operation of the patient and regional anaesthesia. The sensitivity of this test is controversial.
The intra-operative use of pelvic floor ultrasound has also not yet been assessed in the literature. Potential roles of this investigation include evaluation of bladder neck hypermobility after prolapse surgery, evaluation of the degree of bladder neck evaluation after Burch colposuspension to predict a voiding disorder, and evaluation of suburethral tape placement.
Which anti-incontinence procedure?
The Burch colposuspension is being superseded by the non-tension vaginal polypropylene suburethral sling procedure (TVT). The suburethral sling offers the advantages of a minimally invasive procedure with relatively low morbidity. It is also important to keep in mind that when sacrocolpopexy is combined with a colposuspension, vault and posterior vaginal wall prolapse are more likely to occur. (7)
Patients should be properly informed before prolapse surgery. They should also be informed regarding the risk of de novo SUI, as well as the complications of a prophylactic SUI procedure. It should also be kept in mind that up 20% of patients are still incontinent, to some degree, after a prophylactic colposuspension. This figure decreases to 10% in the case of a TVT procedure. (9)
At this stage of the controversy, it is acceptable to do an additional anti-incontinence procedure at the time of pelvic organ prolapse surgery in patients who are incontinent or have a positive stress test. In continent patients with a negative stress test, the debate is still open. The risk-benefit ratio must be rigorously estimated in these patients.
We feel that overall the literature does not support empiric combined prolapse and SUI surgery. This approach may, in fact, result in unnecessary complications.
We consider that further research is needed in the following areas: standardisation of the stress test, the role of suburethral slings to prevent de novo SUI, and pelvic floor ultrasound in prolapse surgery.
(1.) Stanton SL, Hilton P, Norton C, Cardozo L. Clinical and urodynamic effects of anterior colporrhaphy and vaginal hysterectomy for prolapse with and without incontinence. Br J Obstet Gynaecol 1982; 89: 459-463.
(2.) Borstad E, Rud T. The risk of developing urinary stress-incontinence after vaginal repair in continent women. A clinical and urodynamic follow-up study. Acta Obstet Gynecol Scand 1989; 68: 545-549.
(3.) Visco AG, Brubaker L, Nygaard I, et al. The role of preoperative urodynamic testing stress-continent women undergoing sacrocolpopexy and urinary reduction efforts (CARE) randomized surgical trial. Int Urogynecol J Pelvic Floor Dysfunct 2008; 19: 607-614.
(4.) Dietz PD, Hoyte LPJ, Steensma AB. Atlas of Pelvic Floor Ultrasound. 1st ed. London: Springer, 2008: 41-50.
(5.) Brubaker L, Cundiff GW, Fine P, et al. Abdominal sacrocolpopexy with Burch colposuspension to reduce urinary stress incontinence. N Engl J Med 2006; 354: 1557-1566.
(6.) Costantini E, Zucchi A, Giannantoni A, Mearini L, Bini V, Porena M. Must colposuspension be associated with sacropexy to prevent postoperative urinary incontinence? Eur Urol 2007; 51: 788-794.
(7.) Fatton B. Is there any evidence to advocate SUI prevention in continent women udergoing prolapse repair? An overview. Int Urogynecol J Pelvic Floor Dysfunct 2009; 20: 235-245.
(8.) Hiltunen R, Nieminen K, Takala T, et al. Low-weight polypropylene mesh for anterior vaginal wall prolapse: a randomized controlled trial. Obstet Gynecol 2007; 110: 455-462.
(9.) Cardozo L, Staskin D, eds. Textbook of Female Urology and Urogynecology. Informa Healthcare, 2006: 355-376, 922.
L Juul, MB ChB, MMed (O&G), FCOG (SA)
J A van Rensburg, MB ChB, MMed (O&G), FCOG (SA)
Urogynaecology Unit, Tygerberg Hospital and Stellenbosch University, Tygerb erg, W Cape
Table I. Randomised controlled trials addressing SUI prevention at the time of prolapse surgery (adapted from Fatton (7)) Anti- Patient Author, year Study level incontinence characteristics and surgery of evidence procedure (N) Brubaker et Multicentric Burch group Subjective SUI al., 2006, prospective N=157 19.7% (30) (6) ASCP randomised, Positive stress level 1 test without reduction 2% (3), with POP reduction 35.7% (55) Detrusor overactivity 12.1% (19) Control group Subjective SUI N=165 18.8% (30) Positive stress test without reduction 5.7% (9), with POP reduction 35.8% (58) Detrusor overactivity 10.4% (17) Constantini Monocentric Burch group Negative stress et al.,2007, prospective N=34 test before and (6) ACSP randomised, after reduction level 2 No symptoms of UI (history, questionnaire) No leakage during UDS Control group N=32 Comments Author, year Follow- Postoperative and other and surgery up SUI (N) results (N) Brubaker et 3 mo. Global 23.8% (35) Urge al., 2006, (and 1 yr) According to outcome (6) ASCP symptoms 19% 32.7% (50) (29) Serious According to adverse stress testing events 14.6% 7% (7) (23) (After 1 yr 25%) 3 mo. Global 44.1% (67) Urge (and 1 yr) According to outcome symptoms 39.7% 38.4% (58) (60) Serious According to adverse stress testing events 14.5% 8.6% (14) (24) (After 1 yr 40.1%) Constantini 42 (SD De novo SUI et al.,2007, 18) mo. 26.4% (6) ACSP (range 12 - 74) 38 (SD De novo SUI 3.1% 19) mo. (range 15 - 71) ASCP = open abdominal sacrocolpopexy; SUI = stress urinary incontinence; POP = pelvic organ prolapse; UI = urinary incontinence; UDS = urodynamic studies; SD = standard deviation.
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|Author:||Juul, L.; van Rensburg, J.A.|
|Publication:||South African Journal of Obstetrics and Gynaecology|
|Article Type:||Clinical report|
|Date:||Oct 1, 2009|
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