Clinical trial NCT02578056: Advanced Genital Prolapse Surgery With and Without Mid Urethral Sling to Prevent Stress Urinary Incontinence
Official title: Advanced Genital Prolapse Surgery With and Without Mid Urethral Sling to Prevent Stress Urinary Incontinence. A Multicenter, Randomized, Double-blind, Controlled Study
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Pelvic Organ Prolapse
Urinary Stress Incontinence
Keywords: pelvic organ prolapse
urinary incontinence
Lead sponsor: University of Sao Paulo General Hospital
Sponsor class: OTHER
First posted: 2015-10-16
Enrollment: 374
Sex: FEMALE
Minimum age (years): 18
Maximum age (years): 100
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: Pelvic organ prolapse (POP) is a public health problem worldwide, affecting about 30 %. It implies physical, psychological and social losses. A frequent complication after surgeries for POP is developing de novo stress urinary incontinence (SUI). SUI and POP have similar pathophysiology and therefore it is common to coexist in the same patient. De novo SUI has a prevalence 11-44 % after surgical correction of genital prolapse. Occult urinary incontinence (OUI) is considered the major risk factor for postoperative SUI. Studies on this topic show conflicting results. In a recent meta-analysis on this subject, Maher et al concluded that the value of performing any anti- incontinence procedure in continent women undergoing prolapse surgery remains unknown.

The aims of this study are to evaluate whether the association of a transvaginal tape (TVT®) in continent patients undergoing surgery for prolapse decreases the risk of de novo SUI and if it implies an improvement in their quality of life. The secondary endpoints are to assess the complications associated with this procedure, as irritative symptoms and voiding dysfunction postoperatively and assessing the ability of stress testing with reduced POP and urodynamics in predicting the risk of de novo SUI. This study will be a prospective, multicentric, randomized experimental study.

Patients with anterior or apical prolapse stages 3 and 4 (POP - Q) will be invited to participate in the study. The study will assess these patients for staging of prolapse, the presence of occult urinary incontinence and quality of life. Selected patients will be randomized to perform correction of genital prolapse and prophylactic anti-incontinence procedure or correction of genital prolapse only. Patients will be assessed 3, 6 and 12 months after surgery. Postoperative evaluation will be similar to preoperative. The exclusion criteria are: complaint or diagnosis of stress urinary incontinence before reduction of the prolapse, previous surgery for incontinence or pelvic organ prolapse, hypocontractility detrusor in urodynamics and inability to understand and give informed consent.

Detailed description: The sample size calculation was based on a study with similar design. It was estimated that 312 patients would be sufficient to demonstrate a 15% difference between groups in a sample with 80% power and a significance level of 95 %. Considering a 20% margin of loss throughout the study we came to the final sample of 374 patients.

Preoperative evaluation: Genital prolapse will be staged according to the system of quantification of pelvic organ prolapse (ICS Pelvic Organ Quantification Prolapse - POP - Q ). All patients will be initially analyzed for quantitative urinalysis and urine culture prior to testing to IUO. In case of urinary infection, the patient will be subjected to antibiotics and reassessed after a negative urine culture. To perform the effort test, during the physical examination, the patient's bladder will be emptied with a urinary catheter and soon after instilled with 300ml of saline solution. By this time the stress test (Valsalva maneuver and cough) will be held before and after prolapse reduction. The test will be performed with the patient in supine and prone positions. The prolapse reduction will be performed using gauzes on a DeLee forceps. The urodynamics consists of three stages: initial uroflowmetry, cystometry and voiding study. The stress test will be performed during cystometry in the cystometric capacity of 300ml, with and without prolapse reduction. The reduction will be carried out on the same fashion as stress test. Schafer nomogram will be used for the diagnosis of detrusor hypocontractility and the Blaivas - Groutz nomogram for the diagnosis of obstruction. The presence of urinary incontinence after prolapse reduction in the clinical stress test or urodynamics configure the diagnosis of occult stress urinary incontinence.

The patients will be submitted for assessment of quality of life through the following questionnaires : Quality of Life Questionnaire Prolapse and Incontinence Quality of Life Questionnaire ( I-QOL ).

The surgical repair will be conducted on this way: Surgical correction of genital prolapse will be taken vaginally. The prolapse of the anterior vaginal wall will be treated with site-specific correction of pubocervical fascia . The correction of apical prolapse will be performed with the use of High McCall culdoplasty technique. In uterine prolapse, associated vaginal hysterectomy will be performed.

The posterior vaginal wall prolapse will be treated with site-specific correction of rectovaginal fascia.If present, the perineal tear will be corrected.

Patients randomized to anti-incontinence surgery will undergo TVT as standard technique. Patients randomized to pelvic organ prolapse surgery alone will undergo two small incisions of 0.5 cm in the suprapubic region in a similar way to that used for the insertion of the sling (sham incisions). These incisions intended to keep the raters blind to the achievement or otherwise of the sling during the postoperative evaluation.

Randomization will be held by a computer-generated random numbers software. The result of randomization will be revealed in the operating room after the patient is anesthetized, ie, the patient will be blinded for carrying or not a sling. The surgeon will be blinded to the results of preoperative IUO evaluation and results of quality of life questionnaires. Patients and researchers who will carry out the postoperative evaluations will be blinded to treatment.

Statistical Evaluation Continuous variables will be presented as mean and standard deviation and compared using the two-tailed Student t test for two samples. Categorical variables will be presented as frequencies and percentages and compared between groups by the Fisher exact test, p \< 0.05 will be considered statistically significant. These evaluations will be performed using a SPSS software.

Eligibility criteria: Inclusion Criteria:

* genital prolapse POP-Q stages 3 or 4
* surgical treatment planning.

Exclusion Criteria:

* signals or symphtoms of stress urinary incontinence before prolapse reduction
* previous surgery for stress urinary incontinence
* previous surgery for genital prolapse
* inability to understand and give informed consent

Primary outcomes:
measure: Incidence of de novo stress urinary incontinence
timeFrame: 3, 6 and 12 months postoperatively
Secondary outcomes:
measure: Complications related to the surgical procedure (s)
timeFrame: 7 days postoperatively
measure: Incidence of overactive bladder and urinary obstruction symptoms
timeFrame: 3, 6 and 12 months postoperatively
measure: Positive predictive value of urodynamics and Standadized Effort Test to detect patients who will became incontinence after surgery.
timeFrame: 3, 6 and 12 months postoperatively
measure: Negative predictive value of urodynamics and Standadized Effort Test to detect patients who will remain continents after surgery.
timeFrame: 3, 6 and 12 months
measure: Impact of urinary incontinence on patient´s quality of life
timeFrame: 3, 6 and 12 months
measure: Impact of prolapse on patient´s quality of life
timeFrame: 12 months
measure: need for surgery or any treatment for urinary incontinence postoperatively
timeFrame: 12 months
measure: Eficaccy of surgery to treat and relief prolapse symptoms
timeFrame: 12 months
Other outcomes:
Locations:
city: Sao Paulo
country: Brazil
facility: University of sao Paulo General Hospital
Study officials:
affiliation: University of Sao Paulo Medical School
name: Luciana p gomes, MD
role: PRINCIPAL_INVESTIGATOR
References:
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citation: Olsen AL, Smith VJ, Bergstrom JO, Colling JC, Clark AL. Epidemiology of surgically managed pelvic organ prolapse and urinary incontinence. Obstet Gynecol. 1997 Apr;89(4):501-6. doi: 10.1016/S0029-7844(97)00058-6.
citation: Malak M. The role of anti-incontinence surgery in management of occult urinary stress incontinence. Int Urogynecol J. 2012 Jul;23(7):823-5. doi: 10.1007/s00192-011-1563-4. Epub 2011 Sep 17.
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citation: Maher CM, Feiner B, Baessler K, Glazener CM. Surgical management of pelvic organ prolapse in women: the updated summary version Cochrane review. Int Urogynecol J. 2011 Nov;22(11):1445-57. doi: 10.1007/s00192-011-1542-9. Epub 2011 Sep 17.
citation: 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 Jun;89(6):459-63. doi: 10.1111/j.1471-0528.1982.tb03637.x.
citation: Schierlitz L, Dwyer PL, Rosamilia A, De Souza A, Murray C, Thomas E, Hiscock R, Achtari C. Pelvic organ prolapse surgery with and without tension-free vaginal tape in women with occult or asymptomatic urodynamic stress incontinence: a randomised controlled trial. Int Urogynecol J. 2014 Jan;25(1):33-40. doi: 10.1007/s00192-013-2150-7. Epub 2013 Jun 28.
citation: Souza CC, Rodrigues AM, Ferreira CE, Fonseca ES, di Bella ZI, Girao MJ, Sartori MG, Castro RA. Portuguese validation of the Urinary Incontinence-Specific Quality-of-Life Instrument: I-QOL. Int Urogynecol J Pelvic Floor Dysfunct. 2009 Oct;20(10):1183-9. doi: 10.1007/s00192-009-0916-8. Epub 2009 Jun 9.
citation: de Oliveira MS, Tamanini JT, de Aguiar Cavalcanti G. Validation of the Prolapse Quality-of-Life Questionnaire (P-QoL) in Portuguese version in Brazilian women. Int Urogynecol J Pelvic Floor Dysfunct. 2009 Oct;20(10):1191-202. doi: 10.1007/s00192-009-0934-6. Epub 2009 Jul 4.