The Influence of Using Vascularized Vaginal Flap on the Efficacy of Mesh-augmented Sacrospinous Hysteropexy

BACKGROUND POP is an epidemiologically widespread condition, occurring in 40-60% of women who have given birth. With all the variety of anatomical defects of the pelvic floor, the most common variant is prolapse of the anterior vaginal wall (cystocele).

Of the currently known surgical methods for the treatment of cystocele, anterior colporrhaphy occupies one of the most key places. However, the high recurrence rate of 7-23%, and according to some authors more than 90%, has led to the development of new techniques. In 1997, M. Cosson proposed the "Plastron" method, the essence of which is to close the defect of the pubocervical fascia by fixing a de-epithelialized flap of the anterior vaginal wall to the tendinous arch of the pelvic fascia and then performing anterior colporrhaphy over it. The method was effective in 93.5% of cases in patients with cystocele. At the same time, apical prolapse is present in many women with cystocele. Apical support is important in maintaining normal pelvic floor anatomy. Patients who undergo anterior vaginal wall repair with concomitant repair of the apical defect have a lower risk of reoperation for POP.

There are various methods for restoring apical defects while preserving the uterus. SSHP is the most studied method and was originally performed using sutures. The use of transvaginal mesh for SSHP remains controversial due to the high risk of mesh-associated complications, although many authors report the safety and high effectiveness of the SSHP method using transvaginal mesh. Despite this, the issue of cystocele recurrence after SSHP (with or without mesh) in combination with anterior colporrhaphy remains unresolved.

PREOPERATIVE ASSESSMENT All patients who meet eligibility criteria will undergo a preoperative assessment: medical history, physical and vaginal examination, assessing pelvic organ prolapse according to Pelvic Organ Prolapse Quantification System (POP-Q). All patients will complete questionnaires validated in Russia: Pelvic Floor Disability Index (PFDI-20), Pelvic Organ Prolapse/Urinary Incontinence Sexual Questionnaire, short form (PISQ-SF), Patient Global Impression of Improvement (PGI-I).

MATERIALS AND METHODS The investigators hypothesis is that is that the use of a deepithelialized vascularized flap of the anterior vaginal wall when performing mesh-augmented sacrospinous hysteropexy and anterior subfascial colporrhaphy reduces the risks of developing relapses of POP in the anterior compartment.

The sample size was calculated taking into account the reported rate of cystocele recurrence using each technique in the literature (6.5% for sacrospinous hysteropexy using vaginal flap vs. 38.7% for mesh-augmented sacrospinous hysteropexy using subfascial colporrhaphy). With a power of 80%, a level of 0,05 and the non-inferiority margin at 15%, the sample size is 50 patients. The investigators assume a drop-out rate of 20%, thus a total of 60 participants will be included in the study.

All enrolled patients will be randomly assigned to SSHP using mesh, vaginal flap and anterior colporrhaphy or SSHP using mesh and anterior colporrhaphy treatment groups in equal ratio the day before the surgery, using computer randomization.

All data will be collected by medical staff not involved in treatment. Collected pre- and postoperative data will be anonymized using unique codes, that patients will receive immediately after randomization.

All surgical interventions will be performed by 3 qualified surgeons. Postoperative follow-up will be performed 6 and 12 months after surgery by 2 researchers, who will be blinded about the type of intervention.