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Int Neurourol J > Volume 21(1); 2017 > Article
Sung, Ko, Suh, Ryu, and Lee: Surgical Outcomes and Safety of Robotic Sacrocolpopexy in Women With Apical Pelvic Organ Prolapse

ABSTRACT

Purpose

This study aimed to investigate the surgical outcomes and safety of robotic sacrocolpopexy (RSC) in patients with uterine/vaginal vault prolapse.

Methods

Between January 2009 and June 2015, 16 women with apical prolapse underwent RSC. Pelvic organ prolapse quantification (POP-Q) examination was performed, and treatment success was defined as the presence of grade 0 or I apical prolapse upon POP-Q examination at the final follow-up. Pelvic floor distress inventory-short form 20 (PFDI-SF 20) was administered at every follow-up. A treatment satisfaction questionnaire was administered by telephone to evaluate patient satisfaction with the operation.

Results

Median age was 65 years (interquartile range [IQR], 56–68 years), and follow-up duration was 25.3 months (IQR, 5.4–34.0 months). Thirteen women (81.3%) had ≥grade III apical prolapse. Operation time was 251 minutes (IQR, 236–288 minutes), and blood loss was 75 mL (IQR, 50–150 mL). Median hospital stay was 4 days (IQR, 3–5 days). At the final follow-up, treatment success was reported in all patients, who presented grade 0 (n=8, 57.1%) and grade I (n=6, 42.9%) apical prolapse. Dramatic improvements in PFDI-SF 20 scores were noted after RSC (from 39 to 4; P=0.001). Most patients (12 of 13) were satisfied with RSC. An intraoperative complication (sacral venous plexus injury) was reported in 1 patient, and there was no conversion to open surgery. Mesh erosion was not reported.

Conclusions

RSC is an efficient and safe surgical option for apical prolapse repair. Most patients were satisfied with RSC. Thus, RSC might be one of the best treatment options for apical prolapse in women.

INTRODUCTION

Pelvic organ prolapse (POP) is a common, troublesome, and costly problem in women. In the United States (US), the cumulative incidence of POP surgery was reported to be 12.6%, and the age-specific annual risk of POP was found to increase progressively until the seventh decade of life when the annual risk is 4.3 per 1,000 women [1]. Routine pelvic examinations have shown that the prevalence of any degree of POP increases up to one-third in women aged 20–59 years, because mild prolapse is common and frequently asymptomatic [2,3]. In addition, one study reported that the estimated number of women with POP will increase from 3.3 million in 2010 to 4.9 million in 2050 in the US [4]. The total annual cost of POP surgery in the US is estimated to be over US $1 billion [5]. Indirect costs related to time off from work and loss of wages and the negative impact on the quality of life in patients should also be considered [6].
Abdominal sacrocolpopexy (ASC) was introduced in 1962 [7] and has been the gold standard of treatment for uterine/vaginal vault prolapse (apical prolapse) for over 50 years [8,9]. However, this approach has some shortcomings related to the use of laparotomy, such as a high morbidity rate and long hospital stay. On the other hand, laparoscopic sacrocolpopexy (LSC) has been reported to have some advantages over ASC, including minimal invasiveness, reduced blood loss, reduced postoperative pain, shorter duration of recovery, and earlier return to normal activity [10-12]. However, laparoscopic surgery is technically challenging and can present a steep learning curve for surgeons. In addition, postural ergonomic strain during LSC is bothersome to surgeons [13].
Robotic sacrocolpopexy (RSC) was first described by Di Marco et al. [14] in 2004. Since its introduction, RSC has proven to be a reliable, efficient, and safe surgical option for uterine/vaginal vault prolapse repair [15-17]. RSC has the advantages of being minimally invasive and having a shorter learning curve than LSC. However, data on the surgical technique and measures of success are not consistent [16]. Although a few studies on sacrocolpopexy have been performed in Korea, data on RSC in Korean patients have not been reported to date [18,19]. Therefore, the aim of this study was to introduce RSC at one institution and to examine the surgical outcomes and safety of RSC in patients with apical prolapse.

MATERIALS AND METHODS

Patients

Between January 2009 and June 2015, 16 women with symptomatic stage II or greater uterine/vaginal vault prolapse underwent RSC at a tertiary hospital. Data on patient age, body mass index (BMI), operation history, American Society of Anesthesiologists (ASA) physical status classification, estimated blood loss, operation time, length of hospital stay, surgical outcomes, and perioperative complications were retrospectively obtained from patient medical records and telephone surveys. In all patients receiving uterus-preserving RSC, gynecologic evaluation was done preoperatively.

Surgical Technique

The surgical technique performed at the institution has been described briefly in a previous study [20]. Patients were placed in a dorsal lithotomy and steep Trendelenburg position (30°). A Foley catheter was placed, pneumoperitoneum was created, and 5 laparoscopic ports were placed to form a “W” shape (one 12-mm trocar for the camera port above the umbilicus, three 8-mm trocars for the robotic arms, and one 12-mm trocar for the assistant). A 0° or 30° lens was used interchangeably. A vaginal retractor was used to push up the vaginal wall anteriorly, and then, the peritoneum of the uterovesical junction was dissected. A peritoneal dissection between the posterior uterus and vagina was performed to carry out peritoneal tunneling at the lateral level of the broad ligament opening. A peritoneal incision was made over the sacral promontory at the bifurcation of the aorta, and sacral dissection was performed until the anterior longitudinal ligament was exposed. An anterior mesh (4 × 5-cm nonabsorbable polypropylene monofilament mesh; Gynemesh, Gynecare, Ethicon Inc., Somerville, NJ, USA) was placed and sutured with nonabsorbable sutures (Ethibond, Ethicon Inc.). The anterior mesh was not used in the case of a small-sized uterus. A T-shaped mesh was placed on the posterior dissection plane, and both arms of the mesh were drawn through the peritoneal tunnel of the broad ligament. The anterior and posterior meshes were sutured together on the anterior side of the uterus. In the case of vaginal vault prolapse, peritoneal dissection of the proximal vagina was performed, and then a Y-shaped mesh was placed. The tail of the T- or Y-shaped mesh was fixed with the anterior longitudinal ligament on the sacral promontory. Next, vaginal examination was performed to assess the apical support of the vagina. The peritoneum was then reapproximated over the mesh with absorbable sutures [20]. Transobturator midurethral sling surgery was performed after RSC in patients with stress incontinence triggered by heaving, climbing, or patient preference (n=8, 50.0%). Staging of stress incontinence was evaluated after reduction of apical prolapse. In case of the presence of central-type cystocele, transvaginal cystocele repair was performed using a transobturator four-arm mesh (n=1, 6.3%). Vaginal packing was placed and then removed on postoperative day 1.

Follow-Up

Patients were routinely discharged on postoperative days 2–5. The patients visited the outpatient clinic at 1, 3, 6, and 12 months after the procedure and then at least once a year. The POP quantification (POP-Q) examination was performed pre-and postoperatively and at every follow-up. The pelvic floor distress inventory-short form 20 (PFDI-SF 20) was administered preoperatively and at every follow-up. The PFDI-SF 20 is a disease-specific questionnaire that evaluates the symptoms of pelvic floor disorders and has been validated and translated into Korean [21]. This questionnaire included 4 subscales: total score inventory, POP distress inventory, colorectal-anal distress inventory, and urinary distress inventory. A five-tier treatment satisfaction questionnaire (TSQ) was administered by telephone to evaluate patient satisfaction with the operation.

Data Analysis

The primary endpoint of the present study was to evaluate the surgical outcome of RSC. Treatment success was defined as the presence of grade 0 or I apical prolapse on the POP-Q examination at the final follow-up. To measure the subjective outcomes, the preoperative and postoperative PFDI-SF 20 scores were compared. The secondary endpoint was to assess the surgical safety of this technique and evaluate patient satisfaction with the operation. Operation time from skin incision to closure, estimated blood loss, intraoperative complications, incidence of open conversion, and length of hospital stay were evaluated. Postoperative complications were graded using the Clavien-Dindo classification system.

Statistical Analysis

Data are presented as counts and percentages. Continuous variables are expressed as median and interquartile range (IQR). Data were statistically analyzed using the Wilcoxon signed-rank nonparametric test for matched pairs. A 2-sided P-value of <0.05 was considered statistically significant. All statistical analyses were performed using IBM SPSS Statistics Version 22.0 (IBM Co., Armonk, NY, USA).

RESULTS

The median age was 65 years (IQR, 56–68 years), and median follow-up duration was 25.3 months (5.4–34.0 years). The median ASA physical status classification grade was 2 (1–3), and BMI was 25.4 kg/m2 (24.0–28.3 kg/m2). A history of abdominal surgery was reported in 6 patients (37.5%), including hysterectomy (n=5, 31.3%). Two patients (12.5%) had previously undergone cystocele repair and midurethral sling surgery at the same time. Thirteen patients (81.3%) had ≥grade III apical prolapse. Stress incontinence was reported in 11 patients (68.8%; Table 1).
Perioperative outcomes are shown in Table 2. Operation duration was 251 minutes (IQR, 236–288 minutes), and blood loss was estimated to be 75 mL (IQR, 50–150 mL). The median hospital stay was 4 days (IQR, 3–5 days). At the last follow-up, 14 patients underwent POP-Q examination. Treatment success was reported in all patients who presented grade 0 (n =8, 57.1%) and grade I (n=6, 42.9%) apical prolapse. As shown in Table 3, improvements in apical prolapse were assessed by POP-Q examination (preoperative C point, 4 [2–5]; postoperative C point, -6 [-8 to -5]; P=0.001). There were statistically significant improvements in anterior and posterior wall prolapse as well as apical prolapse (all P-values<0.05). No recurrences occurred during follow-up.
Only 14 women completed the PFDI-SF 20 before the operation and at the final follow-up (Fig. 1). Dramatic improvements in all subscales of the PFDI-SF 20, including the total score, POP distress, colorectal-anal distress, and urinary distress inventories, were noted after the operation (all P-values=0.001). Results of the TSQ showed that 12 of 13 patients (92.3%) were “very satisfied” (n=6, 46.1%) or “satisfied” (n=6, 46.1%) with RSC. However, 1 patient reported that she was “very dissatisfied” with the treatment, although she had grade I apical prolapse at the final follow-up. She had presented with central-type cystocele, which persisted even after the surgery.
An intraoperative complication (i.e., sacral venous plexus injury resulting in massive bleeding and transfusion) was reported in 1 patient who was among the first to undergo RSC. However, there was no case of conversion to open surgery. Postoperative complications were reported in 4 patients but were transient in all patients (Table 4). Bowel injury, ureteral injury, and mesh erosion were not reported in any patients. Of the 5 patients who did not experience stress incontinence before the surgery, 2 reported de novo stress incontinence.

DISCUSSION

The present study demonstrated that RSC is an effective, reliable, and safe method for apical prolapse repair. At the last follow-up, successful outcome measures based on POP-Q scores were reported in all patients. In addition, most patients (12 of 13) were satisfied with the operation. Only 1 woman who was dissatisfied with the operation presented with persistent central-type cystocele and underwent cystocele repair approximately 2 years after RSC. Using the validated PFDI-SF 20, the subjective outcomes of RSC were assessed. Improvements in all subscales of the PFDI-SF 20 were confirmed at the last follow-up visit. An intraoperative complication (i.e., sacral venous plexus injury) was reported in only 1 patient who was among the first to undergo RSC. Thereafter, peritoneal dissection to expose the anterior longitudinal ligament on the sacral promontory was performed with the aid of an assistant. By using palpation and devices facilitating tactile sensation, surgeons determined the appropriate sites for dissection and mesh fixation. During the immediate postoperative period of 90 days, no major complications (Clavien-Dindo classification grade III or greater) were reported. To our knowledge, this is the first study to evaluate the surgical outcomes and safety of RSC in Korea.
Since the introduction of RSC, several studies including randomized trials and meta-analyses have reported data on the reliability, efficacy, and safety of this technique over the past decade [16,17,22]. The European Association of Urology stated that the surgical outcomes of RSC were favorable, and therefore, this procedure was given a grade A recommendation [23]. Midterm follow-up data in the present study also confirmed the results of previous analyses on the surgical outcomes and safety of this technique. With confirmation of the efficacy and safety of RSC and the rising popularity of robotic surgery, use of this technique for apical prolapse repair might increase in the future. Extrapolating from the experience of robotic surgery in prostate cancer, it is reasonable to assume that RSC may be widely used in the near future.
There has been increasingly widespread use of synthetic mesh in the management of POP, although data on synthetic mesh use are controversial. Recently, the Food and Drug Administration highlighted the complications associated with the transvaginal placement of synthetic mesh for POP treatment [24]. Vaginal shortening, tightening, and pain induced by mesh use and mesh erosion were cited as previously unidentified risks. The use of mesh during transvaginal POP repair may introduce risks that are not present in traditional nonmesh surgery. The prostheses/graft complication classification system proposed by the joint meeting of the International Continence Society/International Urogynecological Association can be used to report and accurately characterize mesh complications [25]. Mesh placed abdominally for POP repair may lead to lower rates of mesh-related complications than transvaginal prolapse repair with mesh [8]. In the present study with a medium duration of follow-up, there were no mesh-related complications such as vaginal pain and contraction and mesh erosion. Abdominal placement of mesh for apical prolapse repair seems to be safe in the current study, although further studies with longer follow-up periods are warranted to confirm this finding. Moreover, before the operation, surgeons should clearly explain the postoperative risks and complications associated with mesh use to the patients.
In the current study, 8 women underwent midurethral sling surgery at the time of RSC, and 2 of 5 patients with negative preoperative prolapse reduction stress testing (PRST) had de novo stress incontinence. De novo stress incontinence after sacrocolpopexy remains controversial, although recent studies have reported an overall de novo stress incontinence rate of about 15%–30% in patients with negative PRST [26,27]. As the degree of POP increases, stress incontinence is more likely to be “masked” by kinking of the urethra. Anterior vaginal tensioning intended to reduce bladder prolapse during sacrocolpopexy can result in the flattening of the urethrovesical angle and lead to new-onset stress incontinence [26]. Patients with a high Aa point reduction magnitude were at the highest risk of stress incontinence [26]. On the other hand, the role of the posterior vaginal wall in the development of de novo stress incontinence needs to be clarified. De novo stress incontinence could be a disappointing outcome after RSC in previously continent women. Thus, thorough PRST is needed to identify those patients who may benefit from incontinence surgery at the time of RSC. However, stress incontinence may still occur after RSC even in patients with negative PRST.
Currently, there are 3 methods for the surgical management of the uterus: sacrohysteropexy (uterine preservation), supracervical hysterectomy with sacrocolpopexy, and total hysterectomy with sacrocolpopexy. Of these, concomitant total hysterectomy with sacrocolpopexy should be avoided because it is associated with a relatively high rate of mesh erosion [28]. In our institution, sacrohysteropexy for uterine preservation and sacrocolpopexy are performed in women who had undergone previous hysterectomy. In women considering uterine preservation, careful patient selection is critical. Sufficient counseling with respect to the risks of uterine malignancies or other pathologies associated with uterine sparing should be offered before surgery [29,30]. Gutman and Maher [28] presented a list of contraindications to uterine-preserving prolapse surgery. Women who experience specific symptoms and have a history of conditions such as uterine abnormalities, postmenopausal bleeding, and abnormal menstrual bleeding should be referred for gynecologic evaluation and excluded from the uterine-preserving protocol.
Limitations of the current study include its retrospective nature. Some main outcomes including POP-Q measure and PFDI survey may have been missed even in the small series. Moreover, the small sample size limited the statistical power for comparison and outcome evaluation. Furthermore, the relatively short-term follow-up may have been inadequate to evaluate the rates of recurrence and complications such as mesh erosion, which usually occurs after a considerable period of time.
In conclusion, the present study demonstrated that RSC is an efficient and reliable technique for uterine/vaginal vault prolapse repair in women. RSC is associated with few intra- and postoperative complications and may be comparable in surgical safety to ASC or LSC according to midterm follow-up data. In addition, most patients were satisfied with the surgical outcomes of RSC. Thus, RSC might be one of the best surgical options for apical prolapse repair in women.

NOTES

Grant/Fund Support
This research was supported by a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (grant number: HI14C3229).
Research Ethics
This study was performed with the approval of the Institutional Review Board of Samsung Medical Center at Sungkyunkwan University School of Medicine (approval number: 2016-03-163).
Conflict of Interest
No potential conflict of interest relevant to this article was reported.

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Fig. 1.
Measurement of patient-reported outcomes for robotic sacrocolpopexy by using pelvic floor distress inventory-short form 20.
inj-1732642-321f1.tif
Table 1.
Baseline characteristics (n=16)
Variable Value
Age (yr) 65 (56–68)
Body mass index (kg/m2) 25.4 (24.0–28.3)
Follow-up duration (mo) 25.3 (5.4–34.0)
ASA PS classification, grade II (I–III)
Previous abdominal surgery 6 (37.5)
 Hysterectomy 5 (31.3)
 Salpingo-oophorectomy 1 (6.3)
Previous POP repair 2 (12.5)
Stress incontinence 11 (68.8)
 Grade I 7 (43.8)
 Grade II 4 (25.0)
Previous anti-incontinence surgery 2 (12.5)
Uterine/vaginal vault prolapse
 Grade II 3 (18.8)
 Grade III 10 (62.5)
 Grade IV 3 (18.8)

Values are presented as median (interquartile range) or number (%).

ASA PS, American Society of Anesthesiologists physical status; POP, pelvic organ prolapse.

Table 2.
Surgical outcomes of robotic sacrocolpopexy (n=16)
Variable Value
Operation time (min) 251 (236–288)
Estimated blood loss (mL) 75 (50–150)
Combined operation 9 (56.3)
 Midurethral sling 8 (50.0)
 Cystocele repair 1 (6.3)
Conversion to open surgery 0 (0)
Hospital stay (day) 4 (3–5)
Uterine/vaginal vault prolapse
 Grade 0 8
 Grade I 6
Success at last follow-up 14 (100)a)
Recurrence at last follow-up 0 (0)

Values are presented as median (interquartile range) or number (%).

a) Only 14 women were measured by the questionnaire before the operation and at the final follow-up.

Table 3.
Measurement of pelvic organ prolapse by using pelvic organ prolapse quantification examination (n=14)
Point Preoperative Postoperative P-valuea)
Aa point 3 (1–3) -2 (-2 to 0) 0.002
Ba point 3 (3–5) -2 (-2 to -1) 0.001
C point 4 (2–5) -6 (-8 to -5) 0.001
Ap point -2 (-2 to 3) -2 (-3 to -2) 0.016
Bp point 2 (-2 to 3) -2 (-3 to -2) 0.002
gh 5 (4–6) - -
pb 3 (2–4) - -
tvl 8 (7–9) - -

Aa, point A anterior; Ap, point A posterior; Ba, point B anterior; Bb, point B posterior; C, cervix or vaginal cuff; gh, genital hiatus; pb, perineal body; tvl, total vaginal length.

a) Wilcoxon signed-rank test.

Table 4.
Detailed description of perioperative complications
Complication No. (%) Detail
Intraoperative complication 1 (6.3) Sacral venous plexus injury causing massive bleeding
Postoperative complicationa)
 Grade I 3 (18.8) Headache (n=1), nausea (n=1), transient nerve palsy (n=1)
 Grade II 1 (6.3) Postoperative transfusion (n=1)

a) Using Clavien-Dindo complication classification.

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Surgical Management of Pelvic Organ Prolapse2013 March;17(1)



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