Induction of a different immune response in non-titanized compared to titanized polypropylene meshes

It is well known that pelvic organ prolapse (POP) significantly reduces the quality of life of affected women and in many cases requires corrective surgery. Aim of the study was to compare the immune response against titanized versus non-titanized meshes, especially macrophage polarization and immune checkpoint association. For this, we analyzed 644 POP surgeries, which were performed between 2017 and 2022, in our department. Four of them needed revision surgery caused by erosion. We analyzed the influx of CD68 & CD163 positive macrophages and the expression of immune checkpoint molecules PD-L1 and PD1 in these 4 patients. We identified a large number of CD68 and CD163 positive macrophages and additionally a PD-L1 expression of these cells. Based on the in-vivo results, we isolated monocytes and co-cultivated monocytes with different mesh material covered with or without fibroblasts. We identified a significantly enhanced macrophage activation and PD-L1 expression in macrophages surrounding non-titanized polypropylene mesh material. Encapsulation of the material by fibroblasts was crucial for that. Specifically, CD68-positive macrophages are upregulated (p < 0.001), co-expressing PD-L1 (p < 0.001) in monocytes co-cultivated with non-titanized polypropylene meshes. Monocytes co-cultivated with titanized polypropylene meshes showed significantly lower expression of CD163 (p = 0.027) and PD-L1 (p = 0.022). In conclusion, our in vitro data suggest that the titanium coating leads to a decreased polarization of macrophages and to a decreased immune response compared to non-titanized meshes. This could be an indication for the increased incidence of erosion of the non-titanized meshes, which is a severe complication of this procedure and requires revision surgery. STATEMENT OF SIGNIFICANCE: Pelvic organ prolapse is a well-known problem for women and often requires corrective surgery. Polypropylene meshes are often used, which differ in their coating (titanized vs. non-titanized). A severe side effect of these surgeries is mesh erosion, due to onset of inflammation, which requires revision surgery. We examined all erosion cases (4 of 644 patients) with implanted nontitanium-coated meshes by immunohistochemistry and found upregulation of macrophage polarization (as markers CD68 and CD163) and increased expression of the immune checkpoint molecules PD-L1 and PD1. This suggests inflammatory processes and an enhanced immune response. In addition, we set up an in vitro experiment to investigate whether coating plays a role. Here, we demonstrated that the non-titanized meshes elicited a significantly higher immune response in comparison to titanized meshes, which could lead to the higher erosion rate of the non-titanized meshes. Our results highlight the benefit of titanized meshes, which should lead to a lower revision surgery rate and thus improved patient outcome.

Measurement of extraction forces of non-absorbable suture and different anchoring systems used for pelvic organ prolapse surgery using soft-embalmed cadavers: A feasibility study

OBJECTIVE

Success of pelvic organ prolapse (POP) mesh procedures also depends on reliable anchoring systems (AS). Our primary aim was to assess the use of soft-embalmed cadavers in testing of different AS and our secondary aim was to compare extraction forces (EF) of different AS and non-absorbable suture (NAS).

STUDY DESIGN

IRB approval was obtained. NAS (Ti-cron®) and different AS were attached to force-measuring instrument (Dynamometer SS25LA) and anchored to anterior longitudinal (ALL) and pectineal ligament (PL) (Protack®, Uplift®, NAS), and sacrospinous ligament (SSL) (Surelift®, Elevate PC®, NAS) of Thiel soft-embalmed cadavers. EF were measured 2-4 times in each cadaver. Data were compared using non-parametric tests. Statistical significance was set at p < 0.05.

RESULTS

Three female cadavers (age 59, 77 and 87) were used. NAS EF were significantly higher than AS EF for ALL and SSL, but not PL. Thiel soft-embalmed cadavers proved to be useful in testing of different AS.

CONCLUSIONS

Use of soft-embalmed cadavers in testing of different AS is feasible. According to our results, the NAS provides most reliable intra-corporeal fixation. However, significant inter- and intra-subject variability indicates that results may also be dependent on the tissue properties and anchoring procedure. Further testing using soft-embalmed cadavers could help optimise mesh procedures and establish a threshold EF necessary for reliable fixation.

Anatomical outcomes 1 year after pelvic organ prolapse surgery in patients with and without a uterus at a high risk of recurrence: a randomised controlled trial comparing laparoscopic sacrocolpopexy/cervicopexy and anterior vaginal mesh

INTRODUCTION AND HYPOTHESIS

Few studies have compared the different approaches of mesh surgery in patients with severe pelvic organ prolapse (POP). In addition to laparoscopic sacrocolpopexy/cervicopexy (LSC-Cx), anterior vaginal mesh (AVM) may be an effective approach for correcting anterior vaginal wall associated with apical POP in women with advanced POP.

METHODS

A randomised controlled trial (RCT; January 2011 to March 2016) including 120 patients (60/group) with advanced symptomatic POP, with a predominant anterior vaginal wall descent stage III or greater in combination with a stage II or III apical defect (uterus or vaginal vault). Patients underwent four visits: baseline, 3, 6 and12 months after surgery. The main outcome was anatomical success defined as anterior and posterior vaginal wall not descending beyond the hymen and vaginal apex descent no more than one third into the vagina. Secondary variables: PFDI, ICIQ-UI-SF, intraoperative variables, postoperative morbidity and complications.

RESULTS

Anatomical success was achieved with LSC-Cx in 79% and with AVM in 76% (NS). No statistically significant differences were found among POP-Q anterior vaginal wall points between groups, whereas better results were obtained with LSC-Cx in posterior vaginal wall points and total vaginal length. Intraoperative outcomes were similar in the two groups, except for operating time (78.05 min LSC-Cx vs 44.28 min AVM). There were no statistically significant differences related to de novo stress urinary incontinence and dyspareunia. Worse results were found in the CRADI-8 in the LSC-Cx group, owing to constipation. Late postoperative complications and reinterventions were similar in the two groups.

CONCLUSIONS

No differences were found in the anatomical correction of anterior and apical POP. The LSC-Cx group presented better correction of posterior vaginal wall defects and a longer total vaginal length.

Patient satisfaction after laparoscopic lateral suspension with mesh for pelvic organ prolapse: outcome report of a continuous series of 417 patients

INTRODUCTION AND HYPOTHESIS

Sacropexy is considered the gold standard for the treatment of pelvic organ prolapse (POP) although dissection of the promontory may be challenging, particularly in obese women. Laparoscopic lateral suspension with mesh (LLS) could be an alternative.

METHODS

LLS provides lateral attachment by fibrosis of a vesicovaginal mesh. Clinical evaluation was performed at 1 year using the simplified POP quantification system (POP-Q). Primary outcomes were objective and subjective cure at 1 year. After a mean of 7.2 years the rates of reoperation and complications were assessed as secondary outcomes. Patient satisfaction was evaluated by telephone interview using a ten-point-scale and the PGI-I scale. Factors predicting satisfaction were determined by logistic regression analysis.

RESULTS

A total of 417 patients were treated between 2003 and 2011. At 1 year 78.4% of patients were asymptomatic and anatomic success rates were 91.6% for the anterior compartment, 93.6% for the apical compartment and 85.3% for the posterior compartment. The complication rate of Clavien-Dindo grade III or higher was 2.2%. The mesh exposure rate was 4.3% and the reoperation rate was 7.3%. Of the 417 patients, 214 participated in the telephone interview. Over 85% rated their situation as improved and satisfaction was associated with the absence of concomitant hysterectomy.

CONCLUSIONS

LLS is a safe technique with promising results in terms of a composite outcome, low complication rates and high long-term patient satisfaction. However, a randomized controlled trial is needed to establish the technique as an alternative to sacropexy in the treatment of POP in obese and high morbidity patients.

Patient satisfaction after laparoscopic lateral suspension with mesh for pelvic organ prolapse: outcome report of a continuous series of 417 patients

INTRODUCTION AND HYPOTHESIS

Sacropexy is considered the gold standard for the treatment of pelvic organ prolapse (POP) although dissection of the promontory may be challenging, particularly in obese women. Laparoscopic lateral suspension with mesh (LLS) could be an alternative.

METHODS

LLS provides lateral attachment by fibrosis of a vesicovaginal mesh. Clinical evaluation was performed at 1 year using the simplified POP quantification system (POP-Q). Primary outcomes were objective and subjective cure at 1 year. After a mean of 7.2 years the rates of reoperation and complications were assessed as secondary outcomes. Patient satisfaction was evaluated by telephone interview using a ten-point-scale and the PGI-I scale. Factors predicting satisfaction were determined by logistic regression analysis.

RESULTS

A total of 417 patients were treated between 2003 and 2011. At 1 year 78.4% of patients were asymptomatic and anatomic success rates were 91.6% for the anterior compartment, 93.6% for the apical compartment and 85.3% for the posterior compartment. The complication rate of Clavien-Dindo grade III or higher was 2.2%. The mesh exposure rate was 4.3% and the reoperation rate was 7.3%. Of the 417 patients, 214 participated in the telephone interview. Over 85% rated their situation as improved and satisfaction was associated with the absence of concomitant hysterectomy.

CONCLUSIONS

LLS is a safe technique with promising results in terms of a composite outcome, low complication rates and high long-term patient satisfaction. However, a randomized controlled trial is needed to establish the technique as an alternative to sacropexy in the treatment of POP in obese and high morbidity patients.

Prosthetic surgery versus native tissue repair of cystocele: literature review

Cystocele is the most common pelvic organ prolapse. It is defined as the descent of the bladder into the anterior vaginal wall. Aging is significantly associated with the prevalence and severity of pelvic organ prolapse. Treatment may be conservative or surgical according to symptoms, prolapse degree and not forgetting both patient and doctor preferences. Identify the most efficient surgical treatment to treat cystocele and its recurrences. Scientific literature was reviewed searching PubMed/MEDLINE database for articles published between 1996 and 2015 and using the terms pelvic organ prolapse, cystocele, mesh surgery, traditional repair, pelvic organ prolapse recurrence, complications, sexual function. There are two different surgical approaches for the treatment of cystocele: traditional repair and mesh repair. Prosthetic treatment gives higher anatomical success rate and fewer recurrence while traditional anterior repair has less complications. Surgical treatment in general improves both the anatomical success rate and the quality of life. The choice of surgery, between traditional and mesh repair, has to be personalized related to the prolapse grade and women tissues.