Comparison of two different concepts of mesh and fixation technique in laparoscopic ventral hernia repair: a randomized controlled trial

Standardization of laparoscopic intraperitoneal onlay mesh repair for incisional hernia: Impact on clinical outcome and quality-of-life (LIPOM trial, NCT 02089958)

Purpose

Current available outcome data following laparoscopic intraperitoneal onlay mesh repair (IPOM) for incisional hernia (IH) are comparable to a limited extent only because of a huge number of variability particulary in surgical technique and use of medical devices. In this prospective observational multicenter cohort study we evaluate the impact of a consensus driven standard protocol for IPOM, that is mesh fixation with absorbable tacks in double crown technique enforced by additional non-absorbable transfascial sutures at the edges of the mesh along with the use of Physiomesh™, on clinical and patient reported outcome measures.

Methods

A total of 102 consecutive patients were screened for eligibility between September 2013 and October 2014. 85 patients (IH: EHS W1: n = 39, W2: n = 46) were included into the study. Clinical examination and PROM for pain and quality of life measure (Carolina Comfort Scale, CCS) were performed at baseline, during hospital stay and at 6 weeks, 6 months and 1 year follow-up.

Results

The follow-up rate was 87,1 % for the primary endpoint. The Kaplan-Meier estimate for freedom-of-recurrence at 1 year was 95.9 % (95 %-CI: 87.9-98.7 %), the cumulative recurrence rate at 1 year was 4.1 % (95 %-CI: 0.9-11.7 %). There was no intraoperative complication. One seroma (type I; 1/84 (1,2 %), 95 %-CI: 0-7.1 %) was diagnosed during hospital stay. 12 seroma (n = 12/74 (16,2 %), 95 %-CI: 9.4-26.4 %; n = 10 type II and n = 2 type IV) were diagnosed during follow-up requiring surgical intervention in 1 patient (1,4 %, Clavien Dindo grade IIIb). Subcutaneous hematoma were found during follow-up in 8 patients (8/75 (10.7 %); 95 %-CI: 5.3-19.9) with need for surgical intervention in 2 patients (2,7 %, Clavien Dindo grade IIIb). There were 3 superficial surgical site infections (3/74 (4,1 %); 95 %-CI: 0.9-11.7 %, Clavien-Dindo grade I) without need for reoperation. Patient reported pain as measured by numeric rating scale at baseline was 1.36 ± 1.53 and 0.35 ± 1.04 at 1 year follow-up. CCS total scores indicated a good outcome with a decrease to 2.80 ± 6.47 (Min: 0, Q1: 0, Median: 0; Q3: 3.0; Max: 38.0) at 1 year follow-up. Subscore sensation of mesh decreased from 4.01 ± 6.76 (min: 0, Q1: 0, Median: 0; Q3: 5.0; Max: 28.0) at 6 weeks to 1.67 ± 3.99 (Min: 0, Q1: 0, Median: 0; Q3: 1.0; Max: 21.0) after 6 months and 0.90 ± 2.69 (Min: 0, Q1: 0, Median: 0; Q3: 0; Max: 14.0) after 1 year follow-up. Subscores pain and movement limitation both decreased during follow-up and were significantly reduced at 1 year compared to preoperative assessment (p < 0.001).

Conclusions

This study showed favourable clinical and patient reported outcomes and a low rate of recurrences at 1 year follow-up after IPOM for elective IH applying a standardized surgical technique including the use of Physiomesh™. In view of the data leading to the market withdrawal of the Physiomesh™, one might conclude, that the described standard may have contributed to a compensation of the suspected delay in tissue integration of the Physiomesh™ resulting in a more proper mesh fixation compared to absorbable tack fixation with/without absorbable TFS. This may lead to the general appraisal, that the fixation technique has to be adapted to the individual characteristics of type of mesh and fixation devices and the planned anatomic landing zone of the mesh.

Laparoscopic intraperitoneal onlay mesh (IPOM) with fascial repair (IPOM-plus) for ventral and incisional hernia: a systematic review and meta-analysis

PURPOSE

Despite advancements in laparoscopic ventral hernia repair (LVHR) using the intraperitoneal onlay mesh technique (sIPOM), recurrence remains a common postoperative complication. The objective of this systematic review and meta-analysis is to compare the efficacy of defect closure (IPOM-plus) versus non-closure in ventral and incisional hernia repair. The aim is to determine which technique yields better outcomes in terms of reducing recurrence and complication rates.

METHODS

A comprehensive literature review was conducted in the PubMed, Web of Science, Cochrane Library, Embase, and ClinicalTrials.gov databases from their inception until October 1, 2022, to identify all online English publications that compared the outcomes of laparoscopic ventral hernia repair with and without fascia closure.

RESULTS

Three randomized controlled trials (RCTs) and eleven cohort studies involving 1585 patients met the inclusion criteria. The IPOM-plus technique was found to reduce the recurrence of hernias (OR = 0.51, 95% CI [0.35, 0.76], p < 0.01), seroma (OR = 0.48, 95% CI [0.32, 0.71], p < 0.01), and mesh bulging (OR = 0.08, 95% CI [0.01, 0.42], p < 0.01). Subgroup analysis revealed that body mass index (BMI) (OR = 0.43, 95% CI [0.29, 0.65], p < 0.0001), type of article (OR = 0.51, 95% CI [0.35, 0.76], p = 0.0008 < 0.01), geographical location (OR = 0.54, 95% CI [0.36, 0.82], p = 0.004 < 0.01), follow-up time (OR = 0.50, 95% CI [0.34, 0.73], p = 0.0004 < 0.01) had a significant influence on the postoperative recurrence of the IPOM-plus technique.

CONCLUSION

The IPOM-plus technique has been shown to greatly reduce the occurrence of recurrence, seroma, and mesh bulging. Overall, the IPOM-plus technique is considered a safe and effective procedure. However, additional randomized controlled studies with extended follow-up periods are necessary to further evaluate the IPOM-plus technique.

Biomechanical causes for failure of the Physiomesh/Securestrap system

This study investigates the mechanical behavior of the Physiomesh/Securestrap system, a hernia repair system used for IPOM procedures associated with high failure rates. The study involved conducting mechanical experiments and numerical simulations to investigate the mechanical behavior of the Physiomesh/Securestrap system under pressure load. Uniaxial tension tests were conducted to determine the elasticity modulus of the Physiomesh in various directions and the strength of the mesh-tissue-staple junction. Ex-vivo experiments on porcine abdominal wall models were performed to observe the system's behavior under simulated intra-abdominal pressure load. Numerical simulations using finite element analysis were employed to support the experimental findings. The results reveal nonlinearity, anisotropy, and non-homogeneity in the mechanical properties of the Physiomesh, with stress concentration observed in the polydioxanone (PDO) stripe. The mesh-tissue junction exhibited inadequate fixation strength, leading to staple pull-out or breakage. The ex-vivo models demonstrated failure under higher pressure loads. Numerical simulations supported these findings, revealing the reaction forces exceeding the experimentally determined strength of the mesh-tissue-staple junction. The implications of this study extend beyond the specific case of the Physiomesh/Securestrap system, providing insights into the mechanics of implant-tissue systems. By considering biomechanical factors, researchers and clinicians can make informed decisions to develop improved implants that mimic the mechanics of a healthy abdominal wall. This knowledge can contribute to better surgical outcomes and reduce complications in abdominal hernia repair and to avoid similar failures in future.

Reoperation for Recurrence is Affected by Type of Mesh in Laparoscopic Ventral Hernia Repair: A Nationwide Cohort Study

OBJECTIVE

To compare the reoperation rate for recurrence between different mesh types in laparoscopic ventral hernia repair.

SUMMARY OF BACKGROUND DATA

Ventral hernia repair has improved over the last decades. Nevertheless, recurrence rates are still high, and one type of mesh was recently found to increase it even more.

METHODS

A nationwide cohort study based on prospectively collected data from the Danish Ventral Hernia Database. We included adult patients that had undergone a laparoscopic ventral hernia repair for either an incisional or a primary hernia. The primary and incisional hernias were analyzed in separate cohorts. The mesh-group with the lowest reoperation for recurrence curve was used as the reference. The outcome was reoperation for recurrence.

RESULTS

Study population comprised 2874 patients with primary hernias and 2726 with incisional hernias. For primary hernias, Physiomesh [HR = 3.45 (2.16-5.51)] and Proceed Surgical Mesh [HR = 2.53 (1.35-4.75)] had a significantly higher risk of reoperation for recurrence than DynaMesh-IPOM. For incisional hernias, Physiomesh [HR = 3.90 (1.80-8.46), Ventralex Hernia Patch (HR = 2.99 (1.13-7.93), Parietex Composite (incl. Optimized) (HR = 2.55 (1.17-5.55), and Proceed Surgical Mesh (HR = 2.63 (1.11-6.20)] all had a significantly higher risk of reoperation for recurrence than Ventralight ST Mesh.

CONCLUSION

For primary hernias, Physiomesh and Proceed Surgical Mesh had a significantly higher risk of reoperation for recurrence compared with DynaMesh-IPOM. For incisional hernias, the risk was significantly higher for Physiomesh, Parietex Composite, Ventralex Hernia Patch, and Proceed Surgical Mesh compared with Ventralight ST Mesh. This indicates that type of mesh may be associated with outcomes, and mesh choice could therefore depend on hernia type.

Mesh fixation techniques in primary ventral or incisional hernia repair

BACKGROUND

The use of a mesh in primary ventral or incisional hernia repair lowers the recurrence rate  and is the accepted standard of care for larger defects. In laparoscopic primary ventral or incisional hernia repair the insertion of a mesh is indispensable. Different mesh fixation techniques have been used and refined over the years. The type of fixation technique is claimed to have a major impact on recurrence rates, chronic pain, health-related quality of life (HRQOL) and complication rates.

OBJECTIVES

To determine the impact of different mesh fixation techniques for primary and incisional ventral hernia repair on hernia recurrence, chronic pain, HRQOL and complications.

SEARCH METHODS

On 2 October 2020 we searched CENTRAL, MEDLINE (Ovid MEDLINE(R)) Epub Ahead of Print, In-Process & Other Non-Indexed Citations, Ovid MEDLINE(R) Daily and Ovid MEDLINE(R)), Ovid Embase, and two trials registries. We also performed handsearches, and contacted experts from the European Hernia Society (EHS).

SELECTION CRITERIA

We included randomised controlled trials (RCTs) including adults with primary ventral or incisional hernia that compared different types of mesh fixation techniques (absorbable/nonabsorbable sutures, absorbable/nonabsorbable tacks, fibrin glue, and combinations of these techniques).

DATA COLLECTION AND ANALYSIS

We extracted data in standardised piloted tables, or if necessary, directly into Review Manager 5. We assessed risks of bias with the Cochrane 'Risk of bias' tool. Two review authors independently selected the publications, and extracted data on results. We calculated risk ratios (RRs) for binary outcomes and mean differences (MDs) for continuous outcomes. For pooling we used an inverse-variance random-effects meta-analysis or the Peto method in the case of rare events. We prepared GRADE 'Summary of findings' tables. For laparoscopic repair we considered absorbable tacks compared to nonabsorbable tacks, and nonabsorbable tacks compared to nonabsorbable sutures as key comparisons.

MAIN RESULTS

We included 10 trials with a total of 787 participants. The number of randomised participants ranged from 40 to 199 per comparison. Eight studies included participants with both primary and incisional ventral hernia. One study included only participants with umbilical hernia, and another only participants with incisional hernia. Hernia size varied between studies. We judged the risk of bias as moderate to high. Absorbable tacks compared to nonabsorbable tacks Recurrence rates in the groups were similar (RR 0.74, 95% confidence interval (CI) 0.17 to 3.22; 2 studies, 101 participants). It is uncertain whether there is a difference between absorbable tacks and nonabsorbable tacks in recurrence because the certainty of evidence was very low. Evidence suggests that the difference between groups in early postoperative, late follow-up, chronic pain and HRQOL is negligible. Nonabsorbable tacks compared to nonabsorbable sutures At six months there was one recurrence in each group (RR 1.00, 95% CI 0.07 to 14.79; 1 study, 36 participants). It is uncertain whether there is a difference between nonabsorbable tacks and nonabsorbable sutures in recurrence because the certainty of evidence was very low. Evidence suggests that the difference between groups in early postoperative, late follow-up and chronic pain is negligible. We found no study that assessed HRQOL. Absorbable tacks compared to absorbable sutures No recurrence was observed at one year (very low certainty of evidence). Early postoperative pain was higher in the tacks group (VAS 0 - 10: MD -2.70, 95% CI -6.67 to 1.27; 1 study, 48 participants). It is uncertain whether there is a difference between absorbable tacks compared to absorbable sutures in early postoperative pain because the certainty of evidence was very low. The MD for late follow-up pain was -0.30 (95% CI -0.74 to 0.14; 1 study, 48 participants). We found no study that assessed HRQOL. Combination of different fixation types (tacks and sutures) or materials (absorbable and nonabsorbable) There were mostly negligible or only small differences between combinations (e.g. tacks plus sutures) compared to a single technique (e.g. sutures only), as well as combinations compared to other combinations (e.g. absorbable sutures combined with nonabsorbable sutures compared to absorbable tacks combined with nonabsorbable tacks) in all outcomes. It is uncertain whether there is an advantage for combining different fixation types or materials for recurrence, chronic pain, HRQOL and complications, because the evidence certainty was very low or low, or we found no study on important outcomes. Nonabsorbable tacks compared to fibrin sealant The two studies showed different directions of effects: one showed higher rates for nonabsorbable tacks, and the other showed higher rates for fibrin sealant. Low-certainty evidence suggests that the difference between groups in early postoperative, late follow-up, chronic pain and HRQOL is negligible. Absorbable tacks compared to fibrin sealant One recurrence in the tacks group and none in the fibrin sealant group were noted after one year (low certainty of evidence). Early postoperative pain might be slightly lower using tacks (VAS 0 - 100; MD -12.40, 95% CI -27.60 to, 2.80;1 study, 50 participants; low-certainty evidence). The pattern of pain and HRQOL course over time (up to 1 year) was similar in the groups (low certainty of evidence).

AUTHORS' CONCLUSIONS

Currently none of the techniques can be considered superior to any other, because the certainty of evidence was low or very low for all outcomes.

A systematic review of outcome reporting in incisional hernia surgery

Background

The incidence of incisional hernia is up to 20 per cent after abdominal surgery. The management of patients with incisional hernia can be complex with an array of techniques and meshes available. Ensuring consistency in reporting outcomes across studies on incisional hernia is important and will enable appropriate interpretation, comparison and data synthesis across a range of clinical and operative treatment strategies.

Methods

Literature searches were performed in MEDLINE and EMBASE (from 1 January 2010 to 31 December 2019) and the Cochrane Central Register of Controlled Trials. All studies documenting clinical and patient-reported outcomes for incisional hernia were included.

Results

In total, 1340 studies were screened, of which 92 were included, reporting outcomes on 12 292 patients undergoing incisional hernia repair. Eight broad-based outcome domains were identified, including patient and clinical demographics, hernia-related symptoms, hernia morphology, recurrent incisional hernia, operative variables, postoperative variables, follow-up and patient-reported outcomes. Clinical outcomes such as hernia recurrence rates were reported in 80 studies (87 per cent). A total of nine different definitions for detecting hernia recurrence were identified. Patient-reported outcomes were reported in 31 studies (34 per cent), with 18 different assessment measures used.

Conclusions

This review demonstrates the significant heterogeneity in outcome reporting in incisional hernia studies, with significant variation in outcome assessment and definitions. This is coupled with significant under-reporting of patient-reported outcomes.

Chinese expert consensus on adult ventral abdominal wall defect repair and reconstruction

BACKGROUND

Surgical management of patients with ventral abdominal wall defects, especially complex abdominal wall defects, remains a challenging problem for abdominal wall reconstructive surgeons. Effective surgical treatment requires appropriate preoperative assessment, surgical planning, and correct operative procedure in order to improve postoperative clinical outcomes and minimize complications. Although substantial advances have been made in surgical techniques and prosthetic technologies, there is still insufficient high-level evidence favoring a specific technique. Broad variability in existing practice patterns, including clinical pre-operative evaluation, surgical techniques and surgical procedure selection, are still common.

DATA SOURCES

With the purpose of providing a best practice algorithm, a comprehensive search was conducted in Medline and PubMed. Sixty-four surgeons considered as experts on abdominal wall defect repair and reconstruction in China were solicited to develop a Chinese consensus and give recommendations to help surgeons standardize their techniques and improve clinical results.

CONCLUSIONS

This consensus serves as a starting point to provide recommendations for adult ventral abdominal wall repair and reconstruction in China and may help build opportunities for international cooperation to refine AWR practice.

Laparoscopic Repair of Ventral and other hernias of the abdominal wall with Composite meshes (Ventralight ST with Echo PS System and Physiomesh): Our case series of 101 patients and the literature

•

The incidence of ventral hernias varies from 4 to 10% depending on the type of surgery.

•

Careful patient selection is one of the main methods of choice.

•

Laparoscopic ventral hernia repair with Ventralight ST/Sorbafix is a safe and effective technique with low postoperative morbidity and low reoperation rate.

Introduction

A meta-analysis of studies has shown that the incidence of ventral hernias varies from 4 to 10%. During the last twenty years, the use of laparoscopic repair of ventral and other hernias of the abdominal wall has rapidly increased.

Presentation of cases

From January 2011 to March 2020 101 patients underwent laparoscopic ventral hernia repair (LVHR).

The diameter of the hernial defect intraoperatively was in average 6.22 ± 5.17 cm (SD) (range 2–30 cm). The difference with the defect diameter measured in CT is small (average 0.77 ± 2.21 cm). The mean operative time was 96.20 min. We used Physiomesh and Secure strap in 37 cases and Ventralight ST plus Sorbafix in 58 cases. The conversion rate was 6.93%. The mean hospital stay was 6.03 days. The 30-day mortality was 0%. The overall morbidity was 11.88%.

Discussion

LVHR indications are debated. The IEHS guidelines and the EAES/EHS Consensus conference of 2015 discussed the main indications, contraindications, and features of laparoscopic techniques. Laparoscopic approach seemed to have some benefits: absence of intraparietal dissection, of postoperative immobilization, lower risk of bronchopulmonary complications and lesser abdominal pain. We compared our case series with other similar studies, and we revealed our short-term outcomes are in line with literature.

Conclusion

Our case series revealed that the LVHR with Ventralight ST/Sorbafix is a safe and effective technique with low postoperative morbidity and low reoperation rate. Careful patient selection is one of the main methods of choice. Studies with higher level of evidence are needed.

Differential recurrence after laparoscopic incisional hernia repair: importance of a nationwide registry-based mesh surveillance

BACKGROUND

Identification of suboptimal mesh products is essential to improve the outcome after hernia surgery. This study investigated whether a national clinical database combined with administrative registries may serve as a tool for postmarketing evaluation of mesh products for hernia surgery.

METHODS

This was a propensity score-matched case-control cohort study comparing outcomes in patients undergoing laparoscopic incisional hernia repair with either one particular mesh or any other synthetic mesh. Data on patients registered in the Danish Ventral Hernia Database between 2010 and 2016 were combined with administrative data from the Danish National Patient Registry. The primary outcome was operation for recurrence. Secondary outcomes were 30-day readmission, 30-day reoperation for complications (excluding hernia recurrence), and mortality after 30 and 90 days.

RESULTS

In total, 740 patients who underwent repair with one particular mesh were matched with 1479 patients who received any other synthetic mesh. The rate of repair for hernia recurrence was significantly higher in the particular mesh group than in the reference group: 12·8 versus 6·3 per cent respectively (hazard ratio 2·09, 95 per cent c.i. 1·57 to 2·79; P < 0·001). Use of the particular mesh increased the risk of readmission (odds ratio (OR) 1·53, 1·16 to 2·01; P = 0·002) and reoperation for a complication (OR 1·60, 1·03 to 2·47, P = 0·030). No difference in mortality was found.

CONCLUSION

Clinical registries with prospectively collected data can provide long-term surveillance of commercial mesh. Laparoscopic incisional hernia repair with one particular mesh was associated with an increased rate of short-term complications and double the risk of repair for recurrence.

The Importance of Registries in the Postmarketing Surveillance of Surgical Meshes

Objective:

To assess the role of registries in the postmarketing surveillance of surgical meshes.

Background:

To date, surgical meshes are classified as group II medical devices. Class II devices do not require premarket clearance by clinical studies. Ethicon initiated a voluntary market withdrawal of Physiomesh for laparoscopic use after an analysis of unpublished data from the 2 large independent hernia registries—Herniamed German Registry and Danish Hernia Database. This paper now presents the relevant data from the Herniamed Registry.

Methods:

The present analysis compares the prospective perioperative and 1-year follow-up data collected for all patients with incisional hernia who had undergone elective laparoscopic intraperitoneal onlay mesh repair either with Physiomesh (n = 1380) or with other meshes recommended in the guidelines (n = 3834).

Results:

Patients with Physiomesh repair had a markedly higher recurrence rate compared with the other recommended meshes (12.0% vs 5.0%; P < 0.001). In the multivariable analysis, the recurrence rate was highly significantly influenced by the mesh type used (P < 0.001). If Physiomesh was used, that led to a highly significant increase in the recurrence rate on 1-year follow-up (odds ratio 2.570, 95% CI 2.057, 3.210). The mesh type used also had a significant influence on chronic pain rates.

Conclusions:

The importance of real-world data for postmarketing surveillance of surgical meshes has been demonstrated in this registry-based study. Randomized controlled trials are needed for premarket approval of new devices. The role of sponsorship of device studies by the manufacturing company must be taken into account.

Laparoscopic Incisional and Ventral Hernia Repair with Absorbable Tacks in a Long Term Follow-up: A Retrospective Control Study

BACKGROUND

Laparoscopic Incisional and Ventral Hernia Repair (LIVHR) is a safe and worldwide accepted procedure performed using absorbable tacks. The aim of the study was to evaluate recurrence rate in a long term follow-up and whether the results of laparoscopic IVH repair in the elderly (≥65 years old) are different with respect to results obtained in younger patients.

METHODS

One hundred and twenty-nine consecutive patients (74 women and 55 men, median age 67 years, range = 30-87 years) with ventral (N = 42, 32.5%) or post incisional (N = 87, 67.5%) hernia were enrolled in the study. Patients were divided into two groups according to their age: group A (N = 55, 42.6%) aged <65 years and group B (N = 74, 57.4%) aged ≥65 years.

RESULTS

The mean operative time was not significantly different between groups (66.7 ± 37 vs. 74 ± 48.4 min, p = 0.4). To the end of 2016, seven recurrences had occurred (group A = 3, group B = 4, p = 1). Complications occurred in 8 (16%) patients in group A and 21 (28.3%) patients in group B.

CONCLUSION

In conclusion, our results confirm that the use of absorbable tacks does not increase recurrence frequency and laparoscopic incisional and ventral repair is a safety procedure also in elderly patients.

Mesh implants for hernia repair: an update

INTRODUCTION

Today the use of textile meshes has become a standard for the treatment of abdominal wall hernias and for the reinforcement of any tissue repair as the strength of the implant decreases the recurrence rates. With increasing use, side effects of the textile implants became apparent, as well.

AREAS COVERED

Based on publications in Medline over the past decade, general and specific benefits, as well as risks, are discussed with the challenge to define individual risk-benefit ratios. For meshes, certain high-risk or low-risk conditions can be defined. In an attempt to eliminate mesh-related risks, quality control for medical devices has meanwhile been revised. In both the USA and the EU post-market surveillance studies are required to keep medical devices approved.

EXPERT COMMENTARY

The impact of material on the complication rate will vary depending on the patient's co-morbidity or the risks of the procedure. Even the best material can end up with disappointing results in case of poor healing or poor surgery. On the other hand, when using high-risk devices, most of the complications after excellent surgery with excellent indication can be supposed to be mesh-related. Thus, the use of low-risk devices is recommended even though its advantage may not be demonstrable in clinical studies.

Postoperative Pain After Laparoscopic Repair of Primary Umbilical Hernia: Titanium Tacks Versus Absorbable Tacks: A Prospective Comparative Cohort Analysis of 80 Patients With a Long-term Follow-up

We investigated if a novel fixation device with absorbable tacks (Securestrap) causes less early and chronic postoperative pain after laparoscopic repair with a double-crown mesh fixation of ventral abdominal wall hernia when compared with the standard fixation device with nonabsorbable titanium tacks (Protack). The primary outcome measure was early postoperative pain at 2, 6, and 12 weeks postoperatively. The secondary outcome measure was chronic postoperative pain measured ≥18 months after surgery. Pain levels were assessed using a visual analog scale ranging from 0 (no pain) to 100 mm (excruciating pain). Early postoperative pain was significantly lower in group 2 (absorbable tacks) at 6 (2 vs. 5; P=0.008) and 12 weeks (1 vs. 2; P=0.008) but not at follow-up (6 vs. 11; P=0.21). Given the very low visual analog scale scores in both groups, the clinical significance of these finding remains open to discussion.

Systematic review and network meta-analysis of methods of mesh fixation during laparoscopic ventral hernia repair

BACKGROUND

Ventral hernia repairs are common and have high recurrence rates. They are usually repaired laparoscopically with an intraperitoneal mesh, which can be fixed in various ways. The aim was to evaluate the recurrence rates for the different fixation techniques.

METHODS

This systematic review included studies with human adults with a ventral hernia repaired with an intraperitoneal onlay mesh. The outcome was recurrence at least 6 months after operation. Cohort studies with 50 or more participants and all RCTs were included. PubMed, Embase and the Cochrane Library were searched on 22 September 2016. RCTs were assessed with the Cochrane risk-of-bias assessment tool and cohort studies with the Newcastle-Ottawa scale. Studies comparing fixation techniques were included in a network meta-analysis, which allowed comparison of more than two fixation techniques.

RESULTS

Fifty-one studies with a total of 6553 participants were included. The overall crude recurrence rates with the various fixation techniques were: absorbable tacks, 17·5 per cent (2 treatment groups); absorbable tacks with sutures, 0·7 per cent (3); permanent tacks, 7·7 per cent (20); permanent tacks with sutures, 6·0 per cent (25); and sutures, 1·5 per cent (6). Six studies were included in a network meta-analysis, which favoured fixation with sutures. Although statistical significance was not achieved, there was a 93 per cent chance of sutures being better than one of the other methods.

CONCLUSION

Both crude recurrence rates and the network meta-analysis favoured fixation with sutures during laparoscopic ventral hernia repair.

Double-blind randomized controlled trial of collagen mesh for the prevention of abdominal incisional hernia in patients having a vertical rectus abdominis myocutaneus flap during surgery for advanced pelvic malignancy

AIM

The study investigated the effect of collagen mesh-assisted closure at the donor site in preventing the formation of incisional hernia following construction of a vertical rectus abdominis myocutaneus (VRAM) flap as part of pelvic surgery for recurrent colorectal cancer.

METHOD

The study was a double-blinded randomized controlled superiority trial that was designed and performed according to the Consolidated Standards of Reporting Trials (CONSORT) Statement. Eligible patients undergoing surgery that included a VRAM flap for advanced colorectal pelvic malignancy were prospectively randomized to conventional abdominal wound closure or collagen mesh-assisted closure. The primary end-point was incisional herniation at 1 year confirmed by CT. Secondary end-points were CT-verified incisional herniation at 3 and 36 months, clinically recognizable incisional herniation, donor-site and reconstructive-site complications, surgical mortality, postoperative morbidity, postoperative recovery and survival.

RESULTS

In total, 58 (29 conventional closure; 29 mesh-assisted closure) patients were included. At 1 year, incisional herniation on the CT scan was found in 12 (50%) of 24 patients in the conventional closure group, and in 8 (33%) of 24 in the mesh-assisted closure group (P = 0.38). No significant difference between the groups was found in surgical mortality, early or late complications or survival. Donor-site morbidity was comparable between the two groups.

CONCLUSION

No preventative effect of collagen mesh-assisted closure was observed following VRAM flap reconstruction.

Laparoscopic mesh repair of adult diaphragmatic hernia: A report of two cases

Congenital diaphragmatic hernia is very rare in adults. The first choice of treatment is surgery, but the optimal surgical method remains unclear. We performed laparoscopic surgeries for two types of congenital diaphragmatic hernias using a novel mesh coated with a chemically modified substance. The first patient was a 65-year-old man with a Bochdalek hernia without a hernial sac, and the other patient was an 80-year-old woman with a Morgagni hernia with a hernial sac. The short-term outcomes of both cases were good, and laparoscopic repair seems to be a useful strategy regardless of the presence or absence of a hernial sac.

Laparoscopic versus open ventral hernia repair in patients with chronic liver disease

BACKGROUND

Previous studies demonstrated laparoscopic ventral hernia repair (LVHR) to be associated with fewer short-term complications than open ventral hernia repair (OVHR). Little literature is available comparing LVHR and OVHR in chronic liver disease (CLD) patients.

METHODS

Patients with model for end-stage liver disease score ≥9 who underwent elective ventral hernia repair in the National Surgical Quality Improvement Program Database were included. 30-day outcomes were compared between LVHR and OVHR after adjusting for hernia disease severity, baseline comorbidities and demographic factors.

RESULTS

A total of 3594 ventral hernia repairs were included, 536 (14.9 %) of which were LVHR. After adjusting for other confounders, LVHR was associated with a lower incidence of wound-related complications (0.23, 95 % CI 0.07-0.74, p = 0.01), shorter length of stay (mean 3.7 vs. 5.0 days, p < 0.01) than OVHR, but similar systemic complications (p = 0.77), bleeding complications (p = 0.69), unplanned reoperation (p = 0.74) or readmission (p = 0.40). Propensity score-matched comparison showed similar conclusions. Five hundred and sixty-two patients had ascites, among whom 35 (6.2 %) underwent LVHR. In this subcohort, LVHR was associated with higher mortality (OR 5.36, 95 % CI 1.00-28.60, p = 0.05), systemic complications (OR 7.03, 95 % CI 2.06-24.00, p < 0.01), and unplanned reoperation (OR 6.03, 95 % CI 1.51-24.12, p = 0.01) than OVHR.

CONCLUSIONS

In comparison with OVHR, LVHR is associated with similar short-term outcomes except for lower wound-related complications and shorter length of stay in CLD patients. However, when patients have ascites, LVHR is associated with higher mortality, systemic complications, and unplanned reoperation.

Outcomes of bridging versus mesh augmentation in laparoscopic repair of small and medium midline ventral hernias

BACKGROUND

Bridging of the hernia defect in laparoscopic repair (sIPOM) technique does not fully restore the abdominal wall function. Closure of hernia defect in IPOM-plus technique leads to the restoration of abdominal wall function and improved long-term treatment outcomes. Against the expectations, the studies confirm the formation of intraabdominal adhesions to the mesh. Regardless of the above, the search of the proper technique for mesh implantation and fixation is still ongoing. There have also been attempts to identify groups of patients who may still benefit from IPOM procedure.

MATERIALS AND METHODS

Patients with midline abdominal wall hernias up to 10 cm wide were enrolled in the study except for subxiphoid and suprapubic hernias. Between 2011 and 2014 we performed 82 hernia repairs using the laparoscopic technique with Physiomesh. Patients were divided into sIPOM and IPOM-plus groups. The study included 44M and 38F patients aged 27-84 years. After 12-months and again in August 2015 a survey was posted to all patients with questions regarding potential recurrence.

RESULTS

After 12 months, eight patients (20 %) in sIPOM group reported subjectively perceived recurrence and none in IPOM-plus group (p = 0.002). Six patients (14.3 %) in sIPOM group reported suspected recurrence, as compared to three patients (7.1 %) in IPOM-plus group (p = 0.13). These patients were invited for a follow-up physical examination and sonography. Eventually, four cases of hernia recurrence were confirmed in sIPOM group (10 %) and none in IPOM-plus group (p = 0.018). Other patients presented with mesh bulging.

CONCLUSIONS

Laparoscopic ventral hernia repair is generally safe and is associated with the low recurrence rate. Closure of fascial defects before mesh insertion offers better treatment outcomes. Non-closure of fascial defects with only bridging of the hernia defect (sIPOM) causes more frequent recurrence and bulging. As a result, patient satisfaction with treatment is lower, and they are concerned about hernia recurrence.

Current Status and Challenges of Laparoscopy in Ventral Hernia Repair

Laparoscopic repair of ventral hernias gained strong popularity in the late nineties with some of the early enthusiasm lost later in time. We review the current status and challenges of laparoscopy in ventral hernia repair and best practices in this area. We specifically looked at patient and hernia defect factors, technical considerations that have contributed to the successes, and some of the failures of laparoscopic ventral hernia repair (LVHR). Patients best suited for a laparoscopic repair are those who are obese and diabetic with a total defect size not to exceed 10 cm in width or a "Swiss cheese" defect. Overlap of mesh to healthy fascia of at least 5 cm in every direction, with closure of the defect, is essential to prevent recurrence or bulging over time. Complications specifically related to surgical site occurrence favor the laparoscopic approach. Recurrence rates, satisfaction, and health-related quality of life results are similar to open repairs, but long-term data are lacking. There is still conflicting data regarding ways of fixating the mesh. The science of prosthetic material appropriate for intraperitoneal placement continues to evolve. The field continues to be plagued by single author, single institution, and small nonrandomized observational studies with short-term follow-up. The recent development of large prospective databases might allow for pragmatic and point-of-care studies with long-term follow-up. We conclude that LVHR has evolved since its inception, has overcome many challenges, but still needs better long-term studies to evaluate evolving practices.