More than 150 consecutive open umbilical hernia repairs in a major Veterans Administration Medical Center

The impact of smoking on ventral and inguinal hernia repair: a systematic review and meta-analysis

PURPOSE

Individual studies indicate poorer outcomes for smokers after hernia repair. Previous meta-analyses have examined the impact of smoking on specific outcomes such as recurrence and surgical site infection, but there has been a lack of comprehensive consensus or systematic review on this subject. Addressing this gap, our study undertakes a systematic review and meta-analysis to assess the impact of smoking on the outcomes of ventral hernia repair (VHR) and inguinal hernia repair.

SOURCE

A thorough search of Cochrane Central, Scopus, SciELO, and PubMed/MEDLINE, focusing on studies that examined the effect of smoking on inguinal and VHR outcomes was conducted. Key outcomes evaluated included recurrence, reoperation, surgical site occurrences (SSO), surgical site infection (SSI), and seroma.

PRINCIPAL FINDINGS

Out of 3296 screened studies, 42 met the inclusion criteria. These comprised 25 studies (69,295 patients) on VHR and 17 studies (204,337 patients) on inguinal hernia repair. The analysis revealed that smokers had significantly higher rates of recurrence (10.4% vs. 9.1%; RR 1.48; 95% CI [1.15; 1.90]; P < 0.01), SSO (13.6% vs. 12.7%; RR 1.44; 95% CI [1.12; 1.86]; P < 0.01) and SSI (6.6% vs. 4.2%; RR 1.64; 95% CI [1.38; 1.94]; P < 0.01) following VHR. Additionally, smokers undergoing inguinal hernia repair showed higher recurrence (9% vs. 8.7%; RR 1.91; 95% CI [1.21; 3.01]; P < 0.01), SSI (0.6% vs. 0.3%; RR 1.6; 95% CI [1.21; 2.0]; P < 0.001), and chronic pain (9.9% vs. 10%; RR 1.24; 95% CI [1.06; 1.45]; P < 0.01) rates. No significant differences were observed in seroma (RR 2.63; 95% CI [0.88; 7.91]; P = 0.084) and reoperation rates (RR 1.48; 95% CI [0.77; 2.85]; P = 0.236) for VHR, and in reoperation rates (RR 0.99; 95% CI [0.51; 1.91]; P = 0.978) for inguinal hernias between smokers and non-smokers. Analysis using funnel plots and Egger's test showed the absence of publication bias in the study outcomes.

CONCLUSION

This comprehensive meta-analysis found statistically significant increases in recurrence rates, and immediate postoperative complications, such as SSO and SSI following inguinal and VHR. Also, our subgroup analysis suggests that the MIS approach seems to be protective of adverse outcomes in the smokers group. However, our findings suggest that these findings are not of clinical relevance, so our data do not support the necessity of smoking cessation before hernia surgery. More studies are needed to elucidate the specific consequences of smoking in both inguinal and ventral hernia repair.

PROSPERO REGISTRATION

ID CRD42024517640.

Short-term complications after onlay versus preperitoneal mesh repair of umbilical hernias: a prospective randomized double-blind trial

PURPOSE

To compare the incidence of surgical site occurrences (SSOs) following onlay versus preperitoneal mesh placement in elective open umbilical hernia repairs.

METHODS

This study presents a secondary analysis of a randomized double-blind trial conducted on female patients with primary umbilical hernias admitted to a general hospital, in a residency training program setting. Fifty-six subjects were randomly assigned to either onlay (n=30) or preperitoneal (n=26) mesh repair group. Data on baseline demographics, past medical history, perioperative details, postoperative pain (visual analogue scale (VAS)), wound-related complications, and recurrence were assessed using a standardized protocol.

RESULTS

No statistically significant differences were observed between groups regarding patients' demographics, comorbidities, or defect size. Operative time averaged 67.5 (28-110) min for onlay and 50.5 (31-90) min for preperitoneal repairs, p=.03. The overall rate of SSOs was 21.4% (n=12), mainly in the onlay group (33% vs 7.7%; p=0.02, 95% CI 0.03-0.85) and mostly due to seromas. There were no between-group significant differences in postoperative VAS scores at all timepoints. After a maximum follow-up of 48 months, one recurrence was reported in the onlay group. By logistic regression, the onlay technique was the only independent risk factor for SSOs.

CONCLUSION

The presented data identified a decreased wound morbidity in preperitoneal umbilical hernia repairs, thus contributing to the limited body of evidence regarding mesh place selection in future guidelines. Further cases from this ongoing study and completion of follow-up are expected to also compare both techniques in terms of long-term outcomes.

TRIAL REGISTRATION NUMBER

Brazilian Registry of Clinical Trials (ReBEC) UTN code: U1111-1205-0065 (date of registration: March 27, 2018).

Hernia Size and Mesh Placement in Primary Umbilical Hernia Repair

INTRODUCTION

Umbilical hernia repair (UHR) using mesh has been demonstrated to significantly reduce recurrence. However, many surgical centers still perform tissue repair for UH. In the present study, we assessed a cohort of veteran patients undergoing a standard open tissue repair for primary UH to determine at which size recurrence may preclude tissue repair. A systematic review of the literature on hernia size recommendations to guide mesh placement was performed.

METHODS

A single-institution single-surgeon retrospective review of all patients undergoing open tissue repair of primary UH (n = 344) was undertaken at the VA North Texas Health Care System between 2005 and 2019. Guidelines for the preferred reporting items for systematic reviews and meta-analysis were undertaken for systematic review.

RESULTS

A literature review yielded inconsistent guidance for a specific hernia size to proceed with tissue vs. mesh repair. Our institutional review yielded 17 (4.9%) recurrences. Univariable analysis demonstrated recurrence to be associated with hernia size (2.8 vs. 2.3 cm; P = .04). However, on multivariable analysis, hernia size was demonstrated as not an independent predictor of recurrence [OR 1.47 (95% CI; .97-2.21; P = .07)].

CONCLUSION

A review of the literature suggests mesh placement most commonly when the hernia size is > 2.0 cm; however, sources of evidence are heterogeneous in study design, patient population, and hernia types studied. Our institutional review demonstrated that primary UHs < 2.3 cm can successfully be treated via tissue repair. Larger, recurrent, incisional, and primary epigastric hernias may benefit from mesh placement.

Trocar umbilical hernia repair by open suture repair and open suture-mesh repair in an ambulatory setting in comparison to recurrent and primary umbilical hernia repair

Reports on the ambulatory open repair of umbilical trocal hernias are missing. Patients with trocar, primary and recurrent umbilical hernia open suture and open suture–mesh repair with prospective follow-up were retrospectively evaluated. Patients received perioperative antibiotic prophylaxis, preemptive analgesia and modified anesthesia. In total, 171 patients with umbilical hernia (51 years, female 14%; male 86%) were treated with open suture (n = 29; 17%) and suture–mesh (n = 142; 83%) repair. In total, 10% of patients were treated for trocar hernia (late onset), 5% for recurrent hernia and 85% for a primary umbilical hernia. In total, 29% of trocar hernia repairs had minor complications associated with obesity (40%) and comorbidity (80%). Age, suture and suture–mesh repair were not associated with complications. According to guidelines for umbilical hernia repair open flat mesh may be useful in the treatment of trocar hernia.

Mesh versus suture in elective repair of umbilical hernia: systematic review and meta-analysis

BACKGROUND

Mesh repair of umbilical hernia has been associated with a reduced recurrence rate compared with suture closure, but potentially at the expense of increased postoperative complications and chronic pain. The objective of this systematic review and meta-analysis was to examine the outcomes after elective open mesh and suture repair for umbilical hernia in adults.

METHODS

A literature search was conducted to identify studies presenting original data on elective open mesh and suture repair of umbilical hernia. The primary outcome was hernia recurrence. Secondary outcomes included surgical-site infection (SSI), seroma, haematoma and chronic pain. Meta-analyses were undertaken.

RESULTS

The search resulted in 5353 hits and led to 14 studies being included (6 RCTs and 8 observational studies) describing a total of 2361 patients. Compared with suture, mesh repair was associated with a lower risk of recurrence (risk ratio (RR) 0·48, 95 per cent c.i. 0·30 to 0·77), with number needed to treat 19 (95 per cent c.i. 14 to 31). Mesh repair was associated with a higher risk of seroma (RR 2·37, 1·45 to 3·87), with number needed to harm 30 (17 to 86). There was no significant difference in the risk of SSI, haematoma or chronic pain.

CONCLUSION

The use of mesh in elective repair of umbilical hernia reduced the risk of recurrence compared with suture closure without altering the risk of chronic pain.

Variations in Nationwide Readmission Patterns after Umbilical Hernia Repair

Up to one in three readmissions occur at a different hospital and are thus missed by current quality metrics. There are no national studies examining 30-day readmission, including to different hospitals, after umbilical hernia repair (UHR). We tested the hypothesis that a large proportion were readmitted to a different hospital, that risk factors for readmission to a different hospital are unique, and that readmission costs differed between the index and different hospitals. The 2013 to 2014 Nationwide Readmissions Database was queried for patients admitted for UHR, and cost was calculated. Multivariate logistic regression identified risk factors for 30-day readmission at index and different hospitals. There were 102,650 admissions for UHR and 8.9 per cent readmissions, of which 15.8 per cent readmissions were to a different hospital. The most common reason for readmission was infection (25.8%). Risk factors for 30-day readmission to any hospital include bowel resection, index admission at a for-profit hospital, Medicare, Medicaid, and Charlson Comorbidity Index ≥ 2. Risk factors for 30-day readmission to a different hospital include elective operation, drug abuse, discharge to a skilled nursing facility, and leaving against medical advice. The median cost of initial admission was higher in those who were readmitted ($16,560 [$10,805–$29,014] vs $11,752 [$8151–$17,724], P < 0.01). The median cost of readmission was also higher among those readmitted to a different hospital ($9826 [$5497–$19,139] vs $9227 [$5211–$16,817], P = 0.02). After UHR, one in six readmissions occur at a different hospital, have unique risk factors, and are costlier. Current hospital benchmarks fail to capture this sub-population and, therefore, likely underestimate UHR readmissions.

Open mesh versus suture repair of umbilical hernia: Meta-analysis of randomized controlled trials

BACKGROUND

The optimal methodology of surgical treatment of umbilical hernia in adults remains controversial. Previously published randomized controlled trials (RCTs) and cohort studies have demonstrated advantage for open mesh over suture repair. Two published meta-analyses, including RCTs and retrospective cohort studies, have compared the outcomes of open mesh versus suture repair of umbilical hernia in adult, which were flawed since they included both elective and emergency repairs of umbilical hernias. The aim of this meta-analysis is to include RCTs to examine whether open mesh repair of umbilical hernia produces a better outcome than suture repair in adult patients.

METHODS

A literature search using Medline, Embase and Cochrane Database was performed, and meta-analysis was performed using RevMan 5.3.5 software. Outcomes evaluated incidence of hernia recurrence, wound infection, haematoma, seroma and patient death.

RESULTS

Of the 620 records identified, 4 RCTs, including 620 patients, were included in the meta-analysis. In the RCTS, when open mesh repair was compared with suture repair, open mesh repair was associated with significantly low incidence of recurrence (odds ratio (OR) 0.22, 95% confidence interval (CI) 0.10-0.48; P = 0.0001). The incidence of wound infection (OR 0.89, 95% CI 0.35-2.31; P = 0.82), haematoma (OR 0.83, 95% CI 0.28-2.41; P = 0.73), and seroma (OR 2.01, 95% CI 0.82-4.91; P = 0.13), were similar between the two groups.

CONCLUSIONS

Open mesh repair was associated with significant reduction in the recurrence rate in comparison to suture repair of umbilical hernia.

A short term analysis of surgical management of umbilical and paraumbilical hernia

Objective

Umbilical hernia and paraumbilical hernia are ventral herniae that occur in infants and adults. According to current evidence, mesh repair is the treatment of choice to avoid recurrence. The aim of this study is to analyze the surgical methods, the types of meshes used, and their benefits.

Material and Methods

A retrospective analysis of patients diagnosed with umbilical hernia and paraumbilical hernia was performed. The patients' consent was obtained retrospectively. The various surgical techniques and different meshes used were analyzed. Forty-three patients were selected for the study. Of these, 23 patients underwent open mesh repair, 12 patients underwent laparoscopic intraperitoneal onlay mesh repair repair, and eight patients underwent open intraperitoneal onlay mesh repair repair. The duration of the surgery, mesh used, number of days of hospital stay, type of anesthesia, and postoperative complications were analyzed.

Results

Of the 43 patients, the patients who underwent open intraperitoneal onlay mesh repair had shorter postoperative hospital stays compared to other methods (median=1 day; range=1 to 2 days). The duration of surgery was longer for laparoscopic intraperitoneal onlay mesh repair and open mesh repair compared to the open intraperitoneal onlay mesh repair technique (p<0.05).

Conclusion

The open intraperitoneal onlay mesh repair technique had advantages over the other methods for small-defect umbilical hernia and paraumbilical hernia. The duration of surgery was long for laparoscopic intraperitoneal onlay mesh repair compared to open mesh repair and the open intraperitoneal onlay mesh repair technique. Postoperative complications were insignificant for all three methods. Another advantage of the open intraperitoneal onlay mesh repair technique was a shorter postoperative hospital stay.

Mesh versus suture repair of umbilical hernia in adults: a randomised, double-blind, controlled, multicentre trial

BACKGROUND

Both mesh and suture repair are used for the treatment of umbilical hernias, but for smaller umbilical hernias (diameter 1-4 cm) there is little evidence whether mesh repair would be beneficial. In this study we aimed to investigate whether use of a mesh was better in reducing recurrence compared with suture repair for smaller umbilical hernias.

METHODS

We did a randomised, double-blind, controlled multicentre trial in 12 hospitals (nine in the Netherlands, two in Germany, and one in Italy). Eligible participants were adults aged at least 18 years with a primary umbilical hernia of diameter 1-4 cm, and were randomly assigned (1:1) intraoperatively to either suture repair or mesh repair. In the first 3 years of the inclusion period, blocked randomisation (of non-specified size) was achieved by an envelope randomisation system; after this time computer-generated randomisation was introduced. Patients, investigators, and analysts were masked to the allocated treatment, and participants were stratified by hernia size (1-2 cm and >2-4 cm). At study initiation, all surgeons were invited to training sessions to ensure they used the same standardised techniques for suture repair or mesh repair. Patients underwent physical examinations at 2 weeks, and 3, 12, and 24-30 months after the operation. The primary outcome was the rate of recurrences of the umbilical hernia after 24 months assessed in the modified intention-to-treat population by physical examination and, in case of any doubt, abdominal ultrasound. This trial is registered with ClinicalTrials.gov, number NCT00789230.

FINDINGS

Between June 21, 2006, and April 16, 2014, we randomly assigned 300 patients, 150 to mesh repair and 150 to suture repair. The median follow-up was 25·1 months (IQR 15·5-33·4). After a maximum follow-up of 30 months, there were fewer recurrences in the mesh group than in the suture group (six [4%] in 146 patients vs 17 [12%] in 138 patients; 2-year actuarial estimates of recurrence 3·6% [95% CI 1·4-9·4] vs 11·4% (6·8-18·9); p=0·01, hazard ratio 0·31, 95% CI 0·12-0·80, corresponding to a number needed to treat of 12·8). The most common postoperative complications were seroma (one [<1%] in the suture group vs five [3%] in the mesh group), haematoma (two [1%] vs three [2%]), and wound infection (one [<1%] vs three [2%]). There were no anaesthetic complications or postoperative deaths.

INTERPRETATION

This is the first study showing high level evidence for mesh repair in patients with small hernias of diameter 1-4 cm. Hence we suggest mesh repair should be used for operations on all patients with an umbilical hernia of this size.

FUNDING

Department of Surgery, Erasmus University Medical Center, Rotterdam, Netherlands.

Prospective Analysis of Epigastric, Umbilical, and Small Incisional Hernia Repair Using the Modified Kugel Oval Patch

The study was performed to determine the complication and recurrence rate using the modified Kugel oval patch for small ventral hernia repair. Another aim of the study was to find risk factors for recurrence in patients with this repair. Seventy-three patients underwent ventral hernia repair with the modified Kugel oval patch between April 2013 and February 2015. Prospective follow-up data (18 months postoperative) were collected and evaluated. A total of 58 primary (18 epigastric/40 umbilical) and 15 incisional ventral hernias were repaired with the modified Kugel oval patch (7.6/10.2 cm/8 x 12 cm). We found three patients suffered superficial wound infection and two participants got hernia recurrence. Placement of mesh was found to be a significant risk factor for hernia recurrence. Small ventral hernia repair using the modified Kugel oval patch is a novel and useful approach and we recommend placing the patch preperitoneally.

Stratification of surgical site infection by operative factors and comparison of infection rates after hernia repair

OBJECTIVE

To investigate whether operative factors are associated with risk of surgical site infection (SSI) after hernia repair.

DESIGN

Retrospective cohort study. Patients Commercially insured enrollees aged 6 months-64 years with International Classification of Diseases, Ninth Revision, Clinical Modification procedure or Current Procedural Terminology, fourth edition, codes for inguinal/femoral, umbilical, and incisional/ventral hernia repair procedures from January 1, 2004, through December 31, 2010.

METHODS

SSIs within 90 days after hernia repair were identified by diagnosis codes. The χ2 and Fisher exact tests were used to compare SSI incidence by operative factors.

RESULTS

A total of 119,973 hernia repair procedures were analyzed. The incidence of SSI differed significantly by anatomic site, with rates of 0.45% (352/77,666) for inguinal/femoral, 1.16% (288/24,917) for umbilical, and 4.11% (715/17,390) for incisional/ventral hernia repair. Within anatomic sites, the incidence of SSI was significantly higher for open versus laparoscopic inguinal/femoral (0.48% [295/61,142] vs 0.34% [57/16,524], P=.020) and incisional/ventral (4.20% [701/16,699] vs 2.03% [14/691], P=.005) hernia repairs. The rate of SSI was higher following procedures with bowel obstruction/necrosis than procedures without obstruction/necrosis for open inguinal/femoral (0.89% [48/5,422] vs 0.44% [247/55,720], P<.001) and umbilical (1.57% [131/8,355] vs 0.95% [157/16,562], P<.001), but not incisional/ventral hernia repair (4.01% [224/5,585] vs 4.16% [491/11,805], P=.645).

CONCLUSIONS

The incidence of SSI was highest after open procedures, incisional/ventral repairs, and hernia repairs with bowel obstruction/necrosis. Stratification of hernia repair SSI rates by some operative factors may facilitate accurate comparison of SSI rates between facilities.

External validation of the ventral hernia risk score for prediction of surgical site infections

BACKGROUND

Previously, we reported that the Ventral Hernia Risk Score (VHRS) was more accurate in a Veterans Affairs (VA) population in predicting surgical site infection (SSI) after open ventral hernia repair (VHR) compared with other models such as the Ventral Hernia Working Group (VHWG) model. The VHRS was developed using single-center data and stratifies SSI risk into five groups based on concomitant hernia repair, skin flaps created, American Society of Anesthesiologists (ASA) score ≥3, body mass index ≥40 kg/m(2), and incision class 4. The purpose of this study was to validate the VHRS for other hospitals.

METHODS

A prospective database of all open VHRs performed at three institutions from 2009-2011 was utilized. All 436 patients with a follow-up of at least 1 mo were included. The U.S. Centers for Disease Control and Prevention (CDC) definition of SSI was utilized. Each patient was assigned a VHRS, VHWG, and CDC incision classification. Receiver-operating characteristic curves were used to assess predictive accuracy, and the areas under the curve (AUCs) were compared for the three risk-stratification systems.

RESULTS

The median follow-up was 20 mos (range 1-49 mos). During this time, 111 patients (25.5%) developed a SSI. The AUC of the VHRS (0.73; 95% confidence interval [CI] 0.67-0.78) was greater than that of the VHWG (0.66; 95% CI 0.60-0.72; p<0.01) and the CDC incision class (0.68; 95% CI 0.61-0.74; p<0.05).

CONCLUSIONS

The VHRS provides a novel, internally and externally validated score for a patient's likelihood of developing a SSI after open VHR. Elevating skin flaps, ASA score ≥3, concomitant procedures, morbid obesity, and incision class all independently predicted SSI. It remains to be determined if pre-operative patient selection and risk reduction, surgical techniques, and post-operative management can improve outcomes in the highest-risk patients. The VHRS provides a starting point for key stakeholders to discuss the management of ventral hernias.

Diabetes and Risk of Surgical Site Infection: A Systematic Review and Meta-analysis

OBJECTIVE To determine the independent association between diabetes and surgical site infection (SSI) across multiple surgical procedures. DESIGN Systematic review and meta-analysis. METHODS Studies indexed in PubMed published between December 1985 and through July 2015 were identified through the search terms "risk factors" or "glucose" and "surgical site infection." A total of 3,631 abstracts were identified through the initial search terms. Full texts were reviewed for 522 articles. Of these, 94 articles met the criteria for inclusion. Standardized data collection forms were used to extract study-specific estimates for diabetes, blood glucose levels, and body mass index (BMI). A random-effects meta-analysis was used to generate pooled estimates, and meta-regression was used to evaluate specific hypothesized sources of heterogeneity. RESULTS The primary outcome was SSI, as defined by the Centers for Disease Control and Prevention surveillance criteria. The overall effect size for the association between diabetes and SSI was odds ratio (OR)=1.53 (95% predictive interval [PI], 1.11-2.12; I2, 57.2%). SSI class, study design, or patient BMI did not significantly impact study results in a meta-regression model. The association was higher for cardiac surgery 2.03 (95% PI, 1.13-4.05) compared with surgeries of other types (P=.001). CONCLUSIONS These results support the consideration of diabetes as an independent risk factor for SSIs for multiple surgical procedure types. Continued efforts are needed to improve surgical outcomes for diabetic patients. Infect. Control Hosp. Epidemiol. 2015;37(1):88-99.

Current options in umbilical hernia repair in adult patients

Umbilical hernia is a rather common surgical problem. Elective repair after diagnosis is advised. Suture repairs have high recurrence rates; therefore, mesh reinforcement is recommended. Mesh can be placed through either an open or laparoscopic approach with good clinical results. Standard polypropylene mesh is suitable for the open onlay technique; however, composite meshes are required for laparoscopic repairs. Large seromas and surgical site infection are rather common complications that may result in recurrence. Obesity, ascites, and excessive weight gain following repair are obviously potential risk factors. Moreover, smoking may create a risk for recurrence.

Suture versus preperitoneal polypropylene mesh for elective umbilical hernia repairs

BACKGROUND

Repair of primary ventral hernias (PVH) such as umbilical hernias is a common surgical procedure. There is a paucity of risk-adjusted data comparing suture versus mesh repair of these hernias. We compared preperitoneal polypropylene (PP) repair versus suture repair for elective umbilical hernia repair.

METHODS

A retrospective review of all elective open PVH repairs at a single institution from 2000-2010 was performed. Only patients with suture or PP repair of umbilical hernias were included. Univariate analysis was conducted and propensity for treatment-adjusted multivariate logistic regression.

RESULTS

There were 442 elective open PVH repairs performed; 392 met our inclusion criteria. Of these patients, 126 (32.1%) had a PP repair and 266 (67.9%) underwent suture repair. Median (range) follow-up was 60 mo (1-143). Patients who underwent PP repair had more surgical site infections (SSIs; 19.8% versus 7.9%, P < 0.01) and seromas (14.3% versus 4.1%, P < 0.01). There was no difference in recurrence (5.6% versus 7.5%, P = 0.53). On propensity score-adjusted multivariate analysis, we found that body mass index (odds ratio [OR], 1.10) and smoking status (OR, 2.3) were associated with recurrence. Mesh (OR, 2.34) and American Society of Anesthesiologists (OR, 1.95) were associated with SSI. Only mesh (OR, 3.41) was associated with seroma formation.

CONCLUSIONS

Although there was a trend toward more recurrence with suture repair in our study, this was not statistically significant. Mesh repair was associated with more SSI and seromas. Further prospective randomized controlled trial is needed to clarify the role of suture and mesh repair in PVH.

Mesh Or Patch for Hernia on Epigastric and Umbilical Sites (MORPHEUS trial): study protocol for a multi-centre patient blinded randomized controlled trial

Background

Evidence is accumulating that, similar to other ventral hernias, umbilical and epigastric hernias must be mesh repaired. The difficulties involved in mesh placement and in mesh-related complications could be the reason many small abdominal hernias are still primary closed. In laparoscopic repair, a mesh is placed intraperitoneally, while the most common procedure is open surgery is pre-peritoneal mesh placement. A recently developed alternative method is the so-called patch repair, in this approach a mesh can be placed intraperitoneally through open surgery. In theory, such patches are particularly suitable for small hernias due to a reduction in the required dissection. This simple procedure is described in several studies. It is still unclear whether this new approach is associated with an equal risk of recurrence and complications compared with pre-peritoneal meshes. The material of the patch is in direct contact with intra-abdominal organs, it is unknown if this leads to more complications. On the other hand, the smaller dissection in the pre-peritoneal plane may lead to a reduction in wound complications.

Methods/Design

346 patients suffering from an umbilical or epigastric hernia will be included in a multi-centre patient-blinded trial, comparing mesh repair with patch repair. Randomisation will take place for the two operation techniques. The two devices investigated are a flat pre-peritoneal mesh and a Proceed Ventral Patch®. Stratification will occur per centre. Post-operative evaluation will take place after 1, 3, 12 and 24 months. The number of complications requiring treatment is the primary endpoint. Secondary endpoints are Verbal Descriptor Scale (VDS) pain score and VDS cosmetic score, operation duration, recurrence and costs. An intention to treat analysis will be performed.

Discussion

This trial is one of the first in its kind, to compare different mesh devices in a randomized controlled setting. The results will help to evaluate mesh repair for epigastric an umbilical hernia, and find a surgical method that minimizes the complication rate.

Trial registration

Netherlands Trail Registration (NTR) www.trialregister.nl 2010 NTR2514 NL33995.060.10

Complex ventral hernia repair with a human acellular dermal matrix

Purpose

The ideal approach to complex ventral hernia repair is frequently debated. Differences in processing techniques among biologic materials may impact hernia repair outcomes. This study evaluates the outcomes of hernia repair with a terminally sterilized human acellular dermal matrix (TS-HADM) (AlloMax^® Surgical Graft, by C. R. Bard/Davol, Inc., Warwick, RI, USA) treated with low-dose gamma irradiation.

Methods

A single-arm multi-center retrospective observational study of patients undergoing hernia repair with TS-HADM was performed. Data analyses were exploratory only; no formal hypothesis testing was pre-specified.

Results

Seventy-eight patients (43F, 35M) underwent incisional hernia repair with a TS-HADM. Mean follow-up was 20.5 months. Preoperative characteristics include age of 56.6 ± 11.1 years, BMI 36.7 ± 9.9 kg/m², and mean hernia defect size 187 cm². Sixty-five patients underwent component separation technique (CST) with a reinforcing graft. Overall, 21.8 % developed recurrences. Recurrences occurred in 15 % of patients repaired with CST. Major wound complications occurred in 31 % of patients overall. Based upon CDC surgical wound classification, major wound complications were seen in 26, 40, 56, and 50 % of Class 1, 2, 3, and 4 wounds, respectively. No grafts required removal.

Conclusions

Hernia recurrences are not uncommon following complex abdominal wall reconstruction. Improved outcomes are seen when a TS-HADM is utilized as reinforcement to primary fascial closure.

Repair of umbilical and epigastric hernias

Umbilical and epigastric hernias are primary midline defects that are present in up to 50% of the population. In the United States, only about 1% of the population carries this specific diagnosis, and only about 11% of these are repaired. Repair is aimed at symptoms relief or prevention, and the patient's goals and expectations should be explicitly identified and aligned with the health care team. This article details some relevant and interesting anatomic issues, reviews existing data, and highlights some common and important surgical techniques. Emphasis is placed on a patient-centered approach to the repair of umbilical and epigastric hernias.

Development and validation of a risk-stratification score for surgical site occurrence and surgical site infection after open ventral hernia repair

BACKGROUND

Current risk-assessment tools for surgical site occurrence (SSO) and surgical site infection (SSI) are based on expert opinion or are not specific to open ventral hernia repairs. We aimed to develop a risk-assessment tool for SSO and SSI and compare its performance against existing risk-assessment tools in patients with open ventral hernia repair.

STUDY DESIGN

A retrospective study of patients undergoing open ventral hernia repair (n = 888) was conducted at a single institution from 2000 through 2010. Rates of SSO and SSI were determined by chart review. Stepwise regression models were built to identify predictors of SSO and SSI and internally validated using bootstrapping. Odds ratios were converted to a point system and summed to create the Ventral Hernia Risk Score (VHRS) for SSO and SSI, respectively. Area under the receiver operating characteristic curve was used to compare the accuracy of the VHRS models against the National Nosocomial Infection Surveillance Risk Index, Ventral Hernia Working Group (VHWG) grade, and VHWG score.

RESULTS

The rates of SSO and SSI were 33% and 22%, respectively. Factors associated with SSO included mesh implant, concomitant hernia repair, dissection of skin flaps, and wound class 4. Predictors of SSI included concomitant repair, dissection of skin flaps, American Society of Anesthesiologists class ≥ 3, wound class 4, and body mass index ≥ 40. The accuracy of the VHRS in predicting SSO and SSI exceeded National Nosocomial Infection Surveillance and VHWG grade, but was not better than VHWG score.

CONCLUSIONS

The VHRS identified patients at increased risk for SSO/SSI more accurately than the National Nosocomial Infection Surveillance scores and VHWG grade, and can be used to guide clinical decisions and patient counseling.

Chronic complaints after simple sutured repair for umbilical or epigastric hernias may be related to recurrence

PURPOSE

Umbilical and epigastric hernia repairs are minor, but are commonly conducted surgical procedures. Long-term results have only been sparsely investigated. Our objective was to investigate the risk of chronic complaints after a simple sutured repair for small umbilical and epigastric hernias.

METHODS

A retrospective cohort study with a 5-year questionnaire and clinical follow-up was conducted. Patients undergoing primary elective, open non-mesh umbilical or epigastric sutured hernia repair were included. Patients completed a structured questionnaire regarding chronic complaints during work and leisure activities using a verbal rating scale. The primary outcome was chronic complaints.

RESULTS

A total of 295 patients were included for analysis after a median of 5.0-year (range 2.8-8.0) follow-up period. Follow-up results were achieved from 262 of the included patients (90 % response rate). Up till 5.8 % of the patients reported moderate or severe pain and discomfort. Work and leisure activities were restricted in 8.5 and 10.0 % of patients, respectively. Patients with chronic complaints had a higher incidence of recurrence (clinical and reoperation), than patients with none or mild complaints (78.6 vs. 22.2 % (P < 0.001)). The recurrence rate was significantly higher after a repair with absorbable suture (20.1 %) compared with non-absorbable suture repair (4.2 %) (P < 0.001).

CONCLUSION

We found that chronic complaints after a simple sutured umbilical or epigastric repair was in the level of 5.5 % and could in part be explained by recurrence. Furthermore, absorbable suture should be omitted to reduce risk of recurrence.

Umbilical hernia management during liver transplantation

PURPOSE

Patients with liver cirrhosis scheduled for liver transplantation often present with a concurrent umbilical hernia. Optimal management of these patients is not clear. The objective of this study was to compare the outcomes of patients who underwent umbilical hernia correction during liver transplantation through a separate infra-umbilical incision with those who underwent correction through the same incision used to perform the liver transplantation.

METHODS

In the period between 1990 and 2011, all 27 patients with umbilical hernia and liver cirrhosis who underwent hernia correction during liver transplantation were identified in our hospital database. In 17 cases, umbilical hernia repair was performed through a separate infra-umbilical incision (separate incision group) and 10 were corrected from within the abdominal cavity without a separate incision (same incision group). Six patients died during follow-up; no deaths were attributable to intraoperative umbilical hernia repair. All 21 patients who were alive visited the outpatient clinic to detect recurrent umbilical hernia.

RESULTS

One recurrent umbilical hernia was diagnosed in the separate incision group (6 %) and four (40 %) in the same incision group (p = 0.047). Two patients in the same incision group required repair of the recurrent umbilical hernia; one of whom underwent emergency surgery for bowel incarceration. The one recurrent hernia in the separate incision group was corrected electively.

CONCLUSION

In the event of liver transplantation, umbilical hernia repair through a separate infra-umbilical incision is preferred over correction through the same incision used to perform the transplantation.

A Collective Review on Mesh-Based Repair of Umbilical and Epigastric Hernias

In accordance with the tension-free principles for other hernias, umbilical and epigastric hernia repair should probably be mesh-based. The number of randomized studies is increasing, most of them showing significantly less recurrences with the use of a mesh. Different devices are available and are applicable by several approaches. The objective of this review was to evaluate recent literature for the different types of mesh for umbilical and epigastric hernia repair and recurrences after mesh repair. A multi-database search was conducted to reveal relevant studies since 2001 reporting mesh-based repair of primary umbilical/epigastric hernia and their outcomes in adult patients. A total of 20 studies were included, 15 of them solely involved umbilical hernias, whereas the remaining studies included epigastric hernias as well. A median of 124 patients (range, 17-384) was investigated per study. Three quarters of the included studies had a follow-up of at least 2 years. Six studies described the results of laparoscopic approach, of which one reported a recurrence rate of 2.7 %; in the remaining studies, no recurrences occurred. Two comparative studies reported a lower incidence of complications and postoperative pain after laparoscopic repair compared to open repair. Seventeen studies reported results of open techniques, of which seven studies showed no recurrence. Other studies reported recurrence rates up to 3.1 %. A wide range of complication rates were reported (0-33 %). This collective review showed acceptable recurrence rates for mesh-based umbilical and epigastric hernia repair. A wide range of devices was investigated. A tendency toward more complications after laparoscopic repair was found compared to open repair.

History of methicillin-resistant Staphylococcus aureus (MRSA) surgical site infection may not be a contraindication to ventral hernia repair with synthetic mesh: a preliminary report

PURPOSE

A history of methicillin-resistant Staphylococcus aureus (MRSA) surgical site infection presents a significant surgical dilemma as to the risk of subsequent mesh infection, even if no active infection is present. We investigated the outcomes of ventral hernia repair with synthetic mesh in patients with prior MRSA surgical site infections (SSIs).

METHODS

All patients with a clean wound but prior MRSA SSI undergoing open ventral hernia repair with mesh by a single surgeon over a 3-year period were reviewed for the development of any major (need for readmission, operative debridement, or mesh removal) or minor SSI. All patients received peri-operative intravenous vancomycin and prolonged suppressive oral trimethoprim/sulfamethoxazole or doxycycline.

RESULTS

Ten patients (male = 7, female = 3) with clean wounds and a history of MRSA SSI underwent open ventral hernia repair with retrorectus synthetic mesh placement. Mean follow-up was 13.5 ± 3.3 months. Overall, two patients (20 %) developed SSIs (minor = 2, major = 0). Both SSIs were successfully managed with therapeutic oral antibiotics and local wound care without need for surgical debridement or mesh removal. There have been no hernia recurrences in any of the patients.

CONCLUSIONS

Preliminary results suggest that history of MRSA infection may not be a contraindication to the use of synthetic mesh for ventral hernia repair. Macroporous lightweight meshes, combined with use of prolonged suppressive antibiotics and sublay retromuscular mesh placement that provides complete tissue coverage, should be further investigated as an acceptable prosthetic choice when planning a complex ventral hernia repair in the setting of prior MRSA SSI.

Long-term follow-up after elective adult umbilical hernia repair: low recurrence rates also after non-mesh repairs

PURPOSE

The purpose of this study was to establish long-term outcome after elective adult umbilical hernia (AUH) repair.

METHODS

Peri- and postoperative data considering all consecutive procedures at our institution during the time span from 1999 to 2009 were retrospectively gathered and followed by a questionnaire and, if needed, a clinical investigation in early 2011.

RESULTS

A total of 162 patients (female/male 35 %/65 %) were operated, and 144/162 (89 %) answers were gathered, mean follow-up time 70 months; 77 % were sutured, non-mesh repairs; 94 % of all AUHs were smaller than 3 cm; and 49 % of the operations were performed under local anaesthesia. No perioperative complications were encountered. Five postoperative complications were encountered, two serious, both after mesh-based repairs. Wound infection rate (SSI) was low, 2/144 (1.4 %). 7/144 (4.9 %) recurrences were registered, none if mesh-based techniques were used, giving a recurrence rate of 6.3 % in suture-based repairs, the difference, however, not statistically significant (p = 0.141); 2 % reported persistent pain at follow-up, 89 % were overall satisfied with the outcome.

CONCLUSIONS

AUH repair could be performed with low early and long-term complication rates, with low recurrence rates also after non-mesh repairs. A substantial cohort of patients will unnecessary be implanted with meshes if mesh-reinforced repairs should be used on a routine basis, that is, 16 surplus meshes to prevent one recurrence in the present study. We recommend a tailored approach to AUH repair: suture-based methods with defects smaller than 2 cm and mesh-based repairs considered if larger than that.

Laparoscopic ventral hernia repair: primary versus secondary hernias

BACKGROUND

Most studies regarding laparoscopic ventral hernia repair (LVHR) have merged primary hernias (PHs) and secondary (incisional) hernias (SHs) into one group of ventral hernias. This grouping could produce falsely favorable results for LVHR. Our objective was to review and compare the outcomes of laparoscopic repair of PHs and SHs.

METHODS

A retrospective chart review of patients from 2000 to 2010 identified the cases of LVHR at two affiliated institutions. The demographics, comorbidities, type of hernia (PH versus SH), and short- and long-term complications were analyzed. The postoperative pain, cosmetic satisfaction, and Activities Assessment Scale scores were assessed by telephone survey.

RESULTS

A total of 201 cases of LVHR were identified: 73 PHs (36%) and 128 SHs (64%). No difference was found in the mean age between the two groups. The PH group had a greater percentage of black patients (34% versus 14%; P < 0.05), and the SH group had a greater percentage of white patients (85% versus 65%; P < 0.05). More female patients had SHs (34% versus 14%; P < 0.05), and more male patients had PHs (86% versus 66%; P < 0.05). More patients in the SH group had chronic obstructive pulmonary disease (19% versus 7%; P < 0.05) and prostate disease (32% versus 9%; P < 0.05). Overall, the SHs were larger (37.9 ± 4.9 cm(2)versus 11.5 ± 1.9 cm(2); P < 0.01). No differences were found in early postoperative complications, including pneumonia, urinary tract infection, surgical site infection, and seromas between the two groups. However, those with SHs had a greater incidence of recurrence (16% versus 5%; P < 0.05) and mesh explantation (7% versus 0%; P < 0.05). The patients who also underwent SH repairs had greater postoperative pain scores when followed up for a median of 25 mo than those who underwent PH repairs when followed up for a median of 24 mo (3.5 ± 0.4 versus 1.8 ± 0.4; P < 0.05). More patients in the SH group had chronic pain issues (26% versus 5%; P = 0.0003) and had lower satisfaction scores (7.5 ± 0.3 versus 8.6 ± 0.3; P < 0.05). Overall, the Activities Assessment Scale scores were not significantly different.

CONCLUSIONS

Our data have demonstrated that PHs and SHs are different. LVHR of SHs is associated with increased recurrence, greater postoperative pain scores, chronic pain issues, and lower patient satisfaction scores. We recommend that future studies evaluate LVHR for PHs separate from those for SHs.

Is degradable antibiotic coating for synthetic meshes provide protection against experimental animal infection after fascia repair?

The surgical repair of pelvic organ prolapse using synthetic mesh can fail because of slow or partial implant integration due to poor biocompatibility or infection. As systemic antibiotic prophylaxis has only limited success, we have developed a system that coats standard polypropylene mesh with clinically relevant antibiotics. Amoxicillin and ofloxacin are both released from the mesh in vitro at high levels over 3 days, preventing adhesion and biofilm formation by a clinical isolate of E. coli. In an in vivo incisional hernia repair model in rats, the antibiotic-coated mesh results in appropriate tissue integration with adequate vascularization and collagen formation. When implanted animals are infected with virulent E. coli, both antibiotic coatings provide full protection against infection (as assessed both clinically and microbiologically), thus demonstrating their bioavailability. This method is a specific approach for producing a therapeutic coating that could reduce postsurgical infections.

Fifty-three-year experience with pediatric umbilical hernia repairs

PURPOSE

The aim of this study was to evaluate the long-term surgical and patient-reported outcomes of pediatric umbilical hernia (UH) repairs.

METHODS

A retrospective review of all children (<18 years old) who underwent UH repair at Mayo Clinic-Rochester in the last half century was done. Follow-up was obtained by mailed survey.

RESULTS

From 1956 to 2009, 489 children (boys, 251; girls, 238) underwent a primary UH repair. The mean age was 3.9 years (range, 0.01-17.8 years). Complicated UHs that required emergent repair (n = 34, or 7%) included recurrent incarceration (22), enteric fistula (7), strangulation (4), and evisceration (1). Mean UH size was 1.3 cm (range, 0.2-7.0 cm), varying by operative indication (1.0 cm emergent vs 1.5 cm elective repairs, P = .008) and decade of repair (2.2 cm, 1950s-60s vs 1.3 cm, 1990s-2000s; P = .001). Postoperative morbidity (2%) consisted of superficial wound infection (7), hematoma (3), and seroma (1). With a 66% survey response rate and mean follow-up of 13.0 years (range, 0-53.8 years), 8 (2%) patients experienced a recurrence. Most patients reported satisfaction (90%) with the cosmetic appearance of their umbilicus and are pain free (96%).

CONCLUSION

Pediatric UH repairs have low morbidity and recurrence rates. Most patients are satisfied and pain free. Importantly, complicated UHs were more likely to be associated with smaller defects; therefore, parental counseling for signs of incarceration is recommended even in small defects.

Antibacterial mesh: a novel technique involving naturally occurring cellular proteins

BACKGROUND

Naturally occurring antimicrobial peptides are possibly the "next frontier" in infection prevention. Binding them to mesh could reduce the rate of mesh infections. This study identifies an antimicrobial agent capable of significant antibacterial activity when bound to mesh.

METHODS

Lysozyme, human beta defensin (HBD-3), human cathelicidin (LL-37), and lysostaphin were adsorbed to polypropylene mesh at various concentrations. Treated meshes were placed in a suspension of 1 × 10(6) Staphylococcus aureus. Antibacterial action was monitored by turbidimetric assay, fluorescent imaging, and a colony counting method.

RESULTS

A very high rate of lysis of S aureus cells was observed in the lysostaphin-treated group as measured by optical density; none survived as seen on colony count assays. Optical density for mesh coated with lysozyme, HBD-3, and LL-37 did not differ from untreated controls, with 100% survival rates by colony counts.

CONCLUSION

Lysostaphin had superior antibacterial activity following adsorption to mesh.

Umbilical Herniorrhaphy Reinforced with Biologic Mesh

The true recurrence rate after umbilical hernia repair in not known. After simple closure, the reported rate of recurrence in the literature is as high as 54 per cent. With synthetic mesh repair, the recurrence rates are lowered to less than 10 per cent. However, synthetic mesh is associated with complications such as enterocutaneous fistula and mesh infections. This preliminary study looks at the safety and effectiveness of biologic extracellular matrix mesh reinforcement in the repair of umbilical hernias. We retrospectively reviewed all patients who underwent repair of an umbilical hernia defect (2-3 cm) with primary approximation of the margins and reinforced using a biologic mesh placed beneath the umbilical fascia from 2007 to 2009. Demographic data were collected. Patients were followed prospectively at 2 weeks, 8 weeks, 6 months, and 1 year. Data were reviewed for postoperative complications, hernia recurrence, and patient satisfaction. During the study period, 16 patients completed the 1 year follow-up. There were 10 men and six women. Ages ranged from 28 to 75 years with a mean age of 47.6 years. The hernias were 2 to 3 cm in size. Complications were minimal. Overall patient satisfaction with the procedure was high. There were no mesh infections. During a mean follow-up of 12 months, only one patient had recurrent hernia (6%). This preliminary evaluation shows promise for an alternative treatment of umbilical hernias using biologic extracellular matrix mesh added as an underlay to reinforce a primary closure. The biologic mesh has a low incidence of infection and complications and results in high patient satisfaction. This preliminary study begs for a randomized, prospective evaluation with long-term follow-up.

Does mesh offer an advantage over tissue in the open repair of umbilical hernias? A systematic review and meta-analysis

PURPOSE

To determine the best surgical approach for the open repair of primary umbilical hernias.

METHODS

Studies were identified through searching MEDLINE, EMBASE, and the Cochrane database, as well as hand-searching references. Randomized controlled trials (RCTs) and observational studies comparing mesh to suture repair for primary umbilical hernias published between January 1965 and October 2009 were included. Data regarding the recurrence rate, complications, number of subjects, length of follow-up, size of hernia, and type of mesh were extracted. Log odds ratios were calculated and weighed by the Mantel-Haenszel method to obtain a pooled estimate with 95% confidence interval (CI). A fixed effects model was used.

RESULTS

Three RCTs and ten observational studies were identified. The pooled odds ratio (OR) for RCTs was 0.09 in favor of mesh (95% CI 0.02-0.39). The pooled OR for observational studies was 0.40 in favor of mesh (95% CI 0.21-0.75). There was no difference in complication rates between mesh and tissue repair in RCTs or observational studies.

CONCLUSIONS

The use of mesh in umbilical hernia repair results in decreased recurrence and similar wound complications rates compared to tissue repair for primary umbilical hernias.

Infection Risk of Open Placement of Intraperitoneal Composite Mesh

Mesh contamination is the most feared postoperative complication after ventral herniorrhaphy. The morbidity is significant requiring additional operative procedures for debridement or complete removal of the prosthesis. From July 1998 to December 2007, a retrospective review was performed to evaluate the incidence of mesh infection in patients undergoing an elective, open intra-abdominal sublay technique of repair using a composite mesh of polypropylene and expanded polytetrafluoroethylene (Composix®, Davol®, Inc., Cranston, RI). There were 206 procedures involving open, intraperitoneal placement of Composix® mesh resulting in 21 mesh infections (10.2%). The majority of infections were secondary to Staphylococcus aureus contamination (76%), and over half were infected with MRSA. All patients, except two, required mesh removal. Reoperation for repair of the recurrent defect after mesh removal was necessary in 67 per cent. Two patients with MRSA infection subsequently reinfected their recurrent repair. Overall, the infected group required 44 additional procedures (mean of 2.1 procedures/patient). The infection risk was reduced with the lighter density, newer generation composite mesh (7.3% vs 14.5%). Mesh infection after ventral herniorrhaphy conveys significant morbidity. An open intraabdominal underlay of a composite mesh of polypropylene and ePTFE carries a real risk of contamination and should be reconsidered.

Management of complicated umbilical hernias in cirrhotic patients using permanent mesh: randomized clinical trial

PURPOSE

The optimal management of complicated umbilical hernia in patients with liver cirrhosis is still undefined. The purpose of this study is to evaluate the use of polypropylene mesh to treat complicated umbilical hernia in cirrhotic patients.

METHODS

In the period from January 2005 to May 2008, 80 patients with complicated umbilical hernia combined with liver cirrhosis underwent hernia repair. The patients were randomly divided into two groups; each group consisted of 40 patients. Hernia repair was carried out by conventional fascial repair in group I and by mesh hernioplasty in group II.

RESULTS

The male/female ratio, Child-Pugh class, and mode of hernia complication were almost matched in both groups. Hernia recurrence was significantly less in the mesh hernioplasty group. No mesh exposure or fistulae were experienced. There was no need to remove any of the meshes.

CONCLUSIONS

Permanent mesh can be used in complicated hernias in cirrhotic patients with minimal wound-related morbidity and a significantly lower rate of recurrence.