Perceptions and understanding about mesh and hernia surgery: What do patients really think?

Next generation meshes for hernia repair: Polypropylene meshes coated with antimicrobial benzalkonium chloride induced proliferative activity of fibroblasts

Hernia repair is one of the most frequently performed world-wide surgical procedures in which hernia meshes are becoming increasingly used. Polypropylene (PP) mesh implants reduce the risk of recurrence and post-operative pain, although many other risks are associated with it, such as bacterial infection. In this study we developed PP meshes coated with the well-known antimicrobial compound, benzalkonium chloride (BAK) by dip-coating. Several dilutions (40, 20, 30, 10, 7.5, 5, 2.5, 1, 0.5, 0.1 and 0.05 % v/v) of commercial BAK solution (BAK diluted in 70 % ethyl alcohol at 0.1 % w/v) were used to produce antimicrobial meshes with different amounts of BAK. The dip-coating treatment with low concentrations of BAK (1, 0.5, 0.1 and 0.05 % v/v dilutions) was found to have biocompatible results in fibroblast. The use of 0.1 and 0.05 % v/v dilutions (PP meshes with up to ∼2 % w/w of BAK) showed proliferative activity on fibroblast cells, indicating that these novel antimicrobial meshes show great promise for hernia repair due to their ability to prevent infections while inducing fibroblast proliferation.

Slowly absorbable mesh in sublay ventral hernia repair in contaminated fields

BACKGROUND

In the past years, there has been increasing evidence that supports the use of permanent mesh in contaminated wounds. Given this increased evidence, the indications to opt for slowly absorbable "biosynthetic" prostheses have been questioned. To address this, we compared the outcomes of slowly absorbable mesh in contaminated cases in a well-matched multicentric cohort.

METHODS

The Abdominal Core Health Quality Collaborative (ACHQC) database was queried for patients undergoing elective ventral hernia repair in Centers for Disease Control (CDC)-III operations (2013-2022). We compared demographics, hernia characteristics, and postoperative outcomes among types of mesh. We used propensity score matching to adjust for sex, diabetes, body mass index, smoking status, and operative time between mesh groups. Patients within other CDC classes and those with mesh positioned elsewhere than retro-rectus/preperitoneal space were excluded.

RESULTS

A total of 760 patients were included in the analysis. Slowly absorbable synthetic mesh (SA) was utilized in only 7% of the cases, while permanent (P) and biologic (B) mesh in 77% and 16%, respectively. After matching, 255 patients were studied. There was no difference in surgical site occurrence (8% SA, 16% P, 10% B, p = 0.27), surgical site infection (20% SA, 17% P, 12% B p = 0.54), surgical site occurrence requiring intervention (18% SA, 13% P, 14% B p = 0.72), readmission (12% SA, 14% P, 12% B, p = 0.90), or reoperation (8% SA, 2% P, 4% B, p = 0.14) at 30 days. In patients with 1-year follow-up, there was no difference in recurrence among groups (20% SA, 26% P, 24% B p = 0.90).

CONCLUSION

Based on our findings, SA has comparable outcomes to other types of mesh, particularly when an optimal retro-rectus repair is performed.

Comparison of mechanical properties and host tissue response to OviTex™ and Strattice™ surgical meshes

PURPOSE

This study compared the in vitro/benchtop and in vivo mechanical properties and host biologic response to ovine rumen-derived/polymer mesh hybrid OviTex™ with porcine-derived acellular dermal matrix Strattice™ Firm.

METHODS

OviTex 2S Resorbable (OviTex 2S-R) and Strattice morphology were examined in vitro using histology and scanning electron microscopy; mechanical properties were assessed via tensile test; in vivo host biologic response and explant mechanics were evaluated in a rodent subcutaneous model. Separately, OviTex 1S Permanent (OviTex 1S-P) and Strattice were evaluated in a primate abdominal wall repair model.

RESULTS

OviTex 2S-R demonstrated layer separation, whereas Strattice retained its structural integrity and demonstrated higher maximum load than OviTex 2S-R out-of-package (124.8 ± 11.1 N/cm vs 37.9 ± 5.5 N/cm, p < 0.001), 24 h (55.7 ± 7.4 N/cm vs 5.6 ± 3.8 N/cm, p < 0.001), 48 h (45.3 ± 14.8 N/cm vs 2.8 ± 2.6 N/cm, p = 0.003), and 72 h (29.2 ± 10.5 N/cm vs 3.2 ± 3.1 N/cm, p = 0.006) following collagenase digestion. In rodents, inflammatory cell infiltration was observed between OviTex 2S-R layers, while Strattice induced a minimal inflammatory response. Strattice retained higher maximum load at 3 (46.3 ± 27.4 N/cm vs 9.5 ± 3.2 N/cm, p = 0.041) and 6 weeks (28.6 ± 14.1 N/cm vs 7.0 ± 3.0 N/cm, p = 0.029). In primates, OviTex 1S-P exhibited loss of composite mesh integrity whereas Strattice integrated into host tissue with minimal inflammation and retained higher maximum load at 1 month than OviTex 1S-P (66.8 ± 43.4 N/cm vs 9.6 ± 4.4 N/cm; p = 0.151).

CONCLUSIONS

Strattice retained greater mechanical strength as shown by lower susceptibility to collagenase degradation than OviTex 2S-R in vitro, as well as higher maximum load and improved host biologic response than OviTex 2S-R in rodents and OviTex 1S-P in primates.

Mesh versus non-mesh repair of groin hernias: a rapid review

BACKGROUND

Mesh is frequently utilized intraoperatively for the repair of groin hernias. However, patients may request non-mesh hernia repairs owing to adverse events reported in other mesh procedures. To inform surgical safety, this study aimed to compare postoperative complications between mesh and non-mesh groin hernia repairs and identify other operative and patient-related risk factors associated with poor postoperative outcomes.

METHODS

Ovid MEDLINE and grey literature were searched to 9 June 2021 for studies comparing mesh to non-mesh techniques for primary groin hernia repair. Outcomes of interest were postoperative complications, recurrence of hernia, pain and risk factors associated with poorer surgical outcomes. Methodological quality was appraised using the AMSTAR 2 tool.

RESULTS

The systematic search returned 4268 results, which included seven systematic reviews and five registry analyses. Mesh repair techniques resulted in lower hernia recurrence rates, with no difference in chronic pain, seroma, haematoma or wound infection, compared to non-mesh techniques. Risk factors associated with increased risk of hernia recurrence were increased body mass index (BMI), positive smoking status and direct hernia. These were independent of surgical technique. Patients under 40 years of age were at increased risk of postoperative pain.

CONCLUSIONS

Surgical repair of primary groin hernias using mesh achieves lower recurrence rates, with no difference in safety outcomes, compared with non-mesh repairs. Additional risk factors associated with increased recurrence include increased BMI, history of smoking and hernia subtype.

Academic and community hernia center websites in the United States fail to meet healthcare literacy standards of readability

BACKGROUND

Health literacy is considered the single best predictor of health status. Organizations including the American Medical Association (AMA) and the National Institutes of Health (NIH) have recommended that the readability of patient education materials not exceed the sixth-grade level. Our study focuses on the readability of self-designated hernia centers websites at both academic and community organizations across the United States to determine their ability to dispense patient information at an appropriate reading level.

METHODS

A search was conducted utilizing the Google search engine. The key words "Hernia Center" and "University Hernia Center" were used to identify links to surgical programs within the United States. The following readability tests were conducted via the program: Flesch-Kincaid Grade Level (FKGL), Gunning Fox Index (GFI), Coleman-Liau Index (CLI), Simple Measure of Gobbledygook (SMOG), and Flesch Reading Ease (FRE) score.

RESULTS

Of 96 websites, zero (0%) had fulfilled the recommended reading level in all four tests. The mean test scores for all non-academic centers (n = 50) were as follows: FKGL (11.14 ± 2.68), GFI (14.39 ± 3.07), CLI (9.29 ± 2.48) and SMOG (13.38 ± 2.03). The mean test scores [SK1] for all academic programs (n = 46) were as follows: FKGL (11.7 ± 2.66), GFI (15.01 ± 2.99), CLI (9.34 ± 1.91) and SMOG (13.71 ± 2.02). A one-sample t test was performed to compare the FKGL, GFI, CLI, and SMOG scores for each hernia center to a value of 6.9 (6.9 or less is considered an acceptable reading level) and a p value of 0.001 for all four tests were noted demonstrating statistical significance. The Academic and Community readability scores for both groups were compared to each other with a two-sample t test with a p value of > 0.05 for all four tests and there were no statistically significant differences.

CONCLUSION

Neither Academic nor Community hernia centers met the appropriate reading level of sixth-grade or less. Steps moving forward to improve patient comprehension and/or involving with their care should include appropriate reading level material, identification of a patient with a low literacy level with intervention or additional counseling when appropriate, and the addition of adjunct learning materials such as videos.

Internet search by the patients undergoing hernia surgery about the disease and surgeon selection

AIM

To find out the current status of the internet use of patients who undergo surgery for repair of their hernias.

MATERIALS AND METHODS

The patients who were diagnosed with abdominal wall hernia and scheduled for elective hernia repair were requested to answer a questionnaire. The questions were directed face-to-face by the surgeons themselves. The age, gender, education status, American Society of Anesthesiologists (ASA) physical status, place of living, health insurance, access to the Internet, surgical method, the person who did the search, previous hernia surgery, recurrence of previous hernia surgery, surgery other than hernia, and the hernia type were the recorded parameters at the first stage. Then, the answers for three main questions were taken: "Did you make a search about your hernia?", "Did you make a search about your surgeon?", "Would you prefer another surgeon if you could?"

RESULTS

A total of 200 patients were included in the study (146 male/54 female). 55.5% of the patients made an Internet search about their hernias. 58.5% of the patients made a search to find a proper surgeon. 12.5% of the patients stated that they would like to go to another surgeon for the hernia repair if it was possible. Internet search rate was significantly higher in younger patients in comparison with older patients. The higher the education level of the patients, the higher the rate of making Internet searches about the hernias and surgeons. Patients who live in the cities more frequently made Internet searches in comparison with those living in towns or villages. Internet searches about the hernias were similar in patients who had a history of hernia surgery (n = 23, 52%), and were even operated for recurrence of the same hernia (n = 30, 60%), compared to other patients (p = 0.569). Similarly, the rates of conducting surgeon research of the patients in these two groups (66.7%, 56.5%, respectively) were statistically similar (p = 0.450). The effect of ASA classification of patients on the Internet researches conducted about the disease and about the surgeons was not statistically significant (p = 0.799, p = 0.388, respectively). It was found that the rates of researching about the disease and about the surgeon on the Internet were significantly higher in patients who had undergone a minimally invasive surgery (p < 0.001, p < 0.001, respectively).

CONCLUSIONS

Less than two-thirds of the hernia patients make Internet search about their disease. Higher education level, younger age, patient's preference for minimally invasive surgery and living in a city positively affect Internet search rates.