Do postoperative complications correlate to chronic pain following inguinal hernia repair? A prospective cohort study from the Swedish Hernia Register

Matching males and females undergoing non mesh primary unilateral inguinal hernia repair: evaluating sex differences in preoperative and acute postoperative pain

PURPOSE

The objective was to compare pain and related psychological factors during the preoperative and acute postoperative period between male and female patients, who underwent non mesh primary unilateral inguinal hernia repair.

METHODS

After ethics approval, informed consent was obtained, and data were collected. Male and female participants were compared by manually matching one-to-one on 10 variables. Descriptive statistics (mean ± standard deviation and frequency) as well as numerical rating scales from 0 to 10 were used. Comparison tests were performed using Chi-square or Fisher's Exact test for categorical data and independent samples t-test or non-parametric equivalent tests for numerical scores. p < 0.05 is reported as statistically significant. To control type I error, Bonferroni correction was used.

RESULTS

72 participants with 36 matched pairs were included. Sex differences were found for operation length (p = .006), side of operation (p = .002), and hernia type (p = .013). Significant differences between the sexes were not found at the preoperative or postoperative time for resilience, pain interference or pain severity related measures, postoperative hernia pain incidence, pain catastrophizing, depression and anxiety symptoms, or return to normal activities.

CONCLUSION

When controlling for known confounders and using a conservative Type I error rate, pain and related factors between the sexes did not differ significantly.

Comparison of postoperative outcomes between tissue glue and suture for mesh fixation in open tension-free inguinal hernia repair: a prospective analytical study

Introduction

A hernia is an abnormal protrusion of the viscus through the normal or abnormal opening of its containing cavity. Lichtenstein tension-free mesh repair is a commonly performed surgery for hernia. Various studies have revealed atraumatic fixation of the mesh produces less pain without compromising the outcomes.

Methods

This is a prospective analytical study conducted in a tertiary hospital over a year. Eighty patients with primary inguinal hernia undergoing open mesh repair were enrolled and divided into two groups with 40 patients in each group. Mesh fixation was done with N-butyl 2 cyano-acrylate glue in one group, while polypropylene 2-0 suture in the other group. Postoperative pain, the number of dosages of analgesia required, the incidence of hematoma/seroma formation, surgical site infection, and length of hospital stay were compared between the two groups. Data were analyzed using SPSS 25.

Results

Visual analog scores were significantly reduced in the glue group at 12 h and 24 h (P<0.05) with a reduction of the mean number of analgesic doses from 6.42±0.984 in the suture group to 5.95±0.597 in the glue group (P<0.05). The operating time was significantly reduced from 70.03±4.376 minutes in the suture group to 58.43±4.540 min in the glue group (P<0.05), while there was no significant difference in the length of hospital stay. Five percent of cases in the suture group developed seroma while no SSI was reported in this study.

Conclusions

This study demonstrates mesh fixation with cyanoacrylate glue in open hernioplasty for primary groin hernias is associated with reduced immediate postoperative pain, dose of analgesia required, and operating time in comparison to fixation with suture.

Perioperative Risk Factors for Persistent Postsurgical Pain After Inguinal Hernia Repair: Systematic Review and Meta-Analysis

Persistent postsurgical pain (PPSP) is one of the most bothersome and disabling long-term complications after inguinal hernia repair surgery. Understanding perioperative risk factors that contribute to PPSP can help identify high-risk patients and develop risk-mitigation approaches. The objective of this study was to systematically review and meta-analyze risk factors that contribute to PPSP after inguinal hernia repair. The literature search resulted in 303 papers included in this review, 140 of which were used for meta-analyses. Our results suggest that younger age, female sex, preoperative pain, recurrent hernia, postoperative complications, and postoperative pain are associated with a higher risk of PPSP. Laparoscopic techniques reduce the PPSP occurrence compared to anterior techniques such as Lichtenstein repair, and tissue-suture techniques such as Shouldice repair. The use of fibrin glue for mesh fixation was consistently associated with lower PPSP rates compared to tacks, staples, and sutures. Considerable variability was observed with PPSP assessment and reporting methodology in terms of study design, follow-up timing, clarity of pain definition, as well as pain intensity or interference threshold. High or moderate risk of bias in at least one domain was noted in >75% of studies. These may limit the generalizability of our results. Future studies should assess and report comprehensive preoperative and perioperative risk factors for PPSP adjusted for confounding factors, and develop risk-prediction models to drive stratified PPSP-mitigation trials and personalized clinical decision-making. PERSPECTIVE: This systematic review and meta-analysis summarizes the current evidence on risk factors for persistent pain after inguinal hernia repair. The findings can help identify patients at risk and test personalized risk-mitigation approaches to prevent pain. PROSPERO REGISTRATION: htttps://www.crd.york.ac.uk/prospero/display_record.php?RecordID=154663.

pH-Responsive antibacterial metal-phenolic network coating on hernia meshes

Polypropylene (PP) mesh is widely used in hernioplasty, but it is prone to contamination by pathogenic bacteria. Here, we present an infection microenvironment-responsive metal-phenolic network (MPN) coating, which is made up of Cu2+ and tannic acid (TA) (referred to as CT coating), and is fabricated on PP meshes by layer-by-layer (LbL) assembly. The CT coating provided a robust protection for the PP mesh from pathogenic bacterial infection in a pH-responsive manner due to the pH-responsive disassembly kinetics of MPN complexes. Moreover, the PP meshes with ten CT coating cycles (PP-CT(10)) exhibited excellent stability in a physiological environment, with the killing ratio against "superbug" methicillin-resistant Staphylococcus aureus (MRSA) at pH 5.5 exceeding 99% even after 28 days of PBS (pH 7.4) immersion. In addition, the PP-CT(10) exhibited excellent in vivo anti-infective ability in a rodent subcutaneous implant MRSA infection model, and the results of histological and immunohistochemical analyses demonstrated that the reduced bacterial number alleviated the inflammatory response at implant sites. This study revealed that MPN coating is a promising strategy, which could provide a self-defensive ability for various implants to combat post-surgical infections in a pH-responsive manner.

Clinical application of the dissection of the preperitoneal space without electrocoagulation in laparoscopic transperitoneal inguinal hernia repair throughout of the whole process

Introduction

The dissection of the preperitoneal space is performed using a monopolar instrument to prevent bleeding in laparoscopic transabdominal preperitoneal hernia repair (TAPP). It may also cause energy injuries and nerve damage.

Aim

To assess the effectiveness and safety of dissection of the preperitoneal space without electrocoagulation (DPSWE) in TAPP throughout the process.

Material and methods

A retrospective analysis of data of 134 patients was made. The electrocoagulation group (EG) relied on monopolar instruments. In the non-electrocoagulation group (NEG) mainly scissors were used without electrocoagulation. The patients were followed for up for 3 months. Intraoperative and postoperative conditions and other complications were observed.

Results

The VAS scores in the NEG were lower than those in the EG (p < 0.05). The operation time in the NEG was shorter than that in the EG (p < 0.05). Hospitalization expenses, scrotal seroma formation, and rupture of hernia sac in the NEG were lower than those in the EG (p < 0.05). The intraoperative bleeding volume above 20 ml in the NEG was higher than that in the EG. There was no significant difference in the incidence of postoperative bleeding, vas deferens injury, intestinal injury, surgical site infection, length of hospital stay, urinary retention and hernia recurrence in the NEG and the EG (p > 0.05). There was no significant difference in the incidence of surgical site infections (SSIs) in the NEG and the EG.

Conclusions

DPSWE is effective and safe. DPSWE may reduce postoperative pain and have no significant increase in postoperative bleeding.

Practical Mouse Model to Investigate Therapeutics for Staphylococcusaureus Contaminated Surgical Mesh Implants

INTRODUCTION

The use of prosthetic mesh in hernia repair provides a powerful tool to increase repair longevity, decrease recurrence rates, and facilitate complex abdominal wall reconstruction. Overall infection rates with mesh are low, but for those affected there is high morbidity and economic cost. The availability of a practicable small animal model would be advantageous for the preclinical testing of prophylactics, therapeutics, and new biomaterials. To this end, we have developed a novel mouse model for implantation of methicillin-resistant Staphylococcus aureus-infected surgical mesh and provide results from antibiotic and immunotherapeutic testing.

MATERIALS AND METHODS

Implantation of surgical mesh between fascial planes of the mouse hind limb was used to approximate hernia repair in humans. Surgical mesh was inoculated with methicillin-resistant Staphylococcus aureus to test the efficacy of antibiotic therapy with daptomycin and/or immunotherapy to induce macrophage phagocytosis using antibody blockade of the CD47 "don't eat me" molecule. Clinical outcomes were assessed by daily ambulation scores of the animals and by enumeration of mesh-associated bacteria at predetermined end points.

RESULTS

A single prophylactic treatment with daptomycin at the time of surgery led to improved ambulation scores and undetectable levels of bacteria in seven of eight mice by 21 days postinfection. Anti-CD47, an activator of macrophage phagocytosis, was ineffective when administered alone or in combination with daptomycin treatment. Ten days of daily antibiotic therapy begun 3 days after infection was ineffective at clearing infection.

CONCLUSIONS

This fast and simple model allows rapid in vivo testing of novel antimicrobials and immunomodulators to treat surgical implant infections.

DEVELOPMENT OF THE TAILORED APPROACH IN INGUINAL HERNIA REPAIR

The aim of the study is to evaluate the effectiveness of a personalized algorithm for determining the technique of surgical treatment of inguinal hernias, which allows choosing the optimal operational tactics (its modifications) depending on the anthropometric, clinical, instrumental data of the patient.

In the course of the study, the results of the application of a clinical algorithm in the Medical research and Educational center of Lomonosov Moscow State University for patients with unilateral non-incarcerated symptomatic inguinal hernias were analyzed. The frequencies of the main postoperative adverse outcomes of the research group were compared using the algorithm and patients of the German Herniamed Hernia Register, for whom only standard principles of surgical intervention selection are applied, the main provisions of the recommendations of the international HerniaSurge Group of experts. In some cases individual exceptional factors of patients were taken into account.

The frequency of chronic pain and pain requiring repeated surgery was significantly lower than the average frequencies of the German Herniamed register (13.8% vs 28.7% (p<0.00001) and 0.99% vs 3.8% (p=0.0103) respectively). At the same time, the frequency of adverse outcomes, such as relapses and early postoperative complications, is similar to international population data.