Incidence of inguinal hernia repairs in Olmsted County, MN: a population-based study

The missed diagnosis of femoral hernias in females undergoing inguinal hernia repair - A systematic review and proportional meta-analysis

BACKGROUND

Given the 4-times higher prevalence of femoral hernias among females compared to males, this diagnosis may be missed during inguinal hernia repair (IHR), causing risk of reoperation for pseudo recurrence of femoral hernias (FH). Minimally invasive approaches are suggested as potential reducers of missed FH since they provide a posterior view of all defect areas, despite studies suggesting that women receive less MIS than men. We aim to assess the missed FH during IHR and after reoperation for recurrence following IHR in women.

METHODS

PubMED, Cochrane, and EMBASE databases were searched for studies assessing patients undergoing recurrent IHR, analyzing the incidence of reoperation for FH and occult femoral hernias during IHR. Statistical analysis was performed using R software.

RESULTS

From 6,226 records, 10 retrospective observational studies were included, totaling 15,863 patients (20% females). We found that 19.56 per 100 women (95% CI 8.34, 39.37) who are reoperated for an inguinal hernia are found as having a FH during the new repair. Compared to men, women were at a significantly higher risk to be reoperated for FH after IHR (RR 8.97; 95% CI 7.35, 10.93; P < 0.001). Our analysis also showed that 20.7% of females received MIS approaches for groin hernia repair, while 79.3% received open procedures. Furthermore, our study found a pooled incidence of occult FH during the initial IHR of 6.85 per 100 patients for both genders (95% CI 2.78, 15.90), which increased to 21.42 per 100 patients when assessing females only (95% CI 15.46, 28.89).

CONCLUSIONS

Females have a higher incidence of FH following reoperation for recurrence of inguinal hernia repair. Added to the high rate of occult FH encountered during inguinal procedures, this suggests a missed diagnosis of FH during IHR. The adoption of MIS IHR for women is fundamental to reduce the underdiagnosis of FH.

Operative versus conservative management for inguinal hernia: a methodology scoping review of randomized controlled trials

INTRODUCTION

There is a lack of consensus on the management of inguinal hernia with limited symptoms. To address this issue a systematic review of existing randomized clinical trials (RCTs) was performed to critically appraise all existing data on asymptomatic hernia management, focusing on generalizability.

METHODS

A scoping review to identify all RCTs comparing surgical and conservative management of patients with inguinal hernias was undertaken. Medline, Embase, Cochrane and ClinicalTrials.gov databases were searched. Data collected included study characteristics and definitions of population, intervention/comparator, and outcomes; and limitations of each study were also extracted. The quality and generalizability of included RCTs were evaluated using Cochrane's ROB-2 and the PRECIS-2 tool, respectively.

RESULTS

Searches returned 661 papers; 14 full-text papers were assessed and three RCTs were identified. All RCTs included only male patients with a mean age above 55 years. All RCTs included asymptomatic patients and two included those with minimal symptoms. Different definitions for 'minimally symptomatic' were used in RCTs and none provided details of what was meant by conservative treatment. Follow-up periods varied between studies (1, 2, 3 years). All RCTs had an overall high risk of bias. According to PRECIS-2, two RCTs were classified as pragmatic, and one was equally pragmatic and explanatory.

DISCUSSION

This systematic review highlights a high risk of bias but a good generalizability of the findings from the RCTs conducted on minimally symptomatic inguinal hernia patients. To improve the guidelines for the management of this group of patients, more generalizable data are needed.

Patient's Perception of the Role of Gym Activity in Abdominal Wall Herniation in Adults: A Prospective Study

BACKGROUND

Despite significant changes in healthcare, work practices, and leisure activity, the proposed precipitating factors for abdominal wall hernias have remained largely unchanged for almost two centuries. We aimed to investigate if there have been shifts in these factors over time by examining patients' perception of precipitating factors for abdominal wall hernia development. This study was conducted in the Royal College of Surgeons In Ireland Department of Surgery, Connolly Hospital, Blanchardstown, Dublin, where patients with abdominal wall hernias completed a questionnaire  .

RESULTS

A total of 277 patients (mean age 55.7; 85.6% male) with abdominal wall hernia completed the questionnaire (66.1% inguinal; 10.8% umbilical; 6.9% paraumbilical; 10.5% epigastric; 3.2% incisional; 1.4% femoral, and 1.1% port-site). One hundred and twenty patients (43.3%) believed their hernia was due to lifting, 71 (25.6%) cited gym activity and 17 (6.1%) cited other sporting activities as the precipitating factor. Traditional factors - chronic cough and constipation - were cumulatively cited only by 11 patients (4.0%), while prostatic obstruction was not cited by any.

CONCLUSION

This study suggests that fitness pursuits may be an increasing contributor to the development of abdominal wall hernia. Greater attention should be paid to the proper use of gym equipment to minimise the risk of hernia development.

The Prevalence, Awareness, and Associated Risk Factors of Inguinal Hernia Among the Adult Population in Saudi Arabia

PURPOSE

Inguinal hernias lead to several potentially fatal complications such as strangulation. Assessing the prevalence, risk factors, and beliefs of a population is essential to develop appropriate preventive strategies. This study investigated the prevalence, risk factors, and awareness of inguinal hernia in the adult population of Saudi Arabia.

METHODS

This cross-sectional study enrolled 461 adults aged between 18 and 60 years after excluding those aged <18 and >60 years. This study was conducted in five regions of Saudi Arabia (north, west, central, south, and east). A pre-tested questionnaire was used to collect data on the prevalence, perception, and awareness of the participants. Multivariate regression analysis was used to identify risk factors for inguinal hernia.

RESULTS

The study revealed that most participants were men n=262 (56.8%), aged between 18 and 25 years n=241 (52.3%), were single n=278 (60.3%), had a bachelor's degree n=225 (48.8%) and earned less than 50,000 Saudi Riyals annually n=285 (61.8%). Most participants resided in urban areas n=366 (79.4%) with their parents n=230 (49.9%). The prevalence of inguinal hernias in adults was low (5.2%). Our results indicated a significant association between family history of inguinal hernia, chronic cough, bronchial asthma, smoking, and inguinal hernia (p < 0.001). Young adults and undergraduates displayed significantly low awareness of inguinal hernias (p < 0.001).

CONCLUSION

Family history of inguinal hernia, chronic cough, bronchial asthma, and smoking were factors associated with inguinal hernia. Low awareness levels were observed among young undergraduates, with a moderate overall level of awareness.

Remodeling and Regenerative Properties of Fully Absorbable Meshes for Abdominal Wall Defect Repair: A Systematic Review and Meta-Analysis of Animal Studies

Fully absorbable meshes can repair abdominal wall defects and effectively reduce the incidence of complications, but different types of fully absorbable meshes have different remodeling and regeneration effects. In order to investigate and compare the effects of different fully absorbable meshes on remodeling and regeneration in animals and reduce the biological risk of clinical translation, SYRCLE was adopted to evaluate the methodological quality of the included studies, and GRADE and ConQual were used to evaluate the quality of evidence. According to the inclusion and exclusion criteria, a total of 22 studies related to fully absorbable meshes were included in this systematic review. These results showed that fiber-based synthetic materials and fiber-based natural materials exhibited better restorative and regenerative effects indicated by infiltration and neovascularization, when compared with a porcine acellular dermal matrix. In addition, the human acellular dermal matrix was found to have a similar regenerative effect on the host extracellular matrix and scaffold degradation compared to the porcine acellular dermal matrix, porcine intestinal submucosa, and fiber-based natural materials, but it offered higher tensile strength than the other three. The quality of the evidence in this field was found to be poor. The reasons for downgrading were analyzed, and recommendations for future research included more rigor in study design, more transparency in result reporting, more standardization of animal models and follow-up time for better evaluation of the remodeling and regenerative performance of abdominal wall hernia repair meshes, and less biological risk in clinical translation.

Female sex and ipsilateral reoperation risk following mesh-based inguinal hernia repair: a cohort study including 131,626 repairs in adults from an integrated healthcare system over a 10-year period

PURPOSE

We sought to compare females and males for the risk of reoperation following different inguinal hernia repair approaches (open, laparoscopic, and robotic).

METHODS

We conducted a retrospective cohort study including all patients aged ≥ 18 who underwent first inguinal hernia repair with mesh within a US integrated healthcare system (2010-2020). Data were obtained from the system's integrated electronic health record. Multiple Cox proportional-hazards regression was used to evaluate the association between sex and risk for ipsilateral reoperation during follow-up. Analysis was stratified by surgical approach (open, laparoscopic, and robotic).

RESULTS

The study cohort was comprised of 110,805 patients who underwent 131,626 inguinal hernia repairs with mesh, 10,079 (7.7%) repairs were in females. After adjustment for confounders, females had a higher risk of reoperation than males following open groin hernia repair (hazard ratio [HR] = 1.98, 95% CI 1.74-2.25), but a lower reoperation risk following laparoscopic repair (HR = 0.70, 95% CI 0.51-0.97). The crude 5-year cumulative reoperation probability following robotic repair was 2.8% in males and no reoperations were observed for females. Of females who had a reoperation, 10.3% (39/378) were for a femoral hernia, while only 0.6% (18/3110) were for femoral hernias in males.

CONCLUSION

In a large multi-center cohort of mesh-based inguinal hernia repair patients, we found a higher risk for reoperation in females after an open repair approach compared to males. Lower risk was observed for females through a minimally invasive approach (laparoscopic or robotic) and may be due to the ability to identify an occult femoral hernia through these approaches.

Global, regional, and national burden of inguinal, femoral, and abdominal hernias: a systematic analysis of prevalence, incidence, deaths, and DALYs with projections to 2030

BACKGROUND

Hernias, particularly inguinal, femoral, and abdominal, present a global health challenge. While the Global Burden of Disease (GBD) study offers insights, systematic analyses of hernias remain limited. This research utilizes the GBD dataset to explore hernia implications, combining current statistics with 2030 projections and frontier analysis.

METHODS

We analyzed data from the 2019 GBD Study, focusing on hernia-related metrics: prevalence, incidence, deaths, and disability-adjusted life years (DALYs) across 204 countries, grouped into 21 GBD regions by the SDI (SDI). Data analysis incorporated relative change calculations, Annual Percentage Change (APC), Average Annual Percentage Change (AAPC), and Joinpoint Regression Analysis. The study also employed frontier analysis and the Bayesian Age-Period-Cohort model for trend prediction up to 2030. Analyses utilized R version 4.2.3.

RESULTS

From 1990 to 2019, global hernia cases surged by 36%, reaching over 32.5 million, even as age-standardized rates declined. A similar pattern was seen in mortality and DALYs, with absolute figures rising but age-standardized rates decreasing. Gender data between 1990 and 2020 showed consistent male dominance in hernia prevalence, even as rates for both genders fell. Regionally, Andean Latin America had the highest prevalence, with Qatar and Bulgaria noting significant increases and decreases, respectively. Frontier analyses across 204 countries linked higher SDIs with reduced hernia prevalence. Yet, some high SDI countries, like Qatar and the UK, deviated unexpectedly. Predictions up to 2030 anticipate increasing hernia prevalence, predominantly in males, while death rates are expected to decline. DALYs, after declining, are stabilizing.

CONCLUSIONS

Our analysis reveals a complex interplay between socio-demographic factors and hernia trends, emphasizing the need for targeted healthcare interventions. Despite advancements, vigilance and continuous research are essential for optimal hernia management globally.

Identification of mixed anaerobic infections after inguinal hernia repair based on metagenomic next-generation sequencing: A case report

Infection following inguinal hernia repair (IHR) is uncommon. Rational use of antibiotics can significantly improve the prognosis of patients. However, accurately identifying the pathogen involved is usually challenging. This case report describes a patient who developed intermittent fever after undergoing open preperitoneal tension-free repair of a bilateral inguinal hernia. The scrotal fluid specimen was cultured and subjected to metagenomic next-generation sequencing (mNGS). Culture revealed the presence of Enterococcus faecalis (a facultative anaerobe). However, mNGS detected E. faecalis along with multiple anaerobic bacteria including Bacteroides thetaiotaomicron, Parabacteroides distasonis, and Levyella massiliensis. The patient was finally diagnosed with a mixed infection of E. faecalis and multiple anaerobes, and his condition was effectively controlled after timely adjustment of the antibiotic regimen. Treating postoperative infections with multiple concurrent conditions can be challenging. mNGS is valuable for the accurate diagnosis and treatment of infections, as it not only can further verify the culture results, but also assist clinicians in ruling out pulmonary infection caused by hematogenous dissemination after IHR in patients.

Risk factors for inguinal hernia repair among US adults

PURPOSE

To investigate demographic, clinical, and behavioral risk factors for undergoing inguinal hernia repair within a large and ethnically diverse cohort.

METHODS

We conducted a retrospective case-control study from 2007 to 2020 on 302,532 US individuals from a large, integrated healthcare delivery system with electronic health records, who participated in a survey of determinants of health. Participants without diagnosis or procedure record of an inguinal hernia at enrollment were included. We then assessed whether demographic (age, sex, race/ethnicity), clinical, and behavioral factors (obesity status, alcohol use, cigarette smoking and physical activity) were predictors of undergoing inguinal hernia repair using survival analyses. Risk factors showing statistical significance (P < 0.05) in the univariate models were added to a multivariate model.

RESULTS

We identified 7314 patients who underwent inguinal hernia repair over the study period, with a higher incidence in men (6.31%) compared to women (0.53%). In a multivariate model, a higher incidence of inguinal hernia repair was associated with non-Hispanic white race/ethnicity, older age, male sex (aHR = 13.55 [95% confidence interval 12.70-14.50]), and more vigorous physical activity (aHR = 1.24 [0.045]), and alcohol drinker status (aHR = 1.05 [1.00-1.11]); while African-American (aHR = 0.69 [0.59-0.79]), Hispanic/Latino (aHR = 0.84 [0.75-0.91]), and Asian (aHR = 0.35 [0.31-0.39]) race/ethnicity, obesity (aHR = 0.33 [0.31-0.36]) and overweight (aHR = 0.71 [0.67-0.75]) were associated with a lower incidence. The use of cigarette was significantly associated with a higher incidence of inguinal hernia repair in women (aHR 1.23 [1.09-1.40]), but not in men (aHR 0.96 [0.91-1.02]).

CONCLUSION

Inguinal hernia repair is positively associated with non-Hispanic white race/ethnicity, older age, male sex, increased physical activity, alcohol consumption and tobacco use (only in women); while negatively associated with obesity and overweight status. Findings from this large and ethnically diverse study may support future prediction tools to identify patients at high risk of this surgery.

Laparoscopic Inguinal Hernia Repair for Female Patients: Experience from a High-volume Center in 20 years

BACKGROUND

Although laparoscopic inguinal hernia repair (LIHR) is widely performed worldwide, few studies have focused on the procedure in female patients. This study investigated the characteristics and outcomes of female patients with inguinal hernias who underwent LIHR.

MATERIALS AND METHODS

This study retrospectively analyzed the data of 7380 patients with inguinal hernia admitted to the General Surgery Department of Ruijin Hospital and underwent LIHR from January 2001 to December 2020. The clinical characteristics, surgical outcomes, and complications were assessed.

RESULTS

In total, 572 female patients were enrolled in this study. The proportion of femoral hernias in female patients was higher in women than in male patients (17.4% vs. 0.3%, respectively). Mesothelial cysts of the round uterine ligament (MCURL) were noted in 74 patients. The mean age of patients with MCURL was lower than that of patients without MCURL (46.4 vs. 55.6, P =0.018). Seventy cases (93.3%) of MCURL were resected laparoscopically, and 5 cases were resected through an auxiliary small incision. The round ligament was cut off in 335 patients and preserved in 237. No significant differences were observed in the number of hospitalization days, recurrence rates, or complications between the transection and preservation groups. None of the cases were converted to laparotomy, and no recurrence was noted during follow-up.

CONCLUSION

LIHR is safe and feasible in female patients. Treatment of femoral hernia, MCURL, and the round ligament of the uterus should be carefully considered during LIHR in female patients.

The global, regional, and national burden and its trends of inguinal, femoral, and abdominal hernia from 1990 to 2019: findings from the 2019 Global Burden of Disease Study - a cross-sectional study

BACKGROUND

Inguinal, femoral, and abdominal hernia repairs are the most common surgical procedure worldwide. However, studies on hernia disease burden are notably limited, in both developed and low-income and middle-income countries (LMICs). We investigated temporal trends in the incidence and prevalence of inguinal, femoral, and abdominal hernias at global, regional, and national levels in 204 countries and territories from 1990 to 2019 using data from the Global Burden of Diseases, Injuries, and Risk Factors Study 2019 (GBD 2019).

MATERIALS AND METHODS

Annual incident cases, prevalent cases, age-standardized incidence rates (ASIRs), and age-standardized prevalence rates (ASPRs) of inguinal, femoral, and abdominal hernias between 1990 and 2019 were extracted from the GBD 2019 study and stratified by sex, age, and location. Percentage changes in incident cases and prevalent cases, and the estimated annual percentage changes of ASIRs and ASPRs were calculated to quantify the trends in the incidence and prevalence of inguinal, femoral, and abdominal hernias. Data analysis for the present study was conducted from 15 June 2022 to 15 July 2022.

RESULTS

Globally, there were 32.53 million [95% uncertainty interval (UI): 27.71-37.79] prevalent cases and 13.02 million (10.68-15.49) incident cases of inguinal, femoral, and abdominal hernias in 2019, which increased by 36.00% and 63.67%, respectively, compared with 1990. Eighty-six percent of the incident cases were males, the male-to-female ratio was 6 : 1, and most patients were aged 50-69 years. India (2.45 million), China (1.95 million), and Brazil (0.71 million) accounted for more than one-third (39%) of the incident cases worldwide. From 1990 to 2019, the ASIR and ASPR showed a decreasing trend worldwide, except in Central Sub-Saharan Africa, which had an increasing trend in ASIR and ASPR.

CONCLUSION

The global incident cases and prevalent cases of inguinal, femoral, and abdominal hernias increased substantially from 1990 to 2019, with a heavier burden observed in males, older adults, and in LMICs such as India and China. In addition, the ASIR and ASPR increased substantially in Central Sub-Saharan Africa. More efforts are warranted for hernia management to reduce the burden of inguinal, femoral, and abdominal hernias, such as by providing safe hernia surgical treatment for males, older adults, and LMICs.

Minimally Invasive Repair of Recurrent Inguinal Hernia: Multi-Institutional Retrospective Comparison of Robotic Versus Laparoscopic Surgery

Introduction: Inguinal hernia repair is one of the most commonly performed surgical procedures in general surgery. Despite surgical advances, recurrence and chronic pain are still major issues after this intervention. Aim of our study was to retrospectively assess and compare outcomes of robotic versus laparoscopic repair of recurrent inguinal hernia. Methods: All patients who underwent recurrent inguinal hernia repair between 2014 and 2021 in five different institutions were included in our study. Baseline data on age, gender, body mass index, comorbidities, smoking habit, and anticoagulant therapy were retrospectively collected from prospectively maintained databases. Operative time, length of stay, and early and late complications were compared between the robotic and the laparoscopic approach. Results: Forty-eight patients underwent recurrent inguinal hernia repair between January 2014 and December 2021. Twenty-three patients underwent a robotic procedure, whereas 25 were submitted to the laparoscopic intervention. Overall mean follow-up was 26.2 months. There was no significant difference in the baseline characteristics of the two groups. Acceptable and comparable rates of peri- and postoperative outcomes were recorded. However, postoperative visual analog scale score and incidence of chronic pain were lower after the robotic rather than after the laparoscopic approach. (2.9 versus 3.8 P = .002; 20% versus 0%; P = .02, respectively). Conclusions: Minimally invasive repair of recurrent inguinal hernia is safe and feasible; robotic surgery is associated with low rate of postoperative and chronic pain without a significant increase in operative time.

Inguinal hernia in southern Brazil - challenges in follow-up and recurrence rates

INTRODUCTION

recurrence rates for primary hernia repair range from 0.5 to 15 percent depending upon the hernia site, type of repair, and clinical circumstances. Many risk factors are known and they must be considered before the procedure. In developing countries, follow up and maintenance of databases are critical to understand the real numbers.

METHODS

a retrospective cohort study analyzed adult patients who have undergone inguinal hernia repair at Hospital de Clínicas de Porto Alegre, a tertiary care government public hospital, between 2013 and 2015. Medical records, telephone, and letter contact have been reviewed in order to complete the minimum period of 5 years of follow-up. The analyzed data focused on the surgeon's experience and the recurrence rate in 5 years of follow-up.

RESULTS

a total of 1094 medical records were selected and a complete five years follow-up were possible in 454 patients - 538 inguinal hernia repairs due to bilateral approach in 84 patients. These 454 patients answered, in a validated questionnaire about symptoms of recurrence. The total recurrence rate was 9.29%. For the patients who had Nyhus IV, recurrence rate was 24.1% against 9.9% after primary hernia repair, with a 2.4 higher risk. There was no difference in recurrence between surgeons and training surgeons.

CONCLUSION

our data reveal an acceptable recurrence rate in a tertiary care hospital with residents, and to our knowledge is the first Brazilian report with long term follow up. An increased re-recurrent hernia was found when compared with primary hernia repair.

Inguinal hernia repairs performed for recurrence in Spain: population-based study of 16 years and 1,302,788 patients

PURPOSE

The objective of this study was to assess data on inguinal hernia repairs (IHR) performed for recurrence over a 16 year period (2004-2019) in Spain.

METHODS

A retrospective cohort study of 1,302,788 patients who underwent IHR from January 2004 to December 2019 was conducted. Data were extracted from the Spanish Minimum Basic Data Set (MBDS) of the Health Ministry database. The primary objective was to analyse the proportion of IHR performed by recurrence. As secondary objectives, we evaluated factors related to recurrent hernia (analysed by univariate analysis and multivariable logistic regression analysis) and trends in the recurrent case rate over the 16 year period.

RESULTS

We identified 95,025 patients (7.3% of all IHR) who underwent surgery for recurrent inguinal hernia. Patients undergoing recurrent IHR were more likely to be male (OR 1.687, 95% CI 1.645-1.730), elderly (age > 74 years), and more complicated when they arrived in the operating room (gangrene OR 3.951, 95% CI 3.734-4.180; occlusion OR 1.905, 95% CI 1.853-1.960), and thus had more surgical site occurrences and related mortality. The proportion of IHR performed for recurrence has been dropping over the years (8.7% in 2004 vs. 6.5% in 2019, p < 0.005).

CONCLUSION

The rate of recurrent IHR in Spain (2004-2019) is 7.3%. Recurrent IHR correlates to emergent and complicated surgery and thus to a worst outcome. The trend of this 16 year period is of decreasing operated recurrent inguinal hernia. This is good news even though the improvement is slight and certainly insufficient. Establishing and optimising the rate of hernia recurrence is important for patients and for the health-care system.

Hérnia inguinal no Sul do Brasil - desafios no seguimento e taxas de recorrência

RESUMO Introdução: a recorrência da hérnia inguinal após hernioplastia varia de 0,5 a 15 por cento, dependendo do local da hérnia, tipo de reparo e circunstâncias clínicas. Muitos fatores de risco são conhecidos e devem ser considerados antes do procedimento. Acompanhamento e adequado bancos de dados são fundamentais para entender a incidência de recidiva. Métodos: estudo de coorte retrospectivo analisou hernioplastias inguinais realizados no Hospital de Clínicas de Porto Alegre entre 2013 e 2015. Para concluir 5 anos de seguimento, analisamos o prontuário e fizemos contato telefônico e por correio. Resultados: o total de 1094 registros médicos foram selecionados e um seguimento de pelo menos 5 anos foi possível em 454 pacientes - 538 reparos de hérnia inguinal devido à abordagem bilateral em 84 pacientes. Os pacientes responderam um questionário validado sobre sintomas de recorrência. A taxa total de recorrência foi de 9,29%. No grupo masculino, a recorrência foi de 10% contra 4% no grupo feminino. Para os pacientes com hérnia Nyhus IV, a recidiva foi de 24% contra 8% após o reparo da hérnia primária, com um risco de 2,8 maior. Não houve diferença na recorrência entre cirurgiões experientes e em treinamento. Conclusão: nossos dados revelam uma taxa de recorrência aceitável em um hospital de ensino, e para o nosso conhecimento é o primeiro artigo com acompanhamento de longo prazo no sul do Brasil. A re-recidiva da hérnia foi maior quando comparada com o reparo da hérnia primária.

Local anesthesia as an alternative option in repair of recurrent groin hernias: An outcome study from the American College of Surgeons NSQIP® database

Introduction

There is a dearth of data about the benefits of local anesthesia (LA) and spinal anesthesia (SA) compared to general anesthesia (GA) in patients undergoing repair of recurrent groin (inguinal/femoral) hernias. We hypothesized that patients with recurrent hernias who undergo repair under LA and SA will have a better outcome.

Methods and procedures

Using the 2017 American College of Surgeons (ACS) National Surgical Quality Improvement Program (NSQIP)® database, patients who underwent open repair of recurrent groin hernias were identified and divided into three groups: GA, SA, and LA. Outcomes evaluated included 30-day mortality and morbidity, operative time, total hospital length of stay (LOS), and reoperation and readmission rates.

Results

A total of 2169 patients were identified of which 1847 (85.2%) were in GA, 53 (2.4%) in SA, and 269 (12.4%) in LA groups. Overall, no statistically significant differences in demographics and comorbidities between the three groups were identified. However, patients in GA were younger and healthier with lower ASA Class (I-II) as compared to SA and LA groups. Patients in SA had a higher rate of COPD, and their overall operative time was shorter. However, LA patients had shorter LOS, and most LA patients were discharged home on the same day compared to GA, SA (92.2% vs. 77.9%, and 73.6%, p < 0.001). No differences in 30-day mortality and morbidity or reoperation and readmission rates between the three groups were noted.

Conclusion

There is an underutilization of LA in patients undergoing open repair of recurrent inguinal hernia despite favorable outcomes, even in high-risk patients, when compared to GA and SA. Further prospective studies are needed to explore the potential barriers and cost-effectiveness of implementing LA as a primary anesthetic technique in inguinal hernia repair.

Inguinal hernia repair in inpatient children: a nationwide analysis of German administrative data

Background

Contrary to adult inguinal hernia surgery, large-scale investigations using registries or administrative data are missing in paediatric surgery. We aimed to fill this gap by analysing German administrative hospital data to describe the current reality of inpatient hernia surgery in children.

Methods

We analysed aggregated data files bought from the German federals statistics office on hospital reimbursement data separately for principal diagnoses of inguinal hernia in children and for herniotomies in inpatients. Developments over time were assessed via regression and differences between groups with nonparametric comparisons.

Results

Principal diagnoses of hernias were decreasing over time with the exception of male bilateral and female bilateral incarcerated hernias in the first year of life which increased. The vast majority of operations were conducted via the open approach and laparoscopy was increasingly only used for females older than 1 year of age. Recurrent hernia repair was scarce. Rates of inguinal hernia repair were higher in both sexes the younger the patient was, but were also decreasing in all age groups despite a population growth since 2012. The amount of inguinal hernia repairs by paediatric surgeons compared to adult surgeons increased by 1.5% per year.

Conclusions

Our results corroborate previous findings of age and sex distribution. It demonstrates that inpatient hernia repair is primarily open surgery with herniorrhaphy and that recurrences seem to be rare. We observed decreasing rates of hernia repairs over time and as this has been described before in England, future studies should try to elucidate this development.

Level of evidence

III.

Inguinal hernia – epidemiology, risk factors, treatment methods (literature review)

Inguinal hernias (IH) are widespread in the human population and occur in 27–43 % of men and 3–6 % of women. Many risk factors for IH have been overestimated in the last decade: male gender is considered the leading factor (the ratio between men and women is approximately 1:7), less significant factors are heredity (most significant for women), physical activity (more significant for men), age (peak prevalence of IH occurs at 5 years and 70–80 years), congenital or acquired connective tissue dysplasia, history of prostatectomy, low body mass index.Hernioplasty with the use of synthetic mesh prostheses remains the most popular technique for surgical correction of IH. Performing non-prosthetic hernioplasty is only recommended if mesh prostheses are not available, for example in poor countries. In open hernioplasty using mesh prostheses, different methods are used today: Plug & Patch, Prolene Hernia System, Parietene Progrip, sutureless plastic according to Trabucco, Stoppa, preperitoneal techniques TIPP (trans-inguinal pre-peritoneal), TREPP (transrectus pre-peritoneal), TEP (total extraperitoneal), however, none of them showed significant advantages over the gold standard of open hernioplasty – tensionfree repair according to Liechtenstein.Laparoscopic IH correction is represented by the TAPP (transabdominal preperitoneal) technique, performed through the abdominal cavity, and TEP (total extraperitoneal) – extraperitoneal prosthetic hernioplasty. None of them has a significant advantage in the treatment of IH; therefore, when choosing a treatment method, the surgeon should be guided by the cost of the operation and the level of proficiency in one or another hernioplasty technique.

Long-Term Trends and Predictors of Medical Resource Utilization and Medical Outcomes in Inguinal Hernia Repair: A Nationwide Cohort Study

BACKGROUND

Few studies have comprehensively and systematically analyzed nationwide samples. This study purposed to explore temporal trends and predictors of medical resource utilization and medical outcomes in these patients to obtain data that can be used to improve healthcare policies and to support clinical and administrative decision-making.

METHODS

This study used nationwide population data contained in the Longitudinal Health Insurance Database of Taiwan. The 14,970 inguinal hernia repair patients were enrolled in this study (age range, 18-100 years) from 1997 to 2013 in Taiwan. After temporal trends analysis of demographic characteristics, clinical characteristics, and institutional characteristics, predictors of postoperative medical resource utilization and medical outcomes were evaluated through multiple linear regression analysis and Cox regression analysis.

RESULTS

The prevalence of inguinal hernia repair per 100,000 population significantly decreased from 195.38 in 1997 to 39.66 in 2013 (p < 0.05). Demographic characteristics, clinical characteristics, and institutional characteristics were significantly associated with postoperative medical resource utilization and medical outcomes (p < 0.05). Of these characteristics, both surgeon volume and hospital volume had the strongest association.

CONCLUSIONS

The inguinal hernia repair prevalence rate gradually decreased during the study period. Demographic characteristics, clinical characteristics, and institutional characteristics had strong associations with postoperative medical resource utilization and medical outcomes. Furthermore, hospital volume and surgeon volume had the strongest associations with postoperative medical resource utilization and medical outcomes. Additionally, providing the education needed to make the most advantageous medical decisions would be a great service not only to patients and their families, but also to the general population.

The incidence of infantile hypertrophic pyloric stenosis nearly halved from 2005 to 2017: analysis of German administrative data

PURPOSE

Some paediatric surgical diseases showed a declining incidence in recent years, among which hypertrophic pyloric stenosis has been particularly striking shortly in the years after the millennium. We aimed to assess whether this development continued over the following decade, as it might offer the chance to better understand the underlying reasons.

METHODS

We analysed data files obtained from the German federal statistics office for principal diagnosis of hypertrophic pyloric stenosis and pyloromyotomies from 2005 to 2017. Changes over time were assessed via linear regression for incidences per 1000 live births.

RESULTS

In the respective time interval, there were a mean of 1009 pyloromyotomies (95% CI 906-1112) per year, of which a mean of 835 (95% CI 752-917) were performed in boys. The incidence of hypertrophic pyloric stenosis per 1000 live births almost halved between 2005 and 2017: it decreased by 0.12 pylorotomies annually (95% CI 0.09-0.14; P < 0.0001) in boys-from a maximum of 2.96 to a minimum of 1.63-and 0.03 pyloromyotomies annually (95% CI 0.02-0.04; P < 0.0001) in girls-from a maximum of 0.64 to a minimum of 0.28. There was considerable regional variation in incidences between the German länder.

CONCLUSION

The decreasing incidence of hypertrophic pyloric stenosis noted around the millenium continued into the following decades. The underlying reasons are unclear, which should prompt further research on the subject matter.

Impact of ultrasound on inguinal hernia repair rates in Australia: a population-based analysis

BACKGROUND

Inguinal hernias are a common pathology that often requires surgical management. The use of groin ultrasound (GU) to investigate inguinal hernias is a growing area of concern as an inefficient use of healthcare resources. Our aim was to assess changes in the rates of GU and the impact on surgical practice.

METHODS

Medicare Item Reports and the Australian Institute of Health and Welfare Database were used to estimate annual GU and inguinal hernia repair (IHR) rates per 100 000 population for the period 2000/2001-2017/2018. Pearson's correlation coefficients and linear regression analyses were performed to assess associations between these variables.

RESULTS

Over the 18-year period, GU rates increased 13-fold from 88 to 1174 per 100 000 population. Overall, total IHR rates decreased from 217 to 192 per 100 000. Overall, unilateral IHR rates have decreased (182-146 per 100 000), bilateral IHRs have increased (35-46 per 100 000), laparoscopic IHR has increased (30-86 per 100 000) and open surgery has declined (187-106 per 100 000). The increase in GU rates were strongly associated with the decrease in unilateral (r = -0.936, P = <0.001) and increase in bilateral IHR rates (r = 0.924, P = <0.001).

CONCLUSION

The use of GU has increased substantially, potentially representing an unnecessary cost to the healthcare system. Rising GU rates are not associated with an increase in IHR, however, may contribute to the increasing rates of bilateral IHRs. This study supports the opinion that more extensive clinical and health policy initiatives are needed in Australia to address this health issue.

Body Mass Index and Inguinal Hernia: An Observational Study Focusing on the Association of Inguinal Hernia With Body Mass Index

Objective An inguinal hernia is a common condition associated with advanced age, male gender, smoking, connective tissue disorder, and factors responsible for increased intra-abdominal pressure. This study aimed to observe the relationship of body mass index with the development of inguinal hernia in males and females. Methodology This cross-sectional descriptive study using a non-probability convenient sampling technique was carried out at Al-Tibri medical college and hospital, Karachi, Pakistan. A total of 82 patients were selected: 78 males and four females. The ethical approval for the study was taken from Institutional Research and Ethical Committee. Inclusion criteria based on the patient age above 40 of either gender with complaints of pain in the groin region with clinical findings like swelling and tenderness. Data were analyzed using Statistical Package for the Social Sciences (SPSS) version 20.0 (IBM Inc., Armonk, USA). Results The mean age of 82 patients diagnosed with an inguinal hernia on a clinical basis was 47.41 ± 15.49 years. The mean height was 67.09 ± 3.95 inches. The mean weight was 63.5 ± 6.77 kg. The mean BMI was 22.07 ± 2.17 kg/m². Seventy-eight (96.06%) were males, and four (5.9%) were females. Thirty-four (41.5%) patients were diagnosed with right inguinal hernia, 34 (41.5%) - with a left inguinal hernia, and 14 (17.1%) - with a bilateral inguinal hernia. BMI was normal in 68 (86.3%) and low in 14 (20.55%) patients. Our study indicated that patients with normal BMI were more likely to suffer from inguinal hernia than patients with low BMI. Conclusion This study concluded that the normal body mass index was associated with a high occurrence of inguinal hernia among the genders. The normal body mass index in males exhibits more inguinal hernia chances than a low body mass index. It was observed that the frequency of unilateral right inguinal hernia is higher than bilateral. Similarly, males are more affected than females.

Trends in Australian inguinal hernia repair rates: a 15-year population study

BACKGROUND

An inguinal hernia is one of the most common surgical pathologies, and therefore the repair of an inguinal hernia is one of the most common general surgical procedures. The aim of this study was to assess the trend in inguinal hernia repair (IHR) rates in Australia between 2000/2001 and 2014/2015 using population data from public and private hospitals.

METHODS

ICD-10 data cubes from the Australian Institute of Health and Welfare were analysed to determine the number of inguinal hernia repairs performed, open or laparoscopically, between 2000/2001 and 2014/2015 financial years. These data were combined with the Australian Bureau of Statistics population data estimates for the corresponding years, to give a procedure per 100 000 estimates.

RESULTS

Incidence of IHRs within Australia decreased from 217 to 194 per 100 000 population over the 15-year study period. There was a clear shift towards increased uptake of laparoscopic surgery with a subsequent fall in rates of open IHRs. Males accounted for the majority of IHR procedures. Unilateral repair was more common; however, the incidence of unilateral repair rates decreased while bilateral IHR rates increased over the study period.

CONCLUSION

Laparoscopic techniques are increasingly being used within public and private institutions across the country for inguinal hernia repair. There has also been a decrease in the incidence of IHR procedures performed per year over the 15-year period studied, consistent with published literature from Europe and the USA.

Femoral hernia in the era of TAVI - a potential obstacle for transfemoral approach: a case report and literature review

Background

Transcatheter aortic valve implantation (TAVI) via total percutaneous transfemoral approach is an increasingly common technique for aortic stenosis treatment. It is primarily indicated in elderly with serious comorbidities. The epidemiology of these patients tends to overlap with the incidence of femoral hernia (FH). The appearance of hernia sac at the approach site and insufficient preoperational examination can lead to serious complications. We present the first-ever reported case of subsequent femoral hernia repair during transfemoral TAVI.

Case presentation

This report presents a case of FH/TAVI coincidence and literature review of its epidemiology. Literature review was performed to analyze similarities of femoral hernia and TAVI. The case describes an 84-year old female referred for elective TAVI. Intraoperation incarcerated femoral hernia was noticed and directly repaired. Further TAVI steps were performed on regular basis. A 2-year follow-up reported no local and general complications related to procedures.

Conclusions

Unsuspected femoral hernia found subsequently with transfemoral TAVI may become a growing problem. The number of TAVI performed rises with indications expansion. Femoral hernia repairs constitute from 2 to 4% of all groin hernia. Both TAVI and FH are connected with elderly. Despite the fact of low FH incidence, growing number of TAVI performed and ageing of population, corresponds with higher possibility of complications. Most of these complications may end up fatal as they would involve high-risk patients. Insufficient attention is paid by cardiologists to the possible hernia appearance in the access site as this issue has been hardly ever presented in literature. Concomitant FH in TAVI patients should always be excluded in order to avoid serious complications. The case we report presents a successful subsequent FH repair during TAVI procedure. Further studies have to be conducted to provide data on how such problems ought to be managed.

Influencing Factors on the Outcome in Female Groin Hernia Repair: A Registry-based Multivariable Analysis of 15,601 Patients

OBJECTIVE

Based on an analysis of data from the Herniamed Registry, this study aims to identify all factors influencing the outcome in female groin hernia repair.

BACKGROUND

In a systematic review and meta-analysis of observational studies, female sex was found to be a significant risk factor for recurrence. In the guidelines, the totally extraperitoneal patch plasty (TEP) and transabdominal preperitoneal patch plasty (TAPP) laparo-endoscopic techniques are recommended for female groin hernia repair. However, even when complying with the guidelines, a less favorable outcome must be expected than in men. To date, there is no study in the literature for analysis of all factors influencing the outcome in female groin hernia repair.

METHODS

In all, 15,601 female patients from the Herniamed Registry who had undergone primary unilateral groin hernia repair with the Lichtenstein, Shouldice, TEP or TAPP technique, and for whom 1-year follow-up was available, were selected between September 1, 2009 and July 1, 2017. Using multivariable analyses, influencing factors on the various outcome parameters were identified.

RESULTS

In the multivariable analysis, a significantly higher risk of postoperative complications, complication-related reoperations, recurrences, and pain on exertion was found only for the Lichtenstein technique. No negative influence on the outcome was identified for the TEP, TAPP, or Shouldice techniques. Relevant risk factors for occurrence of perioperative complications, recurrences, and chronic pain were preoperative pain, existing risk factors, larger defects, a higher body mass index (BMI), higher American Society of Anesthesiologists (ASA) classification and postoperative complications. Higher age had a negative association with postoperative complications and positive association with pain rates.

CONCLUSIONS

Female groin hernia repair should be performed with the TEP or TAPP laparo-endoscopic technique, or, alternatively, with the Shouldice technique, if there is no evidence of a femoral hernia. By contrast, the Lichtenstein technique has disadvantages in terms of postoperative complications, recurrences, and pain on exertion. Important risk factors for an unfavorable outcome are preoperative pain, existing risk factors, higher ASA classification, higher BMI, and postoperative complications. A higher age and larger defects have an unfavorable impact on postoperative complications and a more favorable impact on chronic pain.

Predictive factors for the development of surgical site infection in adults undergoing initial open inguinal hernia repair

INTRODUCTION

Despite being one of the most commonly performed general surgery procedures, surgical site infection (SSI) is still seen in primary, elective, open inguinal hernia repair. Studies have reported a wide range of infection rates, yet predictive risk factors have not been definitely identified leading to variability and controversy in the use of pre-operative antibiotics. In this study, the authors seek to identify factors predictive of SSI development in a large cohort of patients undergoing initial unilateral open inguinal repair.

METHODS

The American College of Surgery National Surgical Quality Improvement Program (ACS NSQIP) personal use file (PUF) database was queried for initial, open, reducible inguinal hernia repair cases in adults with clean surgical sites performed from 2012 to 2015 (CPT 49,505 and class one wound). Patient data were analyzed using univariate and multivariate analysis to identify factors predictive of surgical site infection.

RESULTS

57,951 cases were identified. 90.8% were men with an average age of 58.2 years and a median operative time of 53.0 min. Of all variables evaluated with univariate logistic regression, 17 demonstrated an association with surgical site infection. Performing multiple logistic regression on those 17 variables yielded 3 factors independently associated with surgical site infection: diabetes (OR 2.017, 95% CI 1.012-4.023), BMI ≥ 35 kg/m² (OR 2.587, 95% CI 1.123-5.964), and current smoking (OR 2.071, 95% CI 1.126-3.811).

CONCLUSION

Diabetes, BMI ≥ 35 kg/m², and current smoking are significantly associated with an increased odds surgical site infection after initial, open, reducible inguinal hernia repair in adults with clean surgical sites.

Incidence of postoperative complications in transabdominal preperitoneal repair for groin hernia is influenced by poor performance status rather than by old age

AIM

The present study was designed to evaluate the safety and feasibility of transabdominal preperitoneal (TAPP) repair for very old patients with groin hernia and to identify the risk factors predicting perioperative complications.

METHODS

A total of 140 patients treated by TAPP were reviewed retrospectively. They were divided into two groups: patients ≥80 years of age (≥80 years group; n = 26) and those <80 years of age (<80 years group; n = 114). Patient characteristics and surgical outcomes were then statistically compared between the two groups.

RESULTS

Number of patients with any comorbidities was significantly higher in the ≥80 years group than in the <80 years group (96.2% vs 61.4%, P = 0.003). There were no significant differences in surgical outcomes between the two groups. In the univariate analysis of perioperative complications, poor performance status (PS) (P = 0.014), lower hemoglobin level (P = 0.038) and lower albumin level (P = 0.016) were significantly associated with the occurrence of postoperative complications, and multivariate analysis showed that only poor PS was an independent factor (PS 0-2 vs 3-4: P = 0.034, OR 5.192 [95% CI; 1.137 to 23.71]).

CONCLUSIONS

This is the first report to show that the incidence of postoperative complications in TAPP repair for groin hernia is influenced by poor PS rather than old age. TAPP can be a safe surgical procedure for very old patients with a good PS, with benefits that are equal to those in young patients.

Groin Hernias in Women-A Review of the Literature

Background: To date, there are few studies and no systematic reviews focusing specifically on groin hernia in women. Most of the existing knowledge comes from registry data. Objective: This present review now reports on such findings as are available on groin hernia in women. Materials and Methods: A systematic search of the available literature was performed in September 2018 using Medline, PubMed, Google Scholar, and the Cochrane Library. For the present analysis 80 publications were identified. Results: The lifetime risk of developing a groin hernia in women is 3-5.8%. The proportion of women in the overall collective of operated groin hernias is 8.0-11.5%. In women, the proportion of femoral hernias is 16.7-37%. Risk factors for development of a groin hernia in women of high age and with a positive family history. A groin hernia during pregnancy should not be operated on. The rate of emergency procedures in women, at 14.5-17.0%, is 3 to 4-fold higher than in men and at 40.6% is even higher for femoral hernia. Therefore, watchful waiting is not indicated in women. During surgical repair of groin hernia in females the presence of a femoral hernia should always be excluded and if detected should be repaired using a laparo-endoscopic or open preperitoneal mesh technique. A higher rate of chronic postoperative inguinal pain must be expected in females. Conclusion: Special characteristics must be taken into account for repair of groin hernia in women.

Shift from androgen to estrogen action causes abdominal muscle fibrosis, atrophy, and inguinal hernia in a transgenic male mouse model

Inguinal hernia is one of the most common disorders that affect elderly men. A major pathology underlying inguinal hernia is the fibrosis and other degenerative changes that affect the lower abdominal muscle strength adjacent to the inguinal canal. Here we describe a critical role of estrogen and its nuclear receptor that enhance fibroblast proliferation and muscle atrophy, leading to inguinal hernia. Further research may reveal a potential role of estrogen ablation to prevent muscle fibrosis or hernia in a subset of elderly men.

Inguinal hernia develops primarily in elderly men, and more than one in four men will undergo inguinal hernia repair during their lifetime. However, the underlying mechanisms behind hernia formation remain unknown. It is known that testosterone and estradiol can regulate skeletal muscle mass. We herein demonstrate that the conversion of testosterone to estradiol by the aromatase enzyme in lower abdominal muscle (LAM) tissue causes intense fibrosis, leading to muscle atrophy and inguinal hernia; an aromatase inhibitor entirely prevents this phenotype. LAM tissue is uniquely sensitive to estradiol because it expresses very high levels of estrogen receptor-α. Estradiol acts via estrogen receptor-α in LAM fibroblasts to activate pathways for proliferation and fibrosis that replaces atrophied myocytes, resulting in hernia formation. This is accompanied by decreased serum testosterone and decreased expression of the androgen receptor target genes in LAM tissue. These findings provide a mechanism for LAM tissue fibrosis and atrophy and suggest potential roles of future nonsurgical and preventive approaches in a subset of elderly men with a predisposition for hernia development.

Feasibility and safety of elective laparoscopic total extraperitoneal preperitoneal groin hernia repair in the elderly: a propensity score-matched comparison

Background

Several studies of hernia registries have revealed that elderly patients have higher perioperative complication rates compared with younger patients. However, the incidence of hernia increases with the aging process. To evaluate the feasibility and safety of laparoscopic hernia repair in elderly patients (≥75 years), we conducted a prospective case-matched control study to compare perioperative outcomes between patients older and younger than 75 years.

Methods

Between September 2008 and July 2015, 572 consecutive patients undergoing endoscopic hernia repair were included in this prospective study. This case-matched control study was matched based on sex, American Society of Anesthesiologists score, and body mass index between patients younger and ≥75 years. The propensity-score matching of two groups was carried out on a 1:1 basis. Perioperative data were prospectively recorded for all patients including demographic data, operation time, length of hospital stay, narcotic dose, and complications.

Results

In the final analysis, 54 patients who were <75 years were extracted to match the 54 patients ≥75 years. These two groups had similar baseline characteristics excluding age. They also had similar perioperative outcomes in hernia recurrence, metachronous contralateral hernia occurrence, complication rate and chronic pain. The patients ≥75 years of age had lower requirements for analgesics than those who were <75 years of age (p=0.047).

Conclusion

This is the first comparative cohort study investigating the impact of aging in an Asian hernia population. Laparoscopic inguinal hernia repair is feasible and safe for older patients, with comparable perioperative outcomes to patients <75 years.

International guidelines for groin hernia management

INTRODUCTION

Worldwide, more than 20 million patients undergo groin hernia repair annually. The many different approaches, treatment indications and a significant array of techniques for groin hernia repair warrant guidelines to standardize care, minimize complications, and improve results. The main goal of these guidelines is to improve patient outcomes, specifically to decrease recurrence rates and reduce chronic pain, the most frequent problems following groin hernia repair. They have been endorsed by all five continental hernia societies, the International Endo Hernia Society and the European Association for Endoscopic Surgery.

METHODS

An expert group of international surgeons (the HerniaSurge Group) and one anesthesiologist pain expert was formed. The group consisted of members from all continents with specific experience in hernia-related research. Care was taken to include surgeons who perform different types of repair and had preferably performed research on groin hernia surgery. During the Group's first meeting, evidence-based medicine (EBM) training occurred and 166 key questions (KQ) were formulated. EBM rules were followed in complete literature searches (including a complete search by The Dutch Cochrane database) to January 1, 2015 and to July 1, 2015 for level 1 publications. The articles were scored by teams of two or three according to Oxford, SIGN and Grade methodologies. During five 2-day meetings, results were discussed with the working group members leading to 136 statements and 88 recommendations. Recommendations were graded as "strong" (recommendations) or "weak" (suggestions) and by consensus in some cases upgraded. In the Results and summary section below, the term "should" refers to a recommendation. The AGREE II instrument was used to validate the guidelines. An external review was performed by three international experts. They recommended the guidelines with high scores. The risk factors for inguinal hernia (IH) include: family history, previous contra-lateral hernia, male gender, age, abnormal collagen metabolism, prostatectomy, and low body mass index. Peri-operative risk factors for recurrence include poor surgical techniques, low surgical volumes, surgical inexperience and local anesthesia. These should be considered when treating IH patients. IH diagnosis can be confirmed by physical examination alone in the vast majority of patients with appropriate signs and symptoms. Rarely, ultrasound is necessary. Less commonly still, a dynamic MRI or CT scan or herniography may be needed. The EHS classification system is suggested to stratify IH patients for tailored treatment, research and audit. Symptomatic groin hernias should be treated surgically. Asymptomatic or minimally symptomatic male IH patients may be managed with "watchful waiting" since their risk of hernia-related emergencies is low. The majority of these individuals will eventually require surgery; therefore, surgical risks and the watchful waiting strategy should be discussed with patients. Surgical treatment should be tailored to the surgeon's expertise, patient- and hernia-related characteristics and local/national resources. Furthermore, patient health-related, life style and social factors should all influence the shared decision-making process leading up to hernia management. Mesh repair is recommended as first choice, either by an open procedure or a laparo-endoscopic repair technique. One standard repair technique for all groin hernias does not exist. It is recommended that surgeons/surgical services provide both anterior and posterior approach options. Lichtenstein and laparo-endoscopic repair are best evaluated. Many other techniques need further evaluation. Provided that resources and expertise are available, laparo-endoscopic techniques have faster recovery times, lower chronic pain risk and are cost effective. There is discussion concerning laparo-endoscopic management of potential bilateral hernias (occult hernia issue). After patient consent, during TAPP, the contra-lateral side should be inspected. This is not suggested during unilateral TEP repair. After appropriate discussions with patients concerning results tissue repair (first choice is the Shouldice technique) can be offered. Day surgery is recommended for the majority of groin hernia repair provided aftercare is organized. Surgeons should be aware of the intrinsic characteristics of the meshes they use. Use of so-called low-weight mesh may have slight short-term benefits like reduced postoperative pain and shorter convalescence, but are not associated with better longer-term outcomes like recurrence and chronic pain. Mesh selection on weight alone is not recommended. The incidence of erosion seems higher with plug versus flat mesh. It is suggested not to use plug repair techniques. The use of other implants to replace the standard flat mesh in the Lichtenstein technique is currently not recommended. In almost all cases, mesh fixation in TEP is unnecessary. In both TEP and TAPP it is recommended to fix mesh in M3 hernias (large medial) to reduce recurrence risk. Antibiotic prophylaxis in average-risk patients in low-risk environments is not recommended in open surgery. In laparo-endoscopic repair it is never recommended. Local anesthesia in open repair has many advantages, and its use is recommended provided the surgeon is experienced in this technique. General anesthesia is suggested over regional in patients aged 65 and older as it might be associated with fewer complications like myocardial infarction, pneumonia and thromboembolism. Perioperative field blocks and/or subfascial/subcutaneous infiltrations are recommended in all cases of open repair. Patients are recommended to resume normal activities without restrictions as soon as they feel comfortable. Provided expertise is available, it is suggested that women with groin hernias undergo laparo-endoscopic repair in order to decrease the risk of chronic pain and avoid missing a femoral hernia. Watchful waiting is suggested in pregnant women as groin swelling most often consists of self-limited round ligament varicosities. Timely mesh repair by a laparo-endoscopic approach is suggested for femoral hernias provided expertise is available. All complications of groin hernia management are discussed in an extensive chapter on the topic. Overall, the incidence of clinically significant chronic pain is in the 10-12% range, decreasing over time. Debilitating chronic pain affecting normal daily activities or work ranges from 0.5 to 6%. Chronic postoperative inguinal pain (CPIP) is defined as bothersome moderate pain impacting daily activities lasting at least 3 months postoperatively and decreasing over time. CPIP risk factors include: young age, female gender, high preoperative pain, early high postoperative pain, recurrent hernia and open repair. For CPIP the focus should be on nerve recognition in open surgery and, in selected cases, prophylactic pragmatic nerve resection (planned resection is not suggested). It is suggested that CPIP management be performed by multi-disciplinary teams. It is also suggested that CPIP be managed by a combination of pharmacological and interventional measures and, if this is unsuccessful, followed by, in selected cases (triple) neurectomy and (in selected cases) mesh removal. For recurrent hernia after anterior repair, posterior repair is recommended. If recurrence occurs after a posterior repair, an anterior repair is recommended. After a failed anterior and posterior approach, management by a specialist hernia surgeon is recommended. Risk factors for hernia incarceration/strangulation include: female gender, femoral hernia and a history of hospitalization related to groin hernia. It is suggested that treatment of emergencies be tailored according to patient- and hernia-related factors, local expertise and resources. Learning curves vary between different techniques. Probably about 100 supervised laparo-endoscopic repairs are needed to achieve the same results as open mesh surgery like Lichtenstein. It is suggested that case load per surgeon is more important than center volume. It is recommended that minimum requirements be developed to certify individuals as expert hernia surgeon. The same is true for the designation "Hernia Center". From a cost-effectiveness perspective, day-case laparoscopic IH repair with minimal use of disposables is recommended. The development and implementation of national groin hernia registries in every country (or region, in the case of small country populations) is suggested. They should include patient follow-up data and account for local healthcare structures. A dissemination and implementation plan of the guidelines will be developed by global (HerniaSurge), regional (international societies) and local (national chapters) initiatives through internet websites, social media and smartphone apps. An overarching plan to improve access to safe IH surgery in low-resource settings (LRSs) is needed. It is suggested that this plan contains simple guidelines and a sustainability strategy, independent of international aid. It is suggested that in LRSs the focus be on performing high-volume Lichtenstein repair under local anesthesia using low-cost mesh. Three chapters discuss future research, guidelines for general practitioners and guidelines for patients.

CONCLUSIONS

The HerniaSurge Group has developed these extensive and inclusive guidelines for the management of adult groin hernia patients. It is hoped that they will lead to better outcomes for groin hernia patients wherever they live. More knowledge, better training, national audit and specialization in groin hernia management will standardize care for these patients, lead to more effective and efficient healthcare and provide direction for future research.

Comparison of peritoneal closure versus non-closure in laparoscopic trans-abdominal preperitoneal inguinal hernia repair with coated mesh

BACKGROUND

Peritoneal closure during laparoscopic trans-abdominal preperitoneal (TAPP) inguinal hernia repair has been the standard of care to prevent bowel obstruction due to adhesions generated by contact with mesh. However, with newer coated meshes, leaving the peritoneal layer open may be safe. While many studies compare methods of peritoneal flap closure, there is a deficit of literature reporting the outcomes of non-closure.

METHODS

A retrospective comparison of peritoneal flap closure versus non-closure during primary laparoscopic TAPP inguinal hernia repair with coated mesh was performed for all patients at Baystate Medical Center meeting inclusion criteria between January 2005 and August 2016. Primary outcome was any procedure-related adverse outcome following repair. Secondary outcomes included operative time, resolution of pre-operative pain and/or gastrointestinal symptoms, and hernia recurrence.

RESULTS

Of 231 patients, 55 (24%) underwent peritoneal flap closure and 176 (76%) underwent non-closure. Demographic, comorbidity, and hernia characteristics were comparable between groups with the exception of obesity (p = 0.01), current smoking status (p = 0.05) and hernia side [p = 0.04 (left), 0.0003 (right)]. Mean operative time was higher in the closure group than non-closure (98.1 ± 37.1 min vs. 76.8 ± 32.9, p < 0.0001). No cases were converted to open. Average follow-up was 21.6 ± 23.8 months. Ninety-three percent of closure patients had documented resolution of pre-operative pain versus 94.0% of non-closure (p = 0.81). The closure group experienced a higher percentage of post-operative complications, though this did not reach significance (5.5 vs. 2.3%; p = 0.36). Compared to the closure group, the non-closure groups experienced similar post-operative pain (3.6 vs. 1.2%; p = 0.24) and recurrence rate (1.8 vs. 4.0%; p = 0.68). There were no bowel obstructions, surgical site infections, unplanned readmissions, or unplanned re-operations.

CONCLUSIONS

Equivalent patient outcomes were seen for both procedure types post-operatively and during follow-up. Operative times were significantly shorter for non-closure patients. Larger study population and longer follow-up is necessary to evaluate true long-term complication rates in flap non-closure.

Our Experience with the Use of Low Cost Mesh in Tension-Free Inguinal Hernioplasty in Northern Ghana

OBJECTIVES

To describe our experience and success in the use of low cost mesh for the repair of inguinal hernias in consenting adult patients.

METHODS

A prospective study was carried out from August 2010 to December 2013 in ten district hospitals across Northern Ghana. The patients were divided into four groups according to Kingsnorth's classification of hernias. Low cost mesh was used to repair uncomplicated groin hernia. Those hernias associated with complications were excluded. We assessed the patients for wound infection, long term incisional pain and recurrence of hernia. The data collected was entered, cleaned, validated and analyzed.

RESULTS

One hundred and eighty-four patients had tension-free repair of their inguinal hernias using non-insecticide impregnated mosquito net mesh. The median age of the patients was 51 years. The male to female ratio was 7:1. Using Kingsnorth's classification, H3 hernias were (62, 33.7%), followed by the H1 group (56, 30.4%). Local anaesthesia was used in 70% and less than 5% had general anaesthesia. The cost of low cost mesh to each patient was calculated to be $ 1.8(GH¢7.2) vs $ 45(GH¢ 180) for commercial mesh of same size. The benefit to the patient and the facility was enormous. Wound hematoma was noticed in 7% while superficial surgical site infection was 3%. No patient reported of long term wound pain. There was no recurrence of hernia.

CONCLUSION

Low cost mesh such as sterilized mosquito net mesh for use in hernioplasty in resource-limited settings is reasonable, acceptable and cost-effective, it should be widely propagated.

FUNDING

None declared.

Inguinal hernia repair among men in relation to occupational mechanical exposures and lifestyle factors: a longitudinal study

OBJECTIVES

To evaluate exposure-response relationships between occupational mechanical exposures and first-time lateral and medial inguinal hernia repair and effects of lifestyle factors. To estimate if occupational mechanical exposures advance the repairs.

METHODS

This longitudinal study was based on a cohort of men aged 18-65 years with questionnaire data from the Musculoskeletal Research Database at the Danish Ramazzini Centre. We estimated occupational mechanical exposures using a job exposure matrix. First-time inguinal hernia repairs from 1998 to 2014 were identified in the Danish Hernia Database. We used Cox regression analyses and calculated excess fractions among the exposed and rate advancement periods (RAPs).

RESULTS

Among 17 967 men, we identified 382 lateral and 314 medial repairs. The risk of lateral repairs increased with time spent standing/walking with an HR of 1.45 (95% CI 1.12 to 1.88) for ≥6 hours/day versus <4 hours/day, corresponding to an excess fraction of cases of 31% in the group with ≥6 hours/day. This group had a RAP of 6.7 (95% CI 2.6 to 10.8) years. Medial repairs were not associated with occupational mechanical exposures. A body mass index ≥30 kg/m² showed lower HRs for both repair types. Leisure-time physical activity and smoking status were not related to any of the outcomes.

CONCLUSIONS

Assuming a causal relationship, the results suggest that around 30% of all first-time lateral inguinal hernia repairs in the highest exposure category would be preventable if the time spent standing/walking could be reduced from ≥6 to <4 hours/day. The repairs might even be postponed by 6-7 years.

Single-Incision Laparoscopic Inguinal Hernioplasty Versus Conventional Laparoscopic Inguinal Hernioplasty

PURPOSE

Additional studies comparing single-incision laparoscopic inguinal hernioplasty (SILH) and conventional laparoscopic inguinal hernioplasty (CLH) have been published, and this study updates the meta-analysis of this subject.

METHODS

Two reviewers independently searched the PubMed, Embase, Google Scholar, and Cochrane Library electronic databases to locate original articles that compared SILH and CLH for inguinal hernia that were published until October 2015. Operative time, conversions, complications, length of hospital stay, recurrence, postoperative pain at 24 hours, and postoperative pain at 7 days were compared using Stata software, version 12.0.

RESULTS

Sixteen studies were selected for this analysis, which included a total of 1672 patients (907 in SILH and 765 in CLH). SILH showed a longer operative time; however, conversions, complications, length of hospital stay, recurrence, postoperative pain at 24 hours, and postoperative pain at 7 days were similar between the 2 groups.

CONCLUSIONS

Our meta-analysis has shown that inguinal hernia repair using SILH is as safe as CLH. However, based on our evidence, we currently believe that SILH is not an efficacious surgical alternative to CLH for inguinal hernias due to the fact that it does not provide significant benefit in postoperative pain and cosmetic outcomes. However, large-scale, well-designed, and multicenter studies will be needed to further confirm the results of this study.

Does peritoneal flap closure technique following transabdominal preperitoneal (TAPP) inguinal hernia repair make a difference in postoperative pain? A long-term quality of life comparison

BACKGROUND

Transabdominal, preperitoneal (TAPP), laparoscopic inguinal hernia repair (IHR) requires the creation of a peritoneal flap (PF) that must be closed after mesh placement. Our previous study indicated that sutured PF closure resulted in less short-term postoperative pain at 2 and 4 weeks compared to tacks and staples. Therefore, the aim of this follow-up study was to compare short-term QOL with a greater sample size and long-term QOL at 2 years by method of PF closure.

MATERIALS AND METHODS

A prospective institutional hernia-specific database was assessed for all adult TAPP IHRs from July 2012 to May 2015. QOL outcomes were compared by PF closure method at 2 and 4 weeks and 6, 12, and 24 months as measured by the Carolinas Comfort Scale. Standard statistical tests were used for the whole population and then the Bonferroni Correction was used to compare groups (p < 0.0167). Multivariate analysis controlling for age, gender, recurrent hernias, and preoperative symptomatic pain was used to compare QOL by PF closure method.

RESULTS

A total of 679 TAPP IHRs in 466 patients were analyzed; 253 were unilateral, and 213 were bilateral. PF closure was performed using tacks in 36.7 %, suture in 24.3 %, and staples in 39.0 %. There was no difference in hernia recurrence (only 1 patient at 36 months). There were no statistical differences in QOL between 2 and 4 weeks and 6- to 24-month follow-up. When resolution of symptoms from preoperative levels was examined, there was no difference in the three groups at any time point (p > 0.05). After controlling for confounding variables on multivariate analysis, there was no difference in QOL by PF closure method at any time point (p > 0.05).

CONCLUSION

Tacked, sutured, and stapled techniques for peritoneal flap closure following TAPP have no significant differences in operative outcomes, postoperative quality of life, or resolution of symptoms.

Abdominal wall hernias-A local manifestation of systemically impaired quality of the extracellular matrix

BACKGROUND

Throughout life, inguinal hernia develops in approximately every fourth man, some of whom develop multiple hernias. If patients at risk of developing multiple hernias could be identified by a serologic biomarker, treatment might be able to be tailored and improved. Evidence suggests that abdominal wall hernia formation is associated with altered collagen metabolism. The aim of this study was to evaluate biomarkers for type IV and V collagen turnover in patients with multiple hernias and control subjects without hernia.

METHODS

Venous blood was collected from 88 men (mean age, 62 years) with a history of more than 3 hernia repairs and 86, age-matched men without hernias. Biomarkers for synthesis of collagen type IV (P4NP) and type V (P5CP) as well as breakdown (C4M and C5M) were measured in serum by validated, solid-phase, competitive assays. Collagen turnover was indicated by the ratio between the biomarker for synthesis and breakdown.

RESULTS

Type IV collagen turnover was 1.4-fold increased in patients with multiple hernias compared to control subjects (P < .001), whereas type V collagen turnover was 1.7-fold decreased (P < .001). Diagnostic power of P5CP was 0.83 (95%C.I.:0.77-0.89), P < .001.

CONCLUSION

Patients with multiple hernias exhibit increased turnover of type IV collagen and a decreased turnover of type V collagen, demonstrating systemically altered collagen turnover. Biomarkers for type V collagen turnover may be used to identify patients at risk for or with multiple hernias.

A genome-wide association study identifies four novel susceptibility loci underlying inguinal hernia

Inguinal hernia repair is one of the most commonly performed operations in the world, yet little is known about the genetic mechanisms that predispose individuals to develop inguinal hernias. We perform a genome-wide association analysis of surgically confirmed inguinal hernias in 72,805 subjects (5,295 cases and 67,510 controls) and confirm top associations in an independent cohort of 92,444 subjects with self-reported hernia repair surgeries (9,701 cases and 82,743 controls). We identify four novel inguinal hernia susceptibility loci in the regions of EFEMP1, WT1, EBF2 and ADAMTS6. Moreover, we observe expression of all four genes in mouse connective tissue and network analyses show an important role for two of these genes (EFEMP1 and WT1) in connective tissue maintenance/homoeostasis. Our findings provide insight into the aetiology of hernia development and highlight genetic pathways for studies of hernia development and its treatment.

Inguinal hernia has high lifetime prevalence, especially in men. This genome-wide association study identifies 4 loci to be associated with inguinal hernia, and shows expression of nearby genes in mouse connective tissues.

Sonographic prevalence of groin hernias and adductor tendinopathy in patients with femoroacetabular impingement

BACKGROUND

Femoroacetabular impingement (FAI) is a common debilitating condition that is associated with groin pain and limitation in young and active patients. Besides FAI, various disorders such as hernias, adductor tendinopathy, athletic pubalgia, lumbar spine affections, and others can cause similar symptoms.

PURPOSE

To determine the prevalence of inguinal and/or femoral herniation and adductor insertion tendinopathy using dynamic ultrasound in a cohort of patients with radiographic evidence of FAI.

STUDY DESIGN

Case series; Level of evidence, 4.

METHODS

This retrospective study consisted of 74 patients (36 female and 38 male; mean age, 29 years; 83 symptomatic hips) with groin pain and radiographic evidence of FAI. In addition to the usual diagnostic algorithm, all patients underwent a dynamic ultrasound examination for signs of groin herniation and tendinopathy of the proximal insertion of the adductors.

RESULTS

Evidence of groin herniation was found in 34 hips (41%). There were 27 inguinal (6 female, 21 male) and 10 femoral (9 female, 1 male) hernias. In 3 cases, inguinal and femoral herniation was coexistent. Overall, 5 patients underwent subsequent hernia repair. Patients with groin herniation were significantly older than those without (33 vs 27 years, respectively; P = .01). There were no significant differences for any of the radiographic or clinical parameters. Tendinopathy of the proximal adductor insertion was detected in 19 cases (23%; 11 female, 8 male). Tendinopathy was coexistent with groin herniation in 8 of the 19 cases. There were no significant differences for any of the radiographic or clinical parameters between patients with or without tendinopathy. Patients with a negative diagnostic hip injection result were more likely to have a concomitant groin hernia than those with a positive injection result (80% vs 27%, respectively). Overall, 38 hips underwent FAI surgery with satisfactory outcomes in terms of score values and subjective improvement.

CONCLUSION

The results demonstrate that groin herniation and adductor insertion tendinopathy coexist frequently in patients with FAI. Although the clinical effect is yet unclear, 5 patients underwent hernia repair. Dynamic ultrasound is a useful tool to detect such pathological abnormalities. Diagnostic hip injections can be helpful to differentiate between the sources of pain.

A nation-wide population-based study of inguinal hernia repair incidence and age-stratified recurrence in an Asian population

PURPOSE

It has been estimated in the UK that 27 % of men and 3 % of women will undergo an inguinal hernia repair (IHR) during their lifetimes. However, no epidemiologic study investigating IHR has been performed to date in an Asian population. The present study explored the incidence and recurrence of IHR in an Asian population using a nation-wide population-based dataset in Taiwan.

METHODS

Based on the National Health Insurance Database, we identified 5806 patients who underwent an IHR between 2000 and 2010 and followed them until they had a recurrence, died during hospitalization, left the program, or the study ended. We calculated the age-stratified recurrence rates and used Cox proportional hazards to explore the influence of demographic and clinical factors on recurrence. We also plotted IHR occurrence over the study period.

RESULTS

Among the 5806 sampled subjects who had an IHR, 565 (9.73 %) had an IHR recurrence yielding an overall incidence of 18.23 per 1000 person-years. The hazard ratios for recurrence increased with age, and were greater among men and blue collar workers. The incidence of IHR decreased from 168.21 to 92.10 per 100,000 person-years over the study period. Surgical complication rates ranged between 0.16 and 2.57 %.

CONCLUSIONS

On account of the increased risk of recurrence with age, young hernia patients may not want to delay surgery. This study detected a decreasing trend in initial IHR rates, confirming similar trends reported in Western countries. However, the incidence of initial IHR is lower in Taiwan than it is in the West.

Relationship between body mass index and the incidence of inguinal hernia repairs: a population-based study in Olmsted County, MN

PURPOSE

The relationship between body mass index (BMI) and the risk of inguinal hernia development is unclear. To explore the relationship, we determined whether the incidence of inguinal hernia repairs (IHR) varied across patients with different BMI categories.

STUDY DESIGN

A population-based incidence study was undertaken. We reviewed all IHR performed on adult residents of Olmsted County, MN from 2004 to 2008. Cases were ascertained through the Rochester Epidemiology Project, a records-linkage system with more than 97% population coverage.

RESULTS

During the study period, a total of 1,168 IHR were performed on 879 men and 107 women. The median BMI of the cohort was 26.7 kg/m2 (range 14.9-58.1, interquartile range 23.9-28.9). Incidence rates varied significantly as a function of BMI (p<0.001). Rates were highest among men who were either normal weight or overweight (419.8 and 421.1 per 100,000 person-years for BMI<25 and BMI 25-29.9, respectively), and lowest for obese and morbidly obese men (273.5 and 99.4 per 100,000 person-years for BMI 30-34.9 and BMI C 35, respectively). Findings were similar across all age categories and in patients who had an IHR that was initial or recurrent, direct or indirect, and unilateral or bilateral.

CONCLUSIONS

The incidence of IHR decreased as BMI increased. Obese and morbidly obese patients had a lower incidence of IHR than those who were normal weight or overweight. The causal mechanisms leading to such a relationship are unclear and warrant further study.

Application of tension-free hernioplasty with hernia meshes of different materials and the postoperative effects on the reproductive function of male rats

This study aimed to compare the effects of polypropylene (PP), lightweight PP (UP) and expanded polytetrafluorethylene (e-PTFE) hernia mesh on the reproductive function of adult male Sprague-Dawley (SD) rats following open tension-free hernioplasty. Forty adult SD rats were obtained and divided into five groups: A sham-operated (FO) group, an e-PTFE mesh group, a PP mesh group, the UP mesh group and a normal control (NC) group (without any surgical manipulation). Ninety days following open tension-free hernioplasty, hematoxylin and eosin staining and immunhistochemistry were used to observe the pathological changes of the testicular tissue and to compare the expression of hypoxia-inducible factor-1α (HIF‑1α) in the rat testis, respectively. ELISA was used to analyze the serum concentration of antisperm antibodies (AsAbs) and routine semen testing was conducted to measure the percentage of grade a+b sperm from the epididymis. More than 50% of mesh adherence to the spermatic cord was observed in the PP and UP groups, and mild or no adhesion was observed in the NC, FO and e-PTFE groups. In the UP and PP groups, marked congestion of necrotic tissue was observed in the seminiferous tubule cavity, a significant reduction in the percentage of grade a+b sperm and a significant increase in the expression levels of AsAbs and HIF-α. It was concluded that the e-PTFE mesh exhibited a marginal effect on the reproductive function of rats compared with that of the PP and UP mesh and is more suitable for tension-free hernioplasty. The clinical significance of these results requires further elucidation with a multi-centered prospective study.