Laparoscopic versus open hernia repair: outcomes and sociodemographic utilization results from the nationwide inpatient sample

Numerical modeling of the abdominal wall biomechanics and experimental analysis for model validation

The evaluation of the biomechanics of the abdominal wall is particularly important to understand the onset of pathological conditions related to weakening and injury of the abdominal muscles. A better understanding of the biomechanics of the abdominal wall could be a breakthrough in the development of new therapeutic approaches. For this purpose, several studies in the literature propose finite element models of the human abdomen, based on the geometry of the abdominal wall from medical images and on constitutive formulations describing the mechanical behavior of fascial and muscular tissues. The biomechanics of the abdominal wall depends on the passive mechanical properties of fascial and muscle tissue, on the activation of abdominal muscles, and on the variable intra-abdominal pressure. To assess the quantitative contribution of these features to the development and validation of reliable numerical models, experimental data are fundamental. This work presents a review of the state of the art of numerical models developed to investigate abdominal wall biomechanics. Different experimental techniques, which can provide data for model validation, are also presented. These include electromyography, ultrasound imaging, intraabdominal pressure measurements, abdominal surface deformation, and stiffness/compliance measurements.

Comparison of Medical Research Abstracts Written by Surgical Trainees and Senior Surgeons or Generated by Large Language Models

Importance

Artificial intelligence (AI) has permeated academia, especially OpenAI Chat Generative Pretrained Transformer (ChatGPT), a large language model. However, little has been reported on its use in medical research.

Objective

To assess a chatbot's capability to generate and grade medical research abstracts.

Design, Setting, and Participants

In this cross-sectional study, ChatGPT versions 3.5 and 4.0 (referred to as chatbot 1 and chatbot 2) were coached to generate 10 abstracts by providing background literature, prompts, analyzed data for each topic, and 10 previously presented, unassociated abstracts to serve as models. The study was conducted between August 2023 and February 2024 (including data analysis).

Exposure

Abstract versions utilizing the same topic and data were written by a surgical trainee or a senior physician or generated by chatbot 1 and chatbot 2 for comparison. The 10 training abstracts were written by 8 surgical residents or fellows, edited by the same senior surgeon, at a high-volume hospital in the Southeastern US with an emphasis on outcomes-based research. Abstract comparison was then based on 10 abstracts written by 5 surgical trainees within the first 6 months of their research year, edited by the same senior author.

Main Outcomes and Measures

The primary outcome measurements were the abstract grades using 10- and 20-point scales and ranks (first to fourth). Abstract versions by chatbot 1, chatbot 2, junior residents, and the senior author were compared and judged by blinded surgeon-reviewers as well as both chatbot models. Five academic attending surgeons from Denmark, the UK, and the US, with extensive experience in surgical organizations, research, and abstract evaluation served as reviewers.

Results

Surgeon-reviewers were unable to differentiate between abstract versions. Each reviewer ranked an AI-generated version first at least once. Abstracts demonstrated no difference in their median (IQR) 10-point scores (resident, 7.0 [6.0-8.0]; senior author, 7.0 [6.0-8.0]; chatbot 1, 7.0 [6.0-8.0]; chatbot 2, 7.0 [6.0-8.0]; P = .61), 20-point scores (resident, 14.0 [12.0-7.0]; senior author, 15.0 [13.0-17.0]; chatbot 1, 14.0 [12.0-16.0]; chatbot 2, 14.0 [13.0-16.0]; P = .50), or rank (resident, 3.0 [1.0-4.0]; senior author, 2.0 [1.0-4.0]; chatbot 1, 3.0 [2.0-4.0]; chatbot 2, 2.0 [1.0-3.0]; P = .14). The abstract grades given by chatbot 1 were comparable to the surgeon-reviewers' grades. However, chatbot 2 graded more favorably than the surgeon-reviewers and chatbot 1. Median (IQR) chatbot 2-reviewer grades were higher than surgeon-reviewer grades of all 4 abstract versions (resident, 14.0 [12.0-17.0] vs 16.9 [16.0-17.5]; P = .02; senior author, 15.0 [13.0-17.0] vs 17.0 [16.5-18.0]; P = .03; chatbot 1, 14.0 [12.0-16.0] vs 17.8 [17.5-18.5]; P = .002; chatbot 2, 14.0 [13.0-16.0] vs 16.8 [14.5-18.0]; P = .04). When comparing the grades of the 2 chatbots, chatbot 2 gave higher median (IQR) grades for abstracts than chatbot 1 (resident, 14.0 [13.0-15.0] vs 16.9 [16.0-17.5]; P = .003; senior author, 13.5 [13.0-15.5] vs 17.0 [16.5-18.0]; P = .004; chatbot 1, 14.5 [13.0-15.0] vs 17.8 [17.5-18.5]; P = .003; chatbot 2, 14.0 [13.0-15.0] vs 16.8 [14.5-18.0]; P = .01).

Conclusions and Relevance

In this cross-sectional study, trained chatbots generated convincing medical abstracts, undifferentiable from resident or senior author drafts. Chatbot 1 graded abstracts similarly to surgeon-reviewers, while chatbot 2 was less stringent. These findings may assist surgeon-scientists in successfully implementing AI in medical research.

Emergency umbilical hernia management: scoping review

BACKGROUND

Umbilical hernias, while frequently asymptomatic, may become acutely symptomatic, strangulated or obstructed, and require emergency treatment. Robust evidence is required for high-quality care in this field. This scoping review aims to elucidate evidence gaps regarding emergency care of umbilical hernias.

METHODS

EMBASE, MEDLINE and CENTRAL databases were searched using a predefined strategy until November 2023. Primary research studies reporting on any aspect of emergency umbilical hernia care and published in the English language were eligible for inclusion. Studies were excluded where emergency umbilical hernia care was not the primary focus and subsets of relevant data were unable to be extracted. Two independent reviewers screened abstracts and full texts, resolving disagreements by consensus or a third reviewer. Data were charted according to core concepts addressed by each study and a narrative synthesis was performed.

RESULTS

Searches generated 534 abstracts, from which 32 full texts were assessed and 14 included in the final review. This encompassed 52 042 patients undergoing emergency umbilical hernia care. Most were retrospective cohort designs (11/14), split between single (6/14) and multicentre (8/14) with only one randomized trial. Most multicentre studies were from national databases (7/8). Themes arising included risk assessment (n = 4), timing of surgery (n = 4), investigations (n = 1), repair method (n = 8, four mesh versus suture; four laparoscopic versus open) and operative outcomes (n = 11). The most commonly reported outcomes were mortality (n = 9) and morbidity (n = 7) rates and length of hospital stay (n = 5). No studies included patient-reported outcomes specific to emergency umbilical hernia repair.

CONCLUSION

This scoping review demonstrates the paucity of high-quality data for this condition. There is a need for randomized trials addressing all aspects of emergency umbilical hernia repair, with patient-reported outcomes.

The modified frailty index predicts postoperative morbidity in elective hernia repair patients: analysis of the national inpatient sample 2015-2019

PURPOSE

Frailty has shown promise in predicting postoperative morbidity and mortality following hernia surgery. This study aims to evaluate the predictive capacity of the 11-item modified frailty index (mFI) in estimating postoperative outcomes following elective hernia surgery using the National Inpatient Sample (NIS) database.

METHODS

A retrospective analysis of the NIS from 2015 to 2019 was performed including adult patients who underwent elective hernia repair. The mFI was used to stratify patients as either frail (mFI ≥ 0.27) or robust (mFI < 0.27). The primary outcomes were in-hospital postoperative morbidity and mortality. The secondary outcomes were system-specific morbidity, length of stay (LOS), total in-hospital healthcare cost, and discharge disposition. Univariable and multivariable regressions were utilized.

RESULTS

In total, 14,125 robust patients and 1704 frail patients were included. Frailty was associated with an increased age (mean age 66.4 years vs. 52.6 years, p < 0.001) and prevalence of ventral hernias (51.9% vs. 44.4%, p < 0.001). Adjusted analyses demonstrated that frail patients had increased in-hospital mortality (adjusted odds ratio (aOR) 3.89, 95% CI 1.50, 10.11, p = 0.005), postoperative overall morbidity (aOR 1.98, 95% CI 1.72, 2.29, p < 0.001), postoperative LOS (adjusted mean difference (aMD) 0.78 days, 95% CI 0.51, 1.06, p < 0.001), total in-hospital healthcare costs (aMD $7562 95% CI 3292, 11,832, p = 0.001), and were less likely to be discharged home (aOR 0.61, 95% CI 0.53, 0.69, p < 0.001).

CONCLUSION

The mFI may be a reliable predictor of postoperative morbidity and mortality in elective hernia surgery. Utilizing this tool can aid in patient education and identifying high-risk patients who may benefit from tailored prehabilitation.

Impact of sex on ventral hernia repair outcomes: A systematic review and meta-analysis

BACKGROUND

Given the variability in abdominal physiology and hernia presentation between sexes, better comprehension of sex-related differences in outcomes would tailor surgical approach and counseling regarding postoperative outcomes. This meta-analysis aims to appraise the effect of sex on the outcomes of ventral hernia repair.

METHODS

A literature search in PubMed, EMBASE and Cochrane selected studies comparing outcomes of ventral hernia repair between sexes. Postoperative outcomes were assessed by pooled and meta-analysis. Statistical analysis was performed using RevMan 5.4.

RESULTS

We screened 3128 studies, reviewed 133, and included 18 observational studies, which encompassed 220,799 patients following ventral hernia repair. Postoperative chronic pain was significantly higher in female (OR 1,9; 95% CI 1,64-2,2; p ​< ​0,001). There were no significant differences in complications, readmission, or recurrence rates between females and males.

CONCLUSION

Female sex is associated with a higher risk of postoperative chronic pain following ventral hernia repair.

Mechanical Properties of Smart Polypropylene Meshes: Effects of Mesh Architecture, Plasma Treatment, Thermosensitive Coating, and Sterilization Process

Smart polypropylene (PP) hernia meshes were proposed to detect surgical infections and to regulate cell attachment-modulated properties. For this purpose, lightweight and midweight meshes were modified by applying a plasma treatment for subsequent grafting of a thermosensitive hydrogel, poly(N-isopropylacrylamide) (PNIPAAm). However, both the physical treatment with plasma and the chemical processes required for the covalent incorporation of PNIPAAm can modify the mechanical properties of the mesh and thus have an influence in hernia repair procedures. In this work, the mechanical performance of plasma-treated and hydrogel-grafted meshes preheated at 37 °C has been compared with standard meshes using bursting and the suture pull out tests. Furthermore, the influence of the mesh architecture, the amount of grafted hydrogel, and the sterilization process on such properties have been examined. Results reveal that although the plasma treatment reduces the bursting and suture pull out forces, the thermosensitive hydrogel improves the mechanical resistance of the meshes. Moreover, the mechanical performance of the meshes coated with the PNIPAAm hydrogel is not influenced by ethylene oxide gas sterilization. Micrographs of the broken meshes evidence the role of the hydrogel as reinforcing coating for the PP filaments. Overall, results confirm that the modification of PP medical textiles with a biocompatible thermosensitive hydrogel do not affect, and even improve, the mechanical requirements necessary for the implantation of these prostheses in vivo.

Open preperitoneal ventral hernia repair: Prospective observational study of quality improvement outcomes over 18 years and 1,842 patients

BACKGROUND

This study aimed to describe progressive evidence-based changes in perioperative management of open preperitoneal ventral hernia repair and subsequent surgical outcomes and to analyze factors that affect recurrence and wound complications.

METHODS

Prospective, tertiary hernia center data (2004-2021) were examined for patients undergoing midline open preperitoneal ventral hernia repair with mesh. "Early" (2004-2012) and "Recent" (2013-2021) groups were based on surgery date.

RESULTS

Comparison of Early (n = 675) versus Recent (n = 1,167) groups showed that Recent patients were, on average, older (56.9 ± 12.6 vs 58.7 ± 12.1 years; P < .001) with a lower body mass index (33.5 ± 8.3 vs 32.0 ± 6.8 kg/m²; P = .003) and a higher number of comorbidities (3.6 ± 2.2 vs 5.2 ± 2.6; P < .001). Recent patients had higher proportions of prior failed ventral hernia repair (46.5% vs 60.8%; P < .001), larger hernia defects (199.7 ± 232.8 vs 214.4 ± 170.5 cm²; P < .001), more Center for Disease Control class 3 or 4 wounds (11.3% vs 18.6%; P < .001), and more component separations (22.5% vs 45.7%; P < .001). Hernia recurrence decreased over time (7.1% vs 2.4%; P < .001), as did wound complication rates (26.7% vs 13.2%; P < .001). Comparing respective multivariable analyses (Early versus Recent), wound complications were associated with panniculectomy (odds ratio [95% confidence interval]: 2.9 [1.9-4.5], P < .001 vs 2.1 [1.4-3.3], P < .01), contaminated wounds (2.1 [1.1-3.7], P = .02 vs 1.8 [1.1-3.1], P = .02), anterior component separation technique (1.8 [1.1-2.9], P = .02 vs 3.2[1.9-5.3], P < .01), and operative time (per minute: 1.01 [1.008-1.015], P < .01 vs 1.004 [1.001-1.007], P < .01). Diabetes (2.6 [1.7-4.0], P < .01) and tobacco (1.8 [1.1-2.9], P = .02) were only significant in the early group. In both groups, recurrence was associated with wound complication (8.9 [4.1-20.1], P < .01 vs 3.4 [1.3-8.2]. P < .01) and recurrent hernias (4.9 [2.3-11.5], P < .01 vs 2.1 [1.1-4.2], P = .036).

CONCLUSION

Despite significant increased patient complexity over time, detecting and implementing best practices as determined by recurring data analysis of a center's outcomes has significantly improved patient care results.

Sex disparities in the treatment and outcomes of ventral and incisional hernia repair

BACKGROUND

Despite females accounting for nearly half of ventral and incisional hernia repairs performed each year in the United States, shockingly little attention has been paid to sex disparities in hernia treatment and outcomes. We explored sex-based differences in operative approach and outcomes using a population-level hernia registry.

METHODS

We performed a retrospective review of the Michigan Surgical Quality Collaborative Hernia Registry (MSQC-HR) to identify patients undergoing clean ventral or incisional hernia repair between January 1, 2020 to December 31, 2021. The primary outcomes were risk-adjusted rates of laparoscopic/robotic approach, mesh use, and composite 30-day adverse events stratified by sex. Risk adjustment between sex was performed using all patient, clinical, and hernia characteristics.

RESULTS

5269 patients underwent ventral and incisional hernia repair of whom 2295 (43.6%) patients were female. Mean age was 53.9 (14.5) years. Females had slightly larger hernias (3.5 cm vs. 3.0 cm, P < 0.001), fewer umbilical hernias (50.9% vs. 73.0%, P < 0.001), and a higher prevalence of prior hernia repair (17.9% vs. 13.4%, P < 0.001). In a multivariable logistic regression adjusting for differences between males and females, female sex was associated with lower odds of mesh use [aOR 0.62 (95% CI 0.52-0.74)] and higher odds of laparoscopic/robotic repair [aOR 1.26 (95% CI 1.10-1.44)]. In a similar multivariable model, female sex was also associated with significantly higher odds of composite 30-day adverse events [aOR 1.64 (95% CI 1.32-2.02)]. This equates to predicted probabilities of 11.7% (95% CI 10.3-13.0%) vs. 7.6% (95% CI 6.6-8.6%) for adverse events in females compared to males.

CONCLUSIONS

Despite being younger and having fewer comorbidities, women were more likely to experience adverse events after surgery. Moreover, women were less likely to have mesh placed. Additional work is needed to understand the factors that drive these gender disparities in ventral hernia treatment and outcomes.

Risk Factors Associated With Adverse Outcomes After Ventral Hernia Repair With Component Separation

BACKGROUND

Over 350,000 surgeries are performed for ventral hernias (VHs) annually. Abdominal wall component separation has been more frequently used for the management of VHs. The goal of this study is to better understand factors associated with component separation complication rates.

METHODS

The National Inpatient Sample (2005-2014) was used to identify all patients with an International Classification of Diseases ninth Revision diagnosis of VHs who underwent open VH repair with a pedicleor graft advancement flap. All cases included in this study were elective and not associated with additional procedures. Demographic, clinical, and hospital characteristics were extracted. Independent predictors of complications and outcomes were determined by multivariable regression analysis.

RESULTS

Component separation was performed in 4346 patients. Mean age was 56; majority were female (55%) and white (80%). Most patients (73%) underwent surgery in an urban teaching hospital; mesh was used in 80% of cases and 11% were smokers. Hypertension was the most common comorbidity (50%), followed by obesity (26%), diabetes mellitus (DM) (23%), coronary artery disease (11%), and chronic obstructive pulmonary disease (COPD) (8%). Half of the patients (50%) had private insurance, and 35% had Medicare. Patients were distributed equally over household income quartiles. The mortality rate was 0.5%; median length of stay was 5 d. Overall complication rate was 25% (wound 11%, intraoperative 5%, infectious 11%, and pulmonary 8%). Mesh was associated with a lower rate of wound complications (10% versus 15%, P = 0.001). On multivariable analysis, patients with COPD (odds ratio: 2.02; 95% confidence interval: 1.58-2.59), obesity (1.37; 1.16-1.63), DM (1.3; 1.09-1.55), and those in the lowest income quartile (1.44; 1.06-1.96) had higher overall complication rates.

CONCLUSIONS

Consistent with other studies, patients with COPD, Obesity, DM, and lower income status were associated with increased complications after component separation.

Post-operative pain after laparoscopic ventral hernia repair, the impact of mesh soakage with bupivacaine solution versus normal saline solution: A randomised controlled trial (HAPPIEST Trial)

Background and Aims:

Early postoperative pain after laparoscopic ventral hernia repair remains a concern for patients. Local application of anaesthetic agent in the surgical dissection area can potentially overcome this problem. The objective of this study was to evaluate the impact of soaking mesh in 0.5% bupivacaine solution as compared to normal saline solution on the post-operative pain.

Methodology:

We conducted a parallel-design double-blind randomised controlled trial. Adult patients with uncomplicated ventral abdominal wall hernias were included in the trial. Mesh was soaked in 0.5% solution of bupivacaine before application in patients in the intervention arm, whereas it was soaked in normal saline solution for patients in the control arm. Post-operative pain was assessed by trained staff at 6 h and 24 h from surgery. It was graded on visual analogue scale (VAS) from 0 to 10.

Results:

Trial was conducted from 16 November, 2015, to 15 September, 2017. During the study period, a total of 114 patients were randomised. Nine patients were excluded after randomisation. A total of 55 patients were analysed in the intervention arm and 50 patients were analysed in the control arm. Mean pain score at VAS at 6 h after laparoscopic ventral hernia repair in the intervention arm was 5.05 ± 1.2, whereas in the control arm, it was 5.54 ± 1.1 and the difference was statistically significant (P = 0.03-independent sample t-test). Mean pain score at VAS at 24 h after laparoscopic ventral hernia repair in the intervention arm was 3.16 ± 1.2, whereas in the control arm, it was 3.58 ± 1.4 and the difference was not statistically significant (P = 0.11-independent sample t-test).

Conclusion:

Soakage of mesh in 0.5% bupivacaine solution before application in laparoscopic ventral hernia repair significantly reduces early post-operative pain.

Trial Registration: Trial was registered with clinicaltrials. gov (NCT03035617)

URL: https://clinicaltrials. gov

Appropriate patient selection facilitates safe discharge from the PACU after laparoscopic ventral hernia repair: an analysis of the AHSQC database

BACKGROUND

The postoperative management of patients undergoing laparoscopic ventral hernia repair (VHR) remains relatively unknown. The purpose of our study was to determine if patient and hernia-specific factors could be used to predict the likelihood of hospital admission following laparoscopic VHR using the Americas Hernia Society Quality Collaborative (AHSQC) database.

METHODS

All patients who underwent elective, laparoscopic VHR with mesh placement from October 2015 through April 2019 were identified within the AHSQC database. Patients without clean wounds, those with chronic liver disease, and those without 30-day follow-up data were excluded from our analysis. Patient and hernia-specific variables were compared between patients who were discharged from the post-anesthesia care unit (PACU) and patients who required hospital admission. Comparisons were also made between the two groups with respect to 30-day morbidity and mortality events.

RESULTS

A total of 1609 patients met inclusion criteria; 901 (56%) patients were discharged from the PACU. The proportion of patients discharged from the PACU increased with each subsequent year. Several patient comorbidities and hernia-specific factors were found to be associated with postoperative hospital admission, including older age, repair of a recurrent hernia, a larger hernia width, longer operative time, drain placement, and use of mechanical bowel preparation. Patients who required hospital admission were more likely than those discharged from the PACU to be readmitted to the hospital within 30 days (4% vs. 2%, respectively) and to experience a 30-day morbidity event (18% vs. 8%, respectively).

CONCLUSIONS

Patient- and hernia-specific factors can be used to identify patients who can be safely discharged from the PACU following laparoscopic VHR. Additional studies are needed to determine if appropriate patient selection for discharge from the PACU leads to decreased healthcare costs for laparoscopic VHR over the long-term.

Postoperative Quality of Life after Open Transinguinal Preperitoneal Inguinal Hernia Repair Using Memory Ring or Three-dimensional Devices

A transinguinal preperitoneal (TIPP) approach has become a common technique for inguinal hernia repair. Our goal was to compare the impact of the two mesh designs for this operation: a flat mesh with a memory ring device (MRD) or a three-dimensional device (3DD) containing both onlay and preperitoneal mesh components. The prospective International Hernia Mesh Registry (2007 to 2012) was queried for MRD and 3DD inguinal hernia repairs. Outcomes and patient quality of life (QOL), using the Carolinas Comfort Scale (CCS), were examined at 1, 6, 12, and 24 months. Standard statistical methods were used, and multivariate logistic regression was performed using a forward stepwise selection method. TIPP was performed in 956 patients. Their average age 57.4 ± 15.3 years, 94.0 per cent were male, and mean body mass index was 25.7 ± 3.2 kg/m2. MRD was used in 131 and 3DD in 825. Follow-up was 97, 82, 87, and 80 per cent at 1, 6, 12, and 24 months, respectively. Complications were not significantly different ( P > 0.05). Recurrence was 0.8 per cent for MRD and 2.1 per cent for 3DD ( P = 0.45). Comparing patient outcomes of MRD with 3DD at 1 month, 18.9 versus 11.5 per cent had symptoms of mesh sensation ( P = 0.02); 28.7 versus 14.8 per cent had movement limitations ( P < 0.01). MRD use was a significant independent predictor of movement limitation (odds ratio, 2.3; confidence interval, 1.4 to 3.7). No significant differences in CCS scores were seen at 6, 12, and 24 months. TIPP repair is safe and has a low recurrence rate. Early postoperative QOL is significantly improved with a 3DD mesh compared with MRD.

How I Do It: Laparoscopic Ventral Hernia Repair

More than 350,000 ventral hernias are repaired annually in the United States. Currently, there is significant variation in all aspects of ventral hernia management, from preoperative patient selection to postoperative care. Herein, we detail our perioperative evaluation and management of patients selected for laparoscopic ventral hernia and our surgical technique for the performance of laparoscopic ventral hernia repair.

Robotic-assisted and laparoscopic hernia repair: real-world evidence from the Americas Hernia Society Quality Collaborative (AHSQC)

BACKGROUND

Ventral hernia repair (VHR) is a commonly performed procedure and is especially prevalent in patients who have undergone previous open abdominal surgery: up to 28% of patients who have undergone laparotomy will develop a ventral hernia. There is increasing interest in robotic-assisted VHR (RVHR) as a minimally invasive approach to VHR not requiring myofascial release and in RVHR outcomes relative to outcomes associated with laparoscopic VHR (LVHR). We hypothesized real-world evidence from the Americas Hernia Society Quality Collaborative (AHSQC) database will indicate comparable clinical outcomes from RVHR and LVHR approaches not employing myofascial release.

METHODS

Retrospective, comparative analysis of prospectively collected data describing laparoscopic and robotic-assisted elective ventral hernia repair procedures reported in the multi-institutional AHSQC database. A one-to-one propensity score matching algorithm identified comparable groups of patients to adjust for potential selection bias that could result from surgeon choice of repair approach.

RESULTS

Matched data describe preoperative characteristics and perioperative outcomes in 615 patients in each group. The following significant differences were observed among the 11 outcomes that were pre-specified. Operative time tended to be longer for the RVHR group compared to the LVHR group (p < 0.001). Length of stay differed between the two groups; while both groups had a median length of stay of 0, stay lengths tended to be longer in the LVHR group (p < 0.001). Rates of conversion to laparotomy were fewer for the RVHR group: < 1% and 2%, respectively (p = 0.007). Through 30 days, there were fewer RVHR patient-clinic visits (p = 0.038).

CONCLUSION

Both RVHR and LVHR perioperative results compare favorably with each other in most measures. Differences favored RVHR in terms of shorter LOS, fewer conversions to laparotomy, and fewer postoperative clinic visits; differences favored LVHR in terms of shorter operative times.

Current practice patterns for initial umbilical hernia repair in the United States

PURPOSE

The approach to repairing an initial umbilical hernia (IUH) varies substantially, and this likely depends on hernia size, patient age, sex, BMI, comorbidities including diabetes mellitus, and surgeon preference. Of these, only hernia size has been widely studied. This cross-sectional study aims to look at the practice pattern of umbilical hernia repair in the United States.

METHODS

A retrospective study was performed using data from the America Hernia Society Quality Collaborative. Patient characteristics included age, sex, hernia width, BMI, smoking status, and diabetes. Outcomes were use of mesh for repair, as well as surgical approach (open vs minimally invasive). Multivariate logistic regression was performed to assess the independent effect of age, sex, hernia width, BMI, smoking status, and diabetes on use of mesh and approach to repair.

RESULTS

3475 patients were included. 74% were men. Mesh use was more common in men (67% vs 60%, P < 0.001). Mesh was used in 33% of repairs ≤ 1 cm, and 82% of repairs > 1 cm (P < 0.001). Younger patients were less likely to receive a mesh repair (54% if age ≤ 35 vs 67% for age > 35, P < 0.001). However, on multivariate analysis, mesh use was associated with increasing hernia width (OR 5.474, 95% CI 4.7-6.3) as well as BMI (OR 1.8, 95% CI 1.5-2.1) but not with age or sex.

CONCLUSION

The majority of IUH are performed open. Patient BMI and hernia defect size contribute to choice of surgical technique including use of mesh. The use of mesh in 33% of hernias below 1 cm demonstrates a gap between evidence and practice. Patient factors including patient age and sex had no impact on operative approach or use of mesh.

Open retromuscular versus laparoscopic ventral hernia repair for medium-sized defects: where is the value?

PURPOSE

There is increasing emphasis on value in health care, defined as quality over cost required to deliver care. We analyzed outcomes and costs of repairing medium-sized ventral hernias to identify whether an open retromuscular or laparoscopic intraperitoneal onlay approach would provide superior value to the patient and healthcare system.

METHODS

A retrospective analysis of prospectively collected data from the Americas Hernia Society Quality Collaborative was performed for patients undergoing clean, elective repair of ventral hernias between 4 and 8 cm in width at our institution between 4/2013 and 12/2016 for whom at least 1-year follow-up was available. Recurrence rates, wound complications, length of stay, patient-reported outcomes, and perioperative costs were compared.

RESULTS

One hundred and eighty-six patients met criteria (105 open, 81 laparoscopic) with 93.5% having ≥ 2-year follow-up. Patients undergoing laparoscopic repair had higher BMI, lower ASA classification, slightly lower prevalence of recurrent hernias and less prior mesh utilization, and slightly smaller hernias. Length of stay was shorter in the laparoscopic group (median 1 vs. 3 days, p < 0.001), without increased readmissions. Recurrence rates, wound complications, and patient-reported outcomes were similar. Laparoscopic repair had higher up-front surgical costs, yet equivalent total perioperative costs.

CONCLUSION

Both laparoscopic and open approaches for elective repair of medium-sized ventral hernias offer similar clinical outcomes, patient-reported outcomes, and total perioperative costs. Laparoscopic repair appears to offer superior value based on a significantly reduced postoperative length of stay.

Guidelines for treatment of umbilical and epigastric hernias from the European Hernia Society and Americas Hernia Society

BACKGROUND

Umbilical and epigastric hernia repairs are frequently performed surgical procedures with an expected low complication rate. Nevertheless, the optimal method of repair with best short- and long-term outcomes remains debatable. The aim was to develop guidelines for the treatment of umbilical and epigastric hernias.

METHODS

The guideline group consisted of surgeons from Europe and North America including members from the European Hernia Society and the Americas Hernia Society. The Grading of Recommendations, Assessment, Development and Evaluation (GRADE) approach, the Scottish Intercollegiate Guidelines Network (SIGN) critical appraisal checklists, and the Appraisal of Guidelines for Research and Evaluation (AGREE) instrument were used. A systematic literature search was done on 1 May 2018, and updated on 1 February 2019.

RESULTS

Literature reporting specifically on umbilical and epigastric hernias was limited in quantity and quality, resulting in a majority of the recommendations being graded as weak, based on low-quality evidence. The main recommendation was to use mesh for repair of umbilical and epigastric hernias to reduce the recurrence rate. Most umbilical and epigastric hernias may be repaired by an open approach with a preperitoneal flat mesh. A laparoscopic approach may be considered if the hernia defect is large, or if the patient has an increased risk of wound morbidity.

CONCLUSION

This is the first European and American guideline on the treatment of umbilical and epigastric hernias. It is recommended that symptomatic umbilical and epigastric hernias are repaired by an open approach with a preperitoneal flat mesh.

Hybrid: Evolving techniques in laparoscopic ventral hernia mesh repair

Introduction

Laparoscopic repair is now the treatment of choice for most cases of ventral/incisional hernia. Although the technique has undergone many refinements, there is no standard technique for difficult or complicated hernias.

Aim

The aim of this study was to show the different innovative methods used to treat difficult ventral hernia through hybrid techniques.

Materials and Methods

A total of 75 (n = 75) patients underwent Laparoscopic Ventral Hernia Hybrid Mesh Repair (LVHHMR) by our surgical unit between January 2014 and December 2016. Three different techniques of repairing the defects were used. Mesh fixation time, post-operative pain score (visual analogue score) and follow-up for pain and recurrence (at 6 months, 12 months and 24 months) were recorded and analysed.

Results

Out of 75 patients (20 men and 55 women), the median age was 45 years and body mass index of the patients was 25-35. Types of hernias operated were paraumbilical hernias, incisional and recurrent hernias. The techniques used were (1) laparoscopic adhesiolysis, open sac excision with closure of defect and laparoscopic mesh placement, (2) laparoscopic adhesiolysis, omphalectomy with closure of defect and laparoscopic mesh placement and (3) open adhesiolysis, sac excision with closure of defect and laparoscopic mesh placement. Five patients required analgesics for 48 h. No patients complained of pain at follow-ups (1 month, 6 months, 12 months and 24 months). Mean hospital stay postoperatively was 2-3 days.

Conclusion

LVHHMR is safe and feasible approach for complicated/difficult ventral hernias. However, further larger studies are required to establish these methods as gold standard.

Variations in Nationwide Readmission Patterns after Umbilical Hernia Repair

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

Laparoscopic ventral hernia repair with intraperitoneal onlay mesh-results from a general surgical unit

BACKGROUND

Symptomatic ventral herniation is a common clinical presentation. The treatment, whether elective or as an emergency, can be difficult and a variety of surgical repairs are utilised. Intraperitoneal onlay mesh (IPOM) involves the placement of a reinforcing prosthesis, usually supported by primary closure of the defect. Intra-abdominal adhesions have been highlighted as a potential complication in utilising this form of mesh placement. Several methods of laparoscopic mesh placement outside of the peritoneal cavity are gaining prominence as potential alternatives to IPOM.

AIMS

This study reviews our experience with IPOM in the repair of ventral hernia by a single surgical team.

METHODS

A prospectively maintained electronic database of all laparoscopic ventral hernia repair (LVHR) performed within the study period was analysed and reported. Follow-up questionnaires were sent to patients to follow long-term outcomes.

RESULTS

One hundred eight patients underwent LVHR over a 7-year period. Demographics demonstrated an obese patient group (BMI 30.89 ± 4.9 kg/m²), with a variety of hernia sizes and morphologies. Hernia recurrence was found in two patients (1.8%). Twenty-nine (26.8%) patients suffered a complication, but only eight (7.4%) of those required intervention beyond pharmacotherapy. Two patients required mesh explantation.

CONCLUSIONS

IPOM for the general surgeon is a relatively safe and effective method of repairing ventral hernias, with a low recurrence rate.

Deciding on Optimal Approach for Ventral Hernia Repair: Laparoscopic or Open

BACKGROUND

The decision to perform laparoscopic or open ventral hernia repair (VHR) is multifactorial. This study evaluates the impact of operative approach, BMI, and hernia size on outcomes after VHR.

STUDY DESIGN

The International Hernia Mesh Registry was queried for VHR (2007-2017). A predictive algorithm was constructed, factoring the impact of BMI, hernia size, age, sex, diabetes, and operative approach on outcomes.

RESULTS

Of the 1,906 VHRs, 58.8% were performed open, patient mean age was 54.9 ± 13.5 years, BMI was 31.2 ± 6.8 kg/m², and defect area was 44.8 ± 88.1 cm². Patients undergoing open VHRs were more likely to have an infection develop (3.1% vs 0.3%; p < 0.0001), but less likely to have a seroma develop (6.8% vs 15.3%; p < 0.0001) at mean follow-up 23.2 ± 12.0 months. With multivariate regression controlling for confounding variables, patients undergoing laparoscopic VHR had increased risk of seroma (odds ratio [OR] 1.78; 95% CI 1.05 to 3.03), a decreased risk of infection (OR 0.05; 95% CI 0.01 to 0.42), and had worse quality of life at 1, 6, 12, and 24 months postoperatively compared with patients undergoing open repair. Recurrent hernias were associated with subsequent recurrence (OR 2.69; 95% CI 1.24 to 5.81) and need for reoperation (OR 4.93; 95% CI 2.24 to 10.87). Multivariate predictive models demonstrated independent predictors of infection, including open approach, recurrent hernias, and low ratio of BMI to defect size.

CONCLUSIONS

Ideal outcomes are dependent on both patient and operative factors. Open repair in thin patients with large defects should be considered due to reduced complications and improved quality of life. Laparoscopic repair in obese patients and recurrent hernias can decrease the associated risk of infection.

Incisional Hernia in the United States: Trends in Hospital Encounters and Corresponding Healthcare Charges

Incisional hernia (IH) is a challenging, potentially morbid condition. This study evaluates recent trends in hospital encounters associated with IH care in the United States. Using Nationwide Inpatient Sample databases from 2007 to 2011, annual estimates of IH-related hospital discharges, charges, and serious adverse events were identified. Significance in observed trends was tested using regression modeling. From 2007 to 2011, there were 583,054 hospital discharges associated with a diagnosis of IH. 81.1 per cent had a concurrent procedure for IH repair. The average discharge included a female patient (63.2%), 59.8 years of age, with either Medicare (45.3%) or Private insurance (38.3%) as the anticipated primary payer. Comparing 2007 to 2011, significant increases in IH discharges (12%; 2007 = 109,702 vs 2011 = 123,034, P = 0.009) and IH repairs (10%; 2007 = 90,588 vs 2011 = 99,622, P < 0.001) were observed. This was accompanied by a 37 per cent increase in hospital charges (2007 = $44,587 vs 2011 = $60,968, P < 0.001), resulting in a total healthcare bill of $7.3 billion in 2011. Significant trends toward greater patient age (2007 = 59.7 years vs 2011 = 60.2 years, P < 0.001), higher comorbidity index (2007 = 3.0 vs 2011 = 3.5, P < 0.001), and increased frequency of serious adverse events (2007 = 13.5% vs 2011 = 17.7%, P < 0.001) were noted. Further work is needed to identify interventions to mitigate the risk of IH development.

A nationwide evaluation of robotic ventral hernia surgery

BACKGROUND

The purpose of this study was to examine outcomes of robotic ventral hernia repair(RVHR) versus laparoscopic ventral hernia repair(LVHR).

METHODS

The Nationwide Inpatient Sample was queried from October 2008 to December 2013 for ventral hernia repairs. Demographics, morbidity, mortality, and charges were compared between RVHR and LVHR.

RESULTS

From 2008-2013, 149,622 ventral hernia surgeries were identified; 117,028 open, 32,243 laparoscopic, and 351 robotic. Open repairs were excluded. RVHR rose annually with 2013 containing 47.9% of all RVHRs. RVHR patients were more likely to be older and have more chronic conditions. There was no difference between length of stay. Pneumonia rates were higher with RVHR; however, after controlling for confounding variables, there was no difference in pneumonia rates. Mortality and other major complications were similar. Total charges were increased for RVHR in univariate and multivariate analysis. RVHR was more common in teaching hospitals and wealthier zip codes.

CONCLUSION

RVHR demonstrates comparable safety to the laparoscopic technique, with increased charges and increased volume in urban teaching hospitals and patients from areas of higher median income.

Laparoscopic versus open incisional hernia repair: a retrospective cohort study with costs analysis on 269 patients

PURPOSE

To compare clinical outcomes and institutional costs of elective laparoscopic and open incisional hernia mesh repairs and to identify independent predictors of prolonged operative time and hospital length of stay (LOS).

METHODS

Retrospective observational cohort study on 269 consecutive patients who underwent elective incisional hernia mesh repair, laparoscopic group (N = 94) and open group (N = 175), between May 2004 and July 2014.

RESULTS

Operative time was shorter in the laparoscopic versus open group (p < 0.0001). Perioperative morbidity and mortality were similar in the two groups. Patients in the laparoscopic group were discharged a median of 2 days earlier (p < 0.0001). At a median follow-up over 50 months, no difference in hernia recurrence was detected between the groups. In laparoscopic group total institutional costs were lower (p = 0.02). At Cox regression analysis adjusted for potential confounders, large wall defect (W3) and higher operative risk (ASA score 3-4) were associated with prolonged operative time, while midline hernia site was associated with increased hospital LOS. Open surgical approach was associated with prolongation of both operative time and LOS.

CONCLUSIONS

Laparoscopic approach may be considered safely to all patients for incisional hernia repair, regardless of patients' characteristics (age, gender, BMI, ASA score, comorbidities) and size of the wall defect (W2-3), with the advantage of shorter operating time and hospital LOS that yields reduced total institutional costs. Patients with higher ASA score and large hernia defects are at risk of prolonged operative time, while an open approach is associated with longer duration of surgical operation and hospital LOS.

Feasibility of laparoscopic abdominal wall reconstruction in an outpatient community-hospital setting using cPTFE prosthetic mesh: a prospective, multicenter case series

Objective

This study investigated the use of prosthetic condensed polytetrafluoroethylene (cPTFE) for laparoscopic ventral hernia repair (LVHR) in an outpatient community-hospital setting.

Methods

Patients underwent LVHR with cPTFE at one of three community hospitals. Primary endpoint was hernia recurrence at 1-year postoperatively. Secondary endpoints included pain, surgical site infection, medical/surgical complications, and patient-reported outcomes.

Results

This study included 65 females and 52 males, aged 46.6 ± 13.2 years (mean ± SD; range 18–84 years). Mean prosthetic size was 413.8 ± 336.11 cm² (range 165–936 cm²). Mean follow-up was 30 months (range 12–46 months). Hernia recurrence rate was 4.3%. Rate of hospitalization in the first postoperative week was 2.6%. Early and late secondary endpoint complication rates were 24.8% and 27.4%, respectively; pain was the most common complication, followed by seroma (8.5%).

Conclusions

Outpatient LVHR using cPTFE is feasible in community hospitals. Complication rates were similar to previous reports, and the seroma rate was markedly lower.

Umbilical hernia in patients with liver cirrhosis: A surgical challenge

Umbilical hernia occurs in 20% of the patients with liver cirrhosis complicated with ascites. Due to the enormous intraabdominal pressure secondary to the ascites, umbilical hernia in these patients has a tendency to enlarge rapidly and to complicate. The treatment of umbilical hernia in these patients is a surgical challenge. Ascites control is the mainstay to reduce hernia recurrence and postoperative complications, such as wound infection, evisceration, ascites drainage, and peritonitis. Intermittent paracentesis, temporary peritoneal dialysis catheter or transjugular intrahepatic portosystemic shunt may be necessary to control ascites. Hernia repair is indicated in patients in whom medical treatment is effective in controlling ascites. Patients who have a good perspective to be transplanted within 3-6 mo, herniorrhaphy should be performed during transplantation. Hernia repair with mesh is associated with lower recurrence rate, but with higher surgical site infection when compared to hernia correction with conventional fascial suture. There is no consensus on the best abdominal wall layer in which the mesh should be placed: Onlay, sublay, or underlay. Many studies have demonstrated several advantages of the laparoscopic umbilical herniorrhaphy in cirrhotic patients compared with open surgical treatment.

The increased cost of ventral hernia recurrence: a cost analysis

PURPOSE

Over 300,000 ventral hernia repairs (VHRs) are performed each year in the US. We sought to assess the economic burden related to ventral hernia recurrences with a focused comparison of those with the initial open versus laparoscopic surgery.

METHODS

The Premier Alliance database from 2009 to 2014 was utilized to obtain patient demographics and comorbid indices, including the Charlson comorbidity index (CCI). Total hospital cost and resource expenses during index laparoscopic and open VHRs and subsequent recurrent repairs were also obtained. The sample was separated into laparoscopic and open repair groups from the initial operation. Adjusted and propensity score matched cost outcome data were then compared amongst groups.

RESULTS

One thousand and seventy-seven patients were used for the analysis with a recurrence rate of 3.78 %. For the combined sample, costs were significantly higher during recurrent hernia repair hospitalization ($21,726 versus $19,484, p < 0.0001). However, for index laparoscopic repairs, both the adjusted total hospital cost and department level costs were similar during the index and the recurrent visit. The costs and resource utilization did not go up due to recurrence, even though these patients had greater severity during the recurrent visit (CCI score 0.92 versus 1.06; p = 0.0092). Using a matched sample, the total hospital recurrence cost was higher for the initial open group compared to laparoscopic group ($14,520 versus $12,649; p = 0.0454).

CONCLUSIONS

Based on our analysis, need for recurrent VHR adds substantially to total hospital costs and resource utilization. Following initial laparoscopic repair, however, the total cost of recurrent repair is not significantly increased, as it is following initial open repair. When comparing the initial laparoscopic repair versus open, the cost of recurrence was higher for the prior open repair group.

Ventral and incisional hernia: the cost of comorbidities and complications

INTRODUCTION

Ventral and incisional hernia repair (VIHR) is among the most frequently performed abdominal operations with significant incidence of postoperative complications and readmissions. Payers are targeting increased "value" of care through improved outcomes and reduced costs. Cost data in clinically relevant terms is still rare. This study aims to identify hospital costs associated with clinically relevant factors in order to facilitate strategies by surgeons to enhance the value of VIHR.

METHODS

An IRB-approved retrospective review of VIHRs performed at the University of Kentucky from April 2009 through September 2013 was conducted. NSQIP clinical data and hospital cost data were matched. Operating room (ORC), total encounter (TEC), and 90-day postdischarge (90PDC) hospital costs were analyzed relative to clinical variables using non-parametric tests.

RESULTS

In total 385 patients that underwent VIHR during the time period were included in the analyses. Considering all VIHRs, median [interquartile range (IQR)] ORC was $6900 ($5600-$10,000); TEC was $10,700 ($7500-$18,600); and 90PDC was $0 ($0-$800). Compared to all VIHRs, ASA Class ≥ 3 was associated with increased ORC and TEC (p < .001), and 90PDC (p < .01). Preoperative open wound was associated with increased ORC and TEC (p < .001). Numerous operative variables were associated with both increased ORC and TEC. Wound Class > 1 was associated with increased ORC and TEC (p < .001) and 90PDC (p < .01). Inpatient occurrence of any complication was associated with increased TEC and 90PDC (p < .001).

CONCLUSIONS

ASA Class ≥ 3, Wound Class > 1, open abdominal wound, and postoperative complications significantly increase costs. Although the hospital encounter represents the majority of the cost associated with VIHR, additional costs are incurred during the 90-day postoperative period. An appreciation of global costs is essential in developing alternative payment models for hernia in order to provide the greatest value in hernia care.

Quality of Life and Surgical Outcome 1 Year After Open and Laparoscopic Incisional Hernia Repair: PROLOVE: A Randomized Controlled Trial

OBJECTIVE

Patients suffering from an incisional hernia after abdominal surgery have an impaired quality of life (QoL). Surgery aims to improve QoL with a minimum risk of further complications. The aim was to analyze QoL, predictors for outcome, including recurrence and reoperation rates during the first postoperative year.

METHODS

In a randomized controlled trial comparing laparoscopic and open mesh repair, 133 patients were assessed preoperatively and after 1 year with regard to QoL using the Short Form-36 (SF-36), visual analog scale (pain, movement limitation, and fatigue), and questions addressing abdominal wall complaints. Factors concerning recurrence, reoperations, satisfaction, and improved QoL were analyzed.

RESULTS

A total of 124 patients remained for analysis. All SF-36 scores except mental composite score increased, reaching and maintaining levels of the Swedish norm already after 8 weeks with no difference between groups. Event-free recovery was seen in 85% in the laparoscopic group and in 65% of the open cases (P < 0.010). Five recurrences occurred after laparoscopic surgery and 1 in the open group (P < 0.112). Overall, abdominal wall complaints decreased from 82% to 13% of the patients; and 92% were satisfied with the result after 1 year.In univariable logistic regression analyses laparoscopic surgery and male sex predicted an event-free recovery. Obesity (BMI > 30) predicted better outcome with regard to QoL. No predictors for recurrence or satisfaction were identified.

CONCLUSIONS

Patients with incisional hernia benefit substantially from surgery concerning QoL, independent of surgical technique. An event-free recovery occurred frequently after laparoscopic surgery. SF-36 seems well suited for assessing surgical outcome in patients after incisional hernia repair.

Insulin dependence as an independent predictor of perioperative morbidity after ventral hernia repair: a National Surgical Quality Improvement Program analysis of 45,759 patients

BACKGROUND

Although diabetes mellitus has been identified as a predictor of perioperative morbidity after ventral hernia repair (VHR), it is unclear whether insulin-dependent diabetes mellitus (IDDM) and non-insulin-dependent diabetes mellitus (NIDDM) confer the same degree of risk. We examined the variable effect of IDDM and NIDDM on 30-day medical and surgical complications after VHR.

METHODS

We performed a retrospective analysis of patients in the National Surgical Quality Improvement Program database from 2005 to 2012 undergoing VHR. After perioperative variable comparison, regression analysis was performed to determine whether IDDM and/or NIDDM independently predicted increased complications after proper risk adjustment.

RESULTS

A total of 45,759 patients were identified to have undergone VHR. Of these, 38,026 patients (83.1%) were not diabetic, 5,252 (11.5%) were NIDDM patients, and 2,481 (5.4%) were IDDM patients. After controlling for other risk factors, we found that IDDM independently predicted increased rates of overall, surgical, and medical complications (odds ratio, 1.284, 1.251, 1.263, respectively) in open repair. IDDM independently predicted increased overall and medical complications (odds ratio, 1.997, 1.889, respectively) but not surgical complications in laparoscopic repair. NIDDM was not significantly associated with any complication type in either procedure type.

CONCLUSIONS

Our present study suggests that much of the perioperative risk associated with diabetes is attributable to IDDM. The effect of IDDM on laparoscopic and open repair is subtly different. IDDM demonstrates increased overall and medical complications in laparoscopic repair and increased overall, medical, and surgical complications in open repair. Of note, IDDM does not independently predict increased risk for surgical complications in laparoscopic repair.