Economics of abdominal wall reconstruction

Computed tomography measurements to predict need for robotic transversus abdominis release: a single institution analysis

PURPOSE

The radiographic rectus width to hernia width ratio (RDR) has been shown to predict ability to close fascial defect without additional myofascial release in open Rives-Stoppa abdominal wall reconstruction (AWR), but it has not been studied in robotic AWR. We aimed to examine various CT measurements to determine their usability in predicting the need for transversus abdominis release (TAR) in robotic AWR.

METHODS

We performed a single-center retrospective review of 137 patients with midline ventral hernias over a 5-year period who underwent elective robotic retrorectus AWR. We excluded patients with M1 or M5 hernias, lateral/flank hernias, and hybrid repairs. The CT measurements included hernia width (HW), hernia width/abdominal width ratio (HW/AW), and RDR. Univariate, multivariate and area under the curve (AUC) analyses were performed.

RESULTS

58/137 patients required TAR (32 unilateral, 26 bilateral). Patients undergoing TAR had a significantly higher average HW and HW/AW and lower RDR. Multivariate analysis revealed that prior hernia repair was independently associated with need for TAR (p = 0.03). ROC analysis and AUC values showed acceptable diagnostic ability of HW, HW/AW and RDR in predicting need for TAR. Cutoffs of RDR ≤ 2, HW/AW > 0.3, and HW > 10 cm yielded high specificity in determining need for any TAR (97.5% vs. 96.2% vs. 92.4%) or bilateral TAR (95.5% vs. 94.6% vs. 92.8%).

CONCLUSION

History of prior hernia repair was a risk factor for robotic TAR. CT measurements have some predictive value in determining need for TAR in robotic AWR. Further prospective analysis is needed in this patient population.

Is surgeon annual case volume related with intra and postoperative complications after ventral hernia repair? Uni- and multivariate analysis of prospective registry-based data

BACKGROUND

Literature on a potential relationship between surgeon case volume and intra- or postoperative complications after ventral hernia repair remains scarce.

METHODS

Patients who underwent ventral hernia repair between 2011 and 2023 were selected from the prospectively maintained French Hernia-Club Registry. Outcome variables were: intraoperative events, postoperative general complications, surgical site occurrences, surgical site infections, length of intensive care unit (ICU), and patient-reported scar bulging during follow-up. Surgeons' annual case volume was categorized as 1-5, 6-50, 51-100, 101-125, and > 125 cases, and its association with outcome volume was evaluated using uni- and multivariable analyses.

RESULTS

Over the study period, 199 titular or temporary members registered 15,332 ventral hernia repairs, including 7869 primary, 6173 incisional, and 212 parastomal hernia repairs. In univariate analysis, surgeons' annual case volume was significantly related with all the postoperative studied outcomes. After multivariate regression analysis, annual case volume remained significantly associated with intra-operative complications, postoperative general complications and length of ICU stay. A primary repair was independently associated with fewer intra- and post-operative complications.

CONCLUSION

In the present multivariable analysis of a large registry on ventral hernia repairs, higher surgeon annual case volume was significantly related with fewer postoperative general complications and a shorter length of stay, but not with fewer surgical site occurrences, nor with less patient-reported scar bulging. Factors in the surgeons' case mix such as the type of hernia have significant impact on complication rates.

Outcomes after open posterior component separation via transversus abdominis release (TAR) for incisional hernia repair. A systematic review and meta-analysis

PURPOSE

Given its potential advantages, open Transversus Abdominis Release (oTAR) has been proposed as a durable solution for complex AWR. However, its applicability in different scenarios remains uncertain. We aimed to analyze the current available evidence and determine surgical outcomes after oTAR.

METHODS

We performed a systematic electronic search on oTAR in PubMed/Medline, Embase, and Cochrane Central Register of Controlled Trials databases. Postoperative morbidity and recurrence rates were included as primary endpoints and Quality of life (QoL) was included as secondary endpoint. A random-effect model was used to generate a pooled proportion with 95% confidence interval (CI) between all studies.

RESULTS

A total of 22 studies with 4,910 patients undergoing oTAR were included for analysis. Mean hernia defect and mesh area were 394 (140-622) cm2 and 1065 (557-2206) cm2, respectively. Mean follow-up was 19.7 (1-32) months. The weighted pooled proportion of recurrence, overall morbidity, surgical site occurrences (SSO), surgical site infection (SSI), surgical site occurrences requiring procedural intervention (SSOPI), major morbidity and mortality were: 6% (95% CI, 3-10%), 34% (95% CI, 26-43%), 22% (95% CI, 16-29%), 11% (95% CI, 8-16%), 4% (95% CI, 3-7%), 6% (95% CI, 4-10%) and 1% (95% CI, 1-2%), respectively. A significant improvement in QoL after oTAR was reported among studies.

CONCLUSION

Open TAR is an effective technique for complex ventral hernias as it is associated with low recurrence rate and a significant improvement in QoL. However, the relatively high morbidity rates observed emphasize the necessity of further patients' selection and optimization to improve outcomes.

Hybrid intraperitoneal onlay mesh repair for incisional hernias: a systematic review and meta-analysis

INTRODUCTION

Laparoscopic IPOM is technically challenging, especially regarding fascial closure. Hybrid repair has been proposed as a simpler approach. We aimed to compare hybrid and laparoscopic intraperitoneal onlay mesh repair (IPOM) in patients undergoing ventral hernia repair (VHR).

METHODS

We performed a systematic review of Cochrane, Scopus, and MEDLINE databases to identify studies comparing hybrid versus laparoscopic IPOM VHR reporting the outcomes of recurrence, mortality, seroma, postoperative complications, reoperation, surgical site infection, and operative time. Statistical analysis was performed using RStudio 4.1.2 using a random-effects model.

RESULTS

We screened 2,896 articles and fully reviewed 22 of them. A total of five studies, encompassing 664 patients were included. Among them, 337 (50.8%) underwent laparoscopic IPOM. All patients had incisional hernias, with a mean diameter varying from 3 to 12.7 cm, 60% were women, with a mean BMI varying from 29.5 to 38. The hybrid approach had a lower rate of seroma when compared to the laparoscopic (OR 0.22; 95% CI 0.05 to 0.92; p = 0.038; I²=78%). We found no difference in recurrence, mortality, postoperative complications, reoperation, surgical site infection, and operative time between groups.

CONCLUSION

Hybrid IPOM is a safe and effective method for incisional hernia repair. Moreover, it facilitates fascial defect closure and decreases postoperative seromas.

The enigma of incisional hernia prediction unraveled: external validation of a prognostic model in colorectal cancer patients

PURPOSE

Accurate prediction of hernia occurrence is vital for surgical decision-making and patient management, particularly in colorectal surgery patients. While a hernia prediction model has been developed, its performance in external populations remain to be investigated. This study aims to validate the existing model on an external dataset of patients who underwent colorectal surgery.

METHODS

The "Penn Hernia Calculator" model was externally validated using the Hughes Abdominal Repair Trial (HART) data, a randomized trial comparing colorectal cancer surgery closure techniques. The data encompassed demographics, comorbidities, and surgical specifics. Patients without complete follow-up were omitted. Model performance was assessed using key metrics, including area under the curve (AUC-ROC and AUC-PR) and Brier score. Reporting followed the TRIPOD consensus.

RESULTS

An external international dataset consisting of 802 colorectal surgery patients were identified, of which 674 patients with up to 2 years follow-up were included. Average patient age was 68 years, with 63.8% male. The average BMI was 28.1. Prevalence of diabetes, hypertension, and smoking were 15.7%, 16.3%, and 36.5%, respectively. Additionally, 7.9% of patients had a previous hernia. The most common operation types were low anterior resection (35.3%) and right hemicolectomy (34.4%). Hernia were observed in 24% of cases by 2-year follow-up. The external validation model revealed an AUC-ROC of 0.66, AUC-PR of 0.72, and a Brier score of 0.2.

CONCLUSION

The hernia prediction model demonstrated moderate performance in the external validation. Its potential generalizability, specifically in those undergoing colorectal surgery, may suggest utility in identifying and managing high-risk hernia candidates.

A Scoping Review of Quality-of-Life Assessments Employed in Abdominal Wall Reconstruction

INTRODUCTION

Surgeons use several quality-of-life instruments to track outcomes following abdominal wall reconstruction (AWR); however, there is no universally agreed upon instrument. We review the instruments used in AWR and report their utilization trends within the literature.

METHODS

This scoping review was reported according to the Preferred Reporting Items for Systematic Reviews and Meta-analysis extension for Scoping Reviews guidelines using the PubMed, Embase, Web of Science, ClinicalTrials.gov, and Cochrane databases. All published articles in the English language that employed a quality-of-life assessment for abdominal wall hernia repair were included. Studies which focused solely on aesthetic abdominoplasty, autologous breast reconstruction, rectus diastasis, pediatric patients, inguinal hernia, or femoral hernias were excluded.

RESULTS

Six hernia-specific tools and six generic health tools were identified. The Hernia-Related Quality-of-Life Survey and Carolinas Comfort Scale are the most common hernia-specific tools, while the Short-Form 36 (SF-36) is the most common generic health tool. Notably, the SF-36 is also the most widely used tool for AWR outcomes overall. Each tool captures a unique set of patient outcomes which ranges from abdominal wall functionality to mental health.

CONCLUSIONS

The outcomes of AWR have been widely studied with several different assessments proposed and used over the past few decades. These instruments allow for patient assessment of pain, quality of life, functional status, and mental health. Commonly used tools include the Hernia-Related Quality-of-Life Survey, Carolinas Comfort Scale, and SF-36. Due to the large heterogeneity of available instruments, future work may seek to determine or develop a standardized instrument for characterizing AWR outcomes.

Nationwide analysis of inpatient laparoscopic ventral hernia repair in Italy from 2015 to 2020

Since 2010, several guidelines and consensus papers have been proposed to support surgeons in the decision-making process (Cuccurullo et al. in Hernia 17(5):557-566, 2013; Silecchia et al. in Surg Endosc 29:2463-2484, 2015; Bittner et al. in Surg Endosc 33(11):3511-3549, 2015) with the conclusion that laparoscopic repair (LR) has gained popularity in the treatment of IH.To date, however, it is not yet clear as to the uptake of LR for IH on national basis. Only dated studies encompassing of all types of incisional hernia repairs are available in literature (Bisgaard et al. in Br J Surg 96:1452-1457, 2009). The aim of our study is to present a snapshot of Italian data for LR of ventral hernias, over a 6 years period, including volume of LR, procedural features and major postoperative outcomes. Data were extracted from the Italian Hospital Information System (HIS) that collects clinical and administrative information regarding each hospital admission of every patient discharged from any hospital in Italy. Using Hospital Discharge records regional Databases (HDD), all laparoscopic ventral hernia procedures carried out in public and private hospitals between 2015 and 2020, in patients over 18 years and resident in Italy, were collected based on diagnosis and procedure codes. The National Agency for Regional Health Services (AgeNaS) oversees the management and analysis of data. All hospital admissions that occurred between 2015 and 2020 were analyzed.A total of 154,546 incisional hernia repairs were performed in Italy from 2015 to 2020. Of these, 20,789 (13.45%) were minimally invasive repairs. The number of procedures performed increased significantly over time, constituting 11.96 and 15.24% of all procedures performed in 2015 and 2020 respectively. However, considering the whole period, the mean annual change was-5.58% (CI - 28.6% to 17.44%; p < 0.0001).Urgent minimally invasive repairs were performed in 1968 cases (1.27%). The absolute rate of laparoscopically treated patients needing an urgent surgical procedure increased overtime (from 7.36% in 2015 to 13.418% in 2020). The mean annual change registered over the whole period was 7.42%. 92% (CI - 0.03 to 14.09%; p < 0.0001). However, when considering the period from 2015 to 2019, the mean annual change was 10.42% (CI 6.35 to 14.49%; p < 0.0001). To our knowledge this is the first nationwide Italian report presenting the national workload of surgical units and the main perioperative features of minimally invasive surgery for ventral hernia repairs.

Drain placement in retromuscular ventral hernia repair: a systematic review and meta-analysis

PURPOSE

Drain placement in retromuscular ventral hernia repair is controversial. Although it may reduce seroma formation, there is a concern regarding an increase in infectious complications. We aimed to perform a meta-analysis on retromuscular drain placement in retromuscular ventral hernia repair.

METHODS

We performed a literature search of Cochrane, Scopus and PubMed databases to identify studies comparing drain placement and the absence of drain in patients undergoing retromuscular ventral hernia repair. Postoperative outcomes were assessed by pooled analysis and meta-analysis. Statistical analysis was performed using RevMan 5.4. Heterogeneity was assessed with I² statistics.

RESULTS

3808 studies were screened and 48 were thoroughly reviewed. Four studies comprising 1724 patients were included in the analysis. We found that drain placement was significantly associated with a decrease in seroma (OR 0.34; 95% CI 0.12-0.96; P = 0.04; I² = 78%). Moreover, no differences were noted in surgical site infection, hematoma, surgical site occurrences or surgical site occurrences requiring procedural intervention.

CONCLUSIONS

Based on the analysis of short-term outcomes, retromuscular drain placement after retromuscular ventral hernia repair significantly reduces seroma and does not increase infectious complications. Further prospective randomized studies are necessary to confirm our findings, evaluate the optimal duration of drain placement, and report longer-term outcomes.

Preoperative Optimization Before Ventral Hernia Repair: A Systematic Review and Meta-analysis

BACKGROUND

Obesity is associated with an increased risk of ventral hernia development and recurrence rates after ventral hernia repair (VHR). The metabolic derangements caused by obesity can also lead to many postoperative complications. Therefore, it is a common practice to attempt weight loss before VHR. However, there is still no consensus on optimal preoperative management for obese patients with a ventral hernia. This study aims to perform a meta-analysis to evaluate the effect of preoperative weight optimization on VHR outcomes.

METHODS

We performed a literature search of PubMed, Scopus, and Cochrane Library databases to identify studies comparing obese patients who underwent surgical or non-surgical weight loss interventions before undergoing hernia repair surgery to obese patients who underwent hernia repair surgery without prehabilitation. Postoperative outcomes were assessed by means of pooled analysis and meta-analysis. Statistical analysis was performed using RevMan 5.4. Heterogeneity was assessed with I 2 statistics.

RESULTS

One thousand six hundred nine studies were screened and 13 were thoroughly reviewed. Five studies comprising 465 patients undergoing hernia repair surgery were included. No differences in hernia recurrence [odds ratio (OR) 0.66; 95% CI 0.23-1.89; P =0.44; I 2 =20%], seroma (OR 0.70; 95% CI 0.25-1.95; P =0.50; I 2 =5%), hematoma (OR 2.00; 95% CI 0.5-7.94; P =0.45; I 2 =0%), surgical site infection (OR 1.96; 95% CI 0.52-7.40; P =0.32; I 2 =0%), and overall complication (OR 0.80; 95% CI 0.37-1.74; P =0.58; I 2 =40%) rates were noted when comparing patients who underwent a preoperative weight loss intervention (prehabilitation or bariatric surgery) versus those who did not. In the subgroup analysis of patients who underwent bariatric surgery, we found no difference in hernia recurrence (OR 0.64; 95% CI 0.12-3.33; P = 0.59; I 2 =41%) or overall complications (OR 1.14; 95% CI 0.36-3.64; P =0.82; I 2 =64%). In the subgroup analysis of patients who lost weight versus patients who did not, there was no significant difference in overall complication rates (OR 0.86; 95% CI 0.34-2.21; P =0.76; I 2 =55%).

CONCLUSIONS

We found similar hernia recurrence, seroma, hematoma, and surgical site infection rates in patients who underwent preoperative optimization. These findings underline the need for prospective studies to define the optimal role of preoperative optimization and weight loss in obese patients undergoing ventral hernia repair.

From transabdominal to totally extra-peritoneal robotic ventral hernia repair: observations and outcomes

PURPOSE

While robotic-assisted hernia repair has increased the popularity of minimally invasive hernia surgery, selecting between the types of approaches is a challenge for both experts and novices alike. In this study, we compared a single surgeon's early experience transitioning from transabdominal hernia repair with sublay mesh in either the pre-peritoneal or retrorectus space (TA-SM) and enhanced-view totally extra-peritoneal (eTEP) ventral hernia repair in the peri-operative and long-term post-operative time periods.

METHODS

We conducted a retrospective review of 50 eTEP and 108 TA-SM procedures to collect demographics, intraoperative details, and 30-day and 1-year post-operative outcomes. Statistical analysis was performed utilizing Chi-square analysis, Fisher's test, and two sample t-tests with equal variances.

RESULTS

There were no significant differences in patient demographics or comorbidities. eTEP patients had larger defects (109.1 cm² vs. 31.8 cm², p = 0.043) and mesh used (432.8 cm² vs. 137.9 cm², p = 0.001). Operative times were equivalent (158.3 ± 90.6 min eTEP and 155.8 ± 65.2 min TA-SM, p = 0.84), but conversion to alternate procedure type was higher for the transabdominal approach (4% eTEP vs. 22% TA-SM, p < 0.05). Hospital stay was less in the eTEP cohort (1.3 days vs. 2.2 days, p < 0.05). Within 30 days, there were no significant differences in emergency visits or hospital readmissions. There was a greater propensity for eTEP patients to develop seromas (12.0% vs. 1.9%, p < 0.05). At 1 year, there was no statistically significant difference in recurrence rate (4.56% eTEP vs. 12.2% TA-SM, p = 0.28) respective to average time to recurrence (9.17 months eTEP vs. 11.05 months TA-SM).

CONCLUSION

The eTEP approach can be adopted safely and efficiently, and may have superior peri-operative outcomes including fewer conversions and reduced hospital stay.

The outcomes of open anterior component separation versus posterior component separation with transversus abdominis release for complex incisional hernias: a systematic review and meta-analysis

PURPOSE

The main objective was to assess the prevalence of hernia recurrence, wound complications (surgical site infections [SSI], seroma and hematoma) and mortality after anterior component separation (ACS) and posterior component separation via transversus abdominis muscle release (PCSTAR) in patients with complex incisional hernias. The so-called complex IH is a serious medical and societal challenge due to its direct and indirect costs; it is also hampered by the use of different surgical techniques, different type of meshes, and different results heterogeneously reported and interpreted. According to actual data, the best approach seems to be a mesh reinforcement component separation procedure augmented or not with an adjuvant technique (preoperative progressive pneumoperitoneum and/or Botulin toxin type A infiltration).

METHODS

A systematic search of four databases (MEDLINE, PubMed, Web of Science, and Google Scholars) was conducted to identify studies reporting on outcomes of component separation techniques and which were published before December 2021. A systematic review and a meta-analysis of postoperative outcomes were performed.

RESULTS

Nineteen studies including 3412 patients (1709 with ACS and 1703 with PCSTAR) were selected. Pooled hernia recurrence rate after a minimum 1-year follow-up was evaluated at 5.15% (odds ratio [OR] 0.68; 95% confidence interval [CI] 0.5-0.9; p = 0.0175). Pooled surgical site infection rate was 10.6% (OR 1.32; 95% CI 1.06-1.65; p = 0.0119). Seroma and hematoma were estimated at 9.75% (OR 1.93; 95% CI 1.52-2.44; p = 0.0001) and 3.83% (OR 1.81; 95% CI 1.26-2.61; p = 0.0012), respectively. ACS was associated with increased wound morbidity, seroma and hematoma. PCSTAR displayed higher recurrence rate (4.27% vs 6.11%).

CONCLUSIONS

PCSTAR was superior to ACS in terms of wound morbidity, surgical site infections, seroma and hematoma incidence. The procedure should be further evaluated in comparative head-to-head randomized controlled trials.

Comparison of two-dimensional measurement with three-dimensional volume rendering for the assessment of loss of domain in incisional hernia patients

PURPOSE

We aimed to compare simple two-dimensional (2D) measurement with comprehensive three-dimensional (3D) volume rendering to determine loss of domain (LOD), a clinically important decision-making feature for incisional hernia repair.

METHODS

In this single-center retrospective study, we analyzed the CT scans of a consecutive cohort of adult patients with a midline incisional hernia. The hernia sac- and abdominal cavity volumes were obtained by two different methods. The 2D method estimated the volumes using the corresponding height, width, and depth. The 3D method comprised of a volume rendering tool. For both methods, LOD was calculated according to the Sabbagh ratio (hernia sac volume / (hernia sac volume + abdominal cavity volume)). Taking the 3D method as the reference standard, the performance of the 2D method was expressed as positive predictive value (PPV) and negative predictive value (NPV) for LOD of more than- and less than 20%. The agreement between both methods was expressed as Cohen's kappa coefficient (kappa).

RESULTS

We analyzed 92 CT scans. Agreement between both methods was high (kappa = 0.854, p = 0.0001); all 67 measurements for which the 2D method assessed LOD to be less than 20% were correctly classified (NPV = 100%), and 20 of 25 measurements for which the 2D method assessed LOD to be more than 20% were correctly classified (PPV = 80%).

CONCLUSIONS

The 2D method can exclude patients from perioperative actions needed for a more complex hernia. Since this method is easy to use and less time-consuming, it seems useful for the routine radiological assessment of LOD in clinical practice.

Open Anterior Component Separation for Complex Incisional and Ventral Hernias—When and How? Case Series Analysis

Closing the midline in patients with incisional hernias is the cornerstone for a functional reconstruction with low morbidity, low recurrence rates, and good cosmetic results, which is the ideal outcome for every hernia surgeon. However, in patients with large hernias (usually over 10 cm width) or in loss of domain cases, this goal is difficult to achieve. Anterior component separation with or without mesh reinforcement has been the procedure of choice for these patients despite its high rate of wound complications. The goal of our study is to evaluate the opportunity and necessity of the anterior component separation in patients with complex incisional or ventral hernias (defects larger than 10 cm, infected meshes). Data of patients with large incisional/ventral hernia operated using anterior component separation technique in the past 10 years were re-visited and analyzed from hospital records between January 2012 and December 2020. Demographic data (age, gender, body mass index, ASA score) and the main steps of the technique were recorded. Data were reported as mean and standard deviation. We used the anterior component separation in 66 cases, mainly for septic conditions (open abdomen, chronic and extended infections of the abdominal wall, chronic-infected meshes). For large parietal defects with aseptic local condition, we used mesh-reinforced anterior component separation (five patients). Mean age was 68.7 years. Among them, 29 patients developed wound complications (hematoma, seroma, infection). Mean hospital stay was 12.6 days. Recurrence was 18% in patients without mesh and zero in patients with mesh reinforcement after a minimum one-year follow-up. Anterior component separation is still a valid procedure in patients with large abdominal defects especially when a septic wound is to be closed. For large parietal defects, if a wide subcutaneous dissection is required, mesh-reinforced anterior component separation remains a valid alternative in abdominal wall reconstruction in certain cases (mainly aseptic conditions).

A simplified method to evaluate the loss of domain

PURPOSE

The treatment of giant incisional hernia (IH) with loss of domain (LOD, IHLD) is considerably challenging due to technical difficulties and subsequent post-operative complications. These post-operative risks may be anticipated by calculating the abdominal cavity (AC) volume (ACV) and the IH volume (IHV) on the preoperative CT-scans, using the AC and IH dimensions (Tanaka's method) or using tridimensional volumetry (Sabbagh's method). These techniques are often time-consuming and require specific softwares. The aim of the present study was to develop a simple method to rapidly obtain the LOD-ratio on the preoperative CT-Scan.

METHODS

The CT-scans (n = 89) of patients with IHLD were retrospectively studied. Several ratios were calculated using different parameters of the AC and the IH, including width, height and depth, the areas (axial and sagittal ellipse, as well as freehand sagittal surface areas) and these were compared with the reference methods of Sabbagh et al. and Tanaka et al. RESULTS: The LOD ratios calculated from the two reference methods gave similar results (ICC = 0.82, p < 0.0001). The new "R-ratios" (Reims-ratios) obtained from the IH and AC surface areas measured using the "freehand ROI" tool on sagittal view or roughly evaluated by an ellipse on axial view showed excellent correlation with both reference ratios (all ICC ≥ 0.71, p < 0.0001).

CONCLUSION

The LOD ratio may be quickly obtained by drawing two circles on the pre-operative CT scan ("R ratios") and available on the webpage https://romeo.univ-reims.fr/Rratio/ . This will certainly help surgeons to routinely anticipate the post-operative complications before IHLD repair.

Truncal function after abdominal wall reconstruction via transversus abdominis muscle release (TAR) for large incisional hernias: a prospective case-control study

BACKGROUND

Data about abdominal wall function in patients with incisional hernias (IH) are limited. Abdominal Wall Reconstruction (AWR) could be beneficial for the improvement of this function. The goal of the study was to evaluate if the abdominal wall function was restored after transversus abdominis muscle release (TAR).

METHODS

We performed a prospective case-control study of 59 patients with IH equal or larger than 10 cm in their width undergoing AWR via TAR with mesh reinforcement and complete linea alba restoration. With two simple physical tests-Trunk Raising (TR) and Double Leg Lowering (DLL), we clinically assessed, preoperatively, 1 month and 1 year postoperatively the functionality of the abdominal wall (flexion). Patients were compared with a control group (n = 57) with an intact abdominal wall undergoing visceral surgery through a midline laparotomy.

RESULTS

There were no differences between the groups in terms of sex and mean age. In the study group, TR demonstrated an increase from 1.93 preoperatively to 2.44 at 1 month and 4.27, respectively, at 1 year postoperatively (p < 0.001). DLL was improved from 2.067 to 4.37 at 1 year postoperatively (p = 0.016). In the control group, surgery resulted in a decrease of truncal flexion. At 1 year postoperatively, the abdominal wall function for study group patients was almost identical with that the functionality of the control group featuring an intact abdominal wall (TR 4.26 vs 4.33 p = 0.532; DLL 4.42 vs 4.21 p = 0.193).

CONCLUSION

AWR via TAR for large IH specifically improved long-term abdominal wall muscular function.

ONLAY VERSUS SUBLAY TECHNIQUES FOR INCISIONAL HERNIA REPAIR: 30-DAY POSTOPERATIVE OUTCOMES

ABSTRACT BACKGROUND: The development of an incisional hernia is a common complication following laparotomy. It also has an important economic impact on healthcare systems and social security budget. The mesh reinforcement of the abdominal wall was an important advancement to increase the success of the repairs and reduce its long-term recurrence. The two most common locations for mesh placement in ventral hernia repairs include the premuscular (onlay technique) and retromuscular planes (sublay technique). However, until now, there is no consensus in the literature about the ideal location of the mesh. AIM: The aim of this study was to compare the two most common incisional hernia repair techniques (onlay and sublay) with regard to the complication rate within the first 30 days of postoperative care. METHOD: This study analyzes 115 patients who underwent either onlay or sublay incisional hernia repairs and evaluates the 30-day postoperative surgical site occurrences and hernia recurrence for each technique. RESULTS: We found no difference in the results between the groups, except in seroma formation, which was higher in patients submitted to the sublay technique, probably due to the lower rate of drain placement in this group. CONCLUSION: Both techniques of mesh placement seem to be adequate in the repair of incisional hernias, with no major difference in surgical site occurrences.

Association between surgical hernia repair techniques and the incidence of seroma: a systematic review and meta-analysis of randomized controlled trials

PURPOSE

Ventral hernia repair (VHR) includes the surgical reconstruction of the abdominal wall (AW) using different surgical techniques. Although such procedures are usually devoid of complications, the formation of seroma may frequently occur. We performed a systematic review to assess the evidence from randomized controlled trials (RCTs) comparing VHR techniques and their impact on seroma formation.

METHODS

We included RCTs having seroma formation as primary endpoint. We included patients of both sexes (age > 18). For data synthesis we applied a random-effects model and calculated risk ratios (RR) with 95% confidence intervals (CI) using the Mantel-Haenszel method. Risk of bias (ROB) and publication bias were evaluated following Cochrane recommendations.

RESULTS

After database search and article screening, 21 records were included in this review. Ten RCTs compared onlay vs. sublay mesh placement techniques. Pooled analysis showed a significantly higher risk ratio for seroma in the onlay cohort (RR = 2.61, 95% CI 1.86-3.66, I² = 0, GRADE quality of evidence, moderate). Five RCTs compared laparoscopic intraperitoneal onlay mesh repair vs. open mesh placement. Pooled analysis showed that seroma formation did not differ significantly between groups (RR = 1.91, 95% CI 0.69-5.28, I² = 66%, GRADE quality of evidence, poor). High ROB was found in all studies and significant publication bias was detected in both meta-analyses.

CONCLUSION

Compared to sublay ventral hernia repair, the onlay procedure is associated with a significantly higher risk of seroma. No significant differences were observed when laparoscopic VHR was compared with the open surgical procedure. Due to the diversity of surgical techniques reported in included RCTs, it is currently not possible to draw conclusive clinical recommendations. Future studies should be standardized to provide detailed data allowing thorough evaluation of the impact of the evidence on clinical practice.

General Surgery: Management of Postoperative Complications Following Ventral Hernia Repair and Inguinal Hernia Repair

Ventral and inguinal hernia repairs are some of the most commonly performed general surgery operations worldwide. This review focuses on the management of postoperative complications, which include surgical site infection, hernia recurrence, postoperative pain, and mesh-related issues. In each section, we aim to discuss classifications, risk factors, diagnostic modalities, and treatment options for common complications following hernia repair.

Evaluation of a Novel Absorbable Mesh in a Porcine Model of Abdominal Wall Repair

Bioabsorbable meshes have seen increasing clinical use to reinforce soft tissue, and exist on a spectrum of strength loss versus absorption: several retain their strength for months, but remain in situ for years. Others lose strength fully by 6 weeks. An intermediate profile, with some strength for 3 -4 months, but consistent absorption in less than a year, may be an optimal balance of near-term support and long-term safety. In this large animal study, we evaluate such a mesh (DuraSorb, SIA), assessing its utility in a porcine model of abdominal wall repair.

METHODS

Two full-thickness defects were created in the abdominal walls of nine Yucatan swine via midline approach and repaired preperitoneally with either DuraSorb or long-lasting control mesh (TIGR, Novus Scientific). At 30 days, 3 months, and 1 year, the implantations were assessed by clinical pathology, post-necropsy histopathology, and burst strength testing.

RESULTS

No device-associated complications were found in vivo, at necropsy, or histologically. DuraSorb was well-integrated and vascularized by 30 days. DuraSorb demonstrated minimal/mild inflammation and fibroplasia, and lower inflammatory scores when compared with TIGR at all time points (P < 0.05). Burst strength of the repair sites was higher than adjacent abdominal wall at all time points (P < 0.05).

CONCLUSIONS

DuraSorb provided durable long-term support, minimal inflammation, and consistent absorption in this porcine model of abdominal wall repair, as compared to a long-term control. Clinical data is needed, but these results suggest that this mesh provides adequate structural support while potentially reducing long-term device reactions.

The incisional hernia epidemic: evaluation of outcomes, recurrence, and expenses using the healthcare cost and utilization project (HCUP) datasets

BACKGROUND

Incisional hernias (IH) following abdominal surgery persist as morbid, costly, and multi-disciplinary surgical challenges. Using longitudinal, multi-state, administrative claims data (HCUP State Inpatient Databases (SID)); (HCUP State Ambulatory Surgery and Services Databases (SASD)), we aimed to characterize the epidemiology, outcomes, recurrence, and costs of IH.

STUDY DESIGN

529,108 patients undergoing abdominal surgery in 2010 across six specialties (colorectal, general/bariatric, hepatobiliary, obstetrics/gynecology, urology, and vascular) were identified within inpatient and ambulatory databases for Florida (FL), Iowa (IA), Nebraska (NE), New York (NY), and Utah (UT). IH repairs, complications, and expenditures were assessed through 2014. Predictive regression modeling was validated using a training set of 1000 bootstrapped repetitions.

RESULTS

16,169 (3.1%) patients developed hernias requiring repair (4.3-year mean follow-up), 3176 (20%) underwent recurrent repair, and 731 (23%) underwent re-recurrent repair. Patients with IH had increased readmissions (6.6 vs. 2.4), morbidity (39 vs. 8% surgical and 22 vs. 7% medical), and costs ($46,000 vs. $25,000) when compared to patients without IH (p < 0.001). IH expenditures totaled $875 million: initial ($687 million), recurrent ($155 million), and re-recurrent hernias ($33 million). IH predominated in colorectal (10%), hepatobiliary (8%), and vascular (5%) procedures. Of 31 significant independent IH risk factors (p < 0.001), obesity, age, smoking, open surgery, and prior surgery were pervasive across surgical specialties.

CONCLUSION

IH represents an unremitting surgical epidemic associated with considerable morbidity, costs, and features consistent with a chronic disease state. We define critical pervasive risk factors (obesity, age, smoking open surgery, and prior surgery) independently associated with IH across surgical disciplines. With failed repairs, subsequent success becomes less likely, increasing morbidity and costs-underscoring the critical importance of optimal treatment and prevention.

The influence of Transversus Abdominis Muscle Release (TAR) for complex incisional hernia repair on the intraabdominal pressure and pulmonary function

Introduction

Among many other techniques for Abdominal Wall Reconstruction (AWR), posterior component separation with Transversus Abdominis Release (TAR), continues to gain popularity and it is increasingly used with promising long-term results. Our goal was to evaluate the influence of TAR with mesh retromuscular reinforcement on the intra-abdominal pressure (IAP) and respiratory function in a series of patients with complex incisional hernias (IH).

Methods

Since November 2014 through February 2019, patients with TAR were identified in the Clinical Department of Surgery database and were retrospectively reviewed. Outcome measures include: demographics, pre- and perioperative details, preoperative and postoperative IAP and plateau pressure (PP).

Results

One-hundred-and-one consecutive TAR procedures (19.7% from all incisional hernia repairs) were analyzed. Mean age was 63 years with a mean Body Mass Index (BMI) of 31.85 kg/m² (25–51). Diabetes and Chronic Obstructive Pulmonary Disease (COPD) were the main major comorbidities. Mean hernia defect area was 247 cm² (104–528 cm²).

Conclusion

TAR is a safe and sound procedure with acceptable modifications of the IAP morbidity and recurrence rate when correctly performed on the right patient.

Ten-year trends in minimally invasive hernia repair: a NSQIP database review

BACKGROUND

Utilization of minimally invasive techniques for ventral and inguinal hernia repairs continues to rise. The purpose of this study was to provide updates on national utilization trends and wound complications of minimally invasive versus open ventral and inguinal hernia repairs.

METHODS

Data were accessed from the 2006 to 2017 National Surgical Quality Improvement Program database. All CPT codes that correlated to laparoscopic and open inguinal and ventral hernia repairs were queried. The total number of cases and wound complications, including superficial surgical site infection (SSI), deep SSI, organ space SSI, and wound dehiscence, was collected for each respective CPT code and compared for each year. IBM SPSS Statistics Software and Microsoft Excel were used to collect and analyze the data.

RESULTS

Between 2009 and 2017, the percentage of minimally invasive inguinal hernia repairs increased from 23.1 to 37.8%, whereas the percentage of minimally invasive ventral hernias only increased from 31.5 to 36.6%. Open inguinal hernia repairs had a wound complication rate ranging from 0.60 to 0.74%, which was double the rate of minimally invasive repairs (0.24 to 0.49%) for nearly each respective year. Minimally invasive ventral hernia repairs had total wound complication rates ranging from 0.91 to 1.37%, whereas open ventral hernias had the highest total wound complication rates ranging from 5.07 to 6.26%.

CONCLUSIONS

Over the last ten years, the utilization of minimally invasive inguinal and ventral hernia repair has increased by nearly two-fold. A larger proportion of this increase has been secondary to minimally invasive inguinal compared to ventral hernia repairs. Wound complications across all techniques remained stable or improved, and remained significantly less in the minimally invasive compared to open approaches. This study highlights the continued growth of minimally invasive techniques in hernia repair over the last decade.

Computed Tomography Image Analysis in Abdominal Wall Reconstruction: A Systematic Review

Ventral hernias are a complex and costly burden to the health care system. Although preoperative radiologic imaging is commonly performed, the plethora of anatomic features present and available in routine imaging are seldomly quantified and integrated into patient selection, preoperative risk stratification, and perioperative planning. We herein aimed to critically examine the current state of computed tomography feature application in predicting surgical outcomes.

Methods

A systematic review was conducted in accordance with the Preferred Reporting Items for a Systematic Review and Meta-Analysis (PRISMA) checklist. PubMed, MEDLINE, and Embase databases were reviewed under search syntax "computed tomography imaging" and "abdominal hernia" for papers published between 2000 and 2020.

Results

Of the initial 1922 studies, 12 papers met inclusion and exclusion criteria. The most frequently used radiologic features were hernia volume (n = 9), subcutaneous fat volume (n = 5), and defect size (n = 8). Outcomes included both complications and need for surgical intervention. Median area under the curve (AUC) and odds ratio were 0.68 (±0.16) and 1.12 (±0.39), respectively. The best predictive feature was hernia neck ratio > 2.5 (AUC 0.903).

Conclusions

Computed tomography feature selection offers hernia surgeons an opportunity to identify, quantify, and integrate routinely available morphologic tissue features into preoperative decision-making. Despite being in its early stages, future surgeons and researchers will soon be able to integrate 3D volumetric analysis and complex machine learning and neural network models to improvement patient care.

How to Develop a Risk Prediction Smartphone App

Purpose. Powered by big data, predictive models provide individualized risk stratification to inform clinical decision-making and mitigate long-term morbidity. We describe how to transform a large institutional dataset into a real-time, interactive clinical decision support mobile user interface for risk prediction. Methods. A clinical decision point ideal for risk stratification and modification was identified. Demographics, medical comorbidities, and operative characteristics were abstracted from the electronic medical record (EMR) using ICD-9 codes. Surgery-specific predictive models were generated using regression modeling and corroborated with internal validation. A clinical support interface was designed in partnership with an app developer, followed by subsequent beta testing and clinical implementation of the final tool. Results. Individual, specialty-specific, and preoperatively actionable models incorporating clustered procedural codes were created. Using longitudinal inpatient, outpatient, and office-based data from a large multicenter health system, all patient and operative variables were weighted according to ß-coefficients. The individual risk model parameters were incorporated into specialty-specific modules and implemented into an accessible iOS/Android compatible mobile application. Conclusions. As proof of concept, we provide a framework for developing a clinical decision support mobile user interface, through the use of clinical and administrative longitudinal data. Point-of-care applications, particularly ones designed with implementation and actionability in mind, have the potential to aid clinicians in identifying and optimizing risk factors that impact the outcome of interest's occurrence, thereby enabling clinicians to take targeted risk-reduction actions. In addition, such applications may help facilitate counseling, informed consent, and shared decision-making, leading to improved patient-centered care.

Dual Tack Mesh Fixation System on a Cadaveric Porcine Model-Creation of a Mesh Fixation System for Hernia Treatment and Prevention

BACKGROUND

Onlay mesh repair (OMR) has proven to be a widely used, simple, and effective technique for treatment and prevention of hernia occurrence. Despite established benefits, there is still a lack of widespread adoption. In this study, we present the Dual Tacker Device (DTD), an enabling technology that directly addresses the limitations to the adoption of OMR, saving surgical time and effort and making OMR more reproducible across a wide range of patients.

METHODS

The DTD mesh fixation system is a semiautomated, hand-held, disposable, multipoint onlay mechanical mesh fixation system that is able to rapidly and uniformly tension and fixate mesh for both hernia treatment and prevention. A cadaveric porcine model was used as a pilot test conducted during a 2 day session to assess the usability of the device and to show that the DTD provided equivalent or superior biomechanical support compared with the standard of care (hand-sewn, OptiFix).

RESULTS

Our study included 37 cadaveric porcine incisional closure abdominal wall models. These were divided into four groups: DTD-mediated OMR (n = 14), hand-sewn OMR (n = 7), OptiFix OMR (n = 9), and suture-only repair (no mesh) (n = 7). Eight surgical residents performed device-mediated and hand-sewn OMR. Average time to completion was fastest in the DTD cohort (45.6s) with a statistically significant difference compared with the hand-sewn cohort (343.1s, P < 0.01). No difference in tensile strength was noted between DTD (195.32N), hand-sewn (200.48N), and OptiFix (163.23N). Discreet hand movements were smallest in the DTD (29N) and significant (P < 0.01) when compared with hand-sewn (202N) and OptiFix (35N).

CONCLUSIONS

The use of the DTD is not only feasible, but demonstrated improvement in time to completion and economy of movement over current standard of care. While more testing is needed and planned, compared with conventional approaches, the DTD represents a robust proof of principle with promising implications for clinical feasibility and adoptability.

Thermo-Responsive Antimicrobial Hydrogel for the In-Situ Coating of Mesh Materials for Hernia Repair

The prophylactic coating of prosthetic mesh materials for hernia repair with antimicrobial compounds is commonly performed before implantation of the mesh in the abdominal wall. We propose a novel alternative, which is a rifampicin-loaded thermo-responsive hydrogel formulation, to be applied on the mesh after its implantation. This formulation becomes a gel in-situ once reached body temperature, allowing an optimal coating of the mesh along with the surrounding tissues. In vitro, the hydrogel cytotoxicity was assessed using rabbit fibroblasts and antimicrobial efficacy was determined against Staphylococcus aureus. An in vivo rabbit model of hernia repair was performed; implanted polypropylene meshes (5 × 2 cm) were challenged with S. aureus (10⁶ CFU), for two study groups—unloaded (n = 4) and 0.1 mg/cm² rifampicin-loaded hydrogel (n = 8). In vitro, antibacterial activity of the hydrogel lasted for 5 days, without sign of cytotoxicity. Fourteen days after implantation, meshes coated with drug-free hydrogel developed a strong infection and resulted in poor tissue integration. Coating meshes with the rifampicin-loaded hydrogel fully prevented implant infection and permitted an optimal tissue integration. Due to its great performance, this, degradable, thermo-responsive antimicrobial hydrogel could potentially be a strong prophylactic armamentarium to be combined with prosthesis in the surgical field.

Can We Predict Incisional Hernia?: Development of a Surgery-specific Decision-Support Interface

OBJECTIVE

The aim of this study was to identify procedure-specific risk factors independently associated with incisional hernia (IH) and demonstrate the feasibility of preoperative risk stratification through the use of an IH risk calculator app and decision-support interface.

SUMMARY BACKGROUND DATA

IH occurs after 10% to 15% of all abdominal surgeries (AS) and remains among the most challenging, seemingly unavoidable complications. However, there is a paucity of readily available, actionable tools capable of predicting IH occurrence at the point-of-care.

METHODS

Patients (n = 29,739) undergoing AS from 2005 to 2016 were retrospectively identified within inpatient and ambulatory databases at our institution. Surgically treated IH, complications, and costs were assessed. Predictive models were generated using regression analysis and corroborated using a validation group.

RESULTS

The incidence of operative IH was 3.8% (N = 1127) at an average follow-up of 57.9 months. All variables were weighted according to β-coefficients generating 8 surgery-specific predictive models for IH occurrence, all of which demonstrated excellent risk discrimination (C-statistic = 0.76-0.89). IH occurred most frequently after colorectal (7.7%) and vascular (5.2%) surgery. The most common occurring risk factors that increased the likelihood of developing IH were history of AS (87.5%) and smoking history (75%). An integrated, surgeon-facing, point-of-care risk prediction instrument was created in an app for preoperative estimation of hernia after AS.

CONCLUSIONS

Operative IH occurred in 3.8% of patients after nearly 5 years of follow-up in a predictable manner. Using a bioinformatics approach, risk models were transformed into 8 unique surgery-specific models. A risk calculator app was developed which stakeholders can access to identify high-risk IH patients at the point-of-care.

When the Mesh Goes Away: An Analysis of Poly-4-Hydroxybutyrate Mesh for Complex Hernia Repair

Mesh reinforcement is a cornerstone of modern ventral hernia repair (VHR); yet, complications with synthetic mesh and cost of biologic have created a need for alternative options. Biosynthetic mesh is a resorbable scaffold that theoretically leverages the benefits and minimizes deficiencies of existing mesh types. This study evaluates 2-year outcomes following poly-4-hydroxybutyrate (P4HB) mesh reinforcement for complex VHR.

Methods

A retrospective review of all consecutive VHR with P4HB (n = 70) was conducted from 2015 to 2018 by a single surgeon. Clinical outcomes, quality of life (QoL; and cost were assessed.

Results

Seventy patients were included with an average age and body mass index of 58.6 years and 33 kg/m², respectively. High-risk comorbidities included hypertension (59%), and smoking history (50%). Cases were primarily modified Ventral Hernia Working Group class 2 (50%), or 3 (36%), with average defect size of 323 cm² (25-972 cm²). P4HB was placed in the retromuscular (80%) or onlay (20%) plane. Mean follow-up was 24 months (12.2-41 months). Hernia recurrence rate was 5.7% (n = 4) and occurred an average of 285 days (209-368 days) post-repair. Of the 21 surgical site occurrences (SSO), 5 (7%) required surgical intervention. A significant improvement in overall QoL (P = 0.001) was noted following repair. Defect size and SSOPI were independently associated with increased direct cost.

Conclusions

P4HB mesh for complex VHR is associated with favorable 2-year clinical outcomes, acceptable hernia recurrence rate, and a significant improvement in QoL. This study supports the use of biosynthetic mesh as an effective biomaterial for complex VHR.

Value Improvement and Resource Utilization in Complex Abdominal Wall Reconstruction

Although recommendations help guide surgeons’ mesh choice in abdominal wall reconstruction (AWR), financial and institutional pressures may play a bigger role. Standardization of an AWR algorithm may help reduce costs and change mesh preferences. We performed a retrospective review of high- and low-risk patients who underwent inpatient AWR between 2014 and 2016. High risk was defined as immunosuppression and/or history of infection/contamination. Patients were stratified by the type of mesh as biologic/biosynthetic or synthetic. These cohorts were analyzed for outcome, complications, and cost. One hundred twelve patients underwent complex AWR. The recurrence rate at two years was not statistically different between high- and low-risk cohorts. No significant difference was found in the recurrence rate between biologic and synthetic meshes when comparing both high- and low-risk cohorts. The average cost of biologic mesh was $9,414.80 versus $524.60 for synthetic. The estimated cost saved when using synthetic mesh for low-risk patients was $295,391.20. In conclusion, recurrence rates for complex AWR seem to be unrelated to mesh selection. There seems to be an excess use of biologic mesh in low-risk patients, adding significant cost. Implementing a critical process to evaluate indications for biologic mesh use could decrease costs without impacting the quality of care, thus improving the overall value of AWR.

Application of ARFI-SWV in Stiffness Measurement of the Abdominal Wall Musculature: A Pilot Feasibility Study

The purpose of this study was to assess the feasibility of acoustic radiation force impulse shear wave velocity and textural features for characterizing abdominal wall musculature and to identify subject-related and technique-related factors that can potentially affect measurements. Median shear wave velocity measurements for the right external abdominal oblique were the same (1.89 ± 0.16 m/s) for both the active group (healthy volunteers with active lifestyles) and the control group (age and body mass index-matched volunteers from an ongoing hernia study). When corrected for thickness, the ratio of right external abdominal oblique shear wave velocity -to-muscle thickness was significantly higher in the control group than in the active volunteers (4.33 s^-1 versus 2.88 s^-1; p value 0.006). From the textural features studied for right external abdominal oblique, 8 features were found to be statistically different between the active and control groups. In conclusion, shear wave velocity is a feasible and reliable technique to evaluate the stiffness of the abdominal wall musculature. Sonographic texture features add additional characterization of abdominal wall musculature.

Role of Prophylactic Mesh Placement for Laparotomy and Stoma Creation

Incisional and parastomal hernias are a cause of significant morbidity and have a substantial effect on quality of life and economic costs for patients and hospital systems. Although many aspects of abdominal hernias are understood, prevention is a feature that is still being realized. This article reviews the current literature and determines the utility of prophylactic mesh placement in prevention of incisional and parastomal hernias.

Prophylactic mesh augmentation: Patient selection, techniques, and early outcomes

BACKGROUND

Incisional hernias (IH) following abdominal surgery are frequent and morbid. Prophylactic mesh augmentation (PMA) has emerged as a technique to reduce IH formation. We aim to report patient selection, techniques and early outcomes after PMA.

METHODS

Retrospective chart review identified descriptive characteristics, risk factors, operative technique, and early post-operative outcomes for PMA patients and matched non-PMA patients between January 1, 2016 and October 31, 2017.

RESULTS

18 consecutive PMA cases were performed (55.6% female, mean age 54.3 years and mean BMI = 29.5 kg/m²). 88.9% of patients had at least two high-risk features for IH. Zero PMA patients developed IH compared to 5.3% non-PMA patients (p = 0.314) (6-months mean follow-up). No difference in surgical site occurrences (SSO) were identified between the two groups.

CONCLUSIONS

Early results are encouraging, demonstrating PMA is safe with equivocal SSO. Further studies are needed to assess if the reduction in IH formation is statistically significant with longer follow-up.

Imaging complex ventral hernias, their surgical repair, and their complications

Abstract

Complex ventral hernia (CVH) describes large, anterior, ventral hernias. The incidence of CVH is rising rapidly due to increasing laparotomy rates in ever older, obese and co-morbid patients. Surgeons with a specific interest in CVH repair are now frequently referring these patients for imaging, normally computed tomography scanning. This review describes what information is required from preoperative imaging and the surgical options and techniques used for CVH repair, so that radiologists understand the postoperative appearances specific to CVH and are aware of the common complications following surgery.

Key Points

• Complex ventral hernia (CVH) describes large abdominal wall hernias (e.g. width ≥10cm).

• CVH patients are being referred increasingly for preoperative and postoperative imaging.

• Imaging is pivotal to characterise preoperative morphology and quantify loss of domain.

• Postoperative imaging appearances are contingent on the surgical methods used for CVH repair.

• Postoperative complications are depicted easily by imaging.

Multicenter review of robotic versus laparoscopic ventral hernia repair: is there a role for robotics?

BACKGROUND

The utilization of robotic platforms for general surgery procedures such as hernia repair is growing rapidly in the United States. A limited amount of data are available evaluating operative outcomes in comparison to standard laparoscopic surgery. We completed a retrospective review comparing robotic and laparoscopic ventral hernia repair to provide safety and outcomes data to help design a future prospective trial design.

METHODS

A retrospective review of 215 patients undergoing ventral hernia repair (142 robotic and 73 laparoscopic) was completed at two large academic centers. Primary outcome measure evaluated was recurrence. Secondary outcomes included incidence of primary fascial closure, and surgical site occurrences.

RESULTS

Propensity for treatment match comparison demonstrated that robotic repair was associated with a decreased incidence of recurrence (2.1 versus 4.2%, p < 0.001) and surgical site occurrence (4.2 versus 18.8%, p < 0.001). This may be because robotic repair was associated with increased incidence of primary fascial closure (77.1 versus 66.7%, p < 0.01). Analysis of baseline patient populations showed that robotic repairs were completed on patients with lower body mass index (28.1 ± 3.6 versus 34.2 ± 6.4, p < 0.001) and fewer comorbidities.

CONCLUSIONS

Our retrospective data show that robotic repair was associated with decreased recurrence and surgical site occurrence. However, the differences noted in the patient populations limit the interpretability of these results. As adoption of robotic ventral hernia repair increases, prospective trials need to be designed in order to investigate the efficacy, safety, and cost effectiveness of this evolving technique.

Using Crowdsourcing as a Platform to Evaluate Lay Perception of Prophylactic Mesh Placement

BACKGROUND

Prophylactic mesh placement (PMP) at the time of open abdominal surgery has gained momentum over the last decade. However, there remains an identifiable gap in the literature regarding patient-reported outcomes and qualitative metrics. In effort to gauge the population's understanding or familiarity with PMP, this study provides an educational framework and uses crowdsourcing as a novel means to assess perception among the general population.

METHODS

A cross-sectional survey study was conducted among the general public to elicit perspectives on PMP. An online crowdsourcing platform was used to capture responses to a questionnaire. Pearson's correlation coefficients, paired t-test, chi-square test, and Fisher's exact tests were performed.

RESULTS

Of 433 respondents, 338 (78.1%) were included. Individuals who had previously undergone surgery and those who had prior hernia repair were more likely to choose PMP than surgically naïve patients (P = 0.06).

CONCLUSIONS

The majority of respondents support the use of PMP. This study contributes to the existing body of literature on PMP and serves as the first qualitative description to gauge the population's perception and understanding of this surgical technique. Within the evolving health care landscape, understanding quality-of-life measures have become increasingly important in defining successful surgical outcomes. Although the data-driven level-I evidence supports the clinical use of PMP, this study intends to establish a framework for future patient-reported outcome studies.

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.

Two cases about mesh adhesion to intra-abdominal cavity tissue after using mesh to repair an incisional hernia

Abdominal incisional hernia is a common postoperative complication. With the development of a new type of surgical anti-adhesion mesh, mesh repair has become a widely-adopted procedure, particularly in the laparoscopic era. However, there were few reports about use of these new meshes to repair incisional hernia in the abdominal cavity. In this report, we present two cases: one a 72-year-old male and the other a 62-year-old female. Both of those patients suffered incisional hernias during abdominal operations, and therefore underwent open incisional hernia anti-adhesion mesh repair operations. Both of them had recurrent incisional hernias after the first repair operation. During the second hernia repair operation via laparoscopy, tissue from the intestine and omentum were found to have adhered seriously to the old meshes, which could cause many serious problems. We need to pay more attention to the issue of adhesion, try to determine possible reasons and improve in our future work.

Development of a Clinically Actionable Incisional Hernia Risk Model after Colectomy Using the Healthcare Cost and Utilization Project

BACKGROUND

Incisional hernia remains a persistent and burdensome complication after colectomy. Through individualized risk-assessment and prediction models, we aimed to improve preoperative risk counseling for patients undergoing colectomy; identify modifiable preoperative risk factors; and encourage the use of evidence-based risk-prediction instruments in the clinical setting.

STUDY DESIGN

A retrospective review of the Healthcare Cost and Utilization Project data was conducted for all patients undergoing either open or laparoscopic colectomy as identified through the state inpatient databases of California, Florida, and New York in 2009. Incidence of incisional hernia repair was collected from both the state inpatient databases and the state ambulatory surgery and services databases in the 3 states between index surgery and 2011. Hernia risk was calculated with multivariable hierarchical logistic regression modeling and validated using bootstrapping techniques. Exclusion criteria included concurrent hernia, metastasis, mortality, and age younger than 18 years. Inflation-adjusted expenditure estimates were calculated.

RESULTS

Overall, 30,741 patients underwent colectomy, one-third of these procedures performed laparoscopically. Incisional hernia repair was performed in 2,563 patients (8.3%) (27-month follow-up). Fourteen significant risk factors were identified, including open surgery (odds ratio = 1.49; p < 0.0001), obesity (odds ratio = 1.49; p < 0.0001), and alcohol abuse (odds ratio = 1.39; p = 0.010). Extreme-risk patients experienced the highest incidence of incisional hernia (19.8%) vs low-risk patients (3.9%) (C-statistic = 0.67).

CONCLUSIONS

We present a clinically actionable model of incisional hernia using all-payer claims after colectomy. The data presented can structure preoperative risk counseling, identify modifiable patient-specific risk factors, and advance the field of risk prediction using claims data.

Does prophylactic mesh placement in elective, midline laparotomy reduce the incidence of incisional hernia? A systematic review and meta-analysis

BACKGROUND

Operative intervention to correct incisional hernia affects 150,000 patients annually, with 1 in 3 repairs recurring within 9 years. The aim of this study was to compare the incidence of incisional hernia and postoperative complications in elective midline laparotomy patients after the use of prophylactic mesh placement and primary suture closure.

METHODS

A systematic review was performed to identify studies comparing prophylactic mesh placement to primary suture closure in elective, midline laparotomy at index abdominal aponeurosis closure. The primary outcome was incisional hernia. Secondary outcomes included postoperative complications.

RESULTS

Fourteen studies were included (2,114 patients), with 1,152 receiving prophylactic mesh placement. Prophylactic mesh placement decreased the risk of incisional hernia overall when compared to primary suture closure (relative risk = 0.15; P < .00001) and in trials using only polypropylene mesh versus 4:1 primary suture closure (relative risk = 0.15; P = .003). Prophylactic mesh placement reduced the risk of incisional hernia regardless of mesh location or composition: onlay (relative risk = 0.07; P < .0001), retrorectus (relative risk = 0.04; P = .002), and preperitoneal (relative risk = 0.18; P = .02). Prophylactic mesh placement increased risk of seroma overall (relative risk = 1.95; P < .0001), onlay (relative risk = 2.43; P = .01) and preperitoneal (relative risk = 1.47; P = .01) but not retrorectus plane (relative risk = 1.55; P = .26). Polypropylene mesh increased seroma risk only in the onlay position (relative risk = 2.77; P = .04). Prophylactic mesh placement patients are at increased risk for chronic wound pain compared to primary suture closure (relative risk = 1.70; P = .03).

CONCLUSION

Prophylactic mesh placement is associated with an 85% postoperative incisional hernia risk reduction when compared to primary suture closure in at-risk patients undergoing elective, midline laparotomy closure. This technique appears to be safe with comparable complication profiles, barring an increased risk of seroma, especially with the onlay technique, and the possibility for an increased risk of chronic pain. Despite this verification, evidence from large domestic trials that sufficiently addresses major knowledge gaps is simply lacking.

Discovery of novel plasma proteins as biomarkers for the development of incisional hernias after midline incision in patients with colorectal cancer: The ColoCare study

BACKGROUND

Ventral incisional hernia is the most common long-term complication after an abdominal operation. Among newly diagnosed colorectal cancer patients, we screened the preoperative plasma proteome to explore predictive markers for the development of an incisional hernia.

METHODS

We utilized preoperative plasma samples of 72 newly diagnosed colorectal cancer patients who underwent midline incision for tumor resection between 2010 and 2013. A total of 21 patients with incisional hernia occurrence were matched with 51 patients with at least 18 months follow-up without an incisional hernia by sex, age, and body mass index. To assess predictive markers of incisional hernia risk, we screened the plasma proteome for >2,000 distinct proteins using a well-validated antibody microarray test. Paired t tests were used to compare protein levels between cases and controls. A gene-set-enrichment analysis (Gene Ontology and Kyoto Encyclopedia of Genes and Genomes) was applied to test for differences in signaling pathways between the 2 groups.

RESULTS

The proteome screen identified 25 proteins that showed elevated or reduced plasma levels in the hernia group compared to the control group (nominal P values < .05). Several proteins were in pathways associated with wound healing (CCL21, SHBG, BRF2) or cell adhesion (PCDH15, CDH3, EPCAM).

CONCLUSION

Our study shows that there are multiple individual and groups of plasma proteins that could feasibly predict the personal hernia risk prior to undergoing an operation. Further investigations in larger, independent sample sets are warranted to replicate findings and validate clinical utility of potential biomarkers. After validation, such a biomarker could be incorporated into a multifactorial risk model to guide clinical decision-making.

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.