Predictors of incisional hernia in adult liver transplant recipients

Significance of Specimen Extraction Site in Minimizing Hernia Risk After Distal Pancreatectomy

BACKGROUND

Incisional hernia (IH) results in significant morbidity to patients and financial burden to healthcare systems. We aimed to determine the incidence of IH in distal pancreatectomy (DP) patients, stratified by specimen extraction sites.

METHOD

Imaging in DP patients in our institution from 2016 to 2021 were reviewed by radiologists blinded to the operative approach. Specimen extraction sites were stratified as upper midline/umbilical (UM) versus Pfannenstiel. IH was defined as fascial defect on postoperative imaging. Patients without preoperative and postoperative imaging were excluded.

RESULTS

Of the 219 patients who met our selection criteria, the median age was 64 years, 54% were female, and 64% were White. The majority were minimally invasive (MIS) procedures (n = 131, 60%), of which 52% (n = 64) had a UM incision for specimen extraction, including 45 hand-assist and 19 purely laparoscopic procedures. MIS with Pfannenstiel incisions for specimen extraction was 48% (n = 58), including 44 robotic and 14 purely laparoscopic procedures. Mean follow-up time was 16.3 months (standard deviation [SD] 20.8). Follow-up for MIS procedures with UM incisions was 16.6 months (SD 21.8) versus 15.5 months (SD 18.6) in the Pfannenstiel group (p = 0.30). MIS procedures with UM incisions for specimen extraction had a 17.8 times increase in odds of developing an IH compared with MIS procedures with Pfannenstiel extraction sites (p = 0.01). The overall odds of developing an IH increased by 4% for every month of follow-up (odds ratio 1.04; p < 0.001).

CONCLUSION

A Pfannenstiel incision should be performed for specimen extraction in cases with purely laparoscopic or robotic distal pancreatectomy, when feasible.

Evaluation of Induction Immunosuppression and Risk of Incisional Hernia After Liver Transplantation

INTRODUCTION

Liver transplantation (LT) is a technically complex operation and usually performed on ill patients. A major postoperative morbidity is incisional hernia, occurring in 9.5%-32.4% of cases. There are mixed results in transplant studies regarding potential risk factors. Additionally, the literature is lacking in the relationship between specific immunosuppressive induction agents administered during LT and postoperative incisional hernia.

METHODS

A single center, retrospective cohort study of patients who underwent primary LT between 4/2011-1/2018 was conducted. Clinical variables including demographics and comorbidities were reviewed. The primary end point was the development of an incisional hernia following LT. Sub analysis was performed for secondary end points to determine potential risk factors, including immunosuppressive induction agent.

RESULTS

Overall, 418 patients met inclusion criteria. At 5 y post-LT, there were 66/271 (24.4%) and 53/147 (36.1%) patients diagnosed with an incisional hernia in the methylprednisolone and basiliximab groups, respectively. After propensity score matching, there was no difference in incisional hernia development between induction agents, P = 0.19. For patients with body mass index ≥30 and postoperative seroma of the abdominal wall, the hazard ratios were 2.67 (95% CI = 1.7, 4.3) and 2.03 (95% CI = 1.1, 3.9), respectively.

CONCLUSIONS

Incisional hernia rate after LT was 28.5% at 5 y. Our analysis found that immunosuppressive induction agent at LT was not associated with the development of postoperative incisional hernia. However, preoperative obesity (body mass index ≥30) and postoperative seroma of the abdominal wall were potential risk factors. Further studies are needed to delineate if these risk factors remain across institutions and in alternative settings.

The causal association between body fat distribution and risk of abdominal wall hernia: a two-sample Mendelian randomization study

PURPOSE

Obesity and a high body mass index (BMI) are considered as risk factors for abdominal wall hernia (AWH). However, anthropometric measures of body fat distribution (BFD) seem to be better indicators in the hernia field. This Mendelian randomization analysis aimed to generate more robust evidence for the impact of waist circumstance (WC), body, trunk, arm, and leg fat percentages (BFP, TFP, AFP, LFP) on AWH.

METHODS

A univariable MR design was employed and the summary statistics allowing for assessment were obtained from the genome-wide association studies (GWASs). An inverse variance weighted (IVW) method was applied as the primary analysis, and the odds ratio value was used to evaluate the causal relationship between BFD and AWH.

RESULTS

None of the MR-Egger regression intercepts deviated from null, indicating no evidence of horizontal pleiotropy (p > 0.05). The Cochran Q test showed heterogeneity between the genetic IVs for WC (p = 0.005; p = 0.005), TFP (p < 0.001; p < 0.001), AFP-L (p = 0.016; p = 0.015), LFP-R (p = 0.012; p = 0.009), and LFP-L (p < 0.001; p < 0.001). Taking the IVW random-effects model as gold standard, each standard deviation increment in genetically determined WC, BFP, TFP, AFP-R, AFP-L, LFP-R, and LFP-L raised the risk of AWH by 70.9%, 70.7%, 56.5%, 69.7%, 78.3%, 87.7%, and 72.5%, respectively.

CONCLUSIONS

This study proves the causal relationship between AWH and BFD, attracting more attention from BMI to BFD. It provides evidence-based medical evidence that healthy figure management can prevent AWH.

Risk factors for incisional hernia after liver transplantation in the era of mammalian target of rapamycin inhibitors use: a retrospective study of living donor liver transplantation dominant center in Korea

Purpose

Incisional hernia (IH) is a common complication after liver transplantation (LT) with an incidence rate of 5% to 46%. This retrospective study aimed to evaluate the risk factors for IH development after LT in the era of mammalian target of rapamycin (mTOR) inhibitors use.

Methods

Data on patients who underwent LT between 2015 and 2021 were retrospectively reviewed. The patients were divided into 2 groups (IH group and non-IH group) according to the postoperative occurrence of IH.

Results

We analyzed data from 878 patients during the study period, with 28 patients (3.2%) developing IH. According to multivariate analysis, body mass index exceeding 25 kg/m2 and the use of mTOR inhibitors within the first month after LT were the sole significant factors for both IH occurrence and the subsequent need for repair operations. Notably, a history of wound complications, a Model for End-stage Liver Disease score, and the timing of LT-whether conducted during regular hours or at night-did not emerge as significant risk factors for IH after LT.

Conclusion

Our study reveals a higher incidence of IH among obese patients following LT, often requiring surgical repair, particularly in cases involving mTOR inhibitor usage within the initial month after LT. Consequently, it is crucial to exercise increased vigilance, especially in obese patients, and exercise caution when considering early mTOR inhibitor administration after LT.

Outcomes of a Large Series of Laparoscopic Ventral Hernia Repairs after Liver Transplantation

BACKGROUND

The hernia defects that develop in liver transplant recipients tend to be complex. Unfortunately, there is a paucity of data to guide post-transplant hernia management. Our goal was to evaluate the outcomes following laparoscopic ventral hernia repair (LVHR) in liver transplant recipients.

METHODS

A retrospective review of a prospectively kept database of liver transplant patients at a single tertiary healthcare facility was completed. All patients between 2007 and 2020 who underwent LVHR for a hernia at their transplant incision site were included. The primary outcome studied was hernia recurrence. Secondary outcomes included time-to-hernia repair, complications, and length of stay (LOS).

RESULTS

There were 89 patients who met inclusion criteria. 82% were male, mean age was 60 years, and mean body mass index was 30.2 kg/m2. 94.4% were on tacrolimus and 36% on mycophenolate mofetil. Median time-to-hernia repair was 16 months with a mean mesh size of 743 cm2 and length of stay of 3.7 days. None required conversion to an open operation. Postoperative complications included ileus (20.2%), acute kidney injury (11.2%), pneumonia (6.7%), and bleeding requiring re-operation (1.1%). Hernia-related complications included chronic suture site pain (1.1%), seroma requiring intervention (3.3%), surgical site infection (3.3%), nonoperative mesh infection (1.1%), and mesh infection requiring explantation (1.1%). Median follow-up was 23 months. Hernia recurrence occurred in 4.5% and no predictive variables for recurrence were identified.

CONCLUSIONS

Although the hernia defects that develop in liver transplant recipients are complex and their comorbidities significant, LVHR can safely and effectively repair these defects with low rates of recurrence and complications.

Incisional Hernia Following Open Pancreaticoduodenectomy: Incidence and Risk Factors at a Tertiary Care Centre

(1) Background: Incisional hernia (IH) is one of the most common complications following open abdominal surgery. There is scarce evidence on its real incidence following pancreatic surgery. The purpose of this study is to evaluate the incidence and the risk factors associated with IH development in patients undergoing pancreaticoduodenectomy (PD). (2) Methods: We retrospectively reviewed all patients undergoing PD between 2014 and 2020 at our centre. Data were extracted from a prospectively held database, including perioperative and long-term factors. We performed univariate and multivariate analysis to detect those factors potentially associated with IH development. (3) Results: The incidence of IH was 8.8% (19/213 patients). Median age was 67 (33-85) years. BMI was 24.9 (14-41) and 184 patients (86.4%) underwent PD for malignant disease. Median follow-up was 23 (6-111) months. Median time to IH development was 31 (13-89) months. Six (31.5%) patients required surgical repair. Following univariate and multivariate analysis, preoperative hypoalbuminemia (OR 3.4, 95% CI 1.24-9.16, p = 0.01) and BMI ≥ 30 kg/m2 (OR 2.6, 95% CI 1.06-8.14, p = 0.049) were the only factors independently associated with the development of IH. (4) Conclusions: The incidence of IH following PD was 8.8% in a tertiary care center. Preoperative hypoalbuminemia and obesity are independently associated with IH occurrence following PD.

Outcomes of Ventral Hernia Repair After Orthotopic Liver Transplant Using Component Separation and Onlay Biologic Mesh

INTRODUCTION

The management of ventral hernias (VHs) after orthotopic liver transplant (OLT) can be uniquely challenging because of immunosuppression coupled with large laparotomy size that can compromise the quality of the abdominal wall. The component separation with multipoint suture onlay acellular dermis fixation technique has proven to be effective in high-risk abdominal wall reconstructions. The goal of this study was to elucidate the factors that affect safety and efficacy of VH repair in post-OLT patients.

METHODS

A retrospective review of 345 patients who underwent repair of VH with compartment separation and onlay acellular dermal matrix reinforcement from a single surgeon from 2012 to 2020 was conducted. Of these, 27 patients were identified with a history of OLT and were stratified based on whether the defect was a initial or recurrent hernia repair. The majority of patients had a standard chevron incision (70%). Data abstraction was performed for preoperative risk factors, hernia characteristics, surgical site complications, and postoperative course including hernia recurrence.

RESULTS

A majority of cases in the study period were initial hernia repairs (59%) with no significant differences in the patient demographics and size of VH defects (190 ± 112.69 cm 2 ). Comorbidities were similar between the groups with the exception of a significantly higher baseline creatinine levels and higher history of smoking in the recurrent hernia repair group ( P < 0.05). Of the 27 cases, there were no demonstrable hernia recurrences noted and an overall 11% complication rate. Univariate analysis noted a statistically significant difference in surgical site complication rate ( P = 0.017), with the initial hernia repair group having the lowest rate of surgical site complications.

CONCLUSIONS

In complex post-OLT patients with large VH, modified component separation with onlay acellular mesh was shown to have acceptable medium-term results. Further studies investigating the factors leading to postoperative complications are necessary to reduce recurrence in this evolving patient population.

Prevention of Incisional Hernia after Open Hepato-Pancreato-Biliary Surgery: A Systematic Review

INTRODUCTION

Most hepato-pancreato-biliary (HPB) procedures are still performed through open approach. Incisional hernia (IH) is one of the most common complications after open surgery. To date, published data on IH after HPB surgery are scarce; therefore, the aim of this study was to assess the current evidence regarding incidence, risk factors, and prevention.

METHODS

Medline/PubMed (1946-2020), EMBASE (1947-2020), and the Cochrane library (1995-2020) were searched for studies on IH in open HPB surgery. Animal studies, editorials, letters, reviews, comments, short case series and liver transplant, laparoscopic, or robotic procedures were excluded. The protocol was registered with PROSPERO (CRD42020163296).

RESULTS

A total of 5,079 articles were retrieved. Eight studies were finally included for the analysis. The incidence of IH after HPB surgery ranges from 7.7% to 38.8%. The identified risk factors were body mass index, surgical site infection, ascites, Mercedes or reversed T incisions, and previous IH. Prophylactic mesh might be safe and effective.

CONCLUSIONS

IH after open HPB surgery is still an important matter. Some of the risk factors are specific for the HPB operations and the incision type should be carefully considered. Randomized controlled trials are required to confirm the role of prophylactic mesh after HPB operations.

Is the incision type important for the development of hernia in liver transplant patients?

OBJECTIVE

In this study, we aimed to investigate the rates and causes of incisional hernia that developed in the postoperative follow-up of patients who underwent liver transplantation.

MATERIAL AND METHOD

The results of patients who underwent LT by using three different incisions at the İstanbul Yeni Yüzyıl University Gaziosmanpaşa Hospital organ transplant center between January 2015 and December 2019 were retrospectively analyzed. Patients were divided into Chevron (group-1), reverse T (group-2), and J incisions (group-3) and hernia development rates were examined.

RESULTS

There was no significant difference in terms of incisional hernia in groups 1 and 2 according to the incision type (p = .723). Incisional hernia rate was significantly lower in the J incision group (p < .001). When the factors that increase the development of hernia in all LT patients were examined, it was seen that male gender (p = .021), high BMI rate (p = .003), postoperative bleeding (p = .018), and wound infection (p = .039) caused a significant increase in risk.

CONCLUSION

The incision, which is made during liver transplant, is important for the development of hernia. The J incision has a low hernia development rate without causing access problems. Regardless of the incision, high BMI index, male gender, postoperative bleeding, and wound infection increase the development of incisional hernia in liver transplant patients.

Peritoneal flap hernioplasty for repair of incisional hernias after orthotopic liver transplantation

Background

Repair of incisional hernias following orthotopic liver transplantation (OLT) is a surgical challenge due to concurrent midline and transverse abdominal wall defects in the context of lifelong immunosuppression. The peritoneal flap hernioplasty addresses this problem by using flaps of the hernial sac to bridge the fascial gap and isolate the mesh from both the intraperitoneal contents and the subcutaneous space, exploiting the retro-rectus space medially and the avascular plane between the internal and external oblique muscles laterally. We report our short and long-term results of 26 consecutive liver transplant cases with incisional hernias undergoing repair with the peritoneal flap technique.

Methods

Post-OLT patients undergoing elective peritoneal flap hernioplasty for incisional hernias from Jan 1, 2010–Nov 1, 2017 were identified from the Lothian Surgical Audit system (LSA), a prospectively-maintained computer database of all surgical procedures in the Edinburgh region of south-east Scotland. Patient demographics and clinical data were obtained from the hospital case-notes. Follow-up data were obtained in Feb 2020.

Results

A total of 517 liver transplantations were performed during the inclusion period. Twenty-six of these (18 males, 69%) developed an incisional hernia and underwent a peritoneal flap repair. Median mesh size (Optilene Elastic, 48 g/m², BBraun) was 900 cm² (range 225–1500 cm²). The median time to repair following OLT was 33 months (range 12–70 months). Median follow-up was 54 months (range 24–115 months) and median postoperative stay was 5 days (range 3–11 days). Altogether, three patients (12%) presented with postoperative complications: 1 with hematoma (4%) and two with chronic pain (8%). No episodes of infection or symptomatic seroma were recorded. No recurrence was recorded within the follow-up period.

Conclusion

Repair of incisional hernias in patients following liver transplantation with the Peritoneal Flap Hernioplasty is a safe procedure associated with few complications and a very low recurrence rate. We propose this technique for the reconstruction of incisional hernias following liver transplantation.

Length of stay and surgical site complications are not increased after elective incisional hernia in patients with a history of solid organ transplantation

BACKGROUND

The incidence of ventral hernia development after solid organ transplantation has been reported to be up to 30%. We aim to determine the impact of previous solid organ transplant on post-operative length of stay (LOS) and surgical site complications in elective ventral hernia repairs.

METHODS

A retrospective review of prospectively collected data from the Abdominal Core Health Quality Collaborative (ACHQC) was conducted to include all patients age 18 years or older who underwent elective incisional hernia repair. Those with and without a history of solid organ transplantation were compared. The primary outcome was in-hospital LOS. Secondary outcomes included 30-day surgical site infection (SSI) rate, 30-day surgical site occurrence requiring procedural intervention (SSOPI) rate, 30-day overall post-operative complications and recurrence. The association between transplant and the LOS was tested with a negative binomial regression model adjusted for the demographic characteristics, comorbidities and hernia characteristics in the model.

RESULTS

The population analyzed included 13,452 (98.79%) patients without a history of organ transplantation and 165 (1.21%) patients who had a history of organ transplantation. After adjusting for age, hernia width, BMI, gender, race, insurance type, ASA class, hypertension, dyspnea, OR time > 2 h, abdominal wall SSI history, recurrent hernia, operative approach the median LOS was not significantly different between patients with a history of solid organ transplant [2.8 (2.6, 2.9) days] and those without [2.6 days (2.2, 3.1)] (p = 0.5). The proportion of SSI (2.4% vs 4.04%; p = 0.42), SSOPI (4.2% vs 5.8%; p = 0.38) and recurrence (0.6% vs 0.4%, p = 0.51) was similar between both groups. Other remaining 30-day post-operative were negligible in our sample.

CONCLUSIONS

There were no significant differences in LOS or infection rates between patients with and without a history of solid organ transplantation despite known risks of immunosuppression and chronic steroid use. Therefore, although these patients have many classic risk factors for poor outcomes, the data suggest that their history of solid organ transplantation should not preclude them from surgery.

Incisional hernia formation in hepatobiliary surgery using transverse and hybrid incisions: a systematic review and meta-analysis

INTRODUCTION

Evidence suggests that midline incisions should be closed with the small-bite technique to reduce IH formation. No recommendations exist for the closure of transverse incisions used in hepatobiliary surgery. This work systematically summarises rates of IH formation and associated technical factors for these transverse incisions.

METHODS

A systematic search was undertaken. Studies describing the incidence of IH were included. Incisions were classified as transverse (two incision types) or hybrid (transverse with midline extension, comprising five incision types). The primary outcome measure was the pooled proportion of IH. Subgroup analysis based on minimum follow-up of two years and a priori definition of IH with clinical and radiological diagnosis was undertaken.

FINDINGS

Thirteen studies were identified and included 5,427 patients; 1,427 patients (26.3%) underwent surgery for benign conditions, 3,465 (63.8%) for malignancy and 535 (9.9%) for conditions that were not stated or classified as 'other'. The pooled incidence of IH was 6.0% (2.0-10.0%) at a weighted mean follow-up of 17.5 months in the transverse group, compared with 15.0% (11.0-19.0%) at a weighted mean follow-up of 42.0 months in the hybrid group (p = 0.045). Subgroup analysis did not demonstrate a statistical difference in IH formation between the hybrid versus transverse groups.

CONCLUSION

Owing to the limitations in study design and heterogeneity, there is limited evidence to guide incision choice and methods of closure in hepatopancreatobiliary surgery. There is an urgent need for a high-quality prospective cohort study to understand the techniques used and their outcomes, to inform future research.

Incisional Hernias Post Liver Transplantation: Current Evidence of Epidemiology, Risk Factors and Laparoscopic Versus Open Repair. A Review of the Literature

BACKGROUND/AIM

The occurrence of an incisional hernia after liver transplantation consists of a potential complication that may seriously affect the postoperative course and the quality of patient's life in general. The purpose of this study was to report the current epidemiological data, analyze the risk factors, evaluate the role of laparoscopic repair in this condition, and present the technical difficulties in the management of this special patient group.

MATERIALS AND METHODS

A literature search was performed through PubMed. Our criteria included all studies published from March 1982 to February 2019 in English, regarding incisional post-transplant hernias and open or laparoscopic repair. Finally, we collected 19 relevant studies.

RESULTS

Incisional hernia may occur independently of the type of abdominal incision. Risk factors are both patient- and technique-related.

CONCLUSION

Well-organized randomized controlled studies are needed, in order to estimate the best treatment strategy for these patients.