Identification of fifty-seven novel loci for abdominal wall hernia development and their biological and clinical implications: results from the UK Biobank.

PURPOSE: Familial aggregation is known for both hernia development and recurrence. To date, only one genome-wide association study (GWAS) limited to inguinal hernia has been reported that identified four risk-associated loci. We aim to investigate polygenic architecture of abdominal wall hernia development and recurrence. METHODS: A GWAS was performed in 367,394 subjects from the UK Biobank to investigate the polygenic architecture of abdominal wall hernia subtypes (inguinal, femoral, umbilical, ventral) and identify specific single nucleotide polymorphisms (SNPs) that are associated with their risk. Expression quantitative trait loci (eQTL) analysis was performed to identify genes whose expression levels are associated with these SNPs. A genetic risk score (GRS) was used to assess the cumulative effect of multiple independent risk-associated SNPs on hernia development and recurrence in independent subjects (n = 82,064). RESULTS: Heritability (h2) was 0.12, 0.06, 0.16, and 0.07 for inguinal, femoral, umbilical, and ventral hernias, respectively. A high-level of genetic correlation (rg) was found among these subtypes of hernia. We confirmed the aforementioned four loci and identified 57 novel loci (P < 5 × 10-8), including 55, 3, 5, and 3 loci for inguinal, femoral, umbilical, and ventral hernias, respectively. Significantly different expression levels between risk/reference alleles of SNPs were found for 145 genes, including TGF-ß2 and AIG1 for inguinal hernia risk and CALD1 for umbilical hernia risk. Finally, higher GRS deciles were significantly associated with increased risk for hernia development (Ptrend = 3.33 × 10-38) and recurrent hernia repair surgery (Ptrend = 3.64 × 10-14). CONCLUSION: These novel results have potential biological and clinical implications for hernia management in high-risk patients.

Comprehensive Analysis of Adverse Events Associated with Gastric Peroral Endoscopic Myotomy: An International Multicenter Study.

BACKGROUND: Gastric peroral endoscopic myotomy (G-POEM) has emerged as an effective management approach for patients with refractory gastroparesis. This study aims to comprehensively study the safety of G-POEM and describe the predictive factors of adverse events (AEs) occurrence. METHODS: This study is a retrospective study involving 13 tertiary care centers (7 USA, 1 South America, 4 Europe, and 1 Asia). Patients who underwent G-POEM for refractory gastroparesis were included. Cases were identified by the occurrence of AEs. For each case, two controls were randomly selected and matched for age (± 10 years), gender, and etiology of gastroparesis. RESULTS: A total of 216 patients underwent G-POEM for gastroparesis. Overall, 31 (14%) AEs were encountered [mild 24 (77%), moderate 5 (16%), and severe 2 (6%)] during the duration of the study. The most common AE was abdominal pain (n = 16), followed by mucosotomy (n = 5) and capnoperitoneum (n = 4), and AEs were most commonly identified within the first 48-h post-procedure 18 (58%). The risk of adverse event occurrence was significantly higher for endoscopists with experience of < 20 G-POEM procedures (OR 3.03 [1.03-8.94], p < 0.05). CONCLUSION: G-POEM seems to be a safe intervention for refractory gastroparesis. AEs are most commonly mild and managed conservatively. Longitudinal mucosal incision, use of hook knife, use of clips for mucosal closure and endoscopist's experience with > 20 G-POEM procedures is significantly associated with decreased incidence of AEs.

Rectus abdominis atrophy after ventral abdominal incisions: midline versus chevron.

PURPOSE: Although many outcomes have been compared between a midline and chevron incision, this is the first study to examine rectus abdominis atrophy after these two types of incisions. METHODS: Patients undergoing open pancreaticobiliary surgery between 2007 and 2011 at our single institution were included in this study. Rectus abdominis muscle thickness was measured on both preoperative and follow-up computed tomography (CT) scans to calculate percent atrophy of the muscle after surgery. RESULTS: At average follow-up of 24.5 and 19.0 months, respectively, rectus abdominis atrophy was 18.9% greater in the chevron (n = 30) than in the midline (n = 180) group (21.8 vs. 2.9%, p < 0.0001). Half the patients with a chevron incision had >20% atrophy at follow-up compared with 10% with a midline incision [odds ratio (OR) 9.0, p < 0.0001]. No significant difference was observed in incisional hernia rates or wound infections between groups. CONCLUSION: In this study, chevron incisions resulted in seven times more atrophy of the rectus abdominis compared with midline incisions. The long-term effects of transecting the rectus abdominis and disrupting its innervation creates challenging abdominal wall pathology. Atrophy of the abdominal wall can not be readily fixed with an operation, and this significant side effect of a transverse incision should be factored into the surgeon's decision-making process when choosing a transverse over a midline incision.

Laparoscopic ischemic conditioning of the stomach prior to esophagectomy.

Several complications after esophagectomy with gastric pull-up are associated with ischemia within the gastric conduit. The aim of this study is to assess the feasibility of laparoscopic ischemic preconditioning of the stomach prior to thoracotomy, esophagectomy, and gastric pull-up with an intrathoracic anastomosis. A retrospective review of 24 consecutive patients between October 2008 and July 2011 with esophageal adenocarcinoma (stage I-III) undergoing laparoscopic gastric ischemic conditioning prior to esophagectomy was conducted. Conditioning included laparoscopic ligation of the left and short gastric arteries, celiac node dissection, and jejunostomy tube placement. Formal resection and reconstruction was then performed 4-10 days later. Of the 24 patients, 88% received neoadjuvant chemotherapy/radiation therapy. Twenty-three of the 24 patients underwent successful laparoscopic ischemic conditioning and subsequent esophagectomy. Total mean number of lymph nodes harvested was 21.8 (±8.0), and a mean of 5.3 (±2.4) celiac lymph nodes identified. There were no conversions to an open procedure. Length of stay was 3.8 (±4.8) days with a median length of stay of 2 (1-24) days. Three patients experienced anastomotic leak, six patients experience delayed gastric emptying, and two patients developed anastomotic stricture. There were no surgical site infections. R0 resection was achieved in all patients who underwent laparoscopic ischemic conditioning followed by esophagectomy. Laparoscopic ischemic conditioning of the gastric conduit has been shown to be feasible and safe.

Biomesh placement in laparoscopic repair of paraesophageal hernias.

The placement of mesh in the crural closure of paraesophageal hiatal hernia repairs has been shown to decrease hernia recurrence rates. Typical synthetic mesh are easy to use but have high rate of erosion into the esophagus. Alternatively, biologic mesh decrease the risk of erosion, but are more difficult to manipulate, and there is currently no well-described method for securing them. Current fixation techniques of mesh are difficult, cumbersome, incur extra expense, and are not without complications. A method that requires no additional sutures or staples and achieves excellent contact and reinforcement of the crural closure is presented.

Outcomes after pancreatectomy for intraductal papillary mucinous neoplasms of the pancreas: an institutional experience.

PURPOSE: To evaluate the experience with pancreatectomy for intraductal papillary mucinous neoplasm (IPMN) at a single academic institution. METHODS: A prospective pancreatic database was reviewed and identified 43 patients with IPMN who were managed operatively. Clinicopathologic features and predictors of outcome were examined. The World Health Organization pathologic classification of IPMN was utilized. RESULTS: IPMN was diagnosed in 21% of patients who underwent pancreatic resection for solid or cystic mass lesions. Ninety-five percent of patients were symptomatic. Patients were managed with total pancreatectomy, pancreaticoduodenectomy, distal pancreatectomy, central pancreatectomy, or enucleation. Nine patients had adenomas, 14 had borderline neoplasms, 10 had carcinoma in situ, and 9 had invasive carcinoma. Overall, 23 patients (53%) had lesions with main duct involvement. Frozen section transection margins were positive for malignancy in 2 patients. With a mean follow-up of 17 months, the 5-year disease-specific survival for patients with main duct involvement was 67%. The 5-year disease-specific survival for patients with benign lesions was 100%, and 61% for patients with malignant lesions (P = .02). The presence of symptoms, increased CA 19-9, and tumor size were not predictive of malignancy. Increased serum bilirubin concentrations were predictive of malignancy (P = .03). Main duct involvement was also associated with malignancy (P < .02). CONCLUSIONS: Cancer is found in 65% of patients with IMPN involving the main duct. Based on our data, patients with symptomatic, main duct involvement, especially those with an increased serum bilirubin, should be offered resection. Alternatively, patients with side branch IPMN may be managed conservatively.