Mesh-augmented versus direct abdominal closure in patients undergoing open abdomen treatment

BACKGROUND: Open abdomen (OA) may be required in patients with abdominal trauma, sepsis or compartment syndrome. Vacuum-assisted wound closure and mesh-mediated fascial traction (VAWCM) is a widely used approach for temporary abdominal closure to close the abdominal wall. However, this method is associated with a high incidence of re-operations in short term and late sequelae such as incisional hernia. The current study aims to compare the results of surgical strategies of OA with versus without permanent mesh augmentation. METHODS: Patients with OA treatment undergoing vacuum-assisted wound closure and an intraperitoneal onlay mesh (VAC-IPOM) implantation were compared to VAWCM with direct fascial closure which represents the current standard of care. Outcomes of patients from two tertiary referral centers that performed the different strategies for abdominal closure after OA treatment were compared in univariate and multivariate regression analysis. RESULTS: A total of 139 patients were included in the study. Of these, 50 (36.0%) patients underwent VAC-IPOM and 89 (64.0%) patients VAWCM. VAC-IPOM was associated with reduced re-operations (adjusted incidence risk ratio 0.48 per 10-person days; CI 95% = 0.39-0.58, p < 0.001), reduced duration of stay on intensive care unit (ICU) adjusted hazard ratio (aHR) 0.53; CI 95% = 0.36-0.79, p = 0.002 and reduced hospital stay (aHR 0.61; CI 95% = 0.040-0.94; p = 0.024). In-hospital mortality 22.5 vs 18.0%, risk difference - 4.5; confidence interval (CI) 95% = - 18.2 to 9.3; p = 0.665 and the incidence of intestinal fistula (18.0 vs 22.0%, risk difference 4.0; CI 95% = -10.0 to 18.0; p = 0.656) did not differ between the two groups. In Kaplan-Meier analysis, hernia-free survival was significantly increased after VAC-IPOM (p = 0.041). CONCLUSIONS: In patients undergoing OA treatment, intraperitoneal mesh augmentation is associated with a significantly decreased number of re-operations, duration of hospital and ICU stay and incidence of incisional hernias when compared to VAWCM.