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The effects of combined liquid and membrane barriers in prevention of post-operative intra-abdominal adhesions after experimental jejunal anastomosis in dogs.

The study was carried out on 40 apparently clinical healthy dogs classified into 5 groups of 8 dogs each. Adhesion was experimentally induced by transsection and reanastomosis of jejunum. In the control group the site of anastomosis and abdominal cavity was lavaged with 250 ml saline solution. In group two lavage was done with 250 ml of a liquid barrier composed of a combination of high molecular weight solution (1% sodium carboxymethylcellulose) as a carrier, non-steroidal anti-inflammatory drug (Piroxecam), broad spectrum antibiotic (Cephalosporin), anticoagulant (Heparin) and antioxidant (0.5% methylene blue). In group three the anastomosis site was covered with a sodium hyalouronate/carboxymethylcellulose bioresorbable membrane (Seprafilm). In group four a natural biocompatible collagen sheet (VET BIO SIS T) was applied on the anastomosis site. In group five the abdominal cavity was lavaged with 250 ml liquid barrier and the anastomosis site was covered by either Seprafilm membrane or VET BIO SIS T sheet. At the fourteen day after operation, adhesion was assessed by ultrasonography after instillation of 1000 ml of physiological saline solution into the abdominal cavity. The dogs were sacrificed and an autopsy examination was carried out with the attention to the number, density and site of the adhesion formation. The results revealed that all the control dogs and some dogs in the treatment groups had positive ultrasonographic findings. Transabdominal sonogram clearly showed echogenic bands floating in the abdominal cavity and echogenic masses in more serious subjects. Necropsy examination showed that all the control dogs had intra-abdominal adhesions (8 of 8 dogs) and treatment with liquid barrier (4 of 8 dogs), seprafilm membrane barrier (3 of 8 dogs), VET BIO SIS T sheet barrier (4 of 8 dogs) and combination of fluid and membrane barrier groups (4 of 8 dogs) significantly (p < 0.05) reduced the incidence of adhesion formation. The adhesion severity in the four treated groups was significantly (p < 0.05) decreased compared with the control group as shown by both ultrasonography and necropsy examination scores. In conclusion the suggested hypothesis is more or less positive and the combined liquid and membrane barriers might be an effective way to decrease intra-abdominal adhesion formation, and the ultrasonography is a useful tool to diagnose intra-abdominal adhesion, and their applications might be valuable to the clinical settings.