Comparative study of four different types of intraperitoneal mesh prostheses in rats.

Purpose: To compare four types of mesh regarding visceral adhesions, inflammatory response and incorporation.

Methods: Sixty Wistar rats were divided into four groups, with different meshes implanted intraperitoneally: polytetrafluoroethylene (ePTFE group); polypropylene with polydioxanone and oxidized cellulose (PCD); polypropylene (PM) and polypropylene with silicone (PMS). The variables analyzed were: area covered by adhesions, incorporation of the mesh and inflammatory reaction (evaluated histologically and by COX2 immunochemistry).

Does mesenchymal stem cell improve the liver regeneration after the 70% hepatectomy?

Purpose:: To evaluate the effects of mesenchymal stem cells on liver regeneration in rats following a 70% hepatectomy.

Methods:: Forty rats were subjected to 70% hepatectomy and then ~106 mesenchymal stem cells (test group), or saline solution (control group), were infused into their livers via the portal vein. Each treatment group was divided into early and late subgroups (euthanized 3 d and 5 d following the operation, respectively).

Incidence of regurgitation after the banded gastric bypass.

Background: Frequent regurgitation is a common complication following Roux-en-Y gastric bypass (RYGBP). This study investigated the risk of becoming a chronic regurgitator, by considering silicone ring size and lower esophageal sphincter (LES) function, and their relationship with weight loss.

Methods: 80 morbidly obese patients were randomly selected to undergo surgery using ring length of 62 mm (40 patients, group A) or 77 mm (40 patients, group B), with 6 months' postoperative follow-up.