Management of biliary stones in bariatric surgery.

Unlabelled: Morbidly obese and post-bariatric surgery patients are at increased risk for biliary stones formation. The complications related to biliary stones may impose complexity on their management. This study aimed to review the management of biliary conditions in obese and bariatric patients.

Critical analysis of experimental model for study of adhesions after incisional hernias induced in rats' and repair of abdominal wall with different biomaterials.

Background: Adhesions induced by biomaterials experimentally implanted in the abdominal cavity are basically studied by primary repair of different abdominal wall defects or by the correction of incisional hernias previously performed with no precise definition of the most appropriate model.

Aim: To describe the adhesions which occur after the development of incisional hernias, before the prosthesis implantation, in an experimental model to study the changes induced by different meshes.

Methods: Incisional hernias were performed in 10 rats with hernia orifices of standardized dimensions, obtained by the median incision of the abdominal wall and eversion of the defect edges.

Constriction rate variation produced by partial ligation of the portal vein at pre-hepatic portal hypertension induced in rats.

Background: Partial portal vein ligation causes an increase in portal pressure that remains stable even after the appearance of collateral circulation, with functional adaptation to prolonged decrease in portal blood flow.

Aim: To assess whether different constriction rates produced by partial ligation of the vein interfere with the results of this experimental model in rats.

Methods: Three groups of five rats each were used; in group 1 (sham-operated), dissection and measurement of portal vein diameters were performed.

Unfeasible experimental model of normothermic hepatic ischemia and reperfusion in rats using the Pringle maneuver.

Background: The negative result of a research does not always indicate failure, and when the data do not permit a proper conclusion, or are contrary to the initial project, should not simply be discarded and archived.

Aim: To report failure after performing experimental model of liver ischemia and reperfusion normothermic, continuous or intermittent, in small animals aiming at the study of biochemical and histological parameters after postoperative recovery.

Methods: Fifteen Wistar rats were divided into three groups of five animals each; all underwent surgery, the abdomen was sutured after the proposed procedures for each group and the animals were observed for 6 h or until they died, and then were reoperated.

Volume calculation of rats' organs and its application in the validation of the volume relation between the abdominal cavity and the hernial sac in incisional hernias with "loss of abdominal domain".

Background: The calculation of the volume ratio between the hernia sac and the abdominal cavity of incisional hernias is based on tomographic sections as well as the mathematical formula of the volume of the ellipsoid, which allows determining whether this is a giant hernia or there is a "loss of domain". As the images used are not exact geometric figures, the study of the volume of two solid organs of Wistar rats was performed to validate these calculations.

Aim: To correlate two methods for determining the volume of the kidney and spleen of rats, comparing a direct method of observation of the volume with the mathematical calculation of this value.

Increase in spleen volume of rats on experimental model of pre-hepatic portal hypertension.

Background: Pressure increase in the portal venous system, caused by reduction of blood supply to the liver, develops collateral circulation of splanchnic vessel that reaches the venous system of superior vena cava. The spleen works as an auxiliary capacitance system which compensates the increase in portal pressure that may cause splenomegaly.

Aim: To reproduce experimental model of pre-hepatic portal hypertension by reducing the caliber of the vein, allowing the study of alterations in the rat's spleen in this situation.