Experimental studies of the effect of electrosurgical and standard techniques on pancreatic restoration

OBJECTIVE

The aim: There have been investigated the specific features of pancreatic resection with the use of electrosurgical methods on experimental models of clinical operations. Pancreatic tissue regeneration at the surgical site have been studied when employing monopolar, bipolar, electric welding methods as compared with standard surgical technique.

PATIENTS AND METHODS

Materials and methods: The study was performed on 40 white laboratory rats. Pancreatic resection was conducted by standard surgical technique or by welding with electrocoagulation device "Patonmed EWD-300", high-energy electrosurgical device in bipolar mode and in monopolar mode. The pancreatic tissue was examined immediately after the surgery and at 3, 7 and 21 days postoperatively.

RESULTS

Results: In early terms following standard surgery there was seen more severe inflammation and the volume of newly formed connective tissue got increased faster than after the electrosurgical technique. Pancreatic ducts developed in newly formed tissue after the use of each type of electroresection, whereas that event was not observed following standard surgery. When using electrosurgery in monopolar mode, the area of coagulative necrosis was found to be less dense than after resection performed in bipolar mode.

CONCLUSION

Conclusions: Based on the findings, we can conclude that each of the above types of electroresection reduces surgery time, lowers bleeding risks, contributes to formation of the more adequate sealing on the resection surface with no complications of the recovery process.

[COMPARATIVE CHARACTERISTIC OF VARIOUS METHODS OF SIMULATION OF BILIARY PERITONITIS IN EXPERIMENT]

In experiment on rabbits a comparative analysis of various methods of a biliary peritonitis simulation was conducted. In 6 animals a biliary peritonitis was simulated, using perforation of a gallbladder, local serous-fibrinous peritonitis have occurred in 50% of them. In 7 animals biliary peritonitis was simulated, applying intraabdominal injection of medical sterile bile in a 5-40 ml volume. Diffuse peritonitis with exudates and stratification of fibrin was absent. Most effective method have appeared that, when intraabdominal injection of bile was done together with E. coli culture in the rate of 0.33 microbal bodies McF (1.0 x 10(8) CFU/ml) on 1 kg of the animal body mass. Diffuse biliary peritonitis have occurred in all 23 animals, including serous-fibrinous one--in 17 (76%), and purulent-fibrinous--in 6 (24%).

[FORMATION OF BILIODIGESTIVE AND INTERINTESTINAL ANASTOMOSES IN ENVIRONMENT OF BILIARY PERITONITIS, USING A HIGH FREQUENCY ELECTRIC WELDING IN EXPERIMENT]

In experiment on 20 rabbits a diffuse biliary peritonitis was simulated, using intraabdominal injection of a laboratory culture of E. coli suspension and a medicinal bile. In 24 h on background of peritonitis on excluded loop of a small bowel in accordance to method of Roux, using a high frequency electric welding with the help of apparatus Patonmed EKB3-300 a one-layered everting cholecystoenteroanastomosis and enteroenteroanastomosis was formated. In a 6 mo postoperatively a connection line was not revealed from outside or from inside, the signs of stenosis were absent. In environment of a diffuse biliary peritonitis a welding technologies have permitted to form a hermetic and competent biliodigestive and interintestinal anastomoses, the processes of a welding suture regeneration postoperatively have a typical course. Using a high frequency-electric welding it is possible to perform a one-staged reconstructive interventions in environment of a pronounced inflammation of tissues due to subsequent precise conjunction of mucosal sheets of connected organs, preventing the anastomotic stricture formation.

[POSSIBILITIES OF THE AUTOLIPOTRANSPLANTS APPLICATION IN REGENERATION OF DEFECTS OF CARTILAGE TISSUES AND ITS PRELAMINATION]

Possibilities of stimulation of the cartilage tissue regenerative properties in damage, using autolipofilling, were studied.The experimental investigations data witnesses efficacy of cartilage restoration while application of the method proposed. The data obtained are forcing for further investigation on possibilities of the cartilage tissue regeneration, using autolipotransplants.

[IMPACT OF A HEIGHTENED INTRAABDOMINAL PRESSURE ON POLYORGAN INSUFFICIENCY OCCURRENCE IN AN ACUTE PANCREATITIS]

In experiment the impact of intraabdominal hypertension (IAH) on an acute pancreatitis (AP) course was studied up. The procedure of an acute experiment, using intraparenchymatose introduction of 40% solution of ethanol, was proposed. The isolated influence of IAH on target organs was investigated, as well as its impact on the simulated severe AP course. Morphological changes in pancreas, small intestine, kidneys, liver in an AP were studied up. While performing the investigation a negative impact of IAH in AP was noted, such as the polyorgan insufficiency occurence.