Large Animal Surgery Models Flashcards
Olbe chronic esophageal Fistula
Developed to study cephalic phase control of gastric, pancreatic and other gut function
Allows “sham” feeding –the food is chewed and swallowed, but does not enter the stomach
Name
Description
Purpose
Mann-Bollman Fistula
Intestinal loop isolated and anastomosed end-to-side with intact intestinal tract with other end connected to skin
Orientation of intestinal loop allows peristalsis to occur away from skin to prevent leakage
“Moving Backwards”
Method used to make one or more fistulae at any level of intestinal tract
Used to study secretions of intestine
Name
Description
Purpose
Thiry fistula
Isolated loop of intestine with intact blood and nerve supply
One end is closed and other opens into skin with peristalsis towards skin to facilitate collection
End-to-end anastomosis restores continuity of remaining intestine
Used to obtain pure intestinal secretions
Name
Description
Purpose
Thiry-Vella Fistula
Prepare same way as Thiry except both ends of blind loop are connected to skin
Intact blood and nerve supply
Used to obtain pure intestinal secretions
“Two words –two holes”
Name
Types
Descriptions
Purpose
Eck Fistulas
Artificial communication made between portal vein and vena cava
Created by side-to-side anastomosis of portal vein to vena cava below liver
Straight Eck: tie off the portal vein above last tributary
Shunting of portal blood into inferior vena cava
Reverse Eck: tie off vena cava
Liver bypass
Allows for study of hepatic encephalopathy and investigation of liver’s role in metabolism
Name
Description
Purpose
Witzel’sGastrostomy
Foley catheter from stomach through skin is exteriorized
Catheter partly buried in stomach wall and stomach fastened to anterior abdominal wall
Used to treat gastric dilatation volvulus (GDV) in large dogs
Name
purpose
Pavlov Cannula
Spool-like device plugged with a cork
Allows direct access to stomach
Used to introduce food or fluid or to obtain stomach content samples
Name
placement
effect
Goldblatt’s clamp
applied experimentally to renal artery
Dampens pulse pressure and produces chronic hypertension by activation of renin-angiotensin system
RITARD:
Stands for
Model for
Technique
Removable Intestinal Tie, Adult Rabbit Diarrhea
Surgical model of choice for studying pathogenesis of diarrheas of Campylobacter, E. coli, and Aeromonas origin
Pavlov’s Fundic Pouch
Linear pouch of greater gastric curvature allowed to drain to outside of the abdomen
Base of pouch still connected to stomach but mucosa cut at base and pouch separated from main stomach by infoldingmucosa of both
Base remains in normal contact with rest of stomach allowing preservation of vagal innervation
Study of nervous phase of gastric secretions
Name
Features
Study of
Heidenhain pouch
Linear pouch of greater gastric curvature allowed to drain to outside of the abdomen
Vagal nerves severed while keeping gastro-epiploicartery intact
Preserve vascular supply but not vagal innervation
Can collect large quantities of gastric fluid without food contaminants
Study effect of drugs on gastric secretions
Mann-Williamson
Technique for duodenal drainage
Allows diversion of gastric juices into
intestine
Connect jejunum to pylorus of stomach
and close both ends of duodenum
Diverts gastric juices downstream from alkaline pancreatic and biliary secretions
95% of animals develop chronic peptic ulcers just distal to gastric anastomosis
Standard model for producing chronic peptic ulcer by duodenal drainage
Study effect of ejected acid in producing ulcers
Name
Description
Purpose
Duodenal reversal
Distal duodenum anastomosed to gastric antrum and proximal duodenum to distal jejunum
Antiperistalsis of duodenum acts as physiological obstruction producing dilation of stomach and duodenum
Chronic jejunalulcers occur in 70% of animals w/in 6 mos
Name
description
purpose
Polya Type pylorectomy
Developed to re-establish continuity of intestinal tract following resection of pyloric antrum
Study differences in fundic(acid, pepsin) and pyloric (alkaline mucus, gastrin) secretory function
