Gastrointestinal Flashcards
(135 cards)
What is the acute abdomen?
A sudden, severe onset of acute abdominal pain lasting less than 24 hours
What signs may indicate peritonitis?
Guarding or rigidity
Rebound tenderness
Absent bowel sounds
What is a complication of peritonitis?
Spontaneous bacterial peritonitis - spontaneous infection of the ascites in cirrhotic liver disease
What is the difference between localised and generalised peritonitis?
Localised - due to underlying organ inflammation such as appendicitis
Generalised - due to perforation such as peptic ulcer or ruptured appendix
What is the foregut border and supply?
Mouth to the major duodenal papilla
Coeliac axis - T12
What is the midgut border and supply?
Major duodenal papailla to 2/3 along the transverse colon
Superior mesenteric artery - L1
What is the hindgut border and supply?
Left 1/3 along the transverse colon to the upper anal canal
Inferior mesenteric - L3
What is a hernia?
Protrusion of a viscus or part of a viscus through a defect in the abdominal wall
What is the process of a hernia becoming strangulated?
Bowel through narrow neck may cause swelling and so an interrupted blood supply.
Capillary pressure increases - leaks into hernial cavity - increases the pressure - increased swelling and pressure - venous outflow reduced - stasis of blood - thrombosis - greater pressure - swelling - necrosis and death of bowel
What is a Richter’s hernia?
Strangulation of the bowel without obstruction.
One wall of the bowel is protruding through the weakness in the abdominal wall. Bowel contents can still pass through but the bowel can still become ischaemic and die
What are the borders of the inguinal cavity?
Roof - M - Transversus abdominis muscles and internal oblique muscle
Anterior - A - External and internal oblique aponeurosis
Lower - L - lacunar ligament and inguinal ligament
Posterior - T - Conjoint tendon and transveralis fascia
What are the types of oesophageal cancers and their associations?
Squamous - Can affect anywhere in the oesophagus, but more common in upper and middle 1/3 - associated with smoking and drinking, HPV, achalasia
Adenocarcinoma - Affects lower 1/3. GORD and obesity
What antibiotics might you give early in acute peritonitis?
IV metronidazole 500mg + Cefuroxime 750mg
What are the causes of upper GI perforations?
INVITED Infections - H.pylori Neoplasm - Gastric carcinoma Vascular - inflammatory or AI Iatrogenic - ERCP or OGD Traumatic - stab wound Endocrine - Zollinger Ellison syndrome Drugs - NSAIDs Chemicals - batteries
What organisms are commonly involved in intra-abdominal abscesses?
Anaerobes, E.coli, klebsiella, enterococcus
What is the definitive management for an intra-abdominal abscess?
IV antibiotics if septic - Amox + met + gent
Radiologically guided US or CT drainage
Open surgical drainage if ^ not possible or safe
What are the first line antibiotics in spontaneous bacterial peritonitis?
IV Tazobactam with piperacillin 4.5g/8h
What triad may be seen in cholangitis? (Inflammation of the biliary tree)
Charcot’s triad - Jaundice, RUQ pain, fever
What pentad may indicate Acute suppurative Cholangitis?
Reynold’s - Jaundice, Fever, RUQ pain, hypotension, confusion
What is Mirizzis syndrome?
Obstructive jaundice
Caused by extrinsic compression of an extra hepatic biliary duct from one or more calculi in the cystic duct or GB. Can present with biliary duct dilation and can mimic e.g. cholangiocarcinoma
What type of pancreatic cancer is most common?
Adenocarcinoma of the head of the pancreas
What tumour marker indicates pancreatic cancer?
CA19-9
What might cause raised amylase?
Acute pancreatitis Ectopic pregnancy Bowel perforation Mesenteric ischaemia DKA
What scale can be used to assess acute pancreatitis?
PANCREAS Glasgow scale/Imrie scale PaO2 < 60 Age > 55 Neutrophils (WCC >15) Calcium < 2 uRea > 16 Enzymes (LDH > 600 or ALT/AST >200) Albumin < 32 Sugar > 10