Liver And Biliary Pathology Flashcards
What are the normal functions of the liver?
Storage - glycogen, vitamins, iron, copper
Synthesis - glucose, protein, lipids and cholesterol, bile, coagulation factors, albumin
Metabolism / detoxification - Bilirubin, Ammonia, drugs, alcohol, carbohydrates and lipids
What is cirrhosis?
Cirrhosis is an irreversible state that occurs in the liver due to chronic inflammation.
- Ongoing inflammation causes fibrosis
- Associated with hepatocyte necrosis
- Resulting architectural changes - nodules
NON-REVERSIBLE
End result is:
-Imparment of liver function and distortion of architecture leads to vascular changes (portal hypertension)
What can cause cirrhosis?
Drugs - alcohol, iatrogenic
Infection - HBV, HCV
Deposition - fat, iron, copper
Autoimmune - autoimmune, hepatitis, PBC, PSC
Other - a1-antitrypsin, glycogen storage, Budd Chiari
What are the three main mechanisms in which alcohol can affect the liver?
Fatty change - reversible (weeks)
Alcoholic hepatitis - initially reversible (years)
Cirrhosis - end stage, irreversible damage (years)
Thought to be partly due to the build up of acetaldehyde.
What can a fatty liver cause?
Hepatomegaly
What are the symptoms of alcoholic hepatitis?
Can be asymptotic.
Rapid onset jaundice, tender hepatomegaly (RUQ pain)
Symptoms of more severe disease e.g. nausea, oedema, ascites, splenomegaly
How does viral hepatitis cause cirrhosis?
Chronic hep B or C
Blood blown virus
Also poses risk for hepatocellular carcinoma.
Hep B - vaccine but no cute
Hep C - cure but no vaccine. (Most asymptomatic during acute infection so spreads easily)
What is non-alcoholic fatty liver disease (NAFLD)?
Similar pathogenesis to alcoholic liver disease but without alcohol.
Accumulation of triglycerides and other lipids in hepatocytes.
It is becoming more prevalent:
- Obesity
- Diabetes
- Metabolic syndrome
To stop it occurring you should reduce his factors and modify your lifestyle.
What is hereditary haemochromatosis?
Abnormal iron metabolism
-Increased absorption of iron from the small intestine —> excess deposition.
Can effect liver and other organs
Elevated serum iron and ferritin levels
Abnormal LFTs
Autosomal recessive (rare)
Treat with venesection
If you have it, there is an increased risk of hepatocellular carcinoma.
What is Wilson’s disease?
Abnormal copper metabolism
Very very rare and autosomal recessive
-Reduced secretion of copper from biliary system -> accumulation in tissue
-Can affect the liver and other organs
-Reduced serum copper and caruloplasmin
Copper deposits on biopsy
Treat - chelating agents (get rid of copper), zinc, liver transplant.
What is primary sclerosis cholangitis?
Fibrosis of intra and extra hepatic bile dicts
Typically affects men
Can be asymptomatic or present with pruritus, jaundice or cholangitis
Association with hepatobiliary malignancy and UC
Deranged LFTs (obstructive picture) and presence of antibodies (ANCA)
What is primary biliary cirrhosis?
Destruction of intrahepatic bile ducts.
Typically affects women
Can be asymptomatic or present with pruritus +/-jaundice and may have other conditions (RA)
Hepatomegaly in advanced disease.
Deranged LFTs (obstructive picture) and presence of antibodies (AMAs)
What is portal hypertension?
Build up of blood in the portal venous system.
- Fibrotic liver is not very expandable
- Compresses veins entering the liver from the portal venous system.
- This causes increased hydrostatic pressure in the portal venous system.
- Cases ascites
How can portal hypertension cause varices?
Blood can shunt from the portal system to the systemic venous circulation.
This leads to distention of the veins at the site of the anastomoses -varices
What are the three important sites of varices?
Oesophagus -These are the most worrying!
- The distal portion of the oesophagus
- Can lead to mucosal varices
- If these rupture, it can cause significant haematemisis (vomitting blood - worrying)
Umbilical
- Ligament teres links the liver to the umbilicus
- Normally no blood flow
- Caput medusa
Anorectal
- Between superior and middle and inferior rectal veins
Haemorrhoids - typically painless.
