GI: Liver Disease Flashcards
How does liver cirrhosis lead to portal hypertension?
Fibrosis affects the structure and blood flow through the liver, increasing the resistance in the vessels leading into the liver.
This increased resistance and pressure in the portal system is called portal hypertension.
What are the 4 most common causes of liver cirrhosis?
1) Alcohol related liver disease
2) Hep B
3) Hep C
4) Non-alcoholic fatty liver disease (NAFLD)
What 2 infections can lead to cirrhosis?
Hep B and C
Give some rarer causes of cirrhosis
1) Autoimmune hepatitis
2) Alpha 1 antitrypsin deficiency
3) Primary biliary cirrhosis
4) Haemochromatosis
5) Wilsons disease
6) Cystic fibrosis
7) Drugs (e.g., amiodarone, methotrexate and sodium valproate)
Give 3 drugs that can cause cirrhosis
1) methotrexate
2) amiodarone
3) sodium valproate
Signs of cirrhosis on examination?
1) Cachexia
2) Jaundice (raised bilirubin)
3) Hepatomegaly
4) Small nodular liver as it becomes more cirrhotic
5) Spider naevi
6) Caput medusae
7) Gynaecomastia & testicular atrophy in males
8) Splenomegaly (due to portal hypertension)
9) Palmar erythema (increased oestrogen)
10) Bruising (abnormal clotting)
11) Excoriations
12) Ascites
13) Leukonychia (white fingernails) associated with hypoalbuminaemia
14) Asterixis (“flapping tremor”) in decompensated liver disease
What is leukonychia associated with?
Hypoalbuminaemia
Abnormal liver function tests without a clear cause require a non-invasive liver screen.
What does this include?
1) US liver (used to diagnose fatty liver)
2) Hep B & C serology
3) Autoantibodies (autoimmune hepatitis, primary biliary cirrhosis and primary sclerosing cholangitis)
4) Immunoglobulins (autoimmune hepatitis and primary biliary cirrhosis)
5) Caeruloplasmin (Wilsons disease)
6) Alpha-1 antitrypsin levels (alpha-1 antitrypsin deficiency)
7) Ferritin and transferrin saturation (hereditary haemochromatosis)
What test is used to assess for Wilson’s disease?
Caeruloplasmin
What is caeruloplasmin?
a serum copper transport protein.
Describe caeruloplasmin levels in liver disease?
Low
Investigations in Wilson’s disease?
If suspicion of Wilson disease is high, order a ceruloplasmin level. It will be less than 20 mg/dL (normal 20 mg/dL to 40 mg/dL). Urinary copper levels will be raised more than 100 mcg/dL.
What autoantibodies are relevant to liver disease
1) Antinuclear antibodies (ANA)
2) Smooth muscle antibodies (SMA)
3) Antimitochondrial antibodies (AMA)
4) Antibodies to liver kidney microsome type-1 (LKM-1)
How does liver disease affect albumin?
Low albumin due to reduced synthetic function of the liver
How does liver disease affect prothrombin time?
Increased prothrombin time due to reduced synthetic function of the liver (reduced production of clotting factors)
How does liver disease affect platelets?
Thrombocytopenia (low platelets) is a common finding and indicates more advanced disease
How does liver disease affect sodium?
Hyponatraemia (low sodium) occurs with fluid retention in severe liver disease
What is a tumour marker for HCC?
alpha-fetoprotein (AFP)
1st line investigation for assessing fibrosis in non-alcoholic fatty liver disease?
The enhanced liver fibrosis (ELF) blood test
Is the ELF test used in other types of liver disease?
No - only non-alcoholic fatty liver disease
What does the ELF test measure?
It measures three markers (HA, PIIINP and TIMP-1) and uses an algorithm to provide a result that indicates whether they have advanced fibrosis of the liver.
What ELF test result indicates advanced fibrosis?
10.51 or above
What ELF test result indicates unlikely advanced fibrosis?
Under 10.51
What is used to diagnose non-alcoholic fatty liver disease (once other causes are excluded)?
US
How do fatty changes in NAFLD appear on US?
appear as increased echogenicity.
What may an US show in NAFLD?
1) nodularity of the surface of the liver
2) a ‘corkscrew’ appearance to the hepatic arteries with increased flow as they compensate for reduced portal flow
3) Enlarged portal vein with reduced flow
4) Ascites
5) Splenomegaly
What is used as a screening tool for HCC?
US + AFP
What is a transient elastography (i.e. FibroScan)?
Purpose?
Can be used to assess the stiffness of the liver using high-frequency sound waves.
It helps determine the degree of fibrosis (scarring) to test for liver cirrhosis.
When would a transient elastography be used?
It is used in patients at risk of cirrhosis:
1) Alcohol-related liver disease
2) Heavy alcohol drinkers (men drinking more than 50 units or women drinking more than 35 units per week)
3) Non-alcoholic fatty liver disease and advanced liver fibrosis (score 10.51 or more on the ELF blood test)
4) Hepatitis C
5) Chronic hepatitis B
What can be used to assess for and treat oesophageal varices when portal hypertension is suspected?
Endoscopy
What test is used to confirm the diagnosis of cirrhosis?
Liver biopsy
What is an MELD (Model for End-Stage Liver Disease) score?
Gives an estimated 3-month mortality as a percentage for patients with compensated cirrhosis.
How often should the MELD score be used?
NICE recommend using the MELD score every 6 months in patients with compensated cirrhosis.
What is involved in the MELD score?
The formula considers the bilirubin, creatinine, INR and sodium and whether they require dialysis,
What is the Child-Pugh score?
Uses 5 factors to assess the severity of cirrhosis and the prognosis.
Each factor is considered and scored 1, 2 or 3.
What is involved in the Child-Pugh score?
ABCDE:
A – Albumin
B – Bilirubin
C – Clotting (INR)
D – Dilation (ascites)
E – Encephalopathy
How are complications monitored for in cirrhosis?
1) MELD score every 6 months
2) Ultrasound and alpha-fetoprotein every 6 months for hepatocellular carcinoma
3) Endoscopy every 3 years for oesophageal varices
When is liver transplantation generally considered?
when there are features of decompensated liver disease.
What are the 4 key features of decompensated liver disease?
AHOY:
1) Ascites
2) Hepatic encephalopathy
3) Oesophageal varices bleeding
4) Yellow (jaundice)
What is 5-year survival after cirrhosis have developed?
Approx 5 years
What are some complications of cirrhosis?
1) Malnutrition and muscle wasting
2) Portal hypertension, oesophageal varices and bleeding varices
3) Ascites and spontaneous bacterial peritonitis
4) Hepatorenal syndrome
5) Hepatic encephalopathy
6) Hepatocellular carcinoma
How can cirrhosis lead to malnutrition?
1) Patients often have a loss of appetite
2) Cirrhosis affects protein metabolism in the liver and reduces the amount of protein the liver produces.
3) Disrupts the ability of the liver to store glucose as glycogen and release it when required
How does cirrhosis lead to muscle wasting?
Overall, less protein is available for maintaining muscle tissue and muscle tissue is broken down for use as fuel.
Nutritional guidance in liver cirrhosis?
- Regular meals
- High protein and calorie intake
- Reduced sodium intake to minimise fluid retention
- Avoiding alcohol
What is the portal vein?
Comes from the superior mesenteric and splenic veins and delivers blood to the liver.
How does cirrhosis cause portal hypertension?
Liver cirrhosis increases the resistance to blood flow in the liver.
As a result, there is increased back pressure on the portal system (portal hypertension).
How does cirrhosis lead to splenomegaly?
Portal hypertension - back pressure of blood results in splenomegaly.
How does cirrhosis lead to a) oesophageal varices, b) caput medusae?
Back pressure in the portal system causes swollen and tortuous vessels at sites where collaterals form between the portal and systemic venous systems.
These collaterals can occur in:
a) Distal oesophagus (oesophageal varices)
b) Anterior abdominal wall (caput medusae)
Complications of varices?
Varices are asymptomatic until they start bleeding. Due to the high blood flow, bleeding from varices can cause patients to exsanguinate (bleed out) very quickly.
1st line prophylaxis of bleeding in stable oesophageal varices?
Non-selective beta blockers (e.g., propranolol)
If beta blockers are contraindicated, what is the next option for prophylaxis of bleeding in stable oesophageal varices?
Variceal band ligation
What is variceal band ligation?
Variceal band ligation involves a rubber band wrapped around the base of the varices, cutting off the blood flow through the vessels.
Management of bleeding oesophageal varices?
Life threatening - ABCDE
1) Immediate senior help
2) Consider blood transfusion (activate the major haemorrhage protocol)
3) Treat any coagulopathy (e.g., with fresh frozen plasma)
4) Vasopressin analogues (e.g., terlipressin or somatostatin) cause vasoconstriction and slow bleeding
5) Prophylactic broad-spectrum antibiotics (shown to reduce mortality)
6) Urgent endoscopy with variceal band ligation
7) Consider intubation and intensive care
What is given in bleeding oesophageal varices to cause vasoconstriction and slow bleeding?
Vasopressin analogues (e.g., terlipressin or somatostatin)
What are 2 other options to control the bleeding in bleeding oesophageal varices?
1) Sengstaken-Blakemore tube
2) Transjugular intrahepatic portosystemic shunt (TIPS)
What is a Sengstaken-Blakemore tube?
an inflatable tube inserted into the oesophagus to tamponade the bleeding varices