(SYNOPTIC) Liver Disease & Management Flashcards
What percentage of the liver is comprised of hepatocytes?
60%
How many blood supplies does the liver have?
2
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Hepatic artery (from heart) OXYGEN RICH BLOOD
Portal vein (blood from the bowel)
NUTRIENT REACH BLOOD
What are the functions of the liver?
(1) Metabolism
(2) Synthesis
(3) Immunological
(4) Storage
(5) Secretion
(6) Homeostasis
What are some examples of substances metabolised in the liver?
- Products of digestion
- Bilirubin (yellowish substance made during your body’s normal process of breaking down old red blood cells.)
- Steroid hormone
- Insulin
- Aldosterone
- Vitamin D
What is synthesised in the liver?
- bile and bile salts?
Plasma proteins - Clotting factors
- Cholesterol
- Urea (from amino acids)
What is stored in the liver?
- Fat soluble vitamins
- Glycogen
- Blood reservoir
What is secreted in the liver?
Bile + bile salts
What is the function of the liver in homeostasis?
Glucose regulation
Conversion of glucose to glycogen
What are some potential causes for chronic liver disease?
- alcohol
- NAFLD/ NASH
ø Non-alcoholic fatty liver disease - immune/ autoimmune
- drugs
- malignancy
- HCV/ HBV
ø Hep C + Hep V
What are some potential causes for acute liver disease?
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- HAV/ HBV/ HEV
ø 3rd trimester of pregnancy
- Drugs
- TPN: a method of feeding that bypasses the gastrointestinal tract. A special formula given through a vein provides most of the nutrients the body needs
- Infection, e.g. malaria
- Ischaemia: condition in which blood flow (and thus oxygen) is restricted or reduced in a part of the body.
- Alcoholic hepatitis
- Acute fatty liver of pregnancy
( is a rare but serious condition that can occur in pregnant women, especially during the third trimester. It is characterized by the accumulation of fat in the liver, which can lead to liver dysfunction and failure if left untreated)
What increases risk of non-alcoholic fatty liver disease?
- T2DM
- Obesity
- Dyslipidaemia
What may be the first presentation of NAFLD?
Cirrhosis
What is the non-pharmacological management of NAFLD?
- Weight loss
- Healthy diet
- Exercise
- Smoking/ alcohol cessation
- 2-3 cups of black coffee daily
What is the pharmacological management of NAFLD?
- Statins
- Treat HTN/ T2DM
What co-morbidities can make a HepC (HCV) infection worse?
(1) HIV
(2) Underlying cirrhosis
(3) Liver transplant
(4) Lifestyle
What is the process of chronic liver disease development?
(1) Insult
- e.g. toxin/ virus
(2) Hepatitis or steatohepatitis (more severe form of nonalcoholic fatty liver disease)
(3) Reversible
- if cause is stopped, e.g. alcohol cessation
(4) If insult is not removed
(5) Fibrosis
- scarring + thickening of smooth muscle
(6) Cirrhosis
What is the general classification of liver disease?
(1) Compensated
- Asymptomatic due to medication/ sufficient healthy liver tissue for normal function
(2) Decompensated
- Symptomatic
In short, “compensated” indicates that the body is able to maintain its normal functioning despite a health condition, while “decompensated” indicates that the body is struggling to maintain that normal functioning and may require more intensive medical intervention.
What is a liver function test?
Used to identify patients struggling with liver/ biliary tract disease
What is a downside of liver function tests when checking for liver disease?
Some LFTs reflect liver DAMAGE rather than function
What results from a liver function test are considered a cause for concern?
3 times the upper limit of normal
How should a liver function test be used?
(1) Look for trends
(2) Do not use in isolation
What would a liver function test (LFT) show in acute hepatocellular damage?
HIGH - plasma ALT HIGH - plasma AST HIGH - bilirubin (unconjugated) PROLONGED - prothrombin time: a test to evaluate blood clotting NORMAL -
Acute hepatocellular damage refers to injury or damage to the liver cells (hepatocytes) that occurs over a short period of time, usually within a few days or weeks
Elevated levels of liver enzymes: Alanine transaminase (ALT) and aspartate transaminase (AST) are enzymes that are found predominantly in liver cells. In acute hepatocellular damage, the levels of these enzymes in the blood can be significantly elevated, indicating that liver cells are being damaged or destroyed.
Elevated bilirubin levels: Bilirubin is a waste product that is produced when red blood cells break down. It is normally processed by the liver and excreted in the bile. In acute hepatocellular damage, the liver may not be able to process bilirubin properly, leading to an increase in the level of bilirubin in the blood. This can cause jaundice, a yellowing of the skin and eyes.
Abnormal clotting function: The liver produces several proteins that are involved in blood clotting. In acute hepatocellular damage, the liver may not be able to produce these proteins properly, leading to abnormal clotting function and an increased risk of bleeding.
Decreased albumin levels: Albumin is a protein that is produced by the liver and helps to maintain the osmotic pressure of blood. In acute hepatocellular damage, the liver may not be able to produce enough albumin, leading to a decrease in its level in the blood.
What would a liver function test (LFT) show in chronic hepatocellular damage?
NORMAL - ALT
NORMAL - AST
LOW - albumin
PROLONGED - prothrombin time
What would a liver function test (LFT) show in cholestasis (blockage of bile duct)?
HIGH - plasma ALP
Cholestasis is a condition in which the flow of bile from the liver to the small intestine is disrupted, leading to the accumulation of bile in the liver and an increase in the levels of bilirubin and alkaline phosphatase (ALP) in the blood.
Bile contains many substances, including bile salts, cholesterol, and bilirubin, and is released into the small intestine to aid in the digestion and absorption of fats.
HIGH - bilirubin (conjugated)
What other investigations can be done alongside a liver function test (LFT)?
(1) Ethanol
(2) Drug history
(3) FBC
(4) Clotting
(5) U+Es (urea and electrolytes?)
(6) Liver ultrasound
(7) Biopsy
(8) Liver screen
- if obstruction ruled out
- check for viral causes
How is acute liver failure graded?
(1) Hyperacute
- 6-7 days
(2) Acute
- 8-28 days
(3) Subacute
- 29-84 days
In which liver failure grade(s) is cerebral oedema rare?
Subacute
swelling of the brain
In which liver failure grade(s) is cerebral oedema common?
Hyperacute/ acute/ subacute
(1) Hyperacute
(2) Acute
What is the prognosis for each liver failure grade?
Hyperacute - moderate
Acute - Poor
Subacute - Poor
prognosis: chance of recovery
What is used to grade chronic liver disease?
(1) Child’s Pugh Score
(2) MELD
- Model for end-stage liver disease
- OR UKELD
What are the grades for chronic liver disease using the Child’s Pugh Score?
(1) A 5-6 points COMPENSATED
(2) B 7-9 MODERATE
(3) C 10-15 ADVANCED
What is the MELD score used for?
Determining the mortality of end-stage liver disease
MELD score is a scoring system used to assess the severity of liver disease and the risk of mortality in patients with chronic liver disease, as well as those with acute liver injury or failure
What are some common symptoms of liver disease?
(1) Jaundice - yellowing of eye
(2) Spider nevi in upper chest (small, reddish or bluish spider-like blood vessels that appear on the skin)
(3) Ascites - accumulation of fluid in peritoneal cavity
(4) Clubbing of nails
(5) Dilated abdominal veins
(6) Ankle oedema
(7) Bleeding tendency due to decreased prothrombin time
Normally, the liver produces a protein called albumin that helps to maintain the balance of fluids in the body. When the liver is damaged or diseased, it may not produce enough albumin, leading to fluid accumulation in the legs and ankles.
Liver disease can cause changes to blood vessels of skin. s. One of the primary mechanisms is the buildup of toxins in the blood that are normally cleared by the liver.
Which blood vessel brings blood to the liver from the heart?
Hepatic artery
Which blood vessel brings blood to the liver from the bowel?
Portal vein
How many general functions of the liver are there?
6
What are the general functions of the liver?
(1) Homeostasis
(2) Storage
(3) Metabolism
(4) Immunological
(5) Secretion
(6) Synthesis
Name some causes of chronic liver disease.
- Alcohol
- NASH/ NAFLD
- Drugs
- Malignancy
- Autoimmune
- HCV/ HBV
- Metabolic, e.g. haemochromatosis
Name some causes of acute liver disease.
- Drugs
- TPN
- Ischaemia
- Infection
- Alcoholic hepatitis
- Acute fatty liver of pregnancy
What is non-alcoholic fatty liver disease?
A range of liver diseases
From simple fatty liver -> Non-alcoholic seato-hepatitis -> Fibrosis/ cirrhosis
What are some risk factors for NAFLD?
- Diabetes
- Obesity
- Dyslipidaemia (metabolic syndrome)
What is the non-pharmacological management for NAFLD?
- Weightloss
- Healthy diet
- Exercise
- Stop smoking/ alcohol
- 2-3 cups of black coffee daily
What is the pharmacological management for NAFLD?
- Treat BP
- Treat diabetes
- Statins
What patient groups are at higher risk of Hepatitis B?
- IV drug users
- Casual sex
- Close family members
- Babies born to infected mothers
- HCPs
What are the stages of progression of chronic liver disease?
(1) Insult
- e.g. toxin/ virus
(2) Hepatitis/ steatohepatitis
(3) Reversible
- liver is regenerating
(4) Insult not removed
(5) Fibrosis
- thickening + scarring
(6) Cirrhosis
- chronic liver disease
What is compensated chronic liver disease?
Asymptomatic
Sufficient meds/ tissue to continue normal function
What is decompensated chronic liver disease?
Symptomatic