Liver, Biliary and Pancreatic Disease Flashcards
High levels of what, causes Jaundice?
Serum Bilirubin
- Conjugated hyperbilirubinaemia = more common in clinical practice than unconjugated (i.e. obstrutive Jaundice is most common form of Jaundice)
- Conjugated hyperbilirubinaemia is rarely measured in lab as signs/symptoms are used to differentiate: conjugated vs unconjugated hyperbilirubinaemia
- Conjugated hyperbilirubinaemia –> dark urine + pale stools + pruritis (itching)
Jaundice caused by Conjugated Hyperbilirubinaemia can be subdivided into what catagories?
- Obstructive Jaundice - blockage of bile flow in either bile ducts or intrahepatic or extrahepatic ducts
- Hepatocellular Jaundice - caused by Hepatocyte damage – e.g. hepatitis, cirrhosis
What are some causes of Obstructive Jaundice?
Common:
-
CBD stones - causing Biliary Colic, Cholecystitis or ascending Colangitis
- Note: gallstones in the gallbladder don’t cause obstructive jaundice unless they occlude the cystic duct (rare) because they don’t occlude the CBD
- Carcinoma of head of pancreas
Uncommon:
- Cholangiocarcinoma
- Chronic pancreatitis
- Bile duct stricture
- Sclerosing Cholangitis (autoimmune)
- Lymphnoid metastasis
What is the normal pathway from RBC breakdown to excretion of bilirubin derived substances?
- RBC is catabolised by macrophage –> haemoglobin is broken down to release the iron containing Heme
- The Fe2+ is seperated from Heme
- Heme converted to –> Biliverdin
- Biliverdin converted to –> Unconjugated Bilirubin
- Unconjugated Bilirubin trasported to liver by Albumin
- Liver forms Conjugated Bilirubin –> excretes via bile duct into duodenum
- Intestinal bacteria converts conjugated Bilirubin –> Urobiliogen
- 85-90% of Urobiliogen is converted –> Stercobiliogen –> Stercobilin (excreted in faeces, brown colour)
- ~10% Urobiliogen is reabsorbed into portal vein –> some of which is excreted via the Kidneys and converted to –> Urobilin
What are the 3 main types of Jaundice?
-
Pre-Hepatic
- Caused by excessive RBC breakdown –> ↑ unconjugated bilirubin
- Causes:
- Haemolytic anaemia
- Gilbert’s syndrome (autosomal recessive mutation, reduced activity of liver enzyme that makes bilirubin water soluable)
-
Intra-Hepatic
- Dysfunction of the liver, can involve: loss of ability to conjugate, cirrhosis, compression of intra-hepatic sections of biliary tree (obstruction)
- Causes ↑ unconjugated bilirubin and in some cases ↑ conjugated bilirubin in blood –> ‘mixed’ picture
- Causes:
- Alcoholic liver disease –> Cirrhosis
- Hepatitis (viral or autoimmune)
- NASH (non-alcoholic steatohepatitis) –> Cirrhosis
- Hereditary haemochromatosis
- Primary biliary cirrhosis/cholangitis (autoimmune)
- Primary sclerosing cholangitis (autoimmune) - intahepatic as it affects the bile ducts inside the liver as well
- Hepatocellular carcinoma
- Medication
-
Post-Hepatic
- Obstruction of biliary drainage
- ↑ conjugated bilirubin
- Causes:
- Gallstones
- Cancer of head of pancreas
- Changiocarcinoma
- Biliary strictures
How can urine colour be used to differentiate;
conjugated or mixed hyperbilirubinaemia from unconjugated hyperbilirubinaemia?
Urine = Dark‘coca-cola’ in conjugated or mixed hyperbilirubinaemia (post and intra hepatic)
Urine = normal in unconjugated hyperbilirubinaemia (pre-hepatic)
What blood tests and their justifications might you do in a Jaundice patient? (obviously you tailor them to the patient’s history)
-
LFTs (AST, ALT, Alkaline phosphatase)
- Alkaline phosphatase - ↑ in biliary obstruction (or bone injury) - if alkaline phosphate >>> than AST/ALT –> obstruction (>>> = how many folds the increase is)
- If AST, ALT are >>> than alkaline phosphatase –> indicates hepatocellular pathology e.g. viral hepatitis
- AST:ALT ratio is of little benefit in identifying cause of liver injury with the exception of acute alcoholic hepatitis
- If AST:ALT ratio > 2:1 –> likely alcoholic liver disease (acute alcoholic hepatitis)
- If AST: ALT ratio ~ 1 –> likely viral hepatitis
- Coagulation Studies - Prothrombin time (PT) / INR can be used as a marker of liver function
-
FBC:
- Anaemia, ↑ MCV and thrombocytopenia (low platelets) can occur in liver disease
- WCC - determine if bacterial infection present
- Albumin - hypoalbuminaemia (indicative of liver dysfunction)
- U+Es - can dictate pharmacological treatment
What are some causes of Hepatocellular Jaundice?
- Alcoholic hepatitis or cirrohsis
- Viral Hepatitis
- Drug induced e.g. Paracetamol OD
- Non-alcoholic fatty liver disease
- Autoimmune liver disease
- Hereditary Haemochromatosis
- Wilson’s Disease
Patient presents with RUQ pain (which comes and goes), Jaundice and Fever - diagnosis?
Ascending Cholangitis (Inflammation of Bile Duct)
Charcot’s Triad:
- RUQ Pain
- Jaundice
- Fever
Reynold’s Pentad:
- Charcot’s Triad
- Hypotension
- Mental status changes
Patient presents with:
Severe epigastric pain (radiating to back) with guarding, nausea, vomiting and a Hx of high alcohol consumption - diagnosis?
Acute Pancreatitis
- The two most common casues are gallstones and alcohol consumption
70 year old male presents with painless obstructive pattern Jaundice, what is the most concerning diagnosis?
Pancreatic or Liver Cancer
What are some important risk factors for Liver, Biliary and Pancreatic diseases?
- Alcohol intake (Alcoholic liver disease, pancreatitis)
- Drug use (including non-perscription drugs e.g. paracetamol / IV drugs - HIV)
- Foreign Travel
- Blood transfusions (Transfusional iron overload or contaminated blood)
- Tattoos (HIV)
- Unprotected sexual activity (viral hepatitis - association between Hep-B and obstructive Jaundice)
- Weight loss (cancers or nausea/vomiting associated ↓ appetite)
What is the most common cancer in the region of Liver, Biliary ducts and Pancreas?
Cancer of the Head of the Pancreas
- Patients >40yrs with painless, obstructive jaundice –> exclude carcinoma of head of pancreas
- Liver cancer is often caused by metastasis from other primaries e.g. Lung
A patient has Liver Cirrhosis (e.g. due to alcohol or hepatitis), what condition are they at an increased risk of?
What blood test is done as a marker of this condition?
Primary Hepatocellular Cancer
Serum Alpha-fetoprotein
What is the official recommended number of units of alcohol per week for men and women?
14 units per week
What does 14 units of alcohol look like for;
- Beer
- Wine
- Spirits
- 6 pints of beer (4%) - so 4/5 pints of anything stronger
- 7 glasses of wine (11/12% 175ml)
- 14 single shots of spirits (40%)
What is Hepatitis?
Liver inflammation (not necessarily infection)
What the cut-off duration for chronic hepatitis?
> 6 months
Describe the stages of progression / routes stemming from an episode of acute hepatitis.
- Recovery - patient recovers
- Chronic Hepatitis –> increasing Fibrosis –> Cirrhosis
-
Fulminant Hepatitis (acute liver failure):
- Death OR
- Liver Transplant
What are the presenting features of Hepatitis?
when is it fulminant hepatitis (acute liver failure)?
Typically:
- Generally unwell
- Jaundice
- RUQ pain
Severe (when these symptoms present it is called fulminant hepatitis):
- Confusion (hepatic encephalopathy due to ammonia build up)
- Coagulopathy (↑ bruising)
How do patients with Chronic Hepatitis present?
Often they present with NO symptoms
Sometimes: fatigue, vauge RUQ pain
- Normally discovered via routine screening of:
- HIV +ve men as they’re at risk
- Chronic alcoholic pts
- Pregnant women
- IV drug users
- LFTs - mildly deranged
What is Fulminant Hepatitis?
Acute Hepatitis with Liver Failure
- Hepatic encephalopathy occuring within 28 days of onset of Jaundice
- Must be ‘Acute’ Hepatitis e.g. you can’t call 1st presentation of decompensated alcoholic liver disease a fulminant hepatitis - as the condition has been long-standing i.e. chronic
What types of problems does Liver Cirrhosis cause?
Loss of Function - hard to manage:
- Jaundice - ↑ unconjugated bilirubin (due to ↓ conjugated bilirubin production i.e. function of the liver)
- Coagulopathy - ↓ production of clotting factors = bruising/bleeds
- ↓ Drug metabolism - drugs to watch out for; benzodiazepines and opiates
- ↓ Hormone metabolism - ↑ oestrogen (palmar erythema, spider naevi, gynecomastia, loss of 2ndary body hair and shrinking of external genitalia)
- ↑ Sepsis - liver has important role in managing immune system
Portal Hypertension - easier to manage:
- Umbilical Varices (Caput Medusae)
- Oesophageal varices –> GI bleed –> Haematemesis
- Rectal varices i.e. Piles (Haemorrhoids)
- Acities - fluid leaks from portal system into peritoneum
- Encephalopathy (accumulation of nitrates)
- Renal failure (mechanism not understood - but changes in portosystemic bloodflow –> ↑ renal vasocontriction)
What are some common causes of Liver Cirrhosis?
- Hazardous alcohol consumption
- Chronic Hepatitis B + C
- Autoimmune liver disease (autoimmune hepatitis, primary biliary cirrhosis)
- Hereditary haemochromatosis
- Wilson’s Disease
- Chronic Obstruction –> Secondary biliary cirrhosis
What are the physical examination signs of Liver Cirrhosis?
- Palmar erythema - ↑ oestrogen
- Leuconychia - ↓ albumin
- Spider Naevi - ↑ oestrogen
- Gynaecomastia - ↑ oestrogen
- Ascites
- Bruising
- Caput medusa - portal hypertension
If AST, ALT increase in many folds greater than alkaline phosphatase increase what kind of pathology is likely?
Hepatocellular damage/pathology
If Alkaline phosphatase increase is many folds greater than AST, ALT increase what kind of pathology is likely?
Obstructive pathology
What are some symptoms of Acute Alcoholic Hepatitis?
- Jaundice
- Tender Hepatomegaly (large tender liver)
- Vomiting
- Drinking cessation
- Alcohol withdrawal (shivering/shaking/tremor, sweating, nausea, visual or auditory hallucinations, tachycardia, confusion, seizures)