3. Definition
Yellowish discoloration of the skin, sclerae and mucous membrane due to
hyperbilirubinaemia.
Normal bilirubin level 0.3-1.3mg/dL.
Manifested when serum bilirubin level >3mg/dL.
Besides a rise in the bilirubin level, yellowness of the skin can be due to
carotenemia (excess in diet) or, use of drug quinacrine.
It’s not a disease, rather it’s a clinical SIGN of many diseases.
4. Neonatal Jaundice
In NNJ serum bilirubin levels are >85 μmol/L (5 mg/dl).
This occurs in approximately 60% of term infants and 80% of preterm infants.
First becomes visible in the face and forehead. Blanching reveals the
underlying colour. Jaundice then gradually becomes visible on the trunk and
extremities.
5. Pathophysiology
Bilirubin Metabolism
Bilirubin is a yellowish pigment found in bile.
It is result from the breakdown of mature RBCs in reticuloendothelial system.
15% of bilirubin comes from the catabolism of other haem-containing
proteins, such as myoglobin.
250 – 300 mg of bilirubin are produced daily.
Released to plasma bound to albumin.
Hepatocytes conjugate it and excrete through bile channels into small
intestine.
14. Prehepatic / Hemolytic Jaundice
The increased breakdown of RBCs leads to an increase in production of bilirubin.
Level of unconjugated bilirubin is raised.
The serum transferase and ALP are normal.
Causes:
Hemolytic disorders: spherocytosis, sickle cell anemia, G6PD deficiency
Inherited: Crigler Najjar syndrome (deficient of UDPGT), Gilbert syndrome (defective
uptake)
Drugs: rifampicin, probenecid, ribavirin
Infection: malaria
Transfusion reaction
Hemoglobinopathy
15. Hepatic Jaundice
Inability of liver to transport bilirubin across hepatocytes into bile due to liver
disease.
Increase level of unconjugated and conjugated bilirubin.
Usually associated with increased level of transaminase.
17. Posthepatic Jaundice
Condition which there is blockage of the flow of bile out of liver.
Commonly gallstones, PBC, bile ducts stricture
Charecteristically a/w tea-colored urine, pale-colored stool and pruritis.
Intrahepatic
Extrahepati
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19. Extrahepatic:
Benign: Choledocholithiasis (bile duct stones), choledochal cyst, pancreatitis
Malignancy: Carcinoma of head of pancreas, cholangiocarcinoma, gallbladder CA
20. Presentation
Associated symptoms:
Abdominal pain
Fever
Fat intolerance
Change in urine and stool colour
Pruritis
LOA and LOW
Bleeding tendency
Abdominal distension
Pedal edema
21. Medication history
Family history – hemolytic anemia, hepatitis, congenital hyperbilirubinaemia
Social history
Occupational history – contact with rats/rodents
Travel history
Tattoos, sexual activity
Alcohol history
Parenteral exposures: IV drug abuse, blood transfusion
25. Investigations
Blood:
Full blood count (FBC) –anemia/thrombocytopenia/leucopenia/leucocytosis
Liver function test (LFT)
Albumin
Total bilirubin, direct and indirect
Transaminase
ALT found mainly in liver, while AST also found in other muscles like skeletal and cardiac
ALT is more specific in detecting liver disease
Alkaline phosphatase – increased in obstructive jaundice/cholestasis
(response of the liver to any form of biliary tree obstruction)
Hepatitis screening
Leptospira serology, creatinine kinase
Coagulation profile
Quinacrine: antiprotozoal, antirheumatic and an intrapleural sclerosing agent
Phenols: a class of chemical compounds consisting of a hydroxyl group (—OH) bonded directly to an aromatic hydrocarbon group
UDP glucuronosyltransferase
Probenecid: is a medication that increases uric acid excretion in the urine. It is primarily used in treating gout and hyperuricemia.
Ribavirin: is an anti-viral medication used to treat RSV infection, hepatitis C, and viral hemorrhagic fever.
PBC begins with loss of immune self tolerance, leading to damage of the biliary epithelial cells of small bile ducts. Ongoing immunologic events perpetuate the biliary epithelial cell destruction via direct cytotoxicity or lymphokine-mediated cell damage, leading to disease progression.
Primary sclerosing cholangitis (PSC) is a chronic liver disease characterized by a progressive course of cholestasis with inflammation and fibrosis of the intrahepatic and extrahepatic bile ducts.