Liver 2.37-44 Flashcards
Arthralgia in liver disease?
Haemochromatosis, Hep B, AIH.
Extent of AST/ALT rise and significance?
1.5-3* ULN = ALD/NAFLD; >3* ULN in viral/drug-induced/AIH.
Serology in AIH?
Raised ANA, anti-SMA (smooth muscle antibody) and IgG. May have history of AI disease.
Serology and folate in ALD/NAFLD?
Raised IgA (with low folate in ALD)
Testing for active Hep C?
RNA PCR/Ag.
Anti-HCV?
Could be current or past infection; need PCR to see if viraemic. 25% will clear spontaneously.
AST/ALT in ALD?
>
- Caused by low ALT activity.
Drugs that can cause CLD?
Paracetamol mainly acute; chronic inc. methotrexate, nitrofurantoin, amiodarone so good DHx needed.
Signs of CLD?
Nail clubbing, palmar erythema, spider naevi, gynaecomastia, paucity of pubic/axillary hair, testicular atrophy, small/irregular liver, anaemia, caput medusae
Signs of decomp CLD?
Drowsiness/hyperventilation/asterixis/fs/foetur hepaticus (encehalopathy), jaundice, ascites, leukonychia, peripheral oedema, ecchymoses, respiratory alkalosis.
Anaemia in CLD?
Can be 2ndary to GI bleed (PT prolonged), hypersplenism caused by portal HTN (megaloblastic), alcohol (macrocytosis).
Most common haem. abnormality in CLD?
Thrombocytopenia (haemodilution, splenomegaly, reduced thrombopoiesis).
Bloods suggesting ethanol use?
Very high GGT (not a reliable measure), macrocytosis, hyperuricaemia, hypertriglyceridaemia.
Lipid abnormality in obstructive jaundice?
Marked hypercholesterolaemia!
Most specific marker for hepatocyte damage?
Probably ALT/PT. PT also affected by vit K deficiency, warfarin, malabsorption etc.
Why give ADH/terlopressin in GI bleed (caused by ruptured varices)?
ADH stimulates vWF (terlopressin is ADH analogue); also reduces portal HTN.
Causes of ascites with low SAAG?
Peritoneal carcinomatosis, nephrotic syndrome, pancreatitis, serositis.
Acute vs chronic GI bleed MCV?
Acute is normocytic; may not be apparent until resuscitate. Chronic causes IDA so is microcytic.
Glasgow-Blatchford score?
Predicts likelihood of needing intervention following acute UGI bleed.
How to confirm Gilbert’s?
Suspect with isolated raised bilirubin; subsequent fasting bilirubin should be further elevated still.
Indications of advanced ALD?
Splenomegaly, other signs of portal HTN on USS, low platelets, low albumin, raised bilirubin.
PBC clinical features?
Raised ALP, +ve AMA (anti-mitochondrial antibodies), IgM elevated, F (:M 10:1), middle aged. ITCH, fatigue, poor cognition, (dry eyes/mouth [other AI disease]). May present with jaundice/advanced liver disease. See xanthelasma/xanthomas. Diagnosis: compatible history, cholestatic LFTs, +ve AMA (no biopsy needed). 2 = probable, 3 = definite. Biopsy can be helpful to stage.Granulomatous inflammation and obliteration of intrahepatic ducts. Bilirubin predicts prognosis.
Diseases associated with PBC?
RA, Sjogren’s (80% of cases).
Extrahepatic Cx of PBC?
Osteoporosis/osteopenia.
T1 AIH CFs?
ANA and anti-SMA +ve, IgG elevated. Any age. F:M 3:1. Hepatitic LFTs.
Diseases assoc. with AIH?
Coeliac, vasculitis, AI thyroiditis.
Diagnosing AIH?
Hepatic LFTs, autoantibodies, IgG elevated; usually need biopsy to stage/diagnose.
PSC CFs?
Hx of IBD (80%) (particularly UC). ALP elevated! p-ANCA +ve. M:F 2:1.
PSC presentation?
- Asymptomatic (raised ALP)
- Symptoms (itch much milder than PBC, fatigue, RUQ pain, weight loss, jaundice). Hepatomegaly (portal HTN due to sclerosis)
- Acute cholangitis.
- Malabsorption (due to inadequate bile release; low fat-soluble vitamins). Get steatorrhoea.
- Cirrhosis/Cx
Diagnosing PSC?
Cholestatic picture (+ ANCA). US/CT not helpful; MRCP shows ‘beads on a string’ with intra/extrahepatic dilatation and multiple strictures. 2/3 of cholestatic LFTs (high ALP), MRCP showing signs, +/- biopsy. If MRCP not diagnostic, ERCP can be done; if both normal then do liver biopsy (may show small duct PSC i.e same disease with normal MRCP findings). See ‘onion skin fibrosis’.
What must be screened for in PSC?
Cholangiocarcinoma (probably with USS/symptom surveillance), CRC (IBD).
Diagnosing/imaging in HCC?
Dynamic contrast MRI more sensitive and specific. 4 phase CT shows characteristic hypervascular (rich vasculature) lesion in arterial phase with washout (shunting) in portal venous/delayed phase. If not enough classical features present, do biopsy (but can diagnose from imaging alone).
AFP in HCC?
Elevated in 50-75% cases; in screening, has high specificity at levels over 200.
Assessing fitness for treatment in HCC?
Do performance status and Child-Pugh. If single nodule can resect; if have single nodule and portal HTN then cannot resect (transplant if no associated disease; RFA/PEI if do). If more advanced, do TACE to infarct tumour, or sorafenib, or palliate.
Eligibility for transplant in HCC (Milan criteria)?
Single tumour <5cm, or up to 3 <3, with no extrahepatic involvement or major vessel involvement. Larger tumours are likely to have locally spread so transplant useless.
Preferred treatment in early/optimal HCC?
Resection; impossible if have portal HTN etc. because need all of liver function possible!
Prognosis in HCC if resectable?
5YS = ~50%. If not the n~24 months median. Vast majority of HCC patients have cirrhosis so already have very bad survival.
How is NASH confirmed?
Biopsy
What is ‘advanced’ NAFLD based on?
Bloods, score, clinical picture. May be transplant candidate.
Courvoisier’s law?
In painless jaundice with enlarged (non-tender) gall bladder, cause is unlikely to be gallstones. Pancreatic or cholangiocarcinoma more likely. Gallbladder with stones is usually chronically fibrosed so cannot enlarge; get pain with acute obstruction ie stones not slow-growing cancer.
What is acute/fulminant hepatic failure?
Devastating clinical syndrome associated with rapid liver dysfunction, coagulopathy, encephalopathy (IN ABSENCE OF EXISTING LIVER DISEASE, IN LESS THAN 6 MONTHS)
Key markers for fulminant hepatic failure?
PT prolonged by 4-6 seconds, INR >1.5
Categories of acute liver failure?
Hyperacute = 0-7 days; acute = 8-28; subacute = 1-3 months.
Features of different classifications of ALF?
Cerebral oedema and raised PT more prominent (hyper)acutely; bilirubin least raised hyperacutely; prognosis best hyperacutely.
Causes of ALF?
Paracetamol (39%), idiosyncratic drug reaction, Hep A/B, indeterminate (17%).
NANB hepatitis?
Non Hep A/B.
What is seronegative hepatitis?
Idiopathic cause of acute liver failure; not Hep A-E. Does not include paracetamol OD etc.
Major and minor routes of paracetamol metabolism?
Major (saturable) route is to sulphate/glucoronide conjugates; minor route is to NAPQI, causing cell death (detoxified by glutathione to mercapturic acid conjugates).
What detoxifies NAPQI?
Glutathione
What is the role of NAC in paracetamol (acetaminophen) OD?
Replaces glutathione to allow detoxififcation
Which patients are high risk in paracetamol OD?
Malnourished, enzyme induction (alcohol, AEDs, rifampicin)
Key investigations in ?paracetamol OD?
INR, creatinine, glucose, ABG WITH LACTATE ammonia.
Why do Doppler US in ALF?
Can find ischaemia/thrombosis (inc. Budd-Chiari) to explain ALF.
Value of MRI liver size in ALF?
Good prognostic marker (unlikely to survive if under 750mls)
Why might ALT normalise in ALF?
Massive necrosis (bilirubin and PT likely to still be rising).
Differential of massive transaminitis/ALF?
- Vascular (hypotension, congestion, HAT)
- Viral
- Drugs/toxins (paracetamol, NSAIDs, statins, Abx [nitrofurantoin])
- Others (Wilson’s, AIH).
Three IC Cx of ALF?
HE, cerebral oedema, IC HTN.
Four changes to metabolic function in ALF?
Decreased:
- Gluconeogenesis (hypoglycaemia)
- Lactate clearance (lactic acidosis)
- Ammonia clearance (HE/hyperammonaemia)
- Synthetic capacity (coagulopathy).
Why get HE in ALF?
Liver unable to synthesise urea; brain detoxifies NH3 instead; produces glutamine; osmotic effect draws water in.
Grading HE?
1-4; 4 = GCS<8 ie coma.
Which two causes of ALF arguably have the poorest prognosis?
Wilsons, Budd-Chiari.
Key predictor for prognosis in paracetamol induced ALF?
Arterial lactate (strongly correlates with paracetamol levels)
Lipid abnormality in metabolic syndrome?
Raised triglycerides (not cholesterol)
Osteoporosis and obesity?
Not linked (low BMI more associated)
Features of NAFLD?
Simple steatosis, malignancy, liver cirrhosis, advanced fibrosis (not bile duct obstruction)