Liver & Friends Flashcards
Arteries of the foregut
Celiac trunk
- Left gastric
- Splenic
- Common hepatic
What does ALT test show
Assoc with hepatocellular damage
e.g. paracetamol OD with hepatocellular necrosis, viral hepatitis, ischaemic necrosis, toxic hepatitis
AST:ALT ration
If over 1 = Ischaemia
If over 2.5 Alcoholic hepatitis
GGT
Sensitive to alcohol ingestion
ALP
Elevated with
- Cholestasis
- Malignant hepatocellular damage
- Marker of bone turnover (Paget’s)
Metabolic liver diseases:
Hereditary haemochromatosis (Deficiency of iron regulatory hormone hepcidin)
Wilson’s (accumulation of copper at tissues)
A1AT deficiency (Lungs and liver, enzyme not able to leave liver)
Hereditary haemochromatosis
- Inheritence
- Mechanism
- Organs affected
- Gene
Autosomal recessive
Inc intestinal absorption of iron leading to tissue accumulation. Hepcidin deficient (blocks iron absorption when high levels detected)
- Liver: fibrosis, cirrhosis, HCC,
- Heart
- Skin (bronzing)
- Joints (arthropathy)
- Pancreas (DM)
HFE (Chr 6)
Hereditary haemochromatosis
- Symptoms
- Age of onset
- TIBC
Early: fatigue, weakness, arthralgia, erectile dysfunction
Late: bronzing, diabetes, cirrhosis, arrhythmia, arthropathy
TIBC dec, Ferritin inc, Transferrin saturated (over 45%)
Hereditary haemochromatosis Investigations
Iron studies (high ferritin, Transferring over 45% saturated) HFE genetic testing LFTs MRI: iron overload Liver biopsy with Perls stain (blue)
Rule out Ddx: CRP (other cause of high ferritin - acute phase protein)
Treatment Hereditary haemochromatosis
Venesection/phlebotomy (4-500ml weekly)
Liver transplant in decompensation
Monitor ferritin
Wilson’s
- Hepatic features
- Psychiatric features
- Neuro features
- Opthalmological features
Liver failure, hepatitis,
Severe depression
Asymmetrical tremor, ataxia, clumsiness
Kayser-Fleisher ring
Wilson’s investigations
Copper studies:
- low serum caeruloplasmin
- high 24 hour urine copper
- high free copper
slit lamp: Keyser-Fleisher
Liver biopsy: copper
MRI: density in BG
Wilson’s Treatment
Chelation agents (Penicillamine) binds copper to excrete in urine
Stop copper absorption: Zinc
Avoid copper dense food: mushrooms, liver, chocolate, nuts
Monitor: LFTs, Renal functionalists, FBC
Avoid alcohol and hepatotoxics
A1At deficiency
- Inheritence
- Mechanism
- Consider when…
Autosomal recessive
A1AT is glycoprotein in the liver which controls inflammatory cascades and balances neutrophil elastase in the lung. Deficiency = alveolar destruction
Abnormal A1AT can not leave liver, congesting liver cells.
Young person with emphysema
A1At deficiency
- Hepatic features
- Lung features (Presenting factors)
Hepatitis, cirrhosis, HCC
Dyspnoea wheeze, cough, COPD
A1At deficiency
- Investigations
- Tx
Serum A1AT low
CXR and Lung functions (Peak flow and spirometry)
Smoking and alcohol advice
Treat like COPD (LABA)
Regular LFTs, screen for HCC
A1At deficiency
- Investigations
- Tx
Serum A1AT low
CXR and Lung functions (Peak flow and spirometry)
Smoking and alcohol advice
Treat like COPD (LABA)
Regular LFTs, screen for HCC
4 Things seen with Liver failure
Jaundice
Ascites
Abnormal Bleeding (dec clotting and varices)
Hepatic Encephalopathy
(when liver loses ability to regenerate)
Toxins causing Liver failure
Paracetamol,
Alcohol,
Medications (co-amoxiclav, Abx - cipro, doxy, erythro, methotrexate, gold)
Infective liver failure
Viral hepatitis (A, B, C, E) EBV, CMV
Neoplastic liver failure
Primary HCC
Secondary
Metabolic liver failure causes
Haemochromatosis
Wilson’s
A1ATd
Vascular Liver failure causes
Ischaemia (Atherosclerosis)
Budd-Chiari (hepatic vein thrombosis - triad 1) Abdo pain, 2) Ascites, 3) Hepatomegaly)
Inflammatory Liver failure
Autoimmune hepatitis
Hepatic encephalopathy pathophys + presentation + Tx
In liver failure ammonia builds up in circulation and crosses BBB causing cerebral oedema.
Altered mood, Drowsiness, Restlessness, Coma
Lactulose (removes Nitrogen from gut), Neomycin (lower nitrogen forming bacteria)
Signs of chronic liver disease
Finger clubbing
Fetor hepaticus
Leukonychia (white nails/milk spots)
Asterixis (flap)
Spider naevi
Hypoalbuminaemia = Ascites: shifting dullness, fluid thrills
Bleeding (Factor 1972 Fit K), Fibrinogen deficiency too
In Liver failure:
FBC LFT Billirubin Ammonia Glucose Copper Paracetamol Creatinine INR Viral serology Doppler USS
FBC: Thrombocytopenia LFT: ALT + AST raised Billirubin: Raised Ammonia: Raised Glucose: Dangerously low Copper: High in Wilsons Paracetamol: high in OD Creatinine: hepatorenal syndrome = Raised INR: Raised Viral serology: viral hep, EBV, CMV Doppler USS: Budd Chiari occlusion?
Liver cirrhosis severity Classification & Markers
Child-Pugh classification
BRAIN: Bilirubin (high) Refractory ascites Albumin low < 28 INR > 1.7 eNcephalopathy
Class A = least severe
Class C = Most severe
Consider transplant early
Liver failure management
- If OD
- Ammonia
- Raised ICP (Hep encephalopathy)
- AKI (hepatorenal)
- Bleeding
- Glucose
- Ascites
- If OD (para): N-Acetylecysteine
- Ammonia: Lactulose
- Raised ICP (Hep encephalopathy): IV mannitol
- AKI (hepatorenal): Haemodialysis
- Bleeding: FFP, Pts, Vit K
- Glucose: IV glucose
- Ascites: Diuretics, low salt
Liver transplant complications
Hepatorenal syndrome
Infection/sepsis - spontaneous bacterial peritonitis
Cerebral oedema
Haemorrhage form oesophageal varices
Ascites:
- Def
- Complications
- Cause (4)
- Presentation
Fluid collection in peritoneal cavity due to low oncotic pressure (hypo albumin)
Infection (SBP), Hepatorenal syndrome
75% cirrhosis (dec oncotic, portal hypertension - inc hydrostatic)
15% malignancy (GI tract, ovarian)
Heart failure
Nephrotic syndrome
Abdo distension + Umbilical herniation, dyspnoea (impaired lung function), weight gain.
Ascites:
- Investigation
- Management
- Complications
- Examination: Shifting dullness, fluid thrill (large ascites)
- LFT: look for cirrhosis
- Abdo USS (Ca Ovary, Liver mets)
- CXR (HF, pleural effusion)
Tx cause
Diuretics: Spironolactone (beware hyperkalaemia)
Paracentesis (symptom relief)
TIPS (transjug intraheaptic shunt)
SBP, Hepatorenal syndrome
Spontaneous bacterial peritonitis
- Def
- Symp
- Investigations
- Organism
- Tx + prevention
Intrabdo sepsis with 20% mortality
Fever, abdo pain (peritonism: gourding, rebound tenderness, pain on palpation), vomiting.
FBC (leukocytosis), LFT, U&E (hepatorenal), blood cultures.
Diagnostic paracentesis (culture and amylase)
Imaging: AXR (upright) and CXR
E.coli, Strep, enterococci
IV 3rd gen cephalosporin.
Prophylactic Abx
Precipitants for hepatic encephalopathy
AKI Infection Constipation Sedatives Diuretics
Hepatorenal syndrome
- Assoc
- Precipitants
- Pathophys
End-stage liver disease with ascites.
Events lowering BP e.g. SBP, GI bleeding.
Splanchnic Vasodilation drops BP, activates SNS and RAAS
Hepatorenal syndrome Diagnostic criteria
Cirrhosis with ascites
Creatinine over 133 micro mol
No nephrotixics
Hepatorenal syndrome management
Admit to HDU, monitor urine output, stop diuretics
Splanchnic vasoconstrictors e.g. terlipressin with albumin
TIPS - reduces ascites in portal HTN
Cirrhosis
- Def
- Complications
- Causes
Fibrosis converting Liver architecture to nodules
hepatic/portal HTN (oesophageal varices), dec synthesis (clotting factors, albumin)
Common: Alcohol, Hep B/C, NAFLD, NASH (Non-Alp steatohepatitis
Uncommon: AI hep, PBC, PSC, sarcoidosis, Haemochromatosis
Cirrhosis
- RF
- Pathophysiology
Alcohol, Hepatitis, Obesity, T2DM
Cytokines activate stellate cells i space of disse
Normal Liver replaced with collagen
Loss of fenestration/sinusoid = imparted function Blood flow
Signs (FLAPS) and symptoms Cirrhosis
& Decompensated
Occur when 80% parenchyma destroyed - may be asymptomatic
Fatigue, malaise, anorexia, weight loss, gynaecomastia (inc oestrogen conversion as testosterone synthesis drop)
Signs: FLAPS: finger clubbing, Leukonychia, Asterixis, Palmar erythema, spider naevi)
Decompansated: Oedema, ascites, bruising, poor memory, Variceal bleeding, SBP
Portal HTN signs
Ascites, splenomegaly, caput medusae (veins from umbilicus), hematemisis
Investigating Cirrhosis
- general
- for cause (Viral, Alc, NASH, Metabolic, AI)
LFT: AST + ALT raised, GGT in alc, ALP + Bilirubin (PBC, PSC)
Albumin: low
FBC: Macrocytosis (alc)
U&E: Hig Cr - Hepatorenal
Imaging: USS, CXR (pleural effusion from ascites)
Biopsy: Gold standard for diagnosis (nodular, bridging fibrosis)
Viral screen: Hep B/C
Alc: GGT, MAcrocytosis, Carbohydrate deficient transaminase
NASH: fasting glucose
Metabolic: AIAT, Caeruloplasmin, transferrin sats (TIBC)
AAb screen - antimitochondrial
Cirrhosis management
Delay progress, treat cause and complications
Alcohol abstinence
Antihistamines (pruritus)
Prophylactic ciprofloxacin (SBP)
Monitor Oesophageal varies and HCC
Transplant is the only cure
Portal HTN
- Def
- Causes
Abnormally high hepatic portal vein pressure
Pre-hepatic: Portal thrombosis, Compression (e.g. tumour)
Hepatic: Cirrhosis, hepatitis, Sarcoid granuloma
Post-hepatic: Budd-Chiari, RHF/Congestive HF,
Portal HTN pathophysiology
Complication
Risk of TIPS
Due to either inc vascular resistance or inc blood flow
Pressure goes back to veins draining into portal vein
Causes varices e.g. in Gastro-oesophageal vein
May cause encephalopathy due to toxins bypassing liver
Portal HTN signs
Ascites, splenomegaly, dilated umbilical veins, signs of liver failure
Haematemisis, melaena (bleeding varices)