FULMINANT HEPATIC FAILURE · 2016. 4. 11. · FULMINANT HEPATIC FAILURE Definition “A clinical...

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FULMINANT HEPATIC FAILURE 1

Transcript of FULMINANT HEPATIC FAILURE · 2016. 4. 11. · FULMINANT HEPATIC FAILURE Definition “A clinical...

Page 1: FULMINANT HEPATIC FAILURE · 2016. 4. 11. · FULMINANT HEPATIC FAILURE Definition “A clinical syndrome characterized by encephalopathy and coagulopathy due to massive hepatocellular

FULMINANT HEPATIC FAILURE 

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FULMINANT HEPATIC FAILURE

Definition    “A clinical syndrome characterized by encephalopathy and  coagulopathy    due  to      massive hepatocellular necrosis  or  sudden  severe    impairment of hepatocellular function , in a patient without any pre‐existing  liver  disease.  It  develops within  8 weeks of the   onset of  first symptoms attributable  to  the liver disease” 

                                                        Trey‐Davidson(1970)

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FHF IN CHILDREN

• Trey Davidson’s definition not always applicable in children.

• E.g.: Chronic liver diseases like  Wilson disease, galactosemia, NH etc.  may present acutely as FHF

     Early stages of hepatic encephalopathy difficult to assess in infants  and neonates

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PAEDIATRIC ACUTE LIVER FAILURE STUDY GROUP (PALFSG)  CRITERIA

• Biochemical evidence of liver injury

• No history of known liver disease

• Coagulopathy  not  corrected  by  vitamin K 

administration.

• INR >1.5 if the patient has encephalopathy or > 2 if     

              the patient does not have encephalopathy.

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O’GRADY’S CLASSIFICATION OF FHF

Based on the time interval between jaundice and encephalopathy

•         Hyperacute  ‐  with in 1 week•         Acute            ‐  between 8‐28 days•         Subacute     ‐  between 29 days‐ 12 weeks

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 FHF: AETIOLOGY ‐ THE ABCS 

• A Acetaminophen, hepatitis A, autoimmune hepatitis 

• B Hepatitis B; bacterial diseases‐ Weil’s disease; 

septicemia; liver abscess 

• C Cryptogenic ,hepatitis C, cardiac causes‐ CCF, CCHD, shock & myocarditis

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AETIOLOGY – CONT..

• D Hepatitis D, drugs (acetaminophen, aspirin, NH, NSAIDs, valproate, halothane)

• E Esoteric causes ‐ Wilson's disease, Budd‐Chiari syndrome 

• F Fatty Infiltration – Reye’s syndrome• G Genetic diseases‐ galactosemia; HFI; Wilson

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AETIOLOGY –CONT…

• H – other Hepatitis viruses‐ HE, HG, TTV, Herpes simplex

• I ‐ Infiltration – leukemia, neuroblastoma, hepatoblastoma

• I ‐ Ischemic hepatitis‐ shock due to any cause

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FHF –AETIOLOGY (CONT..)

• Toxins

• Aflatoxin

• Amanita phalloides

• Carbon tetrachloride

• Indigenous medicines

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HISTORY IN FHF

• Consanguinity• Sibling death due to liver disease• Contact with VH• Risk factors for HB• Drugs• Toxins• Travel history

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INFECTIVITY OF HB

1 ml blood contains‐

1 trillion viral particles

Infective dose:

Just 0.00001 ml of blood!

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RISK FACTORS OF VBH

•  Blood & blood products

•  Needle stick injury

•  Resheathing of needles

•  IV drug abuse 

•  Mouth pipetting

•  Shared tooth brush/razors

•  Ear/ nose piercing

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PHYSICAL EXAMINATION

• Evidence of CLD• Cataract: galactosemia, HFI,WD• KF ring• Liver span• Ascites• Grade  of coma• Complete CNS examination

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DAWSON’S SIGN(PALMAR ERYTHEMA)

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MONITORING LIVER SPAN

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GALACTOSEMIA

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WILSON DISEASE

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WHEN TO SUSPECT FHF IN A CHILD WITH VIRAL HEPATITIS

• Persistent anorexia

• Persistent vomiting

• Deepening jaundice

• Decreasing liver span

• Relapse of initial symptoms

• Development of ascites

• Neuropsychiatric changes19

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WHEN TO SUSPECT FHF: LAB CRITERIA

• S. bilirubin > 20 mg/dL

• Prolonged PT not corrected with vitamin K

• Very high ALT ( > 3000 IU/L), beyond 2 weeks

• Sudden fall in ALT without clinical improvement

• Leukocytosis

• Thrombocytopenia

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WHEN TO SUSPECT FHF (CONT..)

• Hypoglycemia

• Low BUN

• High ammonia

• Low albumin & fibrinogen

• Very low factor V levels

• Respiratory alkalosis

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ENCEPHALOPATHY

• Essential component for diagnosis

• Effect of HC failure on function of brain

• Accumulation of neurotoxins: ammonia, 

glutamine, short chain fatty acids, mercaptans, 

octopamine, GABA.

• Absence of neuroregulatory substances

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FHF –AETIOLOGY (CONT..)

• Toxins

• Aflatoxin

• Amanita phalloides

• Carbon tetrachloride

• Indigenous medicines

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FACTORS PRECIPITATING HE

• Constipation

• GI bleed

• Excess protein intake

• Hypokalemia, hyponatremia

• Hypoglycemia ,hypoxia

• Uremia

• Sepsis

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FACTORS PRECIPITATING HE (CONT..)

• Sedatives

• Tranquilizers

• Diuretics

• Paracentesis

• Surgical procedures

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COAGULOPATHY

• All clotting factors low except VWF& VIII

• Malabsorption of vitamin K

• Dysfibrinogenemia

• Thrombocytopenia

• Disseminated intravascular coagulation

• Prolonged PT,PTT

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ACID‐BASE IMBALANCE

• Resp alkalosis ‐ hyperventilation in early HE

• Metabolic alkalosis ‐ furesemide; hypokalemia

• Respiratory acidosis:

    Respiratory failure

    Cerebral edema

   Obstructed ET tube

    Pneumonia27

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ACID‐BASE IMBALANCE

Metabolic acidosis

•   Metabolic failure‐ accumulation of org. acids

•   Hypotension, poor perfusion‐ lactic acidosis

•   Renal failure

•   Mechanical ventilation

•   Citrated blood

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BASE LINE ESSENTIAL INVESTIGATIONS 

• CBC, Platelet count

• Blood group, Cross match

• PT,PTT, Factors V &VII

• LFT,RFT

• Electrolytes, Glucose

• Sepsis screen

• CXR , USS, EEG29

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DIAGNOSTIC INVESTIGATIONS

• Urine sugar‐ galactosemia, hereditary fructose intolerance

• Serum paracetamol levels• Wilson disease work up• Metabolic work up• Auto antibodies‐ LKM, ANA,SMA• High urine/serum succinyl acetone – type I tyrosinemia

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VIRAL MARKERS

• IgM anti HAV

• HBsAg

• IgM anticore Ab

• Anti‐delta, anti‐HCV

• PCR for HCV RNA

• Ig M anti HEV

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GENERAL MEASURES

• Blood, all secretions/excretions  potentially infective

• Protective gowns, mask

• IV, radial artery& central venous catheters

• Nasogastric tube, saline lavage

• Bladder catheterization

• Fluid chart, vital signs, daily weight

• Cardio‐respiratory monitor

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HEPATIC ENCEPHALOPATHY

• Protein  restriction ‐ 0.5g/kg/day

• Ampicillin / neomycin / rifaximin / metronidazole

• Lactulose / lactilol

• Bowel wash

• Prevention of GI bleed

• Flumazenil

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   LACTULOSE

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MANAGEMENT OF HYPOGLYCEMIA

• Frequent monitoring( every 2‐ 4 hrs)

• IV glucose 25%‐ 2ml/kg

• Maintain glucose 40‐60 mg%

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COAGULOPATHY

• Mild ( PT <18 seconds)

• Moderate (PT 18‐25)

• Severe (PT >25)

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FHF –AETIOLOGY (CONTD)

• Toxins

• Aflatoxin

• Amanita phalloides

• Carbon tetrachloride

• Indigenous medicines

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COAGULOPATHY

• Vitamin K: 0.2‐0.3 mg/kg ‐ max 10 mg

• Mild  coagulopathy ‐ no treatment

• Moderate: FFP(10 ml/kg 6 hourly)    to reduce PT to 16‐

18 seconds

• Severe: FFP(15‐20 ml/kg 6 hourly) to reduce PT to 18‐25

• Cryoprecipitate, platelet transfusion

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PREVENTION OF GI BLEED

• Ranitidine 1‐2 mg/kg/dose IV 2‐4 times/day

• Omeprazole 0.5mg/kg/dose NG         1‐2 times/day

• Sucralfate 10‐20 mg/kg/dose NG        4‐6  hourly

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RENAL DYSFUNCTION IN FHF

• Pre‐renal failure

• Acute tubular necrosis

• Hepatorenal syndrome ‐ commonest

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HYPOKALEMIA

• Injudicious diuretics

• Secondary hyperaldosteronism

• Excessive vomiting

• Nasogastric aspiration

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HYPONATREMIA

• Decreased water excretion by kidneys

• Increased ADH

• Excess use of hypotonic fluids

• Frusemide

• Restrict fluids to 75% of maintenance

• Do not correct with saline

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INFECTION IN FHF

90% have clinical  e/o bacterial  infectionFactors predisposing to infections‐•         Poor host defense•         Impaired Kupffer and polymorph function•         Low opsonins, fibronectin, complement•         Poor cough reflex•         ET tubes, catheters, venous lines

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INFECTIONS IN FHF (CONTD)

• Pneumonia‐ commonest

•  Urinary tract infection

• Septicemia

• Gram positive in 60%‐staph/strep

• Gram negative bacilli

• Fungal infections in 30%

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CEREBRAL EDEMA

• One of the most common cause of death

• ICP is above 30 mmHg

• Clinical detection difficult

• Sudden change in level of consciousness

• Anisocoria, hypertonia, seizures

• Decerebrate posturing, papilledema

• Bradycardia with rising BP

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CEREBRAL EDEMA(CONT..)

• Seen in 80% of fatal cases• Grade III‐IV encephalopathy• Raise head end 450

• Fluid restriction, IV mannitol• Avoid hyperthermia • Ventilate if HE> grade III Extradural monitors ‐ Ladd transducers Subdural monitors ‐ Gaeltec monitors

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BRAIN EDEMA FHF

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SPECIFIC THERAPY IN FHF

• N‐acetylcysteine in paracetamol poisoning

• Benzyl penicillin & thioctic acid in Amanita 

poisoning

• Acyclovir in herpes simplex

• D‐penicillamine ‐ Wilson disease

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SPECIFIC THERAPY IN FHF

• Artificial liver support

• Hepatocyte transplantation

• Liver transplantation

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ARTIFICIAL LIVER SUPPORT SYSTEM

• Molecular Absorbent Recirculating System (MARS)

• Albumin impregnated dialysis membrane and a dialysate 

containing  5% human albumin

• Removes water soluble toxins including NH3

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BIO‐ARTIFICIAL LIVER SUPPORT

• Bio‐reactors containing viable hepatocytes in culture

• Bio‐artificial Liver (BAL)

• Extra‐corporial Liver Assist Device ( ELAD)

• Berlin Extracorporeal Liver Assist Device (BELS)

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KING’S COLLEGE  CRITERIA FOR LIVER TRANSPLANTATION

• Paracetamol induced FH

• pH < 7.3 (irrespective of grade of HE)

OR

• PT >100 sec

• Creatinine >300 micromol/L or >3.4 mg%

• Grade 3 or 4 HE

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KING’S COLLEGE CRITERIA (CONT..)

Non‐paracetamol patientsPT >100 sec(INR>7) (irrespective of HE grade) Or  any 3 of these, irrespective of HE grade :•Age <10 or 40 years•PT >50 seconds (INR > 3.5)•SB >17.5 mg%•Non‐ A‐E hepatitis; halothane hepatitis ; idiosyncratic drug reactions•Duration of jaundice before onset of HE>7 days

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GOOD PROGNOSTIC FACTORS

• Age : 10 ‐ 40 years

• Hepatitis A

• Paracetamol poisoning if treated in time

• Presence of an obvious etiology

• Stage I/II HE

• Increased  alpha‐fetoproteins‐ as it is a sign of 

hepatocellular regeneration

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SURVIVAL RATE IN FH

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ETIOLOGY OF FH SURVIVAL (%)

Hepatitis AParacetamol poisoningHepatitis BNA-G hepatitisHalothane

7050402010

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CAUSES OF DEATH

• Cerebral edema

• Septicemia/fungemia

• Respiratory failure

• Hemorrhagic diathesis

• Complications of LT

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Prevention of FHF

• Hepatitis B & A vaccination

• Monitoring of patients on ATT/NSAIDs

• Avoid paracetamol over dose

• Avoid aspirin‐  Reye syndrome

• Avoid Afla toxins, amanita

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Thank You

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