Download - Acute Liver Failure Update
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Acute Liver FailureA Management Update
From Comatose Confusion to Clarity
Palepu B Gopal
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Survival Rates by Era for ALF at King’s College Hospitalwith grade 3 or 4 encephalopathy, regardless of management
Potentially and Increasingly Reversible Condition
TRANSPLA
NTATIO
N
CRITICAL CARE+
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Definition Evidence of coagulation abnormality (INR 1.5), any degree of encephalopathy without preexisting cirrhosis and with an illness of <26 weeks’ duration
Prognosis Prior to transplantation < 15% survivalCurrently overall short-term survival (one year) including those undergoing transplantation is greater than 65%
Acute Liver Failure AASLD Definition and Prognosis
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Bernal W et al Lancet 2010Mindikoglu AL et al Liver Transpl 2009Khuroo MS et al. J Viral Hepat 2003Acharya SK et al. J Gastroent Hepatol 2002
Etiology of Acute Liver Failure
Non-Paracetamol drug Induced ALF requiring
Emergency LTx USA 1987–2006
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ALF– A Multi-Organ Failure SyndromeAcute Liver
Failure
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O’Grady et al, 1993; Ellis et al, 1995
Types Jaundice-encephalopathy
Cerebral edema
Prognosis Leading causes
Hyperacute <7days Common Moderate Virus A,B,Eacetaminophen
Acute 8-28days Common Poor Non A,B,C and drugs
Sub-acute 29 days -12weeeks
Infrequent Poor Non A,B,C drugs
Late onset 8weeks-24weeks
Infrequent poor Non A,B,Cdrugs
Classification of Acute Liver Failure
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Predicting Outcomes in Acute Lifer Failure
• Important predictive factorStage of encephalopathy
• Suggested laboratory markers: Factor VAFPSerum Phosphate VII/V ratio > 30Gc globulin
• Four factors Etiology of ALF INR, bilirubin Encephalopathy and brain edema Multiorgan failure
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John O’Grady. Clin Liver Dis 11 (2007) 291–303
Acharya SK et al . Hepatology 23: 1996
Variables Used for Prognostic Models of ALF
King’s IndianMELDClichy
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Model for End-stage Liver Disease (MELD) Score
Presence of > 3 factors – 90% Mortality
Clichy- Villejuif Criteria from France
Criteria from India Acharya SK et al . Hepatology 23: 1996
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United Network for Organ Sharing (UNOS)
Status 1 - most urgent level
• Rapid development of grade 3 - 4 encephalopathy
• Prothrombin time > 25 sec
• On vasopressors or ventilatory support
• Are expected to live less than 7 days without a transplant
• Inborn error of metabolism with metabolites that are
toxic to the CNS
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sensitivity specificity
King’s College Criteria 92% 69%
APACHE II 92% 81%
Clichy Criteria Vs KCH Criteria• 81 non-paracetamol & nontransplanted patients from
French ICU - mortality was 81% • When Clichy and KC criteria were applied at admission
data, predictive Mortality by – Clichy was 60% and – KC was 80 %
• Nonspecific liver function tests lactate & phosphate
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45. Currently available prognostic scoring systemsdo not adequately predict outcome and determinecandidacy for liver transplantation. Reliance entirelyupon these guidelines is thus not recommended.(III)
2. Contact with a transplant center and plans totransfer appropriate patients with ALF should beinitiated early in the evaluation process (III).46. Urgent hepatic transplantation is indicated inacute liver failure where prognostic indicators suggesta high likelihood of death (II-3)
47. Living donor or auxiliary liver transplantationmay be considered in the setting of limited organ supply,but its use remains controversial (II-3)
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• OLT is the definitive treatment for those who meet the criteria
• 1 yr. and 5 yr . survival of patients undergoing
OLT for ALF is about 20% lower than cirrhotics
• Post ALF OLT Survival rates
USA 63%
Europe 61%
Individual centers 59% to 79%
• Better prognosis: Paracitomol, HAV, ischemia, AFLP
• Worse prognosis: HBV, AIH, Wilson’s, Bud-Chiari
Liver Transplant for ALF
John O’Grady. Clin Liver Dis 11:2007Toru Ikegami et al. J Am Coll Surg 2008
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Douglas G. Farmer et alANNALS OF SURGERYVol. 237 : 2003
Liver Transplant for FHF – 17 Yrs and 200 Patients
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Variations of Liver Replacement Therapy
Transplantation : Orthotopic LT
DDLT or LDLT
Auxiliary liver transplant
Split Liver TransplantT
Two-stage procedures : Hepatetctomy followed later by OLT
Non-Transplanta Therapies
Xenotransplantation
Hepatocyte Transplantation
Hepatic Assist Devices
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Contraindications to LTx in FHF• Un-controlled sepsis with MOF
• Extra hepatic malignancy
• Irreversible brain damage
- neurologic exam
- imaging studies
- sustained ICP >50 or
- CPP <40 for > 1-2hrs
• Respiratory - ALI/ARDS PEEP >12 and FiO2 >60%
- Pulmonary arterial hypotension(MPAP >40mmHg)
- Intrapulmonary shunt (HPS) paO2/FiO2 <100
• Functional status - Bedbound >10 days
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Liver Support / Assist DevicesBio-Arteficial HybridArteficial
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Use of MARS in Liver Failure
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may worsen coagulopathy and bleeding
may cause hypoglycemia
alter PK of antibiotics and antifungals
Artificial and bioartificial support systems for liver failure
Liu JP, Gluud LL, Als-Nielsen B, Gluud C
Acute-on-chronic liver failure may benefit from treatment with the more recently developed artificial support systems. The evidence for ALF seemed less conclusive.
Improves Bilirubin levels
Improves Encephalopathy & CBF
Variable effects on ICP
Decreased serum Cu+ in Wilson’s
Improves pruritus
Improves renal function
Improves hemodynamics
Molecular Adsorbent Recycling SystemMARS
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Bioartificial liver support- Hepatocytes ± Filters ± Oxygenator
Detoxification, biosynthesis and regulation
Artificial - Filters ± Adsorbers
Only detoxification
CVVHD
Hemadsorption
Plasmapheresis
Meta-analysis of 4 RCTs - No survival benefit with MARSAASLD 48 Not recommended
Future (II-1)LADs only in Clinical research setting
On AoCLF rather than ALF
Bridge to transplantation
Liver support devices J Phuaa and KH Lee.Curr Opin Crit Care 14:208–215
‘Is there life in MARS?’
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acute on chronic liver failure MARS therapy, clinical trial results showed a not statistically significant reduction in mortality (odds ratio [OR] =0,78; [CI] =95%: 0,58 – 1,03; p= 0,1059,
A non-statistically significant reduction of mortality was shown in patients with ALF treated with MARS (OR = 0,75 [CI= 95%, 0,42 – 1,35]; p= 0,3427)
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EncephalopathyIn the presence of cerebral edema,Maintain the head in neutral position and elevated to 30 degrees.Ventilate patient maintaining PCO2 between 30 and 40 mm Hg
Fluids and vasopressors may be used to achieve CPP goalLactulose (PR or NG) to keep serum ammonia <50 mcg/dL If serum ammonia is >50 mcg/dL despite adequate stool output with lactulose,
RifaximinCVVHD with serum ammonia goal >200 mcg/dL
Neomycin not recommended by ALFSG because of nephrotoxicityCT Head Stage 3-4 HE or focal deficits
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Seizure Prophylaxis and Surveillance• Nonconvulsive seizure activity is common
o Prophylactic antiepileptics not recommendedo EEG when:
Grade II/IV encephalopathy Sudden neuro deterioration Myoclonus To titrate use of barbiturates
• Treatmento Phenytoino Propofol o barbiturateso Fosphenytoin o low-dose benzodiazepine
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Management of Cerebral Edema / Raised ICP• Manitol: first line therapy 0.5g/kg– Only if serum osmolality < 320 mosmol/l
• Thiopentone infusion -Barbiturate coma– Anti-oxidant, decreases CMRO2, anticonvulsant
• Strong sodium (1)– Even if serum osmolality is high– Target Na level 145 -150
• Acetylcysteine– Decreases incidence of cerebral edema but increases CMRO2
• Specific managemento Induced hypothermia (32-33ºC)o Indomethacin: 25mg IV over 1min.
• Hyperventilation • Corticosteroids – No Role (1)
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7 -30 % NaCl : Maintain S. Na 145 – 155:Monitor S. Osmolality
High ICP Surges Hypertonic saline & Mannitol infusion
Most important Tts of cerebral edema
Increases colloid osmotic pressure in the cerebral capillaries Reduces Interstitial water content.
Reduces ICP
Improves cerebral perfusion
CMRO 2 and lactate
Murphy et al. Hepatology. 2004
Role of Hypertonic Saline in Management of HE
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Intracranial Pressure Monitored VsNon- Monitored GroupHigher medication Utilization in Monitored Group
Brain Edema in Liver Failure Andres T Blei. Critical Care Clinics 2008
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ICP MonitoringICP bolts May be useful to optimize CPP
Extra-dural system preferredLowest complication with Epidural
Risk : benefit ICP/CPP measurement vs. Sepsis and bleeding
Have not been shown to improve survivalALF G: 10% Incidence of bleeding 10%
No Randomized control Trials
Surrogate markers of CBF Transcranial Doppler Near infrared spectroscopy IJV oxygen saturation Cerebral microdialysis
ICP monitoring is only used in hyperammonemia above 200 mmol/l and thosewith poor prognosis and signs of systemic inflammation, by experienced
Wendon JA et al. Hepatology 2006 28
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Algorithm For ICP Monitoring
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Coagulopathy of ALF & Correction
Pts. with ALF are by definition coagulopathicSpontaneous bleeding is rareVery difficult to obtain complete correction
Vitamin K No Role, At least one dose (AASLD)Fresh Frozen Plasma Best prognostic indicator
Prophylactic FFP not recommended Does not reduce risk of significant bleeding
volume overload ALFSG recommends aiming for: INR 1.5
Platelets Limited role for prophylactic transfusionIf clinically significant bleeding or < 10 - 20,000/mm3ALFSG recommends aiming for Plts. 50,000
Cryoprecipitate When fibrinogen <100 mg/dL.Recombinant VII When FFP fails to correct PT/INR
Risk of hrombotic complication
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Decreased SVR and High Cardiac output
Restoration of hemodynamics
Correct hypovolaemia with Crystalloids initially
Once euvolemic, studies show albumin is better
Pressors Noradrenaline is the agent of choice
Vasopressin not recommended as it increases ICP
Low-dose terlipressin
Inotropes Low CO syndromes carry poor prognosis
dopamine or dobutamine, Adrenaline
Adrenaline may compromise HBF
No proven benefit of NAC, prostaglandins and steroids
Hemodynamic Failure
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Renal Issues of ALF• AKI and Renal Dysfunction common
Hypovolaemia
Hepato-Renal Syndrome
Acute tubular necrosis
• Protect and maintain renal functions by m
• Optimize volume
• Optimize hemodynamics
• Avoid nephrotoxic agents
• Infection and Sepsis Management
• Renal Replacement Therapy
• Renal failure
• Fluid overload
• Severe hyperammonemia
• Severe Lactic Acidosis
•CRRT preferred over IRRT
• Anticoagulation
Usually not needed
Use citrate over heparin
Monitor ionized calcium
• Bicarb buffer over lactate or citrate buffer
• Avoid hyponatraemia
AASLD 40. If dialysis support is needed for acute renal failure, it is
recommended that a continuous mode rather than an intermittent mode be
used (I).
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General Supportive Measures
● Monitor blood glucose 2-hourly and maintain between 140 to 180mg%.
● Monitor serum electrolytes and correct
● Nutrition— Early NG feed with gradual increase in protein
• AASLD No38: H2 blocking agents or proton pump inhibitors (or sucralfate as a second-line agent) for acid-related gastrointestinal bleeding associated withstress (I).
●
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AASLD 2011 Recommendation 12 :NAC may be beneficial for ALF due to drug-induced liver injury (I)
NAC is infused in a 3 stage iv infusion
Total dose of 300 mg/kg of over 20 hours
First Infusion 150mg/kg in 200mL of 5% D over 15 to 60 mins
Caution : anaphylactoid reactions.
Second Infusion 50mg/kg in 500mL of 5% D over the next 4 Hrs
Third Infusion 100mg/kg in 1 Lof 5% gluc over next 16 Hrs
n-Acetyle Cystine
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NAC Administration
Mix 30gm of NAC in 1Lt of 5%Dextrose
Patient treated <8hrs after acute
ingestion
Patient treated >8hrs after acute ingestion
Loading dose 150mg/kg in 1hr Loading dose 150mg/kg in 1hr
Run infusion at 15mg/kg/hr for 4 hrs
Run infusion at 15mg/kg/hr for 44 hrs
Cont. infusion at 7.5mg/kg/hr for 16hrs
NAC -140 mg/kg orally followed by 70mg/kg every 4 hrs for 72 hrs
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Anti-Viral Treatment Improves the Prognosis of Fulminant Hepatitis B
No 14. Nucleos(t)ide analogues should be considered for Hep B-associated ALF and for prevention of post-LT recurrence.(III)
Cumulative Survival for Patients treated with Lamivudine and
withoutInt Med 47: 2008
No 15. Patients with known or suspected Herpes Virus or varicella zoster as cause of ALF should be treated with acyclovir and may be considered for Transplantation (III).
AASLD Recommendations
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Standard ATT isoniazid , rifampicin, ethambutol, and pyrazinamideINH and PZA Hepatotoxic and may lead to ALFDilemmas? ATT when to stop?
When to restart What to do in case OLT and immunosuppression ?
After LT Standard ATT can no longer be usedAvoid RIF Hepatotoxic
interferes with immunosuppressantleads to acute rejection
Avoid PZA due to it’s hepatotoxicity
After improvement of hepatic function, second-line ATT can be usedalternative nonhepatotoxic ATT drugs: Ofloxacin , ciprofloxacin ,
Moxifloxacin , and amikacin Possible anti-TB regimen INH + ETH + FQ (MOX) ± Amikacin
Ichai Et Al .Liver Transplantation, 2010
Anti-Tuberculous Therapy – ALF & Transplantation
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Infections
Bacterial (90%): Gram Neg. organisms & Staphylococci
Fungal (30%)
Prophylactic antibiotics? Decrease rate of infections
But no improvement in outcomes (III)
Empirical ATBs are recommended by ALFSG & AASLD when:o Surveillance cultures reveal significant isolateso Advanced stage (III/IV) encephalopathy (III)o Refractory hypotensiono SIRS
Prophylactic fluconazole - with multiple-site colonization with yeast
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Other Issues
SteroidsNo19. Patients with coagulopathy and mild HE due to autoimmune hepatitis may be considered for corticosteroid treatment (prednisone 40-60 mg/day) (III)
No 20. Patients with autoimmune hepatitis should beconsidered for LTx even while corticosteroids are being administered (III)
AASLD Recommendations
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ConclusionsTransplantation is a definitive treatment for ALFGood quality critical care and aggressive transplant
programmes have improved survival of ALF Early etiological diagnosis and aggressive managementOptimal referral to Transplant unit to
Improve Survival, and Economize on organ pool
LAD devices are not of proven benefitConservative Blood product usageFurther prognostication tools are neededWatch the space for guidance from AASLD and ALFG
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Suggested Reading
1. Acute liver failure. Bernal W, Auzinger G, Dhawan A, Wendon J.. Lancet 2010;
376:190–201.
2. Acute liver failure. Fin Stolze Larsen and Peter Nissen Bjerring.
Current Opinion in Critical Care 2011, 17:160–164
3. AASLD Position Paper : Introduction to the Revised American Association for the Study of Liver Diseases Position Paper on Acute Liver Failure 2011
William M. Lee, R. Todd Stravitz, and Anne M. Larson
4. Modern Management of Acute Liver Failure.
John O’Grady. Clin Liver Dis 11: 2007
5. Intensive care of patients with acute liver failure: recommendations of the U.S. Acute Liver Failure Study Group.
Stravitz RT, Kramer AH, Davern T, Shaikh AO, Caldwell SH et al.
Critical Care Medicine 2007; 35: 2498-508