acute liver failure in children
TRANSCRIPT
Giorgina Mieli-Vergani
Paediatric Liver, GI & Nutrition Centre
King’s College London School of Medicine
King’s College Hospital
London, UK
Acute Liver Failure
in Children
< 1960s ? liver disease in children
1970s liver disease in children
1980s tertiary centres
1990s liver transplant
Paediatric Hepatology: a young subspecialty
Acute liver failure in childhood
rare
… but pathology different from adults
… a paediatric hepatologist’s headache
definition
management
borrowed from
adult experience
Acute liver failure
Fulminant liver failure
versus
Definition?
Acute/Fulminant liver failure in childhood
important for treatment decision
important for result comparison
massive liver necrosis with encephalopathy
developing within 8 weeks from the first
signs of illness in a patient without
underlying chronic liver disease
Fulminant hepatic failure in adults
massive liver necrosis with encephalopathy
developing more than 8 weeks from the first
signs of illness in a patient without
underlying chronic liver disease
Late onset (subacute) hepatic failure in adults
Encephalopathy
often late, terminal event
Acute liver failure in childhood
difficult to diagnose,
particularly in infants
the most common presentation is
subacute
Acute liver failure in childhood
if encephalopathy is a major
criterium for definition…
King’s prognostic indicators (non paracetamol patients)
Fulminant hepatic failure
prothrombin time > 100 sec (irrespective of grade of encephalopathy)
or
any 3 of the following variables (irrespective of grade of encephalopathy):
age <10 or >40 years
nonA-nonB, halothane, idiosyncratic drug reactions
jaundice to encephalopathy > 7 days
prothrombin time > 50 sec
bilirubin > 300 mmol/l
O’Grady et al, Gastroenterology 1989;97:439-45
Underlying liver disease
Acute liver failure in childhood
frequent in paediatrics
tyrosinaemia
neonatal haemochromatosis
Wilson
autoimmune
mitochondrial disorders
etc
King’s Definition - 1996
Multisystem disorder in which severe acute
impairment of liver function, with or without
encephalopathy, occurs in association with
hepatocellular necrosis in patients with no
recognised underlying chronic liver disease
Acute liver failure in childhood
Bhaduri & Mieli-Vergani, Sem Liver Dis 1996;16:349-355
no known evidence of chronic liver disease
biochemical evidence of acute liver injury
hepatic-based coagulopathy (not corrected
by vitamin K):
PT > 15s or INR > 1.5 with encephalopathy
or
PT >20s or INR >2.0 with or without
encephalopathy
Acute liver failure in childhood
Acute Liver Failure Study Group, USA -1996
ALF Symposium, London 2005
Acute hepatocellular injury with severe impairment
of liver function
(INR >2, not responsive to vitamin K),
with or without encephalopathy in patients without
known underlying liver disease
Acute liver failure in childhood
Acute liver failure in childhood
without underlying liver disease
with underlying liver disease
different prognosis and management
Acute liver failure in childhood
Liver transplant
what criteria should be used?
Acute liver failure in childhood
adult criteria?
aetiology based criteria
Criteria for liver transplant
Transplant
if cause of ALF treatable by LT
if predicted outcome of LT better
than that of underlying disease
if no severe brain damage
Acute liver failure in childhood
Acute liver failure in childhood
encephalopathy → poor prognosis
young children may die with no obvious
encephalopathy
without underlying liver disease
with underlying liver disease
Acute liver failure
response to medical treatment possible
even in the presence of encephalopathy
(e.g. mitochondrial disorders)
prognosis and management depend
on the cause of underlying liver disease
Acute liver failure in childhood
prognostic criteria
other than
encephalopathy
are needed
When to list for transplant?
15 survived
29 died
Acute liver failure in childhood
King’s: 44 children with ALF not transplanted
…prognostic indicators?
Bhaduri & Mieli-Vergani, Sem Liver Dis 1996;16:349-355
Indicators of poor prognosis
Acute liver failure in childhood
age < 2 years
max INR ≥ 4
max bilirubin ≥ 235 mmol/l
WBC ≥ 9x109/l
Prognostic indicators Acute liver failure in childhood
age, max INR, max bilirubin, WBC
% mortality
any 1 indicator 76
any 2 indicators 93
any 3 indicators 96
all 4 indicators 100
Prognostic indicators King’s: 44 children with ALF not transplanted
aetiology
presence of encephalopathy
Acute liver failure in childhood
no correlation with:
correlation with: max degree of encephalopathy grade I-II = 44% mortality
grade III-IV = 78% mortality
P<0.02
Acute liver failure in childhood
Prognostic indicators - INR
dead
alive
P<0.001
0
5
10
15
20
25
INR < 4 INR ≥ 4
still valid with improved
paediatric intensive care?
impossible to determine in
the era of transplantation
Acute liver failure in childhood
King’s prognostic indicators
potential for the liver to regenerate
lifelong immunosuppression if LT
Acute liver failure in childhood
Ethical dilemma if no underlying liver disease
extra-corporeal assist devices
hepatocyte transplantation
Acute liver failure in childhood
New approaches
auxiliary liver transplantation
Auxiliary liver transplant
Acute liver failure – Auxiliary transplant
Acute liver failure – Auxiliary transplant
time 0
6 months
18 months
Acute liver failure – Auxiliary transplant
1 month
6 months 18 months
24 months
survival 85%
off drugs 29%
weaning 53%
Acute liver failure – Auxiliary transplant
Hepatocyte transplant for
acute liver failure
transient synthetic and detoxifying function
site accessible in coagulopathic patients
no immunosuppression
2.5 x 106 cells/ml
Alginate beads
~400-450µm
Encapsulated hepatocytes
liver
Site of injection
Hepatocyte transplant for
acute liver failure
peritoneum
spleen
before Tx retrieved microbeads
Hepatocyte in alginate beads
for acute liver failure
First human application – King’s
Herpes simplex FHF
hepatocyte transplant
aged 2 weeks – March 2011
“Liver implant gives boy another chance of life” NEWS
8 months
5 patients
Herpes simplex 1
neonatal haemochromatosis 2
indeterminate 2
Hepatocyte in alginate beads
for acute liver failure
King’s, 2011-13
outcome
2 alive without liver transplant
2 bridge to liver transplant
1 care withdrawn
(Down syndrome with cardiac failure, stable INR)
clinical condition improved in all
early referral to specialised centres
transplant when necessary
Acute liver failure in childhood
The message – The future
Rx related to aetiology
development of effective bridges
to recovery