metabolic liver disease. hpi 17 year old female presents with a 6 day history of increasing fatigue...
TRANSCRIPT
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Metabolic Liver Disease
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HPI• 17 year old female presents with a 6 day
history of increasing fatigue and diffuse abdominal pain
• Dark colored urine, icteric sclera and recent onsent of pruritis
• Denies fever, emesis, diarrhea and chills.
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• PMHx
– Epilepsy (GTC) since 8 years old
• Medications: Zonisamide, Trileptal
• Allergies: Tegretol (rash)
• Family Hx
– Non-contributory
• Social Hx
– Increasingly poor school performance
– Denies sexual activity, alcohol and drugs
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Laboratory• Total bilirubin 25.2, conjugated 13• Total protein 5.1, albumin 2.8• Amylase 53, Lipase 45• Ammonia 68• AST 86, ALT 42, ALP 82• Hemoglobin 11.7• PT 24.1, PTT 43, INR 2.26• Abdominal Ultrasound
– Gallbladder wall thickening – Normal CBD– Unremarkable liver and pancreas
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Physical Exam• General: tired, easily aroused• HEENT: icteric sclera• CV: I/VI SEM at LSB, no radiation• Resp: no findings• Abdomen: soft, hepatomegaly 4 cm below
rcm, no palpable spleen, NABS, no mass• Derm: jaundice• Neuro: answering questions appropriately
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DIFFERENTIAL DIAGNOSIS
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Acute Liver Failure: Infant
Infections Drug/Toxin Cardiovascular Metabolic
Herpes simplexEchovirusAdenovirusEBVHepatitis BParvovirusCMV
ECMOHypo. left heartShockAsphyxiaMyocarditis
GalactosemiaTyrosinemiaIron storageMitochondrialHFIFatty Acid Ox.Niemann-Pick
No clear etiology in at least 63% of cases
Tylenol
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Acute Liver Failure: Child
Infections Drug/Toxin Cardiovascular Metabolic
Hep A,B,C,DEBVCMVHerpesLeptospirosis
Valproic acidIsoniazidHalothaneTylenolMushroom PhosphorusASA
MyocarditisHeart surgeryCardiomyopathyBudd-Chiari
FA oxidationReye SyndromeLeukemiaAutoimmune1-Antitrypsin
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Acute Liver Failure: The Adult
Infections Drug/Toxin Cardiovascular Metabolic
Hep A,B,C,D,EYellow feverDengue FeverLassa Fever
TylenolTetracyclineHalothaneValproic AcidMAO InhibitorsIsoniazidBacillus cereus
Budd-ChiariAcute failureHeat strokeShock
Fatty LiverWilson’sAutoimmune
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• Viral, bacterial and stool cultures sent
• Started Vitamin K and Ursodiol
• Repeat abdominal ultrasound– Hepatosplenomegaly– Normal doppler
• Became more lethargic, developed peripheral edema, tachycardia, tachypnea and hypotension
Hospital Course
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Hospital Course
• Hemoglobin steadily falling 11.7 to 8.8
• Reticulocyte count 6.6%
• Increasing total bilirubin, peak 43.7
• GGT peaked at 325
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What would you do?
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• CMV, EBV negative
• Hepatitis A,B,C negative
• Autoimmune markers negative
• Copper 120 (nl)
• Ceruloplasmin 3 (low)
• Low factor levels
Further Analysis
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Pathology – H&E
• Peri-portal fibrosis• Peri-portal glycogenated
hepatic nuclei• Kupffer cell hyperplasia• Hepatocyte enlargement
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Pathology – H&E
• Hepatic steatosis– Microvesicular then
macrovesicular
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Copper Stain
• False positive – Cholestatic liver disorders– Indian Childhood Cirrhosis
• False negative– Copper not present in
hepatocyte– Released secondary to cell
injury– Cytosolic copper more difficult
to appreciate than granular lysosomal copper
Copper = 1153 μg/g dry weight
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WILSON’S DISEASE
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Copper Physiology
• Most abundant in unprocessed wheat, dried beans, peas, shellfish, chocolate, liver, kidney– Impair copper absorption
• Zinc, cadmium, ascorbic acid• Vegetarian diet
– Aid copper absorption• Gastrointestinal secretions
• Absorbed copper is bound to the protein metallothionein or complexed to amino acids and transported into portal system
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Copper Metabolism
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Copper Metabolism• Copper is transported into hepatocytes by the human
copper transporter (hCTR)
• In hepatocyte, copper interacts with the ligands metallothionein, glutathione and HAH1– Bind and detoxify excess copper– Transfer or store copper– Provide copper to chaperones
• Chaperones incorporate copper into essential proteins or assist in copper excretion into bile – CCS– COX17– ATOX/HAH1
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Copper Metabolism
ATP7B sorts copper and incorporates into secretory vesicles and ceruloplasmin
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ATP7B• Copper transporting P-
type ATPase• 13q14-13q21• 21 exons• 6 cysteine-rich copper
binding sites• 8 transmembrane
domains
• Makes copper available for ceruloplasmin synthesis and transport of copper into vesicles
Copper transporting P-type ATPase
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ATP7B
• >200 mutations identified
• Most small deletions or missense mutations– Missense: neurologic and later presentation– Deletions: hepatic and earlier presentation
• Highly expressed in liver and kidney
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Clinical Presentation
Age Hepatic symptoms
Neuropsychiatric
symptoms
< 10 years 83% 17%
10-18 years 52% 48%
> 18 years 24% 74%
Combined date from Walshe and Scheinberg & Sternleib
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Hepatic• Acute hepatitis
– 25%• Fulminant hepatic failure
– Liver transplant– May also present after discontinuing copper chelation
• Chronic active hepatitis– 10-30%– Absence of other symptoms in Wilson’s patients
should prompt biochemical screening in those <40 years
• Cirrhosis– Absence of other symptoms in Wilson’s patients
should prompt evaluation >4 years
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Laboratory
• Mildly elevated serum aminotransferase levels
• Low alkaline phosphatase
• Serum alkaline phosphatase to total bilirubin ratio ratio < 2
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Neuropsychiatric• 40-45% as presentation• Most common 2nd to 3rd decades of life• Extrapyramidal and cerebrellar dysfunction• Migraine headaches• Seizures
– Denning et al found 13 of 200 patients with Wilson’s disease had seizures
– Prevalence rate 6.2%, exceeding epilepsy frequency by tenfold
• Gait disturbances secondary to tremor and dystonia
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Imaging
• CT abnormalities– 73% ventricular dilation– 63% cortical atrophy– 55% brainstem atrophy– 45% hypodensity in basal ganglia– 10% posterior fossa atrophy
Williams and Walshe
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Kayser-Fleischer Ring• Superior poles of cornea, then
inferior involvement • Copper chelators result in
resolution over 3-5 years• Occurs after hepatic saturation
of copper– Virtually always present
when neurological or psychiatric symptoms develop
– Frequently absent in children without neurolgic involvement but with hepatic symptoms
• False positive: hepatitis, cholestasis, primary biliary cirrhosis, TPN
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Sunflower Cataract
• Copper deposition in anterior and posterior lens capsule
• False positive with foreign body lodged intraocularly (chalcosis)
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Other• Renal
– Proximal renal tubular dysfunction (Fanconi’s syndrome)
– Renal insufficiency– Nephrocalcinosis
• Hematologic– Coombs negative
hemolytic anemia
• Cardiac– Autonomic dysfunction– Cardiomyopathy
• Skeletal– Bone demineralization
• Dermatologic– Acanthosis nigrans
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Diagnostic StudiesDiagnostic
testDiagnostic
valueFalse positive False negative
Serum ceruloplasmin
<20 mg/dl Protein losing state
Hepatic failure
Aceruloplasminemia
Acute hepatitis
Pregnancy
Malignancy
Hepatic copper
>250 μg/g dry weight
(<50 μg/g)
Primary biliary cirrhosis
ICC
PSC
Liver tumors
Copper chelation therapy
24-hour urine copper
>100 μg
(<40 μg)
PSCCholestasis
Copper chelation therapy
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Genetic Analysis• Genetic studies are becoming more available but limited
• Kumar et al characterized ATP7B mutations by restriction fragment length polymorphism (RFLP)
• 3 mutations, Q1256R, A1003T and I1102T were characterized associated with restriction sites for AccII, Bsh1236I and EcoRI
• Mutation analysis in combination with RFLP is useful for positive diagnosis of asymptomatic Wilson’s disease and elucidation of carrier status
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Treatment Goals
• Reduce copper accumulation by
– Enhancing urinary excretion
– Decreasing intestinal absorption
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Therapy Oral Chelating Agents D-Penicillamine
Trientine
Ammonium tetrathiomolybdate
Many side effects
Fewer side effects
Experimental
Zinc acetate Inhibits Cu absorption
Stimulates hepatic
metallothionein
Vitamin E Antioxidant
Interferes in Vitamin K-
dependent clotting factors
Additional Recommendations Low Cu diet
Antioxidants
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Liver Transplant
• Life-saving
– Acute fulminant hepatic failure
– Decompensated cirrhosis with progressive end stage liver disease
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Wilson’s Disease
• Wilson disease is a disorder of copper transport resulting in copper deposition in multiple organs
• Clinical manifestations may be severe, but the disease is treatable if diagnosed early
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Thank you for your attention
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Hereditary Hemochromatosis
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Outline
• Hereditary hemochromatosis
• Clinical picture
• Symptom/pattern recognition
• When to offer testing
• Benefits, risks & limitations of genetic testing
• Management recommendations
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What Is Hemochromatosis ?
• Disorder of iron overload– Hereditary hemochromatosis (HH)– Acquired hemochromatosis
• HH: genetic defect in iron metabolism– Excess iron absorbed from the gut– Symptoms due to pathologic deposition of
iron in body tissue = iron overload
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Symptoms – Traditional Concept
• Classic Triad:– Cirrhosis (hepatic damage)– Diabetes (type II) (pancreatic damage)– Bronzing of skin (hyperpigmentation)
• Traditional triad means diagnosed too late!• Damage may be only partially reversible• Goal is to detect the disease BEFORE
organ damage occurs
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Non-Specific Symptoms and Signs
Liver: hepatomegaly, elevated liver enzymes Cardiac: myocardial infarction,
cardiomyopathy
Endocrine: impotence/amenorrhea, diabetes Musculoskeletal: arthritis/arthralgia Fatigue: unexplained, severe and chronic
Generally not evident until 40-60 years of age
Some patients may present earlier
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The Genetics of Hemochromatosis
• HFE– associated Hemochromatosis accounts for > 90% of cases and is the most common adult onset form:
• Autosomal recessive inheritance
• C282Y mutation– Carrier rate 1 in 7 - 10 Caucasians – Incidence 1 in 200 - 400
• Penetrance is low
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Bb
Bb
BB Bb Bb bb
Unaffected carrier
Unaffected
Autosomal Recessive Inheritance
Unaffectedcarrier
Susceptible genotype for Hemochromatosis
Unaffectedcarrier
Unaffected Carrier
Legend
B: Normal HFE gene
b: HFE gene with mutation
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The HFE Gene
• HFE gene on chromosome 6– Involved in iron homeostasis– HFE protein normally limits amount of iron uptake by
gut and regulates amount of iron stored in the tissues
• Two common mutations in HFE– C282Y allele– H63D allele
• HFE gene mutations produce altered HFE protein unable to properly regulate iron metabolism - results in an excess of iron storage in tissues
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Diagnostic testing for HH
• Transferrin saturation: – > 45% indicates significant Fe accumulation
• Serum ferritin - levels indicating significant iron accumulation:– >200 mcg/L pre-menopausal women– >300 mcg/L post-menopausal women– >300 mcg/L for men
• Liver biopsy if ferritin >1000 to assess damage
Consider genetic testing – DNA testing for common mutations (C282Y, H63D)
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Genetic Testing for HHShould be offered to those patients
with:• Appropriate clinical presentation
• Elevated transferrin saturation and ferritin
• Liver biopsy suggestive of iron overload
• First degree relative of a known case
* Must be offered to an affected family member or index case FIRST– A known mutation should be identified before
offering DNA testing to other family members
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Medical Management
• The goal - detect patients before symptoms of iron overload.
• Phlebotomy weekly or biweekly• Check ferritin every ~10 phlebotomies• Stop frequent phlebotomy when ferritin 25-
50mcg/L• Maintenance phlebotomy every 3-4 months• Dietary recommendations• Consider hematology or GI consult for confirmed
cases to guide treatment and monitoring