The document discusses the liver, cirrhosis, and portal hypertension. It begins by describing the anatomy and functional units of the liver, including the portal triads and zones. It then discusses cirrhosis and portal hypertension in more detail. Cirrhosis is defined as scarring of the liver from long-term damage that blocks blood flow and can lead to hepatic failure and portal hypertension. The document lists various etiologies of cirrhosis including infections, liver disorders, bile duct blockages, drugs/toxins, and discusses some specific conditions in more detail. It concludes by describing the clinical features and complications of cirrhosis and portal hypertension.
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Understanding Cirrhosis and Portal Hypertension
1.
2.
3.
4.
5.
6. I, caudate lobe; II-IV theI, caudate lobe; II-IV the
left-; V-VIII the rightleft-; V-VIII the right
hemiliver
7.
8. Functional unit:Functional unit: acinusacinus
PT:PT: PV, arteriole, bilePV, arteriole, bile
ductuleductule
Zone 1Zone 1 is well O2; moreis well O2; more
resistant than zone 3.resistant than zone 3.
SinusoidsSinusoids lack BM; havelack BM; have
fenestrated endoth. Bilefenestrated endoth. Bile
canaliculi join to formcanaliculi join to form
bile ductulesbile ductules
BM: basement membrane
THV: terminal hepatic venule
PT: Portal triad
11. Cirrhosis: OverviewCirrhosis: Overview
L. processes nutrients & filter blood; controls BGL &L. processes nutrients & filter blood; controls BGL &
cholesterol, & makes coagulantscholesterol, & makes coagulants
It can regenerate: large portion can be removed. But if theIt can regenerate: large portion can be removed. But if the
damage is chr., repair fails & scars:damage is chr., repair fails & scars: cirrhosiscirrhosis
It cannot be reversedIt cannot be reversed
Goal: stop progress, by Rx underlying causeGoal: stop progress, by Rx underlying cause
Cirrhosis have serious complications like PH &Cirrhosis have serious complications like PH &
hepatopulmonary syn. It can also increase risk of HCChepatopulmonary syn. It can also increase risk of HCC
In children d. of biliary tract & inherited d. are the mostIn children d. of biliary tract & inherited d. are the most
common. Adults: alcoholcommon. Adults: alcohol
12. DefinitionDefinition
Chr. liver d.:Chr. liver d.: progressive damage & regen. ofprogressive damage & regen. of
liver parenchyma lastingliver parenchyma lasting >6mo.>6mo. It canIt can lead tolead to cirrhosis.cirrhosis.
Causes:Causes: inf., metabolic, genetic, drugs,., metabolic, genetic, drugs, idiopathic,idiopathic,
structural d., HCC & AIDstructural d., HCC & AID
Cirrhosis:Cirrhosis: scarring of Liver from injury/long-term d.scarring of Liver from injury/long-term d.
blocking BF:blocking BF: HC failure &HC failure & Portal HTNPortal HTN
Chr. Hepatitis:Chr. Hepatitis: chr. inflam. inchr. inflam. in
liver leading to cirrhosisliver leading to cirrhosis
& liver failure; persistent& liver failure; persistent
for a period of 6mofor a period of 6mo
BF: blood flow. D: disorder/diseaseBF: blood flow. D: disorder/disease
13.
14. At the end we will learnAt the end we will learn
>100 liver diseases>100 liver diseases
CLD is rare in children (1/5000)CLD is rare in children (1/5000)
CLD may beCLD may be idiopathicidiopathic
Most CLD are preventableMost CLD are preventable
Commonest c/of PH is cirrhosisCommonest c/of PH is cirrhosis
Commonest c/of HCC is HBVCommonest c/of HCC is HBV
HCV is curableHCV is curable
CLD: chr. liver d. PH: portal HTN. HCC: HC CaCLD: chr. liver d. PH: portal HTN. HCC: HC Ca
17. Autoimmune Liver DiseasesAutoimmune Liver Diseases
By autoantibodies; rare in children:By autoantibodies; rare in children: 2% of LD in2% of LD in
specialized pediatric L. centersspecialized pediatric L. centers
Broad clinical spectrum.Broad clinical spectrum. Quickly responds to steroidsQuickly responds to steroids
& immunosuppressants& immunosuppressants
CommonCommon SS:SS: tiredness & unwellness, anorexia, schooltiredness & unwellness, anorexia, school
deterioration.deterioration. HSM, abnormal LFT,HSM, abnormal LFT, autoantibodiesautoantibodies,,
characteristic livercharacteristic liver biopsybiopsy
DxDx is often byis often by exclusionexclusion. Anti-sm Ab, anti-liver kidney. Anti-sm Ab, anti-liver kidney
microsome type 1 Ab, ANA. Biopsy may be necessarymicrosome type 1 Ab, ANA. Biopsy may be necessary forfor
type & severity of L. damagetype & severity of L. damage
2 types:2 types: AIH & AI sclerosing cholangitisAIH & AI sclerosing cholangitis
18. Inherited liver diseasesInherited liver diseases
2 common are2 common are haemochromatosis & alpha-1 antitrypsin d.haemochromatosis & alpha-1 antitrypsin d.
Haemochromatosis:Haemochromatosis: excess Fe is absorbed & deposited.excess Fe is absorbed & deposited.
The commonest is hereditary. 2y HC occurs inThe commonest is hereditary. 2y HC occurs in
hemolytic a. Genetic HC affects M x5. As Fhemolytic a. Genetic HC affects M x5. As F
menstruate, are unlikelymenstruate, are unlikely to show SS till >10y afterto show SS till >10y after
MP.MP. More in N EuropeMore in N Europe
SS:SS: HM, joint p, fatigue, wt loss, darkening of skinHM, joint p, fatigue, wt loss, darkening of skin
("bronzing“), AP, loss of libido. DM & heart d. may("bronzing“), AP, loss of libido. DM & heart d. may
dev.; also cirrhosis, HCC, testicular atrophy. Blood Fedev.; also cirrhosis, HCC, testicular atrophy. Blood Fe isis
confirmatory. HC DNAconfirmatory. HC DNA test is done for screeningtest is done for screening
19. Rx.Rx. of haemochromatosisof haemochromatosis
Goal:Goal: remove excess Fe. Fe is removed by phlebotomy: ½Lremove excess Fe. Fe is removed by phlebotomy: ½L
blood is removed/w for 2-3y until Fe is reduced; thenblood is removed/w for 2-3y until Fe is reduced; then
less frequentlyless frequently
Avoid dietary Fe, most commonly offal, fortified BFAvoid dietary Fe, most commonly offal, fortified BF
cereals, Fe medicinescereals, Fe medicines
LimitLimit vitamin Cvitamin C
No alcoholNo alcohol
If HC has caused cirrhosis, the riskIf HC has caused cirrhosis, the risk
of HCC is higherof HCC is higher
Screening/6moScreening/6mo
20. Alpha-1 antitrypsin d.Alpha-1 antitrypsin d.
an imp. liver protein A1AT,an imp. liver protein A1AT, is lacking/low. Pts. canis lacking/low. Pts. can
make it;make it; but, the disease prevents entrance to blood & itbut, the disease prevents entrance to blood & it
accumulates in liveraccumulates in liver
A1ATA1AT protects lungs from damage.protects lungs from damage. The lungs becomeThe lungs become
damaged: SoBdamaged: SoB
1% COPD have it. Risk of cirrhosis is high1% COPD have it. Risk of cirrhosis is high
SS:SS: first symptoms appear usually in lungs: COPD:first symptoms appear usually in lungs: COPD: SoB/SoB/
wheezing, unexplained wt loss & barrel-shaped chestwheezing, unexplained wt loss & barrel-shaped chest AsAs
it progresses, SS of cirrhosis may appearit progresses, SS of cirrhosis may appear
A1AT in blood will confirmA1AT in blood will confirm
21. Rx.:Rx.: No cure. Replacement has been triedNo cure. Replacement has been tried
Rx COPD & cirrhosis: ABT, inhaled medications. DiureticsRx COPD & cirrhosis: ABT, inhaled medications. Diuretics
& other measures to reduce edema& other measures to reduce edema
No alcohol, smokingNo alcohol, smoking
Healthy dietHealthy diet
Flu & pneumonia vax.Flu & pneumonia vax.
Treat inf.Treat inf. asapasap. Occasionally the lungs or liver deteriorate. Occasionally the lungs or liver deteriorate
despite Rx. Lung/liver transplant may be neededdespite Rx. Lung/liver transplant may be needed
With appropriate Rx A1AT is usually not fatal. But,With appropriate Rx A1AT is usually not fatal. But,
complications a/with them can be fatalcomplications a/with them can be fatal
It is v. imp. that people with inherited LD do all they canIt is v. imp. that people with inherited LD do all they can
to stay healthyto stay healthy
22. Wilson DWilson D
AR; 1/30,000; typically in 2AR; 1/30,000; typically in 2ndnd
D (neurological 3D (neurological 3rdrd
D)D)
Mutations in ATP7B Cu translocase, a protein mainlyMutations in ATP7B Cu translocase, a protein mainly
expressed by the hepatocyte to regulate Cu. ATP7Bexpressed by the hepatocyte to regulate Cu. ATP7B
synthesize ceruloplasmin. Cu accumulates within L. Thesynthesize ceruloplasmin. Cu accumulates within L. The
severity of L damage: asymptomatic - cirrhosis. 2/3severity of L damage: asymptomatic - cirrhosis. 2/3rdrd
showshow
hemolysis., coagulopathy, & renal failure. 6% WD have ac.hemolysis., coagulopathy, & renal failure. 6% WD have ac.
LD. KF rings are seen in 50%. 50% show psychiatric-LD. KF rings are seen in 50%. 50% show psychiatric-
psychotic SS. Rx can now effectively treat & gene therapy ispsychotic SS. Rx can now effectively treat & gene therapy is
effective in animal modelseffective in animal models
Low S. ceruloplasmin & high urine Cu help to perform theLow S. ceruloplasmin & high urine Cu help to perform the
Dx in most cases, some false negatives are describedDx in most cases, some false negatives are described
Severe mutations (nonsense, frameshift) are a/with theSevere mutations (nonsense, frameshift) are a/with the
most severe d, while missense mutations (60%) show amost severe d, while missense mutations (60%) show a
variable severity & outcome. Liver biopsy is now used invariable severity & outcome. Liver biopsy is now used in
cases with ambiguous biochemical parameters & tocases with ambiguous biochemical parameters & to
23. Bile ductal blockagesBile ductal blockages
– Cong.: biliary atresiaCong.: biliary atresia
– Sclerosing cholangitis
– Gallbladder surgeryGallbladder surgery
24. Drugs & toxinsDrugs & toxins
– Paracetamol. arsenic, INHParacetamol. arsenic, INH
– MethotrexateMethotrexate
– Excess vitamin A, ironExcess vitamin A, iron
– Afla toxinAfla toxin
InfectionsInfections
– Hepatitis B, C, DHepatitis B, C, D
– Schistosomiasis, brucellosisSchistosomiasis, brucellosis
– Echinococcosis, advanced or cong. syphilisEchinococcosis, advanced or cong. syphilis
25. Indian Childhood CirrhosisIndian Childhood Cirrhosis
a CLD of children (1–3y) due to deposition of Cu in liver.a CLD of children (1–3y) due to deposition of Cu in liver. It isIt is
a non-Wilsonian Cu overload by ingested Cu occurs ina non-Wilsonian Cu overload by ingested Cu occurs in
genetically susceptible infantsgenetically susceptible infants
It had a v. high CFR before but has eventually becomeIt had a v. high CFR before but has eventually become
preventable, treatablepreventable, treatable
Now rareNow rare
CLD: chr liver d. CFR: case fatality rateCLD: chr liver d. CFR: case fatality rate
26. The commonestThe commonest surgicalsurgical c/of cirrhosis inc/of cirrhosis in
childhood is biliary atresiachildhood is biliary atresia
The commonestThe commonest medicalmedical causes arecauses are
– infectionsinfections
– alpha-1- antitrypsin Dalpha-1- antitrypsin D
– metabolic LDmetabolic LD
27. C.F. of C.L.D/CirrhosisC.F. of C.L.D/Cirrhosis
Often asymptomatic in early!Often asymptomatic in early! Start with L. failure.Start with L. failure.
Severity depends on damageSeverity depends on damage
– Early:Early: fatigue, weakness, AN, AP,fatigue, weakness, AN, AP, wt. losswt. loss
– Later:Later: jaundice,jaundice, dark urinedark urine, itching, edema, ascites,, itching, edema, ascites,
poor healing, drug toxicity, testicular atrophy, poorpoor healing, drug toxicity, testicular atrophy, poor
hair,hair, hepatic facies,hepatic facies, easy bruising; esophageal,easy bruising; esophageal,
stomach & anal varices;stomach & anal varices;
kidney failure, gall stoneskidney failure, gall stones
A small number getA small number get liver cancerliver cancer
28. CF have 2 componentsCF have 2 components
SS of Hepatocellular failureSS of Hepatocellular failure
– pallor, edema,pallor, edema, fatigue,fatigue, jaundice,jaundice, itchy skin, dark urine,itchy skin, dark urine,
ANVANV,, wt. loss, palmar erythemawt. loss, palmar erythema
– AP & swelling, pale stool, hepatic facies, spider nevi,AP & swelling, pale stool, hepatic facies, spider nevi,
pigmentationpigmentation
– testicular atrophy, poor hair, gynecomazia, poor libidotesticular atrophy, poor hair, gynecomazia, poor libido
SS of Portal HypertensionSS of Portal Hypertension
– ascites, distended vein (caput medusa), splenomegaly,ascites, distended vein (caput medusa), splenomegaly,
varices at PS junctions: hematemesis,varices at PS junctions: hematemesis, bloody/tar-bloody/tar-
colored stoolcolored stool
31. Kayser–Fleischer ringKayser–Fleischer ring
at limbus: depositionat limbus: deposition
of Cu in Descemet m.:of Cu in Descemet m.:
characteristic in mostcharacteristic in most
neuro-Wilson & 50% ofneuro-Wilson & 50% of
hepatic WDhepatic WD
Arcus senilis
38. DiagnosisDiagnosis
LFTLFT
CT, USG, laparoscopyCT, USG, laparoscopy
BiopsyBiopsy
Others:Others:
– FibroscanFibroscan
– Measuring the amount of caffeine in the salivaMeasuring the amount of caffeine in the saliva
– Measuring the pressure within the liver veinMeasuring the pressure within the liver vein
– Ascitic fluid analysisAscitic fluid analysis
39. TreatmentTreatment
Nothing cures scarNothing cures scar
Goals:Goals:
– Rx underlying causesRx underlying causes
– Preventing further damagePreventing further damage
– Rx symptoms & complicationsRx symptoms & complications
Fight inf. Vax. flu, pneumonia, hepatitisFight inf. Vax. flu, pneumonia, hepatitis
Cut down absorption of wastes/toxinsCut down absorption of wastes/toxins
FEB. Salt restrictionFEB. Salt restriction
HemostasisHemostasis
40. Liver transplant SOSLiver transplant SOS
No hepatotoxic drugsNo hepatotoxic drugs
No alcoholNo alcohol
Diet: extra calories & a generous protein to helpDiet: extra calories & a generous protein to help
liver regenerateliver regenerate
If cirrhosis is advanced limit proteinIf cirrhosis is advanced limit protein
41. PORTAL HYPERTENSIONPORTAL HYPERTENSION
Portal vein:Portal vein: SV with SMV: carries 70% of liver blood.SV with SMV: carries 70% of liver blood.
Ends in sinusoidsEnds in sinusoids
Double capillariesDouble capillaries
Raised pressure in PV >Raised pressure in PV >11mmHg11mmHg or a splenic pulpor a splenic pulp
pressure of >16mmHg. Clinically this is not measuredpressure of >16mmHg. Clinically this is not measured
directly until a TIPS is decideddirectly until a TIPS is decided
SV: splenic vein. SMV: superior mesenteric vein. PH: portal hypertensionSV: splenic vein. SMV: superior mesenteric vein. PH: portal hypertension
TIPS: transjugular intrahepatic portosystemic shuntTIPS: transjugular intrahepatic portosystemic shunt
42.
43. PH:PH: splenomegalysplenomegaly && porto-systemic shunts at:porto-systemic shunts at:
Lower end ofLower end of eophaguseophagus via GE veins:via GE veins: hemat./malenahemat./malena
AnalAnal veins:veins: hemorrhoidshemorrhoids
UmbilicalUmbilical veins:veins: caput medusacaput medusa
Abdominal wall & retroperitoneum:Abdominal wall & retroperitoneum: distended veinsdistended veins
GE: gastroesophagealGE: gastroesophageal
44.
45. Eesophageal varicesEesophageal varices
• Gastroesophageal junction to 15cm upGastroesophageal junction to 15cm up
• Slow oozing or sudden severe hgeSlow oozing or sudden severe hge
Gastric varicesGastric varices
Extension of esophageal varices or varices inExtension of esophageal varices or varices in
fundus & upper body. Can occur alonefundus & upper body. Can occur alone
Rectal varices:Rectal varices: hemorrhoidshemorrhoids
48. Aetiology of Portal HTNAetiology of Portal HTN
• IntrahepaticIntrahepatic:: 80%80%
• CirrhosisCirrhosis is the commonest; scar tissue blocks BF &is the commonest; scar tissue blocks BF &
slows liver functionsslows liver functions
•Schistosomiasis, cong. hepatic fibrosis, etc.Schistosomiasis, cong. hepatic fibrosis, etc.
• PrehepaticPrehepatic:: 20%20%
•PV thrombosis:PV thrombosis:
• extension of obliterative process of umb. veinextension of obliterative process of umb. vein
• omphalitis (in newborn)omphalitis (in newborn)
• PosthepaticPosthepatic (rare): cons. pericarditis, tricuspid(rare): cons. pericarditis, tricuspid
incompetence,incompetence, Budd-Chiari syn.Budd-Chiari syn. (occlusion of HV)(occlusion of HV)
49. Cong. hepatic fibrosis:Cong. hepatic fibrosis: hematemesis, normal LFTs,hematemesis, normal LFTs,
hepatomegaly. May have polycystic disease & otherhepatomegaly. May have polycystic disease & other
renal D. Etiology is unknownrenal D. Etiology is unknown
Hepato-portal sclerosis:Hepato-portal sclerosis: thickening of intrahepatic PVthickening of intrahepatic PV
obstructs BF: leads to collateral veins in porta hepatisobstructs BF: leads to collateral veins in porta hepatis
Suprahepatic obstructionSuprahepatic obstruction c/by a web in the IVC orc/by a web in the IVC or
Budd-Chiari syn. Extremely rare. CF may mimicBudd-Chiari syn. Extremely rare. CF may mimic
constrictive pericarditis. DD by echo-, venographyconstrictive pericarditis. DD by echo-, venography
50. CF of portal hypertensionCF of portal hypertension
may not always be specificmay not always be specific
Splenomegaly (hypersplenism: pancytopenia)Splenomegaly (hypersplenism: pancytopenia)
Caput medusaCaput medusa
Hematemesis, melena or PR bleedHematemesis, melena or PR bleed
AscitesAscites
Encephalopathy: poor liver function & diversion of bloodEncephalopathy: poor liver function & diversion of blood
away from liveraway from liver
52. Diagnosis:Diagnosis: by detecting CLD, encephalopathy, ascites,by detecting CLD, encephalopathy, ascites,
varices.varices. Investigations:Investigations: esophagoscopy, Ba-swallow,esophagoscopy, Ba-swallow,
USG, celiac axis angiogramUSG, celiac axis angiogram
PV Thrombosis:PV Thrombosis: Dx is difficultDx is difficult
may present within 5y age as hematemesis with onlymay present within 5y age as hematemesis with only
splenomegaly & low plateletsplenomegaly & low platelet
• H/of umbilical V cannulation & abdo. sepsis (40%), orH/of umbilical V cannulation & abdo. sepsis (40%), or
trauma/pancreatitis. PVT is mainly congenital. LFTs intrauma/pancreatitis. PVT is mainly congenital. LFTs in thesethese
are normal. USG may confirm PVT: collateral veinsare normal. USG may confirm PVT: collateral veins in thein the
porta hepatis replacing the PVporta hepatis replacing the PV
53. TreatmentTreatment
Esophageal variceal bleeding:Esophageal variceal bleeding:
By the time pt. reaches ERBy the time pt. reaches ER
- 1/31/3rdrd
– stopped bleeding– stopped bleeding
- 1/31/3rdrd
– still oozing– still oozing
- 1/31/3rdrd
– still bleeding heavily– still bleeding heavily
Initial measures: ICUInitial measures: ICU
- BT: up to 10 unitsBT: up to 10 units
- LFT: coagulation profileLFT: coagulation profile
- If <50,000, platelet transfusion- If <50,000, platelet transfusion
- Endoscopic evaluation & treatment- Endoscopic evaluation & treatment
54. • Encephalopathy: may need ventilatorEncephalopathy: may need ventilator
• Bronchial aspiration – a frequent complicationBronchial aspiration – a frequent complication
• If profuse bleed prohibits endoscopy:If profuse bleed prohibits endoscopy:
• Insert Sengstaken – Blakemore tube & tamponade;Insert Sengstaken – Blakemore tube & tamponade;
deflate after 12h to avoid pressure necrosisdeflate after 12h to avoid pressure necrosis
57. DrugsDrugs
• I/V Vasopressin. SE: Abdo. crampsI/V Vasopressin. SE: Abdo. cramps
• I/V Octreotide (Somatostatin analogue): EquallyI/V Octreotide (Somatostatin analogue): Equally
effective, safeeffective, safe
TIPSSTIPSS (transjugular intrahepatic portosystemic stent)(transjugular intrahepatic portosystemic stent)
revolutionized the Rx. Main Rx for drugrevolutionized the Rx. Main Rx for drug
resistant cases or in endoscopic Rx failureresistant cases or in endoscopic Rx failure
58. Surgical shuntSurgical shunt
(Replaced by TIPSS & liver transplant)(Replaced by TIPSS & liver transplant)
Surgical shunts:Surgical shunts:
• splenorenalsplenorenal
• portocavalportocaval
SE: encephalopathy (40%)SE: encephalopathy (40%)
No benefit for pts. who have no bleedingNo benefit for pts. who have no bleeding
59. C.I.C.I. of Liver transplantof Liver transplant
• Age >65 yAge >65 y
• H/o IHD, HF, Chr. Respiratory diseaseH/o IHD, HF, Chr. Respiratory disease
• Previous Surgical shunts (relative C.I.)Previous Surgical shunts (relative C.I.)
60. Rx of Ascites of CLDRx of Ascites of CLD
• Salt restrictionSalt restriction
• DiureticsDiuretics
• ParacentesisParacentesis
• Peritoneovenous shuntingPeritoneovenous shunting
• TIPSSTIPSS
• Liver transplantLiver transplant
61. MCQMCQ
Hepatitis A & E are common c/of CLDHepatitis A & E are common c/of CLD
Vaccines for HBV protects against HDVVaccines for HBV protects against HDV
Haemorrhoids in cirrhosis are due to HC failureHaemorrhoids in cirrhosis are due to HC failure
Palmer erythema is normal in pregnancyPalmer erythema is normal in pregnancy
Commonest c/of PHT is cirrhosisCommonest c/of PHT is cirrhosis
62. MCQMCQ
Commonest surgical c/of cirrhosis in children isCommonest surgical c/of cirrhosis in children is
biliary atresiabiliary atresia
Edema in CLD starts in legsEdema in CLD starts in legs
CLD may be idiopathicCLD may be idiopathic
Autoimmune LD have good prognosisAutoimmune LD have good prognosis
A1AT protects lungsA1AT protects lungs
Aflatoxin can cause cirrhosisAflatoxin can cause cirrhosis
Hepatic veins drain from the left, middle, & right parts of L. These are larger than the group of lower HV that can number from 6-20. All drain into IVC
None of the hepatic veins have valves
Sinusoid is a large capillary or open pore capillary. Fenestrated capillaries have BM that cover the pores, but open pore capillaries lack it. The open pores greatly increase permeability allowing proteins like albumin to readily go. They are found in liver, lymphoid tissue, endocrine organs, bone marrow & spleen. Sinusoids in terminal villi of placenta possess a continuous endoth. & complete BM
Perisinusoidal space (space of Disse) is bet. a hepatocyte & a sinusoid. It contains plasma.
Microvilli of hepatocytes extend into it, allowing plasma components from sinusoids to be absorbed. It may be obliterated in LD: less uptake by hepatocytes of nutrients & wastes like bilirubin. It also contains stellate cells (aka cells of Ito), which store fat or FSV including VA). A variety of insults can cause transforming into myofibroblasts: resulting in collagen: fibrosis: cirrhosis
Hepatopulmonary syn.: SoB & hypoxia c/by vasodilation in the lungs in liver d. Liver transplant is the only cure
CLD encompasses a wide spectrum of d. CF & lab. data in many of these are similar, & a definitive Dx often relies on specialized test & histopathology.
Chr. Hepatitis:. Most pediatricians, however, allow 3mo for an ac. liver insult to clear before undertaking specialized lab. tests & invasive studies
Reye syn: rare; can affect blood, L, & brain after recent viral inf. It always follows another illness. It mostly affects children & teens. It can develop quickly & without warning. It is most common during flu season
NV, listlessness, irritability, combativeness, confusion, delirium, fit, coma & death. Quick Dx & Rx are critical. Rx focuses on preventing brain damage. No cure. The cause is unknown. Aspirin increases the risk: use other pain relievers
Hereditary LD are rare metabolic & genetic defects that typically cause early CLD. Most are due to a defect of an enzyme/transport protein that alters a metabolic pathway & mainly affecting L. Molecular analysis permits early & specific Dx for most d & biopsy not needed. There is difference in penetrance, age, & outcome
CF & lab are frequently overlapping, thus rendering a DD difficult. For some d, prenatal Dx is also available.
Specific Rx are available for several d. & their effectiveness is strongly related to the precocity of Dx. A growing number of children with such d now survive well into adulthood. On the other hand, L transplant now offers a long-term survival.
Alpha-1 Antitrypsin Deficiency
AR (codominant) due to mutations of gene that encodes the serine (imp in meta: participates in the biosynthesis of purines & pyrimidines. It is the precursor to several amino a), protease inhibitor; mainly made by L, inhibits proinflam proteases like neutrophil elastase, thus, protecting lung from proteolytic damage. Incidence: 1/2k–5k. AATD appears with COPD, emphysema, & bronchiectasis usually between 4-5D. The L involvement is widely heterogeneous according to age at onset (1st year life to 6D) & clinical severity that ranges from CH & cirrhosis to ALF. AAT polymers accumulates in hepatocytes; progression is slow, even if few cases develop early cirrhosis. HCC has a v high incidence among AATD. The replacement Rx has no effect as L damage is due to the accumulation of the AAT mutant polymers & not to the lack of circulating AAT. All infants with prolonged jaundice or nonspecific s/of LD should be tested for AATD. Dx: serum AAT f/by qualitative determination of AAT alleles by isoelectric focusing (IEF), finally, genotyping. S. AAT must be done in absence of ac inflam. as it is an AP reactant. AAT levels are not measured if S. CRP are increased. The IEF analysis reveals the alleles of each subject. The M alleles (M1 to M6) are the most common & are considered “wild type alleles.” Most pts. with L or lung involvement are homozygous for the Z or the S or compound heterozygous for the 2 alleles. In them S. AAT levels are reduced by 40–60%. Heterozygous individuals (MZ or MS) rarely develop CF. However, the IEF analysis may provide false negative results. Also for this reason, molecular analysis is indicated. In the SERPINA1 disease gene, &gt;120 allelic variants have been identified so far; thus molecular analysis must be performed by gene sequencing. Gene variants are classified according to their effect on S. A1AT. Pts must be counseled before molecular analysis, & when severe mutations are identified the consanguineous should be counseled in turn & analyzed to reveal asymptomatic carriers.
Cystic Fibrosis
CF is the most frequent lethal AR d among Caucasians (incidence: 1/2,500). CF is a systemic d with mainly pancreatic insuf. in &gt;90% & pulmonary d due to inflam. & opportunistic colonization that gradually causes respiratory insufficiency. 20% experience meconium ileus. LD (30%) appears mainly in the first decade of life, but it is still obscure why only some develop LD. In fact, LD depends on the altered activity of CF transmembrane regulator (CFTR) chloride channel on the apical membrane of cholangiocytes. It causes an altered bile flow f/by a cholangiocyte-induced inflammatory response with proliferation of stellate cells, which gives rise to cholangitis & progressive periportal fibrosis. LD is slowly progressive, but in 10% it may rapidly evolve to multilobular biliary cirrhosis & PHT. The possibility to predict LD would be useful given the efficacy of ursodeoxycholic acid in the early stages, but its pathogenesis is poorly known. The scarce correlation between the CFTR genotype & liver expression in CF is well known, as it is the discordant severity of LD in CF sib pairs. L expression in CF is influenced by modifier genes like mannose-binding lectin & AAT, but such genes modulate the risk for liver disease only in a small percentage of CF patients.
The gold standard for CF Dx is the sweat test (sweat chloride levels after pilocarpine stimulation) f/by molecular analysis. Sweat test requires a specific skill & the knowledge of all conditions that may cause false positives, while the rate of false negative results is very low. However, CF Dx or exclusion must be based on two concordant sweat tests. The indications to sweat test include a large variety of clinical conditions.
The search of CFTR mutations is one of the most diffuse molecular analyses worldwide, because it is used to confirm CF Dx & prenatal [20] or preimplantation [21] diagnosis. About 2000 mutations have been identified in the CFTR gene so far (http://www.genet.sickkids.on.ca/). Guidelines suggest a two-step molecular analysis. In the first step a panel of the most frequent mutations is analyzed, including the mutations peculiar to the geographic area of each patient [22], & commercial kits are used [16, 23]. The first step identifies about 80% alleles from CF patients; the analysis of mutations peculiar to specific ethnic or geographic groups may increase the detection rate [24], & the scanning of CFTR coding regions reveals mutations in up to 90% alleles [25]. Large gene rearrangements are present in about 2-3% of CF alleles [16]. Finally, pathogenic mutations in noncoding region of the CFTR gene have been described [26, 27], but they are not analyzed for routine purposes. The detection rate of molecular analysis is lower in CFTR-RD [28]. No mutations are specifically associated with liver disease [29].
The Dx of liver disease in CF patients is difficult, because neither laboratory nor imaging has a great specificity. Liver biopsy contributes to the aim, but the patchy distribution of liver alterations in CF patients reduces its sensitivity
AIH: body’s own immune sys attacks L. It is chr, lasts many y. If untreated, it can lead to cirrhosis & LF.
2 forms: Type 1/classic, is more common. It mostly affects young F & is often a/with other AID. Type 2 generally affects F 2-14y. We don’t know the cause, although heredity & prior inf. may play a role. The trigger may be a virus, which may have happened a long time, even years ago.
Often, SS are minor. Most common: fatigue, abdo discomfort, aching joints, itching, jaundice, HM, nausea & spider angiomas. Others: dark urine, loss of appetite, pale stools & absence of menstruation. More severe complications are ascites & confusion. In 10%-20%, AIH may present with symptoms like an acute hepatitis.
Dx
AH often occurs suddenly. Initially, you may feel like you have a mild case of the flu. Blood tests & a liver biopsy.
Rx
Goal: suppressing the immune sys. with prednisone, often a second drug, azathioprine (Imuran) is also used. Rx starts with a HD prednisone. When improve, the dosage is lowered & azathioprine may be added. In most cases, AH can be controlled but not cured; most patients need to stay on the medicine for years, & sometimes for life. Unfortunately, long-term steroid can cause serious SE: DM, osteoporosis, HTN, glaucoma, wt gain & decreased resistance.
Who is at risk for AH?
70% AH women, 15 & 40. Many with it also have other AID (T1DM, thyroiditis, ulcerative colitis, vitiligo, or Sjogren’s
SS: Children & young people vary greatly, ranging: outwardly well & active to acutely ill & SS of liver failure.
Dx.: AIH can be easily confused with other illnesses. SS are v similar to VH. Rx.: mainly immunosuppressive. In some cases the malfunction eventually stops & Rx can be stopped. Rx length varies but it usually needs to be continued for a long time, often many years, with medication doses decreased over time in order to avoid SE.
Hereditary Hemochromatosis
HH is AR: Fe overload causing L cirrhosis, CM, DM, arthritis, & skin pigmentation that appear during the 3rd – 4th D. Incidence is 1/250. A myriad of d cause 2y H. In 2y H Fe overload involves macrophages; in HH iron mainly accumulates in hepatocytes, causing CLD, HCC. The pathogenesis of L damage in HH is mainly due to the iron-induced lipid peroxidation that occurs in hepatocytes & causes HC injury or death. Kupffer cells become activated & produce cytokines, which stimulate hepatic stellate cells to synthesize collagen, thereby leading to cirrhosis. SS depend on the phase of the d. When HH is Dx by occasional lab evaluation, most patients are still asymptomatic; if the Dx is performed for symptoms, HH may appear with cirrhosis, bronze-colored skin, DM (and other endocrine diseases), joint inflam, heart disease, arthralgia, & hepatomegaly.
The Dx is based on enhanced serum ferritin that correlates with the increased iron content of liver & the high transferrin saturation. Unsaturated iron-binding capacity has been proposed as an alternative to transferrin saturation, but it has a higher biological variability. Molecular analysis in HFE gene with different protocols would confirm HH but surprisingly it has a lower diagnostic sensitivity because the mutations are different in each geographic area. Homozygous patients for p.Cys282Tyr have a higher risk for iron overload.
Liver biopsy is performed in suspected patients with negative molecular analysis & ambiguous laboratory results; in addition, it may be used to assess the degree of liver fibrosis & cirrhosis & the degree of iron liver overload [3, 48]. Laboratory has a role also in the monitoring of patients through biochemical markers of (i) liver fibrosis [49]; (ii) liver protidosynthesis [50]; & (iii) hepatocarcinoma in patients with cirrhosis
Morbidity is mainly due to Fe pooling in endo. organs (especially pancreas, gonads, pituitary), liver, & heart.
African Fe overload occurs most often in sub-Sahara among people who eat an iron-rich fermented drink. A genetic component contributes here, but no gene has yet been identified
Cholangiocytes are epithelial cells lining the intra- & extrahepatic bile ducts. Main function is modification of bile, regulated by hormones, peptides, nucleotides, NT, & other molecules
Sclerosing cholangitis: v similar to AIH, only DD is that the immune sys attacks not only L. cells, but also bile ducts inside and/or outside L.
SS: Similar to AIH, but colitis & diarrhea are more common. A major symptom may be pruritus.
Dx. made with PE, blood tests, biopsy & a special x-ray under GA.
Rx.: immunosuppression medication, alongside medicine to improve bile flow. If colitis is present, this will be treated with special medicines
Toxic Hepatitis (TH) is an inflam. of L. c/by chemicals. Many chemicals are toxic: drugs, industrial solvents & pollutants. Virtually every drug has at one time or another been indicated as a toxin. Toxins can occasionally cause CLD & even cirrhosis if not stopped.
Do all toxins affect the L. in the same manner?
2 groups:
1. Predictable, known to cause TH & L. damage with sufficient exposure: cleaning solvents, CCl4 & acetaminophen.
2. Unpredictable, damage L. in a v. small proportion of individuals exposed to. Unpredictable injury produced by most drugs is v poorly understood but recent data suggest that a toxic response to a drug probably depends on the kind of enzyme a person inherits to metabolize the drug.
Why is the liver susceptible to chemicals?
L. is susceptible as it plays a fundamental role in detoxication. L. has the unique job of processing almost all chemicals & drugs that enter blood & removing the chemicals that are difficult for the kidneys. L. turns these chemicals into products that can be eliminated from the body through bile or urine. But, during this chemical process in the L, unstable highly toxic bi-products are sometimes produced: can attack & injure L. Alcohol likely enhances this especially for acetaminophen.
SS: can resemble any form ac./chr. LD: viral hepatitis or bile-duct obs. NV, F, jaundice as well as abnormal LFT & biopsy are often identical to VH. On the other hand, symptoms like F, AP & jaundice can mimic other L conditions, like stones blocking the bile ducts.
How is DX?
No clear test to prove. Dx is made based on a thorough assessment. First, the doctor must pay close attention to all drugs used (prescribed or OTC ones including vitamins & herbal remedies), as well as the environmental & occupational exposures to chemicals of each individual with LD. Dr must also consider the time of exposure. Some forms of chemical liver injury will occur within days to weeks; but, sometimes it takes many months of regular ingestion of a drug before liver injury becomes apparent.
Vitamin deficiencies & toxicities may be considered when your Dr is investigating the possibility of TH. Please consult your doctor about the need to monitor your overall vitamin status if you are taking an OTC prescribed vitamin supplement.
How treated?
The drug(s) should be immediately discontinued & further exposure to the offending chemical prevented. Removal of the offending chemical or drug leads to rapid improvement often within days but sometimes several months may elapse before improvement is noted, even if CLD has already developed. No other specific therapy is needed
Type I Tyrosinemia
Type I tyrosinemia (TYRSN1, OMIM 276700) is an autosomal recessive disease with an incidence of about 1 : 100,000. It is the most severe form of genetic tyrosinemia & is the only one that causes a severe liver involvement [52, 53].
Type I tyrosinemia is classified in two forms: the first, more frequent, appears with a severe liver expression in the first months of life that may progress to ascites, jaundice, & gastrointestinal bleeding; the second includes cases with acute liver failure at about one year & a chronic evolution with renal-tubular dysfunction [54]. Untreated patients die within the first decade of liver failure or of early hepatocarcinoma. The use of nitisinone & a tyrosine-restricted diet quite completely revert symptoms [55]. Type I tyrosinemia is due to the altered activity of fumarylacetoacetate hydrolase, which causes the elevation of plasma & urine succinylacetone (diagnostic golden standard) & high plasma concentration of tyrosine, methionine, & phenylalanine. Sequence analysis in FAH gene may be performed for molecular Dx including prenatal [56].
7. Glycogen Storage Disease Type IV
Glycogen storage disease (GSD, OMIM 232500) type IV is an autosomal recessive disease with an incidence of about 1 : 600,000. It is due to mutations in the gene encoding the glycogen branching enzyme (GBE1) that catalyzes the alpha 1,6 bond of the first glucose in the side chains of glycogen [57]. The altered glycogen branching reduces its solubility, thus impairing the osmotic pressure within the hepatocyte [58]. Several clinical forms of GSD have been described including (i) a neuromuscular form that appears in the perinatal age or in childhood; most of these cases have an early fatal evolution & are typically due to two null mutations; (ii) a hepatic form that may have a progressive or a nonprogressive evolution; patients are usually compound heterozygous for a severe (null) & a mild (missense) mutation; & (iii) the polyglucosan body disease that appears in adulthood with upper & lower motor neuron involvement & executive dysfunction [59]. The hepatic form is the most frequent phenotype. In the progressive subtype, the clinical expression appears in the first months of life with failure to thrive & hepatomegaly that evolves (in a variable time) to cirrhosis with portal hypertension requiring liver transplantation [60]. In the rare nonprogressive subtype the patients show a variable combination of liver disease (that usually does not evolve to cirrhosis), myopathy, & hypotonia. The Dx of GSD is based on biochemical findings from a liver biopsy that reveals an abnormal glycogen content, & on the evidence of enzymatic deficiency in the liver, muscle, or fibroblasts. Now it is based on molecular analysis, that is, the sequence of the GBE1 gene followed by the search of large gene deletions [61]. In about 10% of patients a negative molecular analysis despite clinical symptoms suggests to perform the enzyme assay on cultured fibroblasts [62]. Prenatal Dx is possible if the disease-causing mutations in the family proband are known [63].
8. The Urea Cycle
The urea cycle includes a series of reactions that convert nitrogen from ammonia & aspartate into urea [64]. Urea cycle disorders (UCDs) are a group of inborn errors that typically cause a life-threatening hyperammonemia. Among these, argininosuccinate lyase (ASL) & citrin deficiency are usually associated with severe liver disease.
8.1. Argininosuccinate Lyase Deficiency
Argininosuccinate lyase deficiency (ASLD, OMIM 207900) is the second most common UCD with an incidence of about 1 : 70,000 & is due to the deficiency of the enzyme that cleaves argininosuccinic acid into arginine & fumarate. The disease includes a severe neonatal onset form & a late onset form: the first appears with hyperammonemia within the first few days of life with vomiting, lethargy, hypothermia, & poor feeding. On the contrary, the late onset form ranges from episodic hyperammonemia triggered by acute infections or stress to cognitive impairment, behavioral abnormalities, and/or learning disabilities in the absence of episodes of hyperammonemia [65]. Symptoms of ASL deficiency are unrelated to the severity or duration of hyperammonemic episodes & include neurocognitive deficiencies with attention deficit hyperactivity disorder & developmental disability [66]. Liver disease ranges from hepatomegaly to severe liver fibrosis & cirrhosis [67]. Systemic hypertension [68] & electrolyte imbalance may be present.
Laboratory Dx of ASL deficiency is based on enhanced levels of citrulline & increased argininosuccinic acid in plasma and/or in urine [64]. A newborn screening for ASLD is available in all US citrulline testing. ASLD is due to heterogeneous mutations in the ASL gene [69] & sequence analysis detects mutations in about 90% of patients. ASL enzyme activity can be measured in cell homogenates from liver biopsy or from skin fibroblasts or erythrocytes [70]. Prenatal Dx is available [71].
8.2. Citrin Deficiency
Citrin deficiency is an autosomal recessive disorder & may appear with two phenotypes: neonatal intrahepatic cholestasis caused by citrin deficiency (NICCD, OMIM 605814) & the adult form called citrullinemia type II (CTLN2, OMIM 603471). A form that appears with dyslipidemia (FTTDCD) was described more recently [72]. Typically, citrin deficiency is characterized by food preference (protein-rich/lipid-rich foods) or aversion (carbohydrate-rich foods).
Neonatal intrahepatic cholestasis has an incidence of about 1 : 19,000 & appears with aminoacidemias, galactosemia, hypoproteinemia, cholestasis, & variable hepatic dysfunction [73]. Although such symptoms self-resolve by the first year in most cases, some infants die of infection or of liver cirrhosis [74, 75]. Citrullinemia type II has an incidence of about 1 : 100,000 & appears later between second & fourth decade with recurrent hyperammonemia with neuropsychiatric symptoms; death can be due to brain edema [76]. Symptoms are frequently triggered by alcohol & sugar intake, medication, and/or surgery. Affected patients may or may not have a prior history of NICCD or FTTDCD.
The Dx of citrin deficiency is based on clinical & biochemical findings that include enhanced plasma ammonia, citrulline & arginine, & threonine : serine ratio. In neonatal intrahepatic cholestasis plasma threonine, methionine, & tyrosine are elevated as bilirubin, bile acids, & alpha-fetoprotein [73]. Plasma levels of galactose, methionine, and/or phenylalanine are elevated in newborn screening blood spots in about 40% of children.
Citrin deficiency is caused by mutations in SLC25A13 gene & is characterized by a liver-specific decrease in argininosuccinate synthetase (ASS) [77, 78]. The liver reduction of ASS in CTLN2 patients is secondary to citrin deficiency [79], although its cause still remains to be clarified.
9. Cholesteryl Ester Storage Disease
Cholesterol ester storage disease (CESD, OMIM 278000) is an autosomal recessive disorder of lysosomal storage with an incidence ranging between 1 in 40,000 in the Germanic population & 1 : 300,000–1 : 500,000 in the general Caucasian population [80]. It is due to deficiency of lysosomal acid lipase (LAL), which catalyzes the intracellular hydrolysis of triacylglycerols & cholesteryl esters. Its deficiency causes a progressive accumulation of cholesteryl esters (CE), & to a lesser extent, triglycerides, mainly in lysosomal hepatocytes, adrenal glands, & macrophages [81].
Usually patients develop hepatomegaly that leads to fibrosis & micronodular cirrhosis [82] within the first ten years of life. CESD can appear as two forms: Wolman disease, that is, the severe pediatric form, fatal within 1-2 years of life, & the later onset CESD, a more benign disease, associated with some residual LAL activity [80].
Wolman disease is a rare, neonatal onset, lethal disorder that appears in the first months of life with vomiting & diarrhea & severe hepatosplenomegaly. About 50% of patients show adrenal calcifications [83]. In contrast, CESD is often undiagnosed, has a later onset, & may appear in infancy or childhood, depending on the residual levels of LAL activity [83, 84]. CESD should be suspected in children with hepatomegaly & splenomegaly with elevated transaminases, high cholesterol, & low HDL [85].
Liver biopsy helps the Dx even if false negatives were reported [86, 87]. To confirm the Dx of CESD, LAL activity & molecular analysis of the acid lipase gene (LIPA) are available.
To date, over 40 LIPA mutations have been identified in patients with CESD [88]. No genotype-phenotype correlation has been established. Prenatal Dx is also available [80].
10. Alström Syndrome
Alström syndrome (ALMS, OMIM 203800) is a rare autosomal recessive disease with an incidence of 1 : 1,000,000. It appears in infancy with a wide variability in age at onset & severity, & typically leads to organ failure causing a reduced life expectancy, rarely exceeding 50 years. Alström syndrome appears with cone-rod dystrophy, obesity, progressive sensorineural hearing impairment, dilated or restrictive cardiomyopathy, the insulin resistance syndrome, & multiple organ failure [89, 90]. Therapy is complex due to the combination of multiple endocrine disorders, sensorineural deficits, cardiac, renal, & hepatic abnormalities [91]. Fibrosis develops in multiple organs [89]. Liver expression ranges from steatohepatitis to portal hypertension & cirrhosis & can cause hepatic encephalopathy & life-threatening esophageal varices. The Dx is based on clinical features [92], & genetic testing is used when major (vision) & minor criteria do not permit a clinical diagnosis. Molecular testing of the disease gene, ALMS1, detects mutations in up to 80% of patients of northern European descent, & in about 40% of cases worldwide [93, 94]. Carrier & prenatal Dx can be offered if the disease-causing mutations have been identified in a family proband [95].
11. Congenital Hepatic Fibrosis
Congenital hepatic fibrosis (CHF) is an autosomal recessive disease characterized by periportal fibrosis & irregularly shaped proliferating bile ducts. The incidence is about 1 : 20,000 [96].
In most patients, the first symptom is portal hypertension (PH) with gastrointestinal bleeding [97]. Pulmonary hypertension & pulmonary vascular shunts are typical complications of PH. Frequently CHF is associated with ciliopathies & renal disease, the so-called hepatorenal fibrocystic disease [98].
Congenital hepatic fibrosis involves various organs (e.g. renal, central nervous system, etc.), but most cases are referred for liver diseases. Four clinical forms have been described [99]: (i) portal hypertension (most common & more severe in the presence of portal vein abnormality); (ii) cholangitis with cholestasis & recurrent cholangitis; (iii) both portal hypertension & cholangitic symptoms; & (iv) latency that appears at a late age with hard hepatomegaly.
Symptoms of CHF are nonspecific, making the Dx difficult. The late onset & the clinical evolution suggest that CHF is a dynamic & progressive condition [100, 101].
The Dx of CHF can be made by liver biopsy that shows a progressive hepatic fibrosis with nodular formation. Such findings may be mistaken for cirrhosis, but, unlike cirrhosis, hepatic lobules are usually normal with normal hepatocyte morphology, particularly in the early phases [100, 102]. The gene/s causing CHF is/are unknown.
12. Hereditary Fructose Intolerance
Hereditary fructose intolerance (HFI, OMIM 229600) is an autosomal recessive disease (incidence 1 : 20,000) due to the deficiency of fructose 1-phosphate aldolase (aldolase B) involved in the metabolism of fructose-1-phosphate (exogenous fructose) into dihydroxyacetone phosphate & D-glyceraldehyde [103].
Onset of symptoms can occur at any age. The persistent intake of fructose, sucrose, or sorbitol in childhood leads to chronic toxicity [104, 105] that causes irreversible damage to the liver (early cirrhosis) & kidney [105]. The strict dietary exclusion leads to normal growth & longevity, but it is difficult to achieve [106].
The early Dx of HFI is crucial to start the strict exclusion diet thus avoiding tissue injury & growthretardation. 31P nuclear magnetic resonance spectroscopy has been used successfully [107]. The fructose tolerance test (breath test) has a high diagnostic sensitivity [106]. Molecular Dx of HFI consists in direct sequencing of the gene encoding aldolase B (ALDOB). About 45 different mutations are known so far (http://www.bu.edu/aldolase/HFI/hfidb/hfidb.html) & it is now the diagnostic gold standard [108–111].
13. Progressive Familial Intrahepatic Cholestasis Type 3
Progressive familial intrahepatic cholestasis (PFIC) refers to a heterogeneous group of inherited cholestatic disorders that impair bile formation & appear with cholestasis of hepatocellular origin. Three types of PFIC are known. Progressive familial intrahepatic cholestasis type 3 (PFIC3, OMIM 602347) is an autosomal recessive disorder with a prevalence estimated of about 1 : 100,000 [112].
PFIC3 may appear in infancy, in childhood, or during young adulthood. Main symptoms include gastrointestinal bleeding due to portal hypertension, early cirrhosis, & moderate pruritus [113]. The phenotypic expression of PFIC3 ranges from neonatal cholestasis to cirrhosis in young adults [114]. The evolution of the disease is characterized by chronic icteric or anicteric cholestasis, portal hypertension, & liver failure. In about 50% of the patients, liver transplantation is required at a mean age of 7.5 years [115]. Laboratory findings show high serum gamma-glutamyl transferase (γ-GT) activity (while other two types of PFIC have normal serum γ-GT activity), normal cholesterol levels, & moderately enhanced bile acid concentrations. Liver histology shows portal fibrosis & true ductular proliferation with mixed inflammatory infiltrate and, in advanced phases, signs of biliary cirrhosis. Interlobular bile ducts are seen in most portal tracts & there is neither periductal fibrosis nor biliary epithelium injury [113].
PFIC3 is caused by mutations in the ABCB4 gene encoding the multidrug resistance protein 3 (MDR3) protein. This gene is expressed in the canalicular membrane of the hepatocyte & is responsible for phospholipid transport into bile [116]. Reduced or absent activity of the MDR3 transporter causes impaired phospholipid secretion, previously identified as “low phospholipid syndrome” [117]. The Dx of PFIC3 is confirmed by molecular genetic analysis of the ABCB4 gene by sequencing of exons & their splice junctions (http://evs.gs.washington.edu/EVS/) [118]. There are several mutations in ABCB4 that have a clear effect on the protein & a genotype-phenotype correlation is observed [119–122]. Prenatal Dx is available.
14. Conclusions & Future Prospects
A chronic liver involvement that can predispose to cirrhosis may be observed in a number of genetic diseases with a different penetrance, age at onset, & outcome. Clinical symptoms & laboratory data are frequently overlapping, thus rendering a differential Dx difficult. In the present review we critically discussed the genetic entities responsible for early liver cirrhosis, describing for each disease the laboratory Dx & molecular genetics.
In fact, the recent advances made in understanding the genetics & pathophysiology of inherited liver diseases can contribute to the identification of novel strategies for the Dx of these conditions. Molecular analysis changed the diagnostic approach in these genetic diseases & led to reduction of invasive & expensive procedures & diagnostic errors.
Disease-genes identification is a step forward in the diagnostic approach to a patient in whom early liver cirrhosisis strongly suspected. However, we have to point out some critical points: (i) molecular analysis would be based on scanning procedures using the gene sequencing; (ii) the negative result of molecular analysis does not exclude the disease, because mutations may involve noncoding, regulatory areas; (iii) some liver diseases are very rare; it is necessary that laboratories also offer molecular Dx for such diseases.
However, the availability of new technologies as high throughput sequencing at reasonable costs could help to perform extensive analyses, especially in cases in which more disease genes are involved. No clear genotype-phenotype correlation has been established in most cases, so proteomic & functional studies on the effect of the mutations may guide physicians in the prescription of treatment procedures. In some cases, molecular analysis has been used for prenatal Dx to help high risk couples to better plan their reproductive options.
However, given the increased number of genetic liver diseases, the complexity of genotype-phenotype correlations & the need of multidisciplinary counseling to the families, a strict collaboration between physicians & molecular laboratories is mandatory in this field.
Hemochromatosis is a disease in which deposits of iron collect in the liver & other organs. The primary form of this disease is the most common inherited disease in the U.S. When one family member has this disorder, siblings, parents & children are also at risk.
A secondary form of hemochromatosis is not genetic & is caused by other diseases, such as thalassemia (a genetic blood disorder that causes anemia) & severe alcoholism.
Hemochromatosis affects men five times more often than it does women, especially those of Western European descent. Because women lose blood through menstruation, women are unlikely to show signs of iron overload until 10 or more years after menopause.
What Are the Symptoms of Hemochromatosis?
The symptoms of hemochromatosis include:
Liver disease
Joint pain
Fatigue
Unexplained weight loss
A darkening of the skin frequently referred to as &quot;bronzing&quot;
Abdominal pain
Loss of sexual desire
People with hemochromatosis may also have signs of diabetes & heart disease & may also develop liver cancer, cirrhosis, testicular atrophy (wasting away), & chronic abdominal pain.
How Is Hemochromatosis Diagnosed & Treated?
Whenever hemochromatosis is suspected, a blood test to look for excess iron in the blood & a liver biopsy are performed.
The goal of treatment is to remove excess iron from the body, as well as reduce any symptoms or complications that have resulted from the disease.
Excess iron is removed from the body in a procedure called phlebotomy. During the procedure, one-half liter of blood are removed from the body each week for a period of two to three years or until the iron build up has been reduced.
After this initial treatment, phlebotomies are needed less frequently. The frequency varies based on individual circumstances.
To help keep iron levels down, people with hemochromatosis need to avoid iron, most commonly found in vitamin preparations. If you have hemochromatosis, your doctor or dietitian will put together a diet that is right for you. Alcohol avoidance is usually recommended.
If hemochromatosis has caused cirrhosis, the risk of liver cancer becomes higher. As a result, screening for cancer should be performed on a regular basis.
Alpha-1 Anti-Trypsin Deficiency
In this inherited liver disease an important liver protein known as alpha-1 anti- trypsin, is either lacking or exists in lower than normal levels in the blood. People with alpha-1 anti-trypsin deficiency are able to produce this protein; however, the disease prevents it from entering the bloodstream & it instead accumulates in the liver.
Alpha-1 anti-trypsin protein protects the lungs from damage due to naturally occurring enzymes. When the protein is too low or non-existent, the lungs can become damaged, leading to difficulty breathing and, in 75% of the people with the condition, emphysema. People with this disease are also at risk of developing cirrhosis .
What Are the Symptoms of Alpha-1 Anti-Trypsin Deficiency?
The first signs of alpha-1 anti-trypsin deficiency will usually be symptoms of its effects on the lungs, including shortness of breath or wheezing. Unexplained weight loss & a barrel-shaped chest, which is commonly associated with the presence of liver disease, are also signs of the condition. As the disease progresses, symptoms typical of emphysema or cirrhosis may appear, & include:
Fatigue
Chronic cough
Swelling of the ankles & feet
Jaundice
Nausea
Vomiting
How Is Alpha-1 Anti-Trypsin Deficiency Diagnosed & Treated?
Physical signs, such as a barrel-shaped chest & respiratory problems, may lead your doctor to suspect alpha-1 anti-trypsin deficiency. A blood test that tests specifically for the alpha-1 anti-trypsin protein will help confirm the diagnosis.
There is no established treatment for alpha-1 anti-trypsin deficiency but it can be treated by replacing the protein in the bloodstream. However, experts are not clear on how effective this technique is & who should receive it. Other approaches to treating alpha-1 anti-trypsin deficiency involve treating the complications such as emphysema & cirrhosis. This includes antibiotics to combat respiratory infections, inhaled medication to make breathing easier, & diuretics & other measures to reduce any fluid build up in the abdomen.
Personal behavior, such as avoiding alcohol, quitting smoking & eating a healthy diet, can also help keep symptoms & complications from becoming severe. Your doctor or dietitian can recommend a diet that is right for you.
Because the disease affects the lungs, people with the condition are more prone to respiratory infections. Therefore both flu & pneumonia vaccinations are recommended to help prevent these infections. If you feel you are developing a cold or cough, contact your doctor so treatment can begin as soon as possible. Occasionally the lungs or liver deteriorates despite treatment. In such cases, liver transplantation may be advised.
What Is the Prognosis for People With Inherited Liver Diseases?
With proper treatment, hemochromatosis & alpha-1 anti-trypsin deficiency disease are usually not fatal. However, complications associated with the diseases can be. It is very important that people with inherited liver diseases do all they can to stay healthy
Hepatic facies: characterised by
Shrunken eyes, Hollowed temporal fossa, Pinched-up nose with malar prominences, Parched lips
Muddy complexion of skin, Shallow and dry face, Icteric tinge of conjunctiva
Stigmas of chr. decompensated LD: Altered sensorium, Inversion of sleep rhythm, Jaundice
Foetor hepaticus (sweetish, slightly faecal smell of breath similar to freshly opened corpse of mice due to methyl mercaptan derived from methionine)
Flapping tremor: Jerky irregular flexion-extension at wrist & MP joints; absent in coma. It is also seen in respiratory, renal failure, occasionally in hypoglycemia & barbiturate intoxication
Constructional apraxia, Ascites, edema, Hyperreflexia, extensor plantar
Muehrcke nails are paired horizontal white bands separated by normal color; may be due to hypoalbuminemia. They are not specific as seen in other low albumin
Terry nails: Nail bed is white with a ground-glass opacity; contains a pink distal band 0.5-3.0 mm. The lunula may be absent; a/with several d & advancing age (common): T2D, congestive HF, CRF. The cause is unclear, but may be due to changes in microvasculature
Xanthomatosis: fatty deposits occur in various parts of body. These are yellowish firm nodules in skin. Xanthomas are in themselves a harmless growth of tissue
Palmar erythema (liver palms) is reddening of palm, usually over hypothenar eminence. It may also involve the thenar eminence& fingers. It can also be found on the soles (plantar erythema). It can be Primary/physiological& Secondary to various d. it is due to 1. hyperdynamic circulation, 2. Capillary dilatation in the palms, 3. Localized inflam., 4. High oestrogen
30% of pregnancy, 23% of cirrhosis, 60% of RA develop it.
Primary PE: Heredity. Pregnancy, Idiopathic
Secondary: Hereditary LD like Wilson&apos;s & haemochromatosis, RA: favorable prognosis, SLE, Thyrotoxicosis, DM, Sarcoidosis, Gestational syphilis, HTLV-1-associated myelopathy. Neoplasm (as a paraneoplastic d), particularly primary or metastatic brain neoplasms, ovarian carcinoma, Smoking, Chr Hg poisoning, Polycythemia
Drugs: amiodarone, gemfibrozil, cholestyramine, topiramate, salbutamol
Investigations: depend on the underlying condition(s) suggested by the overall clinical picture. Idiopathic palmar erythema should be a Dx of exclusion.
Management: No specific Rx., underlying d. If a drug is responsible, this should be discontinued if possible
Human T-lymphotropic virus or human T-cell lymphotropic virus (HTLV) family of viruses are a group of retroviruses that cause a type of cancer called adult T-cell leukemia/lymphoma& a demyelinating d called HTLV-I associated myelopathy/tropical spastic paraparesis (HAM/TSP). The HTLVs belong to a larger group of primate T-lymphotropic viruses (PTLVs). Members of this family that infect humans are called HTLVs,& the ones that infect Old World monkeys are called Simian T-lymphotropic viruses (STLVs). 4 types of HTLVs: HTLV-I, HTLV-II, HTLV-III,& HTLV-IV)& four types of STLVs (STLV-I, STLV-II, STLV-III,& STLV-V) have been identified. HTLV types HTLV-1& HTLV-2 viruses are the first retroviruses which were discovered. Both belong to the oncovirus subfamily of retroviruses& can transform human lymphocytes so that they are self-sustaining in vitro. The HTLVs are believed to originate from intraspecies transmission of STLVs. The original name for HIV, the virus that causes AIDS, was HTLV-III. The HTLV-1 genome is diploid, composed of two copies of a single-stranded RNA virus whose genome is copied into a double-stranded DNA form that integrates into the host cell genome, at which point the virus is referred to as a provirus. A closely related virus is bovine leukemia virus BLV.
Spider naevi is small angiomata which appear on the surface of the skin. Central, ascending vessel resembling the body of a spider, with the finer radiating vessels looking like the legs of a spider. Spider naevi may be an indication of underlying disease, particularly alcoholic cirrhosis of the liver, but can also occur in healthy individuals, especially pregnant women, or in response to pharmacological agents. They are a feature of disturbed circulating sex hormone activity. This may cause an elevated estradiol/free testosterone ratio. Alternatively, particularly in alcoholic cirrhosis, they may result from serum vascular growth factors in combination with alcohol, leading to neovascularisation, especially in younger patients in whom they are more common.[2] Substance P may also be involved in patients with non-alcoholic cirrhosis.[3]
Epidemiology: 15-20% of healthy individuals will have one or more spider naevi.
Multiple spider naevi are more indicative of underlying disease.
They are common in children, particularly of school age.[4] They show an equal sex incidence.
Spider naevi may also develop in pregnancy, or when taking combined hormonal contraception.
Just one, or a few spiders, are more common in women.
There is probably no racial difference in prevalence but they are less obvious on darker skin.
Presentation
Spider naevi are usually asymptomatic. Presentation is either due to possible concern about the aetiology or, especially if they are on the face, because of cosmetic effect. Rarely, they may bleed with minor trauma.
They are small lesions with a number of tiny blood vessels radiating from them to resemble the legs of a spider. The centre is about 1 mm in diameter& the whole lesion about 5-10 mm across. Firm pressure with a glass slide or something small, such as the end of an opened paper clip, will cause it to blanch& when the pressure is released it will rapidly refill from the central arteriole.
Lesions most frequently occur on the face, below the eyes,& over the cheekbones. Other common sites include the hands, forearms& ears. Spider naevi may occur on the trunk, or on the scalp, neck, arms& hands. Almost all spider naevi occur on the upper part of the body& only 1% below the umbilicus. Traditional teaching is that they are restricted to areas drained by the superior vena cava but this is disputed by William Bean, one of the great founders of hepatology.[5] Although healthy individuals may have one or more lesions, the presence of large numbers suggests underlying disease. Look for other stigmata of liver disease.
Ask about drugs, as these may cause liver damage. Ask about alcohol consumption.
Differential diagnosis
Spider naevi may be differentiated from other lesions with a similar appearance by the fact that they blanch with pressure, as described above,& refill again from the centre outwards.
Campbell de Morgan spots are bigger red spots without vessels radiating& they tend to occur in older people
Insect bites may have a central punctum& should soon resolve. They may itch.
Dilated small blood vessels are seen in the condition telangiectasia. Osler-Rendu-Weber syndrome is a condition in which multiple areas of telangiectasia occur.
Haemangioma is a larger red spot, often raised
Investigations
For most healthy young people with a single lesion, or just a few,& especially children, no investigation is required. Otherwise, assess liver function, including hepatitis markers. TFTs may also be indicated, as they can occur with thyrotoxicosis.
Associated conditions
Spider naevi may be associated with any condition that results in increased circulating levels of oestrogen, including: Pregnancy, Alcoholic cirrhosis, Hepatitic cirrhosis, Hepato-pulmonary syndrome
Management
Usually no treatment is required& many will fade spontaneously or resolve as the underlying condition improves. Spider naevi may be treated with laser therapy or electrocoagulation if desired for cosmetic reasons.[6]
Prognosis
Benign lesions tend to resolve spontaneously but may take a number of years to do so. If associated with pregnancy they tend to go about six or seven months after delivery. They will also resolve some time after stopping combined oral contraception. If associated with liver disease, they may resolve if the liver disease improves.
Epilogue
Although Erasmus Wilson made the classic description of spider naevi, it was William Bean who studied them extensively& who noted the association with cirrhosis, especially of the alcoholic kind. He will also be remembered for his poetry on the subject of alcoholic cirrhosis, spider naevi& palmar erythema& it is worthy of repetition:
An older Miss MuffettDecided to rough itAnd lived upon whisky& gin.Red hands& a spiderDeveloped outside her -Such are the wages of sin
A FibroScan is a test that can reveal any fibrosis or fatty deposits within the liver. It is a non-invasive, quick and simple test that works using ultrasound and gives an immediate result
BC syn is uncommon: thrombotic /nonthrombotic obs. of HV: hepatomegaly, ascites, & AP. Prognosis is poor if untreated, death in 3 mo-3 y. Following PS shunting 5-y survival 38-87%. 5-y survival following liver transplantation is 70%.
PE: Jaundice, ascites, HSM, ankle edema, stasis ulcerations, prominence of collateral veins. 1. Acute & sub-acute forms: rapid AP, ascites, hepatomegaly, jaundice, & renal failure.
2. Chr form: Most common: progressive ascites; no jaundice; 50% have renal impairment
Fulminant form: Uncommon: fulminant or subfulminant hepatic failure, ascites, tender hepatomegaly, jaundice,& renal failure.
Laboratory : ascitic fluid provides clues: high protein (&gt;2 g/dL); this may not be present in persons with the acute form of the disease
WBC count is usually less than 500/µL. The serum ascites–albumin is usually &lt;1.1 (except in the acute forms
Imaging : USG , CT, MRI, Venography
Biopsy: high-grade venous congestion& centrilobular liver cell atrophy, and, thrombi within the terminal hepatic venules
Rx: Anticoagulants Thrombolytics Diuretics Balloon angioplasty Localized thrombolysis, stent or TIPS
Variceal treatment Paracentesis Portal decompression Percutaneous transhepatic balloon angioplasty (PTBA)
Liver transplantation
Tamponade: blockage/closure (as of a wound/body cavity) by (or as if by) a tampon (especially to stop bleeding)
Octreotide (Sandostatin) is an octapeptide that mimics natural somatostatin pharmacologically, though it is a more potent inhibitor of GH, glucagon, & insulin than the natural hormone. Used for:
Treating severe diarrhea and flushing c/by certain cancers. It is also used to treat acromegaly. It works by reducing blood levels of a variety of hormones (GH) and chemical messengers (eg, gastrin, vasoactive intestinal peptide) that cause disease symptoms