viral hepatitis (1)??


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Viral hepatitis : 

Viral hepatitis

synopsis : 

synopsis Viral hepatitis is a group systemic infection affecting the liver predominantly caused by 5 kinds of viruses at least Viral hepatitis may be divided into 5 types according to etiology, that is hepatitis A, B, C, D and E Although the agents can be distinguished by its antigenic properties, the 5 kinds of viruses may produce clinical similar illness

Synopsis : 

Synopsis Clinical manifestations are characterized by anorexia, nausea, lassitude, enlarged liver and abnormal liver function, a part of cases may appear jaundice. Subclinical infection is common Hepatitis A and E shows acute hepatitis, hepatitis B, C and D predispose to a chronic hepatitis and is related to liver cirrhosis and hepatic cancer The course of acute hepatitis is about 2-4 months generally. Recently, 2 kinds of viruses named HGV and TTV are discovered and considered to relate to viral hepatitis

Etiology : 

Etiology Hepatitis A virus (HAV) HAV is one kind of picornavirus and used to be classified as enterovirus type72, but recently, it is considered to be classified as heparnavirus Hepatitis A virion is a naked spherical particle, diameter 27nm Consists of a genome of linear, single-stranded RNA, 7.5kb. The genome may be divided into 3 coding region: P1 region (encoding structural protein), P2 and P3 regions (encoding non-structure protein) During acute stage of infection, HAV can be found in blood and feces of infected human and primates Marmoset and chimpanzee are susceptible animals

Etiology : 

Etiology Hepatitis A virus (HAV) HAV can not cause cytopathy, replicate within cytoplasma of hepatocytes and via bill are discharged with feces 7 genetypes, 1, 2, 3, 7 types from humanbody Only one antigen-antibody system. Anti-HAV IgM is diagnostic evidence of recent infection, IgG is protective antibody. Resistance of HAV: 56°C, 30 min, usually temperature 1 week, dry feces at 25°C 30 days, fresh water, sea water ,shellfish or soil for several months. 70% alcohol at 25°C , 3 min, 100°C, 5 min and ultraviolet, 1 min

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Etiology : 

Etiology Hepatitis B virus (HBV) HBV is a kind of hepadnavirus Three particles in serum: spherical particles and tubular particles with a diameter of 20 nm, composed of HBsAg large particles with a diameter of 42 nm, named Dane particle. It consists of an outer protein shell (envelope, contain HBsAg) and an inner body ( core, contain HBcAg, HBeAg, HBV-DNA and DNAP )

Etiology : 

Etiology Hepatitis B virus (HBV) Hepatitis B virion genome is a small circular, partially double stranded DNA with 3200 nucleotides long. HBV DNA is asymmetry in length of two strands: minus strand (long strand, L) has full length. Four open reading frames (ORF) coded on the minus strand: C, S, X, and P region

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HBV 大球形颗粒 管形颗粒 小球形颗粒

Etiology : 

Etiology Hepatitis B virus (HBV) Four open reading frames (ORF) S region: include pre-s1, pre-s2 and S gene, encoded pre-s1 protein, pre-s2 protein and HBsAg. Pre-s1 protein + pre-s2 protein + HBsAg—large protein Pre-s2 protein + HBsAg—middle protein HBsAg—major protein C region included pre-c and C gene, encode HBeAg and HBcAg X region encoded HBxAg P region encoded DNA polymerase

etiology : 

etiology Three antigen-antibody system HBsAg-- anti-HBs system: Include HBsAg, anti-HBs, pre-s1,s2 antigen and anti-pres1, s2 HBsAg appears 1-2 weeks (late to 11-12 weeks) after exposure, persists for 1-6 weeks( even 5 months) in acute hepatitis B. In chronic patients or carrier, HBsAg persist many years HBsAg antigencity but no infectivity HBsAg is the marker of infectivity HBsAg can be found in humors and secretions: salive, urine, semina, tears, sweat and breast milk 10 subtype of HBsAg, 4 major subtypes: adr, adw, ayr, ayw. Anti-HBs appear after HBsAg disappear several weeks (or months) anti-HBs is protective antibody, can persist for many years pre-s1 and pre-s2 antigens appear following HBsAg . They are the marker of infectivity. Anti –pre s2 has the action of clearing virus

Etiology : 

Etiology HBcAg—anti-HBc system HBcAg can be found in the nuclei of liver cells, no free HBcAg in serum HBcAg is the marker of replication of HBV The stage called window phase Anti-HBc IgM is a marker of acute infection and acute attack of chronic infection of HBV. Anti-HBc IgG is the marker of past infection, high titer means low level replication of HBV

Etiology : 

Etiology HBeAg—anti-HBe system HBeAg is a soliable antigen HBeAg is a reliable indicator of active replication of HBV Anti-HBe is a marker of reduced infectivity. If exist long may be a marker of integration of HBV into liver cell

Etiology : 

Etiology The marker of molecular biology of HBV HBV-DNA The direct indicator of HBV infection Can integrate into the genome of hepatocytes HBV DNA polymerase Possesses the ability of reverse transcriptase and the indicator of the ability of replication of HBV

Etiology : 

Etiology HBxAg Related to chronicity, activity of hepatitis B or liver cancer Resistance Resistant to heating and common disinfections. Chimpanzee is susceptible to HBV

Etiology : 

Etiology Hepatitis C virus (HCV) HCV is a member of flavivirus family. HCV genome is a single stranded positive-sense RNA and contains 9.4kb The genome contains 5’-non coding region, C region, E region and NS region HCV genome may be divided into many types and subtypes. Resistance Antigen-antibody system The concentration of HCV in blood is low, HCV Ag has not be detected, anti-HCV is the indicator of infection and the marker of infectivity HCV-RNA HCV-RNA may be detected from blood or liver tissue, it’s the direct evidence of infectivity

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Etiology : 

Etiology Hepatitis D virus (HDV) HDV (Delta hepatitis virus) is a kind of defective virus HDV is found in the nuclei of infected hepatocytes and replicate HDV genome is a circular single strand RNA and contains 1.7kb The replication of HDV depends on HBV or other hepadnavirus, coated by HBsAg in blood HDV has one antigen-antibody system No free HDAg is detected in blood, it’s in the nuclei of hepatocytes; anti-HDV can be detected by RIA or ELISA in serum HBV and HDV co-infection or superinfection may make the disease exacerbation and may lead to fulminant hepatitis HDV RNA may be detected from liver cells, blood or humor. Resistance

Etiology : 

Etiology Hepatitis E virus (HEV) HEV is a member of calicivirus family. HEV is a spherical nuenveloped icosahedral particles. HEV genome is a single strand, positive –sense RNA (7.5kb), include structure and non-structure region Three ORF ORF-1: encoding non-structure protein ORF-2: encoding neucleocapside protein ORF-3:encoding a part of neucleocapside protein 2 subtype of HEV founded : Burma subtype and Mexico subtype ; or epidemic strain and sporadic strain HEV replication within hepatocytes and via bill tract is discharged Monkeys and chimpanzee are susceptible to HEV One antigen-antibody system HGV, TTV

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Epidemiology : 

Epidemiology Source of infection Hepatitis A and E: patients with acute hepatitis and person with sublinical infection Hepatitis B, C and D: patients with acute, chronic hepatitis B, C, and D and carriers Route of transmission Hepatitis A and E: fecal-oral route predominantly

Epidemiology : 

Epidemiology Route of transmission Hepatitis B, C, and D: humoral transmission (parenteral transmission) Mather to infent transmission(vertical transmission) Sexual contact transmission Insect transmission

Epidemiology : 

Epidemiology Susceptibility and immunity of population Hepatitis A Most adult has anti-HAV due to covert infection. Infent under 6 month acquired antibody from mother. Young children is susceptible Hepatitis B Infents are susceptible to HB after boring .HBV infection developed in infents children and teenages Hepatitis C Population is common susceptible. Anti-HCV is not protective antibody. Hepatitis D Common susceptible Hepatitis E Common susceptible. Children appear covert infection, adult show overt infection

Epidemic feature : 

Epidemic feature Sporadic occurrence Hepatitis A:sporadic occurrence may seen in developing countries of high epidemic area Hepatitis B:sporadic occurrence is major mode of onset for HB.,there is family clustering phenomenon which is related with vertical infection Hepatitis C:non-transfusion HC is called sporadic HC by mother to infant or life CONTACTTRASMISSION

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Hepatitis E:in non-epidemic area,HE is sporadic occurrence Outbreak epidemic Due to food and water are contaminated lead to outbreak of HA and HE Seasonal distribution HA:most cases developed in autumn and winter HE:most cases developed in summer and autumn

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Geographic distribution HA:geographic distribution is not obvious HB:may be divided into three areas High epidemic area:HBsAg carrier rate is 8-20% Moderate epidemic area: HBsAg carrier rate is 2-7% Low epidemic area: HBsAg carrier rate is 0.2-0.5% HC:no different infection rate HD:world wide distribution HE:developing countries are major epidemic areas such as Asia,Africa

pathogenesis : 

pathogenesis Hepatitis A: HAV invade into human body by mouth and cause viremia.After one week,the HAV reach liver cells replicate within.Then enter intestien with bill and appear in feces.someone believe that damage of liver cells maybe caused by immune response.Due to: HAV does not cause cytopathy

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After HAV replicating and discharging,liver cells damage begin Animal experiment proved that immune complex may attend the pathogenesis of HA Complement level reduce the pathogenesis maybe following:activated T cell secrete γ-INF that promote the representation of HLA-Ⅰantigen on the liver cells,CTL may kill the target cell infected with HAV

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Hepatitis B: HBV invade into the human body by skin and mucosa,via blood flow enter the liver and other organs such as pancreas,bill duct,vessels,WBC,bone marrow,glomerular basement membrans HBcAg,HBsAg,HBeAg and HLA-Ⅰappear on the liver cells infected with are recognized by CTL simultaneously and lead to the cytolysis of liver cells

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Help T cell are activated by the receptor of HLA-Ⅱ on its surface combing with HBsAg, HBcAg and HLA-Ⅱ antigen on the B cells promote B cell to release anti-HBs and clear HBV The representation of HBcAg on the liver cells may cause cytopethy High degree representation of HBsAg within liver cells but the secretion is not enough lead to ground-glass-like change of liver cells

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Antigen-antibody complex precipitated on the wall of blood vessels and glomerular basement membrans causing nephritis or noduse polyarteritis,fever,rush and arthralgia called serum sick-like reaction TNF,IL-1,IL-6 may play roles in pathogenesis Chronicity of hepatitis B is related to immune tolerance, immune suppress and genetic factors HBV infection is related to HCC closely

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Hepatitis C Is similar to that of HB. CTL and some cytokines play an important action The chronicity is related to the variability of gene HCV infection is related to HCC closely but HCV does not integrate to liver cells, so from HCV infection to HCC may be related to chronic inflammation and cirrhosis

Pathology : 

Pathology Degeneration Necrosis Regeneration Infiltration of inflammatory cells Hyperplasia of interstitial cells

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Acute viral hepatitis The degeneration of liver cells include ballooning degeneration, fatty degeneration, acidophilic degeneration Cell nucleus vacuolar degeneration Focal or spotty necrosis and regeneration The infiltration of mononuclear cell, plasmocyte ,lymphocyte in portal area Cholestasis and form of bile thrombas in bile capillaries of liver Piecemeal necrosis

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Chronic viral hepatitis Mild chronic hepatitis G 1-2,S 0-2 Degeneration, spotty, focal necrosis, acidophilic body Portal may have or no the infiltration of inflammation cell, mild PN or enlarged The structure is intact Moderate chronic hepatitis(CAH) Portal area have obvious inflammation, with moderate PN Severe inflammation with BN of intralobule Form fibrous septum, most the structure of lobule reserved

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Severe chronic hepatitis Portal area has severe inflammation with severe PN BN of extensive range involving several lobulus Much more fibrous septums distortion of lobule structure or form early liver cirrhosis Fulminant viral hepatitis(hepatitis gravis) Acute hepatitis gravis: liver cells show massive necrosis including great among of liver cells. Necrosis and reticular fiber network collapse, so the liver is greatly reduce in size-acute yellow hepatic etrophy

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Subacute hepatitis gravis Except massive necrosis, there are ball-like regeneration of liver cells New connective tissue which form fibrous band and separate the liver cells regenerated forming pseudolobuli Bile capillaries hyperplasia Chronic hepatitis gravis: base on the pathologic changes of chronic hepatitis or liver cirrhosis, there are massive or sub massive necrosis of liver cells

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Cholestatic viral hepatitis There are the changes of acute hepatitis There is obvious cholestasis In severe cases, the liver cells may appear glandular duct like Portal area shows edeme and small bile duct is dilation

pathophysiology : 

pathophysiology Jaundice the jaundice is mainly hepatocytic jaundice and part obstructive jaundice Hepatic encephalopathy Retention of toxic material lead to poisoning of CNS Imbalance of aminoacid False neurotransmitter hypothesis Other evoked factors

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Hemorrage Deficiency of many kinds of blood coagulating factors, DIC, thrombucytopenia lead to hemorrage Acute renal failure (hepatic-renal syndrome) Hepatopulmonary syndrome Ascites

Clinical manifestation : 

Clinical manifestation Incubation period HA 15-45 days 30 days HB 30-180 days 70 days HC 15-150 days 50 days HD similar to HB HE 10-70 days 40 days Clinical types Acute viral hepatitis Acute icteric viral hepatitis Acute anicteric viral hepatitis

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Chronic viral hepatitis Mild chronic viral hepatitis Moderate chronic viral hepatitis Severe chronic viral hepatitis Hepatitis gravis Acute hepatitis gravis Subacute hepatitis gravis Chronic hepatitis gravis Cholestatic viral hepatitis Acute viral hepatitis Acute icteric viral hepatitis the cause may be 2-4 months and divided three periods

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Preicteric period In HA, HE, the onset is abrupt with fever; but HB, HC, the onset is insidious. The initial symptoms: loss of appetite, nausea, vomiting lassitude, abdominal pain and diarrhea. The end of the period, the urine darkens. A few patients, especial children, fever, headache, upper respiratory tract symptome are main manifestations The duration of this period varies from 1-21 days, average 5-7 days Ictoric period The urine deepens continuously and jaundice appears on the skin and sclera within 2 weeks Subjective symptoms is abate Pruritus may appear about 1 week Liver palpable 7%, spleen palpable 20% The period lasts 2-6 weeks

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Convalscent period The jaundice disappear gradually, symptoms abate or disappear Liver and spleen retract, liver function return to normal The period lasts 2 weeks to 4 months, average 1 month About 10% of HB and 50% of HC will become chronic hepatitis Acute hepatitis D: Co-infection with HBV Super-infection with HBV Acute hepatitis E is similar to acute hepatitis A, but cholestasis is obvious and symptoms and signs is severe. If women with pregnancy suffer from the HE--fulminant hepatitis If HB super-infect HEV or HCV--fulminant hepatitis

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Acute anicteric hepatitis All of 5 kinds of hepatitis virus can cause acute anicteric hepatitis. This type is most common. Important source of infection Chronic viral hepatitis Only appear in HBV, HCV and HDV infection Mild chronic hepatitis The course is more than half year Fatigue, dizziness, digestive tract symptoms, dull pain of liver, enlarged liver tenderness or spleen tenderness,lower degree of fever, ALT↑, the pathology change has only mild The course may persist many years

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Moderate The course →half year The symptom are obvious Spider nevus, liver palms, hepatic face Dysfunction of liver Accompany the lesions of other organs and presence of autoantibody Reverse the ratio of albumin/globulin Biopsy show the changes of mild CAH Severe Except symptoms and signs mentioned, the biopsy show the changes of early cirrhosis and clinical manifestations of compensatory cirrhosis

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Hepatitis gravis All of five kinds of hepatitis virus can cause this type of hepatitis. The incidence is only 0.2-0.5%, but the mortality is the highest. Acute hepatitis gravis The onset may begin in a typical acute icteric hepatitis, but within 10 days Jaundice deepens rapidly Vomit is frequent Obvious anorexia Hemorrhage The liver shrinks in size Toxic intestinal tympenice Prothrombin time is prolonged Ascites appear Acute renal failure Hepatic encephalopathy

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Subacute hepatitis gravis The course of AIH is more than 10 days The hepatic encephalupathy appear later The course may be several months The postnecrotic cirrhosis may develop Chronic hepatitis gravis Based on chronic hepatitis or cirrhosis developed subacute hepatic necrotic Cholestatic hepatitis Intra hepatic cholestatic jaundice for a long time(2-4 months or longer) Pruritus Pale feces Hepatomogaly

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Subjective symptoms is slight Course 2-6 months Recovery is complete Manifostations of hepatitis for special population Characteristics of hepatitis for child Characteristics of hepatitis for the senility The character of hepatitis of pregnancy period

Laboratory examination : 

Laboratory examination Liver function Serum transaminase ALT(alanine transferase) ↑ AST(aspartase transferase) ↑ ALP (Alkaline phosphatase) ↑ in chronic hepatitis LDH (Lactate dehydrogenase) ↑ Serum protein Albumin ↓ In chronic hepatitis Ig ↑↑ The ratio of A/G ↓ Bilirubin Urobilinogen ↑in early stage of AIH

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Urobilinogen and urobilin ↑in icteric stage Urobilin is positive and urobilinogen may be negative in cholestatic hepatitis In AIH, the directive bilirubin and indirective bilirubin ↑ Prothrombin time may be prolonged especially in fulminant hepatitis Blood amonia examination Detection of the markers of hepatitis virus Hepatitis A Serologic marker Anti-HAVIgM: recent infection Anti-HAVIgG: past infection

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Marker of feces HAV particles may be detected by RIA or IEM Isolation of HAV may use tissue culture or animal inoculation Hepatitis B Sero-immunologic marker HBsAg anti-HBs HBcAg anti-HBc HBeAg anti-Hbe Molecular biological marker DNAp HBV DNA Immune tissue chemistry examination Hepatitis C Serological marker Anti-HCVIgM Anti-HCVIgG

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Molecular biologic marker HCV RNA may be detective by RT-PCR 1-2 weeks after infection of HCV Quality of HCV RNA Immune tissue chemistry method detect HCAg within liver cells Hepatitis D HDAg anti-HDV HDV RNA Hepatitis E Anti-HEVIgG,Anti-HEVIgm RT-PCR HEV particais: IF IEM

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Ultra-sound examination Liver biopsy Other laboratory examination Blood routine Urine routine

Complication and prognosi : 

Complication and prognosi HB Infection of biliary tract, pancreatitis, gastro-enteritis Diabetes Hemolytic anemia, aplastic anemia Myocarditis, polyarteritis, nodose Glomerulo-nephritis, renal tubular, acidosis Skin: allergic purpure Cirrhosis HCC

Diagnosis : 

Diagnosis Epidemiological data HA, HE: food, water, seasonal, age HB, HC: blood and blood product transfusion, contact history, inoculation history Clinical diagnosis Acute hepatitis Chronic hepatitis

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Degree of damage of liver

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Hepatitis gravis Etiological diagnosis HA: Serum anti-HAVIgM , Feces HAV HB: HBsAg HBeAg HBcAg anti-HBc HBVDNA DANp HC: anti-HCV IgM IgG HD: HBsAg HDAg anti-HDV HE: anti-HEV IgM IgG HEVRNA HEV particals in feces

Differential diagnosis : 

Differential diagnosis Acute icteric hepatitis Must be differentiated with the jaundice caused by another disease Hemolytic jaundice Extrahepatic obstructive jaundice Hepatitis caused by another reasons Toxic hepatitis Infective toxic hepatitis Mononucleosis Alcohol hepatic disease Schistosomiosis Wilson disease

Treatment : 

Treatment Acute hepatitis Isolation HA: 3 weeks after onset HB: HBsAg become negative HC: HCVRNA become negative HE: 2 weeks after onset Rest Diet Anti-virus therapy hepatinice

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Chronic hepatitis Symptomatic therapy Diet Rest Hepatinice Supporting therapy Immunomodulator Fuminant hepatitis General and supporting therapy Rest: strict bed rest diet

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Supporting therapy Symptomatic therapy Hemorrhage: fresh blood, prothrombin complex, platelet Hepatic encephalopathy Prevention and treatment of amino poisoning Recovery normal neurotransmitter Sodium glutamate and arginine Treatment of cerebral edema Control infection Prevention and treatment of renal failure Promoting the growth of liver cells Liver transplantation Cholestatic hepatitis: similar to acute hepatitis

prevention : 

prevention Control of source of infection Cut off the route of transmission Protection of susceptible population Active immunity Passive immunity

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