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Ⅰ. Pathophysiology

1.
Acute hepatitis : hepatocyte의 infection, toxin 또는 metabolic injury가 원인
2.
Hepatic failure (1) Cellular level : Loss of metabolic & synthetic function (2) Gross level : Portal HTN, Ascites formation, Portal-systemic shunt 발생
3.
Liver synthetic function (1) Vit K-dependent clotting factor (II, VII, IX, X) (2) Protein C & S (3) Other elements of clotting & thrombolytic processes → Uncontrolled bleeding is one of the life-threatening feature of liver disease
4.
Portal HTN (1) Cirrhotic liver 때문에 생긴 portal vein의 hydrostatic pressure 증가 (2) Esophageal & gastric varix, portal-systemic shunting 유발
5.
Ascites (1) Due to Portal HTN, hypoalbuminemia, poor renal management (Na+, Water) (2) Respiratory compromise, SBP 유발
6.
Encephalopathy (1) Hallmark of liver failure (2) Large intestinal protein load : high protein meal, GI bleeding (3) Ammonia level이 mental status와 확실히 correlation 하는 것은 아니지만 reasonable하게 영향을 끼치는 factor (4) Fulminant liver failure ① Cerebral edema & Increased ICP ② 이러한 End-stage state에서 loss of autoregulation of cerebral blood flow, ammonia-related edema, systemic inflammatory response 발생 → Deadly complication
7.
Jaundice (1) Can be present in any stage of liver disease
(2) Pre-hepatic jaundice : Liver의 능력을 넘어서 overproduction, hemolysis, inborn errors of bilirubin metabolism (3) Hepatic jaundice : by viral infection, toxic causes (4) Post-hepatic jaundice : Conjugated bilirubin 증가, Excretion의 막힘 (ex: pancreatic tumor, CBD stone)