PORTAL HYPERTENSION & CHRONIC LIVER DISEASE SEAN CHEN ST GEORGE HEPATOBILIARY & PANCREATIC WORKSHOP 31/05/2014.

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PORTAL HYPERTENSION & CHRONIC LIVER DISEASE SEAN CHEN ST GEORGE HEPATOBILIARY & PANCREATIC WORKSHOP 31/05/2014

CHRONIC LIVER DISEASE Chronic Liver disease Progressive destruction and regeneration process of the liver Associated with cell death, bridging fibrosis and long term cirrhosis Classification of chronic liver disease Child-Pugh Score Originally derived to predict surgical mortality, now used to assess prognosis of chronic liver disease 3 classes of severity with associated 1 and 2 year survival rates

CAUSES OF CHRONIC LIVER DISEASE Viral Hepatitis B Hepatitis C Cytomegalovirus Epstein Barr Virus Autoimmune Autoimmune chronic hepatitis Primary biliary cirrhosis Primary sclerosing cholangitis Toxin Alcoholic liver disease Methotrexate Amiodarone Nitrofurantoin Metabolic Non-Alcoholic fatty liver disese Haemochromatosis Wilson’s Disease

PORTAL VEIN Upward continuation of the superior mesenteric and splenic vein Tributaries Superior mesenteric vein Splenic vein Right and left gastric vein Superior pancreaticoduodenal vein Cystic vein Periumbilical vein Contribute 75% of blood supply to the liver Brings nutrient and toxin rich blood to the liver Normal intraluminal pressure of 5 to 10 mmHg

PORTAL HYPERTENSION Pathological increase in pressure in portal venous system as compared to the rest of the body. Where the pressure gradient between the portal vein and IVC (Liver portal perfusion pressure) is > 5mmHg Pathophysiology – Ohms Law P = QR (pressure = resistance x inflow) Changes in increasing portal resistance or blood inflow leads to increased portal pressure and vice versa

CAUSES OF PORTAL HYPERTENSION Pre-hepatic Portal vein thrombosis Congenital atresia Post hepatic Hepatic vein thrombosis or IVC thrombosis Constrictive pericarditis Intrahepatic Cirrhosis Fibrotic disease Wilson’s disease Haemochromatosis Schistosomiasis Massive fatty changes Diffuse granulomatosis disease

MEASUREMENT OF PORTAL PRESSURES No way of indirect measurement Direct measurement involves measuring and comparing the pressure of both the portal and hepatic veins Gold standard - Hepatic Vein Pressure Gradient (HVPG) > 5 mmHg portal hypertension, > 10 mmHg clinically significant Difference between the Wedge Hepatic venous Pressure (WHVP) and Free Hepatic venous Pressure (HVPG)

HVPG WHVP Angiographic procedure Obtained by measuring the pressure in the hepatic vein after a catheter is used to wedge the hepatic vein shut (measurement of static blood pressure) Measures hepatic sinusoidal pressure FHVP Angiographic procedure Obtained by measuring the pressure in the hepatic vein at 2 – 4cm from opening to IVC

TREATMENT OF OESOPHAGEAL VARICES Most causes of portal hypertension can’t be treated and most acute treatment deal with management of oesophageal varices Medication (beta-blocker +/- vasoactive drug depending on presence of varcieal bleeding) Endoscopic procedure TIPS Surgical Portacaval shunt

TREATMENT OF PORTAL HYPERTENSION (TIPS) Transjugular Intrahepatic Portasystemic Shunt (TIPS) Angiographic procedure to form a tract between hepatic vein and intrahepatic segment of portal vein Indications Uncontrolled Variceal Haemorrhage not responding to endoscopic and medical management Refractory ascites Hepatic pleural effusion Contraindications Severe and progressive liver failure Severe encephalopathy Polycystic liver disease Severe right heart failure

TREATMENT OF PORTAL HYPERTENSION (PORTACAVAL SHUNT) Surgical procedure to create a shunt from the portal vein to the IVC Indications Uncontrolled variceal bleeding non-responsive to medical therapy (associated with high mortality) Early Budd-Chiari Syndrome Intractable ascities unresponsive to nonsurgical therapy Failed TIPS Contraindications Thrombosis of portal vein without liver disease Hepatic artery occlusion

LIVER TRANSPLANT Indications of liver transplant Life threatening acute or chronic liver disease not amenable to alternative therapy Extrahepatic manifestations of inborn error of metabolism Referred by a recognised liver transplant unit Contraindications HIV Active alcohol or substance abuse Systemic infection Inability to comply with transplant medication regimen (psuchiatric disorders) Other life limiting medication co-morbidities

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