Chapter 38: Disorders of Hepatobiliary and Exocrine Pancreas Function

Hepatitis A serves as a model infectious liver disease, presenting with characteristic features including jaundice, anorexia, and abdominal discomfort, with transmission occurring primarily through fecal-oral routes in congregate settings such as childcare facilities. The chapter emphasizes chronic liver diseases of major clinical significance, particularly alcoholic liver disease resulting from prolonged ethanol metabolism and the increasingly prevalent nonalcoholic fatty liver disease affecting metabolically compromised populations. Advanced liver disease progresses to cirrhosis, characterized by hepatic fibrosis and architectural distortion, which precipitates portal hypertension and severe complications including ascites formation. Management of ascites-related complications involves therapeutic paracentesis and interventional techniques such as transjugular intrahepatic portosystemic shunting to decompress the portal venous system. The chapter also addresses biliary pathology including cholelithiasis and associated cholecystitis, examining the physicochemical factors promoting gallstone formation. Genetic cholestatic disorders including progressive familial intrahepatic cholestasis and Alagille syndrome are discussed as inherited conditions disrupting bile flow and hepatocellular function. Throughout the chapter, the interconnected relationship between hepatic injury mechanisms, inflammatory responses, fibrotic progression, and systemic complications is emphasized, providing students with a comprehensive framework for understanding how primary insults to liver and pancreatic tissue initiate cascading pathophysiologic changes that define clinical presentations and guide therapeutic interventions in hepatobiliary disease.