Stoelting's Anesthesia and Co-Existing Disease · 8th Edition
Diseases of the Liver and Biliary Tract
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Key Takeaways
- Portal vein blood provides volume but limited oxygen, while hepatic artery compensates through adenosine-mediated autoregulation in normal liver physiology.
- Hepatocellular injury shows elevated transaminases, cholestasis displays alkaline phosphatase elevation with conjugated hyperbilirubinemia, and synthetic dysfunction manifests as albumin depletion and coagulopathy.
- Acute liver failure requires rapid recognition due to severe coagulopathy and encephalopathy occurring within weeks, often from acetaminophen overdose.
- Cirrhosis generates portal hypertension and multiple complications including variceal hemorrhage, ascites, hepatic encephalopathy, and hepatorenal syndrome requiring different management approaches.
- Hepatorenal syndrome involves progressive renal vasoconstriction despite splanchnic vasodilation, while hepatopulmonary syndrome produces intrapulmonary shunting worsened by positional changes.
- Surgical risk stratification uses Child-Turcotte-Pugh or Model for End-Stage Liver Disease scores, with transjugular portosystemic shunt and transplantation as definitive interventions.
Chapter SummaryWhat this audio overview covers
Hepatic pathology encompasses a broad spectrum of conditions affecting the liver and biliary system, ranging from acute injury to irreversible cirrhotic change. The liver's dual blood supply from the portal vein and hepatic artery creates a unique oxygen delivery dynamic that becomes precarious in disease states, as the portal circulation provides most volumetric flow but minimal oxygenation while the arterial supply compensates through adenosine-mediated autoregulation. Laboratory assessment of liver dysfunction follows recognizable patterns: hepatocellular injury manifests through elevated transaminases with characteristic ratios suggesting etiology, cholestasis involves alkaline phosphatase and conjugated hyperbilirubinemia indicating impaired bile flow, and synthetic dysfunction reveals albumin depletion and coagulopathy reflecting advanced parenchymal loss. Viral hepatitis, particularly hepatitis B and C, remains a leading chronic etiology despite revolutionary antiviral advances, while alcohol-associated and nonalcoholic fatty liver disease increasingly dominate as causes of cirrhosis and transplant indication. Acute liver failure represents a medical emergency characterized by rapid aminotransferase elevation, severe coagulopathy, and encephalopathy within weeks, most commonly triggered by acetaminophen toxicity. Cirrhosis marks the transition point to portal hypertension, a state of increased vascular resistance generating a cascade of life-threatening complications. Variceal hemorrhage emerges as the most lethal complication, while ascites may progress to spontaneous bacterial peritonitis requiring empirical antimicrobial therapy. Hepatic encephalopathy develops from inadequate ammonia clearance and accumulation of neurotoxic nitrogenous metabolites, manifesting across a neuropsychiatric spectrum. Hepatorenal and hepatopulmonary syndromes represent systemic manifestations of advanced portal hypertension, with hepatorenal syndrome involving progressive renal vasoconstriction despite splanchnic vasodilation, and hepatopulmonary syndrome producing intrapulmonary shunting that paradoxically worsens with patient positioning. Perioperative management demands stratification using validated scoring systems such as Child-Turcotte-Pugh or Model for End-Stage Liver Disease to predict surgical risk and mortality. Interventions range from transjugular portosystemic shunt procedures decompressing portal circulation to partial hepatectomy for neoplasm resection and ultimately liver transplantation as definitive therapy for end-stage disease and acute failure.