NAVLE Gastrointestinal and Digestive

Canine Hepatic Cirrhosis Study Guide

Hepatic cirrhosis represents the irreversible end-stage of chronic hepatitis, characterized by diffuse fibrosis, regenerative nodules, and architectural distortion.

Overview and Clinical Importance

Hepatic cirrhosis represents the irreversible end-stage of chronic hepatitis, characterized by diffuse fibrosis, regenerative nodules, and architectural distortion. According to the WSAVA, cirrhosis is the histological endpoint of progressive hepatic fibrosis where normal lobular architecture is replaced by abnormal nodular regeneration surrounded by fibrous septa.

Understanding cirrhosis is essential for the NAVLE because it tests your ability to recognize breed predispositions, interpret imaging and laboratory findings, manage complications including portal hypertension and hepatic encephalopathy, and provide appropriate prognostic information.

Stage Pathological Events
1. Hepatocyte Injury Ongoing hepatocyte apoptosis and necrosis from copper toxicity, immune-mediated injury, drugs, or idiopathic causes releases inflammatory mediators
2. Stellate Cell Activation Hepatic stellate cells (HSCs) transform from quiescent vitamin A-storing cells to activated myofibroblasts that produce extracellular matrix (ECM)
3. ECM Accumulation Total collagen content increases 3- to 10-fold; collagen types I and III predominate with cross-linking modifications
4. Architectural Disruption Bridging fibrosis (portal-portal or portal-central) develops, followed by nodule formation, portal hypertension, and acquired portosystemic shunts (APSS)

Definition and Pathophysiology

WSAVA Definition

Cirrhosis is the histological endpoint of chronic hepatitis characterized by:

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