## Most Common Cause of Portal Hypertension in Variceal Bleeding ### Epidemiology **Key Point:** Cirrhosis accounts for >90% of portal hypertension cases in developed countries, with alcohol-related liver disease being the leading cause of cirrhosis in the Western world and increasingly in urban India. ### Pathophysiology of Esophageal Varices Portal hypertension (portal pressure >12 mmHg) develops when cirrhosis causes: 1. Increased intrahepatic vascular resistance (fibrosis, nodule formation) 2. Splanchnic vasodilation (nitric oxide overproduction) 3. Portosystemic collateral formation → esophageal varices ### Why Alcohol-Related Cirrhosis Is Most Common | Feature | Alcohol-Related Cirrhosis | Other Causes | |---------|--------------------------|---------------| | Prevalence in variceal bleeders | ~60–70% in developed countries | 30–40% combined | | Mechanism | Hepatocyte necrosis → fibrosis | Varied (viral, autoimmune, vascular) | | Reversibility | Partial (with abstinence) | Variable | | Progression speed | Rapid with continued use | Slower | **High-Yield:** In a patient with variceal bleeding and alcohol history, cirrhosis is the presumed diagnosis until proven otherwise. ### Clinical Pearl Esophageal varices are a hallmark of decompensated cirrhosis. The presence of varices indicates portal pressure >12 mmHg and carries a 1-year rebleeding risk of ~60% without prophylaxis. ### Differential Causes of Portal Hypertension - **Prehepatic:** Portal vein thrombosis, splenic vein thrombosis (rare causes of variceal bleeding) - **Intrahepatic:** Cirrhosis (alcohol, viral hepatitis, NAFLD, autoimmune), schistosomiasis (endemic areas) - **Posthepatic:** Budd-Chiari syndrome, constrictive pericarditis (uncommon) **Warning:** Budd-Chiari and portal vein thrombosis are rare causes and would not explain the chronic liver disease picture in this patient. [cite:Harrison 21e Ch 297]
Sign up free to access AI-powered MCQ practice with detailed explanations and adaptive learning.