In a 48-year-old woman with established cirrhosis, portal hypertension develops with formation of portosystemic collaterals. Which is the most common site of variceal formation in portal hypertension?

Explanation

## Most Common Site of Varices in Portal Hypertension **Key Point:** The lower third of the esophagus is the most common site of variceal formation in portal hypertension, accounting for 70–80% of all variceal bleeding in cirrhotic patients. ### Anatomy of Portosystemic Collaterals ```mermaid flowchart TD A[Portal Hypertension]:::outcome --> B[Increased portal pressure > 12 mmHg]:::outcome B --> C{Collateral Formation Sites}:::decision C -->|Esophageal varices| D[Lower 1/3 esophagus<br/>Left gastric vein → azygos]:::action C -->|Gastric varices| E[Fundus & cardia<br/>Short gastric veins]:::action C -->|Rectal varices| F[Rectum/sigmoid<br/>Superior rectal → middle rectal]:::action C -->|Duodenal varices| G[Rare: duodenum<br/>Gastroduodenal vein]:::action D --> H[Most common bleeding site]:::urgent ``` ### Frequency of Variceal Sites in Cirrhosis | Site | Frequency | Bleeding Risk | Mortality if Bleeds | |------|-----------|---------------|---------------------| | **Esophageal (lower 1/3)** | **70–80%** | **High (40–50% bleed)** | **20–30%** | | Gastric fundus | 15–20% | High | 25–35% | | Rectal | 5–10% | Low | Low | | Duodenal | <2% | Very rare | High if occurs | | Ectopic (jejunal, colonic) | <1% | Rare | Variable | **High-Yield:** Esophageal varices are the most common and most clinically significant. They form because: 1. The left gastric (coronary) vein drains the lower esophagus into the portal vein 2. Under portal hypertension, flow reverses and dilates esophageal submucosal veins 3. These thin-walled varices lie in a high-pressure, low-compliance region (esophageal mucosa) 4. Mechanical trauma from food/swallowing triggers rupture ### Why Esophageal Varices Bleed Most Often **Clinical Pearl:** Esophageal varices are responsible for 80–90% of all variceal hemorrhage in cirrhotic patients. Gastric varices, though less common, have a higher mortality per bleed (25–35% vs. 20–30%) because they are deeper and harder to endoscopically treat. **Mnemonic: ESOPHAGEAL VARICES FIRST** — **E**sophageal (lower third), **S**ubmucosal location, **O**pen to trauma, **P**ortal hypertension drives flow, **H**igh bleeding frequency, **A**zygos drainage, **G**astric secondary, **E**ctopic rare, **A**lways screen endoscopically, **L**arge varices = high risk. ### Clinical Significance - **Screening:** Upper endoscopy is the gold standard for detecting esophageal varices in all cirrhotic patients - **Prophylaxis:** Beta-blockers (propranolol, carvedilol) reduce portal pressure and prevent first variceal bleed - **Treatment:** Endoscopic variceal ligation (EVL) is superior to sclerotherapy for esophageal varices [cite:Robbins 10e Ch 18]