A 58-year-old man is brought to the emergency department after vomiting a large amount of bright red blood. He has a history of alcohol-associated cirrhosis and has had progressive abdominal distention for several months. Temperature is 36.8°C (98.2°F), blood pressure is 86/52 mm Hg, pulse is 124/min, and respirations are 22/min. Physical examination shows scleral icterus, spider angiomas, ascites, and splenomegaly. Emergency upper endoscopy shows actively bleeding varices in the distal esophagus.
Dilation of which of the following venous anastomoses most directly explains this finding?
The correct answer is:
A) Left gastric vein and esophageal veins
This patient has portal hypertension due to cirrhosis, leading to dilation of portosystemic venous anastomoses. Distal esophageal varices arise when blood from the portal system is redirected through the left gastric vein into esophageal veins, which drain into the azygos system and then the superior vena cava. Increased pressure in these thin-walled submucosal veins can cause life-threatening upper gastrointestinal bleeding. The location of bleeding in the distal esophagus identifies the left gastric–esophageal venous anastomosis as the relevant pathway.
Answer choice B: Paraumbilical veins and superficial epigastric veins, is incorrect. This portosystemic anastomosis occurs near the umbilicus and can produce dilated abdominal wall veins known as caput medusae. It does not cause distal esophageal varices or hematemesis.
Answer choice C: Short gastric veins and left gastroepiploic vein, is incorrect. These veins are part of the portal venous drainage of the stomach and spleen through the splenic vein. They do not form the clinically important portosystemic anastomosis responsible for distal esophageal varices.
Answer choice D: Superior rectal vein and inferior rectal veins, is incorrect. This is a portosystemic anastomosis between the superior rectal vein, which drains to the portal system through the inferior mesenteric vein, and the inferior rectal veins, which drain to the internal pudendal and internal iliac veins. Dilation can contribute to anorectal varices, not distal esophageal varices.
Answer choice E: Superior rectal vein and middle rectal veins, is incorrect. The superior rectal vein drains to the portal system through the inferior mesenteric vein, whereas the middle rectal veins drain to the internal iliac system. This anastomosis is located in the rectum and would not explain bleeding from varices in the distal esophagus.
Key Learning Point
Distal esophageal varices result from portal hypertension causing dilation of the portosystemic anastomosis between the left gastric vein and esophageal veins draining to the azygos system.
