Which of the following vessel is most commonly involved in hemorrhage from duodenal ulcer?
**Core Concept**
The question is testing the student's knowledge of the common sites of bleeding from duodenal ulcers, which is a complication of peptic ulcer disease. Duodenal ulcers can erode into nearby blood vessels, leading to hemorrhage. The most commonly involved vessel is related to the anatomy of the duodenum.
**Why the Correct Answer is Right**
The gastroduodenal artery is the most common source of bleeding from duodenal ulcers. This is because the gastroduodenal artery is closely related to the duodenum and its branches can easily be eroded by the ulcer crater. The gastroduodenal artery is a branch of the common hepatic artery, which supplies blood to the stomach and duodenum. The artery runs along the superior border of the duodenum, making it vulnerable to ulceration.
**Why Each Wrong Option is Incorrect**
* **Option A:** The left gastric artery is a branch of the celiac trunk and primarily supplies the stomach. It is not commonly involved in bleeding from duodenal ulcers.
* **Option B:** The superior mesenteric artery is a major artery that supplies the small intestine, but it is not directly related to the duodenum and is not a common source of bleeding from duodenal ulcers.
* **Option D:** The right gastroepiploic artery is a branch of the gastroduodenal artery and supplies the stomach. While it can be involved in bleeding from gastric ulcers, it is not the most common vessel involved in bleeding from duodenal ulcers.
**Clinical Pearl / High-Yield Fact**
Remember the "rule of twos" for duodenal ulcers: 2/3 of duodenal ulcers occur in the first part of the duodenum, 2/3 of bleeding from duodenal ulcers occurs from the gastroduodenal artery, and 2/3 of patients with bleeding from duodenal ulcers are over 60 years old.
**Correct Answer:** C. The gastroduodenal artery is the most common source of bleeding from duodenal ulcers.