A 35-year-old woman with epigastric pain, which did not improve on ranitidine, is found to have a nonhealing pyloric channel ulcer on upper endoscopy. Her serum calcium level is 12 mg/dL.
**Core Concept**
The patient's presentation of a nonhealing pyloric channel ulcer and elevated serum calcium levels suggests a possible association with hyperparathyroidism, which can lead to peptic ulcer disease due to increased gastrin levels.
**Why the Correct Answer is Right**
The mechanism behind this association involves the parathyroid hormone (PTH) stimulating the parathyroid glands to release gastrin, a hormone that increases gastric acid secretion. Elevated gastrin levels can lead to increased gastric acid production, causing peptic ulcers, including pyloric channel ulcers. The patient's elevated serum calcium level is a clue to the underlying hyperparathyroidism.
**Why Each Wrong Option is Incorrect**
**Option A:** This option might be a distractor if it suggests a different cause of peptic ulcer disease, such as Helicobacter pylori infection or nonsteroidal anti-inflammatory drug (NSAID) use. However, the patient's lack of response to ranitidine and elevated serum calcium level point away from these causes.
**Option B:** This option might be tempting if it suggests a different type of peptic ulcer, such as a duodenal ulcer. However, the patient's presentation of a nonhealing pyloric channel ulcer and elevated serum calcium level is more suggestive of hyperparathyroidism.
**Option C:** This option might be a distractor if it suggests a different diagnosis, such as Zollinger-Ellison syndrome. However, the patient's presentation is more consistent with hyperparathyroidism, which can also lead to increased gastrin levels and peptic ulcers.
**Option D:** This option is incorrect as it suggests a different cause of peptic ulcer disease, such as a gastric outlet obstruction. However, the patient's presentation and elevated serum calcium level point to a different diagnosis.
**Clinical Pearl / High-Yield Fact**
Hyperparathyroidism can lead to peptic ulcer disease through increased gastrin levels, and elevated serum calcium levels can be a clue to the underlying diagnosis.
**Correct Answer: C. Hyperparathyroidism can cause peptic ulcers by increasing gastrin levels, which leads to increased gastric acid production.**