**Question:** Red velvety appearance of stomach mucosa is seen in the poisoning of

A. Alcohol
B. Cholesterol
C. NSAIDs
D. NSAIDs and alcohol

**Correct Answer:** C. NSAIDs

**Core Concept:**
The red velvety appearance of the stomach mucosa is a clinical sign known as mucosal congestion. This occurs due to increased blood flow and vascular permeability in the mucosa as a result of various factors. In this case, it is seen in the setting of NSAIDs (Nonsteroidal Anti-Inflammatory Drugs) toxicity.

**Why the Correct Answer is Right:**
NSAIDs, such as aspirin and ibuprofen, are commonly prescribed drugs for pain relief, fever, and inflammation. However, their use can lead to gastric mucosal injury due to a combination of factors:

1. Inhibition of prostaglandin synthesis: NSAIDs block the enzyme cyclooxygenase (COX), which is essential for the production of prostaglandins. Prostaglandins play a crucial role in protecting the stomach lining from injury by maintaining mucus production, reducing vascular permeability, and promoting gastric motility.
2. Increased gastric secretion: NSAIDs can cause an increase in gastric acid secretion, contributing to mucosal damage.
3. Direct cytotoxic effect: Some NSAIDs have a direct cytotoxic effect on the gastric mucosa.

**Why Each Wrong Option is Incorrect:**

A. Alcohol: Although alcohol can cause gastritis (inflammation of the stomach lining), it is not directly responsible for the red velvety appearance of the mucosa. Alcohol-induced gastritis is typically characterized by redness and edema, not the velvety appearance seen in NSAIDs-induced mucosal injury.

B. Cholesterol: Cholesterol does not directly cause mucosal damage to the stomach lining. Cholesterol is an essential component of cell membranes and has no direct impact on the gastric mucosa.

Combining alcohol with NSAIDs can exacerbate the mucosal damage, resulting in a more severe form of gastritis, but the correct answer is still NSAIDs.

D. NSAIDs and alcohol: As explained above, while alcohol can worsen NSAIDs-induced gastritis, it is not responsible for the red velvety appearance. The correct answer remains NSAIDs.

**Clinical Pearl:**
In clinical practice, it is essential to understand the mechanism of action and effects of various medications (like NSAIDs and alcohol) on the gastrointestinal tract, particularly the stomach. Properly assessing, diagnosing, and managing these adverse effects can improve patient outcomes and prevent complications like gastrointestinal bleeding and perforation.