A 48-year-old woman on chronic NSAID therapy presents with epigastric pain. A 35-year-old man with H. pylori infection presents with similar symptoms. Which feature best distinguishes NSAID-induced peptic ulcers from H. pylori-associated ulcers?

Question

Accepted Answer

D. NSAID ulcers are located predominantly on the anterior wall of the duodenum and lesser curve of the stomach, whereas H. pylori ulcers are typically on the posterior duodenal wall. ## Anatomical Distinction: NSAID vs. H. pylori Peptic Ulcers

### Location as the Primary Discriminator

**Key Point:** The anatomical site of ulceration is the most reliable and clinically useful feature that distinguishes NSAID-induced ulcers from H. pylori-associated ulcers.

### Comparison Table: NSAID vs. H. pylori Peptic Ulcers

| Feature | NSAID-Induced Ulcer | H. pylori-Associated Ulcer |
| --- | --- | --- |
| **Primary location** | Anterior duodenal wall, lesser curve of stomach | Posterior duodenal wall, greater curve of stomach |
| **Mechanism** | Direct mucosal injury + COX inhibition | Chronic inflammation + acid hypersecretion |
| **Associated gastritis** | Minimal or absent | Chronic active gastritis with intestinal metaplasia |
| **Acid secretion** | Normal or low | Often elevated (especially in duodenal ulcers) |
| **Prevalence** | More common in gastric ulcers | More common in duodenal ulcers |
| **Bleeding risk** | High (anterior wall erosion) | Moderate |
| **Perforation risk** | High (anterior wall perforation) | Moderate |
| **Recurrence after healing** | Low (if NSAID stopped) | High (if H. pylori not eradicated) |

### Anatomical Explanation

**High-Yield:** 
- **NSAID ulcers** on the **anterior duodenal wall** and **lesser curve** occur because these are the most exposed areas to direct NSAID contact and gastric acid.
- **H. pylori ulcers** on the **posterior duodenal wall** and **greater curve** occur because H. pylori colonizes the antrum and body, triggering acid-mediated ulceration in these regions.

### Clinical Implications

**Clinical Pearl:** The anatomical location has critical surgical implications:
- **Anterior duodenal ulcer perforation** → penetrates into the peritoneal cavity → acute peritonitis (classic presentation: sudden severe epigastric pain, board-like rigidity)
- **Posterior duodenal ulcer erosion** → erodes into the gastroduodenal artery → massive GI bleeding (often without preceding perforation symptoms)

### Why Location Matters

**Mnemonic: "APE" for NSAID ulcers** — **A**nterior wall, **P**erforation risk, **E**xposed to acid and drug.

**Mnemonic: "PGA" for H. pylori ulcers** — **P**osterior wall, **G**reater curve, **A**cid hypersecretion.

[cite:Robbins 10e Ch 17]

![Peptic Ulcer Disease diagram](https://mmcphlazjonnzmdysowq.supabase.co/storage/v1/object/public/blog-images/explanation/2980.webp)

Answer

A. NSAID ulcers are always multiple, whereas H. pylori ulcers are solitary

Answer

B. NSAID ulcers occur predominantly in the antrum, whereas H. pylori ulcers occur in the body and fundus

Answer

C. NSAID ulcers show acute inflammation, whereas H. pylori ulcers show chronic atrophic gastritis

A 48-year-old woman on chronic NSAID therapy presents with epigastric pain. A 35-year-old man with H. pylori infection presents with similar symptoms. Which feature best distinguishes NSAID-induced peptic ulcers from H. pylori-associated ulcers?

Explanation

Anatomical Distinction: NSAID vs. H. pylori Peptic Ulcers

Location as the Primary Discriminator

Comparison Table: NSAID vs. H. pylori Peptic Ulcers

Anatomical Explanation

Clinical Implications

Why Location Matters

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Feature	NSAID-Induced Ulcer	H. pylori-Associated Ulcer
Primary location	Anterior duodenal wall, lesser curve of stomach	Posterior duodenal wall, greater curve of stomach
Mechanism	Direct mucosal injury + COX inhibition	Chronic inflammation + acid hypersecretion
Associated gastritis	Minimal or absent	Chronic active gastritis with intestinal metaplasia
Acid secretion	Normal or low	Often elevated (especially in duodenal ulcers)
Prevalence	More common in gastric ulcers	More common in duodenal ulcers
Bleeding risk	High (anterior wall erosion)	Moderate
Perforation risk	High (anterior wall perforation)	Moderate
Recurrence after healing	Low (if NSAID stopped)	High (if H. pylori not eradicated)