Evolve Homework 2_24

Peptic Ulcer Disease (PUD)

  • Definition: PUD is a condition characterized by erosion of the gastrointestinal (GI) mucosa caused by the digestive effects of hydrochloric acid (HCl) and pepsin.

  • Prevalence: Affects approximately 4.6 million individuals in the United States annually.

  • Location: Ulcers can form in any GI tract segment that contacts stomach secretions, including:

    • Lower esophagus

    • Stomach

    • Duodenum

    • Margin of a gastrojejunal anastomosis

Classifications of Peptic Ulcers

  • Acute Peptic Ulcer:

    • Characteristics: Causes superficial erosion with minimal inflammation.

    • Duration: Short-lived; resolves quickly once the cause is identified and eliminated.

  • Chronic Peptic Ulcer:

    • Characteristics: Longer duration, may be present continuously or intermittently for months.

    • Severity: Erodes through the muscular wall and creates fibrous tissue.

    • Frequency: More common than acute ulcers.

Gastric versus Duodenal Ulcers

  • Comparative Characteristics: Gastric ulcers differ from duodenal ulcers in incidence, symptoms, and complications.

    • Gastric Ulcers:

      • Location: Typically found in the antrum of the stomach and may also occur in the body and fundus.

      • Secretion Levels: Normal to decreased gastric secretions.

      • Incidence: More prevalent in women, especially postmenopausal.

      • Peak Age: 50-60 years.

      • Peripheral Health Risks: Associated with higher cancer risk; often linked with other diseases (e.g., COPD, renal failure).

      • Pain: Occurs 1-2 hours after meals; often aggravated by food.

    • Duodenal Ulcers:

      • Location: Primarily the first 1-2 cm of the duodenum.

      • Secretion Levels: Increased secretion typically evident.

      • Incidence: More common in men, incidence increasing in women.

      • Peak Age: 35-45 years.

      • Health Risks: Similar associations with H. pylori and other diseases, but does not raise cancer risk.

      • Pain: Commonly arises 2-5 hours after meals and may also awaken patients at night; episodic.

Pathophysiology of Peptic Ulcer Development

  • Acid Environment:While an excess of HCl is not necessary for ulcer development, pepsinogen converts to pepsin in the presence of HCl (pH 2-3).

  • Mucosal Barrier Damage:

    • Back diffusion of HCl into the gastric mucosa leads to inflammation and destruction.

    • Histamine release from damaged mucosa increases capillary permeability and acid secretion.

Risk Factors for Peptic Ulcer Development

  1. Helicobacter pylori Infection: Major risk factor; accounts for:

    • 80% of gastric ulcers

    • 90% of duodenal ulcers

    • Transmission mainly occurs during childhood.

    • Higher risk noted in certain ethnic groups.

  2. Medication-Induced Injury:

    • NSAIDs and corticosteroids can increase ulcer risk.

    • NSAIDs impair mucosal integrity; combination with H. pylori exacerbates risks.

Clinical Manifestations of Gastric and Duodenal Ulcers

  • Symptoms:

    • Gastric ulcer pain is often burning or gaseous, higher in the epigastrium, occurs shortly after meals.

    • Duodenal ulcer pain is cramping and pressure-like, typically experienced 2-5 hours after eating.

    • Back pain may be associated with posterior ulcers.

  • Diagnosis: Tools include endoscopy and imaging techniques to confirm ulcers, and assess for complications like bleeding and perforations.

Complications of Chronic Peptic Ulcer Disease

  1. GI Bleeding: Most prevalent complication, particularly from duodenal ulcers.

  2. Perforation: Life-threatening; leads to peritonitis.

  3. Gastric Outlet Obstruction: Results from scarring and edema around ulcers.