A peptic ulcer is a sore or lesion that develops on the lining of the stomach, upper small intestine (duodenum), or esophagus due to the erosion of the mucosal barrier by acidic gastric juices. The term encompasses gastric ulcers (in the stomach) and duodenal ulcers (in the duodenum). Rarely, ulcers can occur in the esophagus, known as esophageal ulcers.
Types of Peptic Ulcer
1. Gastric Ulcers: Develop on the inner lining of the stomach. Often associated with pain exacerbated by eating.
2. Duodenal Ulcers: Occur on the upper part of the small intestine (duodenum). Pain usually improves after eating but worsens several hours later.
3. Esophageal Ulcers: Occur in the esophagus. Commonly associated with gastroesophageal reflux disease (GERD).
4. Stress Ulcers: Result from severe physiological stress, such as major surgeries or critical illness. Common in ICU patients.
Causes of Peptic Ulcer
Peptic ulcers occur when there is an imbalance between the protective factors of the gastrointestinal mucosa and aggressive factors such as acid and pepsin.
1. Helicobacter pylori (H. pylori) Infection: A bacterium that weakens the mucosal layer, making it susceptible to acid damage. Found in approximately 70-90% of duodenal ulcers and 60% of gastric ulcers.
2. NSAIDs (Non-Steroidal Anti-Inflammatory Drugs): Long-term use of NSAIDs such as aspirin, ibuprofen, or naproxen can inhibit prostaglandin synthesis, reducing mucosal protection.
3. Lifestyle Factors
Smoking: Increases gastric acid secretion.
Alcohol: Irritates the gastric lining.
Dietary habits: Spicy foods and caffeine may aggravate symptoms.
4. Zollinger-Ellison Syndrome (ZES): A rare condition characterized by tumors (gastrinomas) that excessively secrete gastrin, leading to increased acid production.
5. Stress: Emotional and physical stress can exacerbate the condition but is not a primary cause.
6. Other Factors Genetic predisposition. Chronic diseases like chronic obstructive pulmonary disease (COPD) or chronic renal failure.
Pathophysiology of Peptic Ulcer
1. Mucosal Barrier Disruption: The gastric mucosa is protected by a barrier composed of mucus and bicarbonate. When this barrier is compromised (e.g., by H. pylori, NSAIDs, or stress), gastric acid and pepsin penetrate the mucosa.
2. Inflammatory Response: Damage to the epithelial cells triggers inflammation, leading to further mucosal injury.
3. Acid and Pepsin Activity: Acid secretion increases, and pepsinogen converts to pepsin, which accelerates mucosal erosion and ulceration.
4. Ulceration and Healing Imbalance: A failure in the repair mechanisms due to ongoing injury leads to chronic ulcers.
Symptoms of Peptic Ulcer
1. Burning or Gnawing Epigastric Pain:
One of the most characteristic symptoms of a peptic ulcer is a persistent, burning, or gnawing pain located in the upper central part of the abdomen (epigastric region). This pain often feels like a dull ache or a sharp discomfort and may be described as a sensation of hunger or cramping that is not relieved by food in some cases, while in others, food may temporarily soothe it.
2. Pain Timing and Relation to Meals:
- Gastric Ulcer: The pain typically becomes worse shortly after eating—often within 30 minutes. This is because the stomach begins to secrete acid in response to food intake, which irritates the ulcerated gastric lining.
- Duodenal Ulcer: In contrast, pain associated with duodenal ulcers usually improves shortly after eating, as the food buffers stomach acid. However, it tends to recur approximately 2–3 hours after meals or during the night, often waking the patient from sleep.
3. Nausea and Vomiting:
Individuals may experience a persistent feeling of nausea or queasiness, and in some cases, may vomit due to the irritation of the stomach lining or obstruction caused by inflammation or scarring.
4. Abdominal Bloating and Early Satiety:
Patients often report a sensation of fullness or bloating after consuming only a small amount of food. This early satiety may be due to gastric outlet obstruction or impaired gastric motility associated with chronic ulcers.
5. Melena (Black, Tarry Stools):
Dark, tarry stools are a sign of gastrointestinal bleeding and occur when blood from an ulcer is digested as it passes through the intestines. This symptom indicates upper gastrointestinal bleeding and requires prompt medical attention.
6. Hematemesis (Vomiting Blood):
In more severe cases, an ulcer may erode into a blood vessel, leading to the vomiting of blood. The vomitus may appear bright red or have the appearance of coffee grounds due to partial digestion. This is a medical emergency and signifies significant gastrointestinal hemorrhage.
7. Unintended Weight Loss:
Chronic discomfort and pain associated with eating may lead individuals to avoid meals, resulting in a noticeable and unintentional loss of body weight over time. This can further exacerbate nutritional deficiencies.
8. Fatigue and Weakness:
Ongoing blood loss from the ulcer can lead to iron deficiency anemia, characterized by fatigue, weakness, pallor, and shortness of breath. This symptom is often gradual and may go unnoticed until anemia becomes more pronounced.
Treatment of Peptic Ulcer
Management of peptic ulcer disease (PUD) primarily aims to relieve symptoms, promote ulcer healing, eradicate Helicobacter pylori infection (if present), prevent recurrence, and manage complications. The treatment can be broadly categorized into medical and surgical approaches.
1. Medical Management
This is the first-line and most widely adopted approach for the majority of patients with peptic ulcers.
a. Proton Pump Inhibitors (PPIs): PPIs are considered the cornerstone of peptic ulcer therapy due to their potent and prolonged suppression of gastric acid secretion. They work by irreversibly inhibiting the H⁺/K⁺ ATPase enzyme system (proton pump) located on the parietal cells of the stomach lining.
- Mechanism: Decrease gastric acidity, thus promoting ulcer healing and reducing pain.
- Common Agents:
- Omeprazole
- Pantoprazole
- Esomeprazole
- Rabeprazole
- Lansoprazole
b. H2 Receptor Antagonists: These agents reduce acid production by competitively blocking histamine H2 receptors on gastric parietal cells.
- Indications: Often used when PPIs are not tolerated or as adjuncts.
- Examples:
- Ranitidine (withdrawn in some markets due to safety concerns)
- Famotidine
- Nizatidine
c. Antacids: These are fast-acting agents that provide symptomatic relief by neutralizing existing gastric acid.
- Examples:
- Aluminum hydroxide
- Magnesium hydroxide
- Calcium carbonate
- Note: Long-term use is not ideal due to potential side effects like constipation (aluminum) or diarrhea (magnesium).
d. Mucosal Protectants: These agents enhance the defensive mechanisms of the gastric mucosa.
- Sucralfate: Binds to ulcer bases, forming a protective physical barrier against acid and pepsin.
- Misoprostol: A prostaglandin E1 analog that increases mucus and bicarbonate secretion, improves mucosal blood flow, and reduces acid secretion.
- Particularly useful for NSAID-induced ulcers.
e. Antibiotic Therapy for Helicobacter pylori Eradication: H. pylori infection is a major cause of peptic ulcer disease. Eradication is critical to prevent recurrence.
- Standard Triple Therapy (7–14 days):
- Clarithromycin + Amoxicillin (or Metronidazole) + a PPI
- Bismuth-Based Quadruple Therapy:
- Bismuth subsalicylate + Tetracycline + Metronidazole + PPI
- Used in resistant cases or where triple therapy fails.
f. Prokinetic Agents: These medications are helpful in patients with delayed gastric emptying or gastroparesis, which may exacerbate ulcer symptoms.
- Examples:
- Metoclopramide
- Domperidone
2. Surgical Management: Surgical intervention is considered only when medical therapy fails or when complications arise, such as bleeding, perforation, or gastric outlet obstruction.
a. Vagotomy: Surgical severing of the vagus nerve branches that stimulate acid production.
- Types:
- Truncal vagotomy
- Selective vagotomy
- Highly selective vagotomy
- Often combined with drainage procedures like pyloroplasty.
b. Partial Gastrectomy: Involves resecting the affected part of the stomach, particularly when the ulcer is unresponsive to medical treatment or has malignant potential.
- Examples: Billroth I and Billroth II procedures.
c. Pyloroplasty: A surgical procedure to widen the pyloric canal, facilitating gastric emptying and relieving obstruction symptoms. Often done in conjunction with vagotomy.
3. Lifestyle Modifications
Avoid smoking, alcohol, and NSAIDs.
Eat small, frequent meals and avoid irritating foods.
Manage stress through relaxation techniques or counseling.
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