General Characteristics and Epidemiology
Normally, the gastrointestinal tract wall functions as a reliable mechanical, physicochemical, and immunogenic barrier. It prevents intestinal microflora, bacterial toxins, and toxic products of food digestion from entering the systemic circulation. When this function is impaired, digestive disorders, toxinemia, and systemic infection develop.
Among all pathologies of the digestive system, peptic ulcer disease occupies a prominent place alongside irritable bowel syndrome, malabsorption syndrome, and colitis (chronic and ulcerative). The global detection rate of this disease is steadily increasing.
Key Statistical Facts:
- Age and Sex: The peak incidence occurs in individuals aged 40–60. In the age group under 50, men are noticeably more affected than women.
- Localization: Duodenal mucosal lesions predominate over gastric lesions at a 3:1 ratio, and among younger patients, this gap reaches 10:1.
- Urbanization: City residents are more susceptible to the disease than rural populations.
The pathology is dangerous due to its life-threatening complications: gastrointestinal bleeding occurs in 20–25% of patients, and organ wall perforation with subsequent peritonitis is also possible.
Infectious Factor (Helicobacter pylori)
The role of Helicobacter pylori in the formation of recurrent mucosal defects is well-established. The population infection rate is high: even in preschool children (ages 5–7), it is 40–50%. However, it is worth noting that the bacterium is frequently found in healthy individuals without clinical symptoms.
This microorganism specifically damages the epithelium and destroys the protective mucus-bicarbonate layer. Aggressive mechanisms include:
- Secretion of hydrolytic enzymes (phospholipases, urease, proteases).
- Production of membranotropic and vacuolating cytotoxins.
- Activation of the inflammatory cascade via stimulation of mediators such as tumor necrosis factor alpha (TNF-$\alpha$), various interleukins, and lysosomal hydrolases.
Social and Dietary Factors
Lifestyle, bad habits, and dietary patterns directly affect the secretory and motor functions of the digestive tract.
Social Triggers:
- Chronic Stress: High professional workloads and mental exhaustion create a focus of diffuse, stagnant excitation in the hypothalamic nuclei. This enhances the tonic influence of the vagus nerve (n. vagus), which pathologically stimulates motility and secretion.
- Smoking: Nicotine not only promotes pepsinogen hypersecretion but also suppresses the production of protective bicarbonates. Furthermore, it accelerates the evacuation of low-pH acidic contents into the duodenum.
- Alcohol Consumption: Ethanol destroys the mucus-bicarbonate barrier, exerts a direct irritant effect on tissues, and stimulates excessive gastric secretion.
Dietary Factors: Improper nutrition increases the peptic activity of gastric juice. Regular consumption of large amounts of meat stimulates excessive acid production. Refined foods have a low buffering capacity, meaning they cannot effectively neutralize hydrochloric acid. Finally, irregular meal times result in the secretion of aggressive gastric juice in the absence of food substrate, damaging the body's own tissues.
Hereditary and Iatrogenic (Drug-Induced) Factors
Genetic predisposition plays an important role in etiology. If close relatives have suffered from this disease, the risk of developing it increases 10-fold. It is also proven that individuals with blood type O (I) have a 30–40% higher probability of developing a duodenal ulcer. Additionally, the pathology is associated with certain HLA haplotypes (B5, B12, Bw35).
Drug-induced factors are linked to medications that create an imbalance by suppressing the mucosal defense mechanisms:
- Nonsteroidal Anti-Inflammatory Drugs (NSAIDs): Medications such as acetylsalicylic acid inhibit the enzyme cyclooxygenase (COX), thereby blocking the production of protective prostaglandins.
- Corticosteroids: Glucocorticoids and mineralocorticoids inhibit gastric epithelial regeneration and significantly reduce mucus secretion.