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Helicobacter pylori. One bacterium and a broad spectrum of human disease! An overview
F Pakodi1, O M Abdel-Salam, A Debreceni
1First Department of Medicine, Medical University of Pécs, Hungary.
Abstract:
Since the historical rediscovery of gastric spiral Helicobacter pylori in the gastric mucosa of patients with chronic gastritis by Warren and Marshall in 1983, peptic ulcer disease has been largely viewed as being of infectious aetiology. Indeed, there is a strong association between the presence of H. pylori and chronic active gastritis in histology. The bacterium can be isolated in not less than 70% of gastric and in over 90% of duodenal ulcer patients. Eradication of the organism has been associated with histologic improvement of gastritis, lower relapse rate and less risk of bleeding from duodenal ulcer. The bacterium possesses several virulence factors enabling it to survive the strong acid milieu inside the stomach and possibly damaging host tissues. The sequence of events by which the bacterium might cause gastric or duodenal ulcer is still not fully elucidated and Koch's postulates have never been fulfilled. In the majority of individuals, H. pylori infection is largely or entirely asymptomatic and there is no convincing data to suggest an increase in the prevalence of peptic ulcer disease among these subjects. An increasingly growing body of literature suggests an association between colonization by H. pylori in the stomach and a risk for developing gastric mucosa-associated lymphoid tissue (MALT), MALT lymphoma, gastric adenocarcinoma and even pancreatic adenocarcinoma. The bacterium has been implicated also in a number of extra-gastrointestinal disorders such as ischaemic heart disease, ischaemic cerebrovascular disease, atherosclerosis, and skin diseases such as rosacea, but a causal role for the bacterium is missing. Eradication of H. pylori thus seems to be a beneficial impact on human health. Various drug regimens are in use to eradicate H. pylori involving the administration of three or four drugs including bismuth compounds, metronidazole, clarithromycin, tetracyclines, amoxycillin, ranitidine, omeprazole for 1-2 weeks. The financial burden, side effects and emergence of drug resistant strains due to an increase in the use in antibiotics for H. pylori eradication therapy need further reconsideration.
Insights
Helicobacter pylori (H. pylori) infection is linked to peptic ulcers and certain cancers. Eradicating H. pylori offers health benefits, but treatment challenges like drug resistance require attention.
Area of Science:
- Gastroenterology
- Infectious Diseases
- Oncology
Background:
- Helicobacter pylori (H. pylori) discovered in 1983 is strongly associated with chronic active gastritis and peptic ulcer disease.
- H. pylori is found in over 70% of gastric and 90% of duodenal ulcer patients, with eradication improving outcomes.
- The bacterium's virulence factors aid survival in stomach acid, yet the exact ulcerogenesis mechanism remains unclear, and Koch's postulates are unfulfilled.
Purpose of the Study:
- To review the role of H. pylori in peptic ulcer disease and other gastrointestinal and extra-gastrointestinal disorders.
- To discuss the implications of H. pylori eradication on patient health.
- To examine current H. pylori eradication therapies, their challenges, and the emergence of drug resistance.
Main Methods:
- Literature review of studies on H. pylori infection, peptic ulcer disease, and associated conditions.
- Analysis of the association between H. pylori colonization and various diseases, including cancers and extra-gastrointestinal disorders.
- Evaluation of H. pylori eradication regimens, their efficacy, side effects, and the growing issue of antibiotic resistance.
Main Results:
- H. pylori infection is a major cause of peptic ulcer disease, with eradication leading to better gastritis healing and reduced ulcer relapse and bleeding.
- H. pylori is linked to gastric MALT lymphoma, gastric adenocarcinoma, and potentially pancreatic adenocarcinoma.
- Associations with extra-gastrointestinal conditions like ischemic heart disease and rosacea are noted, but causal roles are unproven.
Conclusions:
- H. pylori eradication is generally beneficial for human health, improving gastritis and reducing ulcer complications.
- While H. pylori is a significant factor in peptic ulcers and certain cancers, its role in extra-gastrointestinal diseases requires further investigation.
- Current multi-drug eradication therapies face challenges including cost, side effects, and increasing antibiotic resistance, necessitating careful consideration and further research.