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Proton pump inhibitors (PPIs) are mainly metabolized in the liver by CYP2C19, one of the cytochrome P450 isoenzymes, which shows a genetic polymorphism associated with enzyme activities. The most essential role of a PPI in H. pylori eradication therapy is to make antibiotics more stable and bioavailable in the stomach by raising intragastric pH to neutral levels.
Most patients who have failed in the eradication of H. pylori infection by triple therapy with a PPI, amoxicillin (AMPC) and clarithromycin (CAM) at standard doses have extensive metabolizer (EM) genotypes of CYP2C19 and/or are infected with CAM-resistant strains of H. pylori.
Four-times daily dosing of a PPI could achieve complete gastric acid inhibition. Dual therapy with 4-times daily dosing of a PPI and AMPC could yield sufficient re-eradication rates in patients with EM genotype of CYP2C19.
Metronidazole (MNZ)-based re-eradication therapy, such as triple PPI/AMPC/MNZ therapy, also achieved high eradication rates and has been recommended as the second line therapy in Japan. But carcinogenic actions of MNZ have been unclear.
The purpose of this study is to compare the re-eradication rates of H. pylori infection by the dual high-dose PPI/AMPC therapy and triple PPI/AMPC/MNZ therapy, and to validate the efficacies of these re-eradication regimens as second line eradication therapies.
Allocation: Randomized, Control: Uncontrolled, Endpoint Classification: Efficacy Study, Intervention Model: Factorial Assignment, Masking: Open Label, Primary Purpose: Treatment
rabeprazole, amoxicillin, clarithromycin, metronidazole
Hamamatsu University School of Medicine
Published on BioPortfolio: 2014-07-23T21:48:10-0400
More than half of the world's population is infected with Helicobacter pylori, a bacterium that colonizes the human stomach. Although most infected subjects live free of symptoms and dise...
Helicobacter pylori (H. pylori), which infects about 50% of the global population, has been recognized as a main risk factor of multiple gastric pathologies, especially non-cardiac gastric...
Helicobacter pylori is a bacteria that infects the lining of the stomach and is associated with ulcers. Helicobacter pylori may also increase the long-term risk of developing certain forms...
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To determine the prevalence of resistance to metronidazole, clarithromycin, levofloxacin, amoxicillin, and furazolidone in Helicobacter pylori isolated from Chinese children.
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A fixed-ratio combination of amoxicillin trihydrate (see AMOXICILLIN), an aminopenicillin, and potassium clavulanate (see CLAVULANIC ACID), a beta-lactamase inhibitor, used to treat a broad-spectrum of bacterial infections, especially resistant strains.
Infections with organisms of the genus HELICOBACTER, particularly, in humans, HELICOBACTER PYLORI. The clinical manifestations are focused in the stomach, usually the gastric mucosa and antrum, and the upper duodenum. This infection plays a major role in the pathogenesis of type B gastritis and peptic ulcer disease.
A nitroimidazole used to treat AMEBIASIS; VAGINITIS; TRICHOMONAS INFECTIONS; GIARDIASIS; ANAEROBIC BACTERIA; and TREPONEMAL INFECTIONS. It has also been proposed as a radiation sensitizer for hypoxic cells. According to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985, p133), this substance may reasonably be anticipated to be a carcinogen (Merck, 11th ed).
A species of HELICOBACTER commonly associated with STOMACH DISEASES in FERRETS.
A spiral bacterium active as a human gastric pathogen. It is a gram-negative, urease-positive, curved or slightly spiral organism initially isolated in 1982 from patients with lesions of gastritis or peptic ulcers in Western Australia. Helicobacter pylori was originally classified in the genus CAMPYLOBACTER, but RNA sequencing, cellular fatty acid profiles, growth patterns, and other taxonomic characteristics indicate that the micro-organism should be included in the genus HELICOBACTER. It has been officially transferred to Helicobacter gen. nov. (see Int J Syst Bacteriol 1989 Oct;39(4):297-405).
Hepatology is the study of liver, gallbladder, biliary tree, and pancreas, and diseases associated with them. This includes viral hepatitis, alcohol damage, cirrhosis and cancer. As modern lifestyles change, with alcoholism and cancer becoming more promi...
Enzymes are proteins that catalyze (i.e., increase the rates of) chemical reactions. In enzymatic reactions, the molecules at the beginning of the process, called substrates, are converted into different molecules, called products. Almost all chemical re...
Peptic Ulcer Disease
Peptic Ulcer Disease - stomach ulcer, duodenal ulcers used to refer to all types of peptic ulcers. A peptic ulcer is an erosion in a segment of the Gastrointestinal (GI) muscularis mucosae, typically in the stomach (gastric ulcer) or the first few cent...