ILTHPI - Comparison of Medicament Containing Tetracycline, Metronidazole, Bismuth Versus Amoxicillin, Metronidazole, Clarithromycin

Overview

Helicobacter pylori (H. pylori) is a spiral shaped, microaerophilic, gram negative bacterium. The organism resides in the acid and mucous layer of the human gastric mucosa, adheres to and colonizes the mucosal surface of the stomach and the mucosal epithelium with gastric metaplasia of duodenal bulb. Many studies have shown that H. pylori is an important causal factor of chronic gastritis, peptic ulcer disease, gastric cancer and gastric lymphoma. Endoscopic examination is indicated to confirm the above diagnosis for patient with H. pylori infection. The eradication rate of standard triple therapy has fallen below 80% in many countries due to the worldwide increasing prevalence of antibiotic resistant strains. This is related to the special gastric milieu of H. pylori, which leads to a more difficult and complicated treatment for achieving a successful eradication rate than other bacteria. Several strategies have been proposed to increase the eradication rate in the first line therapy or as a rescue therapy. However, these rescue therapies will increase the side effects and costs of treatment, decrease the compliance of patients and increase the rate of worldwide antibiotic resistance steadily. The WHO has listed H. Pylori as one of 12 antibiotic-resistant bacteria that have the greatest threat to human health in Feb. 2017. Our previous studies suggested that the administration of single -dose therapeutic agents can achieve the eradication of H. pylori immediately while conducting the endoscopic examination. The eradication rate of intraluminal therapy for H. pylori infection (ILTHPI) is 53.7% (51/95), and control the intragastric pH above 4 prior to the ILTHPI can even reach a 72.0%(36/50) eradication rate of H. pylori. According to the recent Taiwan consensus for the treatment of H. pylori in 2017, the first line therapeutic regiment of H. pylori containing Amoxicillin, Clarithromycin, and Metronidazole if the rate of Clarithromycin resistance is below 15%, while the first line therapeutic regiment of H. pylori containing tetracycline, metronidazole, and bismuth subcitrate if the rate of Clarithromycin resistance is above 15%. We aimed to evaluate and compare the efficacy of medicament containing Tetracycline, Metronidazole, and Bismuth versus Amoxicillin, Metronidazole, and Clarithromycin for the Intraluminal therapy of Helicobacter pylori infection.

During the endoscopic examination, patient is sedated with intravenous Midazolam 5mg and Fentanyl 0.05mg, the vital signs will be closely monitored by physiological monitor (PHILIPS SureSigns VM6). The treatment will be terminated immediately if unstable vital sign detected or if patient asks for termination. The pH value of gastric juice will be measured with the pH test strips. and the he gastric mucus is irrigated with acetylcysteine solution. The investigators randomly assigned medicaments containing different antibiotic powders either Tetracycline 2g, Metronidazole 2g, and Bismuth 480mg (Group A) or Amoxicillin 3g, Metronidazole 2g, and Clarithromycin 1g (Group B) to dispense on the surface of gastric mucosa and duodenal mucosa of duodenal bulb. After the intraluminal therapy, patients will rest for 30 to 60 minutes and go home if the effect of sedation subsided. Patients can take meal if no abdominal discomfort. C13-Urea breath test (UBT) will be used to assess the existence of H. pylori 2 weeks after the intraluminal therapy. Patients failed to achieve intraluminal eradication of H. pylori will be assigned to 7-day concomitant therapy (Group A) or 7-day bismuth quadruple therapy (Group B). The C13-UBT will be used to assess the existence of H. pylori 4 weeks after the oral antibiotic therapy. The overall eradication rates of the intraluminal therapy plus the oral antibiotics therapies will be evaluated.