title: High efficacy of 14-day triple therapy-based, bismuth-containing quadruple therapy for initial Helicobacter pylori eradication.
abstract: BACKGROUND
  The success rate of currently recommended 7-day triple therapy with a PPI plus amoxicillin and clarithromycin has fallen into the unacceptable range. It is urgent to look for a new strategy to treat the infection of Helicobacter pylori.
  
  
  OBJECTIVE
  To observe the efficacy of triple therapy-based, bismuth-containing quadruple therapy for H. pylori treatment.
  
  
  METHODS
  A total of 160 patients with functional dyspepsia who were Hp+ were randomly assigned into two groups. Regimen: Omeprazole 20 mg, Amoxicillin 1.0 g, Clarithromycin 500 mg and Bismuth Potassium Citrate 220 mg, twice a day. Eighty patients received 7-day quadruple therapy and 80 patients received the same therapy for 14 days. Six weeks after treatment, H. pylori eradication was assessed by (13)C-urea breath test. Minimal inhibitory concentrations of metronidazole, clarithromycin and amoxicillin of clinical isolates were determined by the twofold agar dilution method.
  
  
  RESULTS
  Fourteen-day therapy led to a significant increase of H. pylori eradication success when compared to 7-day therapy in the intention-to-treat analysis (93.7 vs 80.0%; p = .01), and the per-protocol analysis (97.4 vs 82.0%; p = .0016). The H. pylori resistance rates to metronidazole, clarithromycin and amoxicillin were 42.1, 18.0 and 0%. Fourteen-day therapy was significantly more effective in patients with clarithromycin-resistant strains. Incidences of adverse events were comparable.
  
  
  CONCLUSIONS
  Addition bismuth and prolonging treatment duration can overcome H. pylori resistance to clarithromycin and decrease the bacterial load. Fourteen-day triple therapy-based, bismuth-containing quadruple therapy achieved ITT success rate 93% and could be recommended as the first line eradication regimen.
authors.affiliation: Department of Gastroenterology, Shanghai Renji Hospital, Shanghai Institute of Digestive Disease, Shanghai Jiaotong University School of Medicine, China.
authors.forename: Qinjuan
authors.initials: Q
authors.lastname: Sun
authors.forename: Xiao
authors.initials: X
authors.lastname: Liang
authors.forename: Qing
authors.initials: Q
authors.lastname: Zheng
authors.forename: Wenzhong
authors.initials: W
authors.lastname: Liu
authors.forename: Shudong
authors.initials: S
authors.lastname: Xiao
authors.forename: Weiqi
authors.initials: W
authors.lastname: Gu
authors.forename: Hong
authors.initials: H
authors.lastname: Lu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000658:Amoxicillin / Q000008:administration & dosage* / Q000494:pharmacology; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000494:pharmacology; D017291:Clarithromycin / Q000008:administration & dosage* / Q000494:pharmacology; D015169:Colony Count, Microbial; D004359:Drug Therapy, Combination; D005260:Female; D016481:Helicobacter Infections / Q000188:drug therapy*; D016480:Helicobacter pylori / Q000187:drug effects / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D008826:Microbial Sensitivity Tests; D008875:Middle Aged; D009853:Omeprazole / Q000008:administration & dosage* / Q000494:pharmacology; D009942:Organometallic Compounds / Q000008:administration & dosage* / Q000494:pharmacology; D054328:Proton Pump Inhibitors / Q000008:administration & dosage*; D013997:Time Factors; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D000900:Anti-Bacterial Agents; D009942:Organometallic Compounds; D054328:Proton Pump Inhibitors; D000658:Amoxicillin; D017291:Clarithromycin; C002791:bismuth tripotassium dicitrate; D009853:Omeprazole