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Interpretation of the 13C-urea breath test in the choice of second- and third-line eradication of Helicobacter pylori infection

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Abstract

Background

The urea breath test (UBT) is one of the most accurate methods of assessing Helicobacter pylori status. The predictive value of the test is, however, uncertain. This study was a serial, prospective analysis of the change over time of UBT values after first-, second- and third-line treatments of patients with failed eradication therapy.

Methods

One hundred thirty-four duodenal ulcer patients with persisting H. pylori infection after first-line triple therapy were enrolled in a cross-over manner to receive either pantoprazole (40 mg twice daily), amoxicillin (1000 mg twice daily), and clarithromycin (500 mg) or ranitidine bismuth citrate (400 mg twice daily), metronidazole (250 mg twice daily), and clarithromycin (500 mg twice daily) for 7 days. Forty-one patients with failed second-line treatment were randomized to receive third-line quadruple therapies with pantoprazole + amoxicillin and tetracycline (500 mg four times daily) and either nitrofurantoin (100 mg three times daily) or bismuth subsalicylate (120 mg four times daily). Breath tests were performed 6 weeks after therapy. The δ13CO2 values (‰) after primary, secondary, and tertiary treatment were analyzed, and the correlation between pretreatment values and the rate of H. pylori eradication was assessed.

Results

In patients with successful second-line treatment, UBT values decreased from 12.4‰ [confidence interval (CI), 9.7–15.7)] to 2.8‰ (CI, 0.9–2.5) (P = 0.001), and in those with persistent infection, they increased from 13.2‰ (CI, 7.3–19.1) to 19.2‰ (CI, 13.4–25.0) (P = 0.03). After a failed quadruple regimen, UBT values increased from 19.3‰ (CI, 16.2–22.4) to 25.8‰ (CI, 19.8–312.8) (P = 0.03). The correlation between the pretreatment UBT values and the rate of eradication was negative for both second- and third-line therapies.

Conclusions

Serial assessment showed that UBT values after successive treatments showed a marked tendency to increase over time in failed cases. The significance of this phenomenon must be further studied. It might indicate increased colonization, ongoing resistance, or urease gene overexpression. Higher pretreatment UBT values were associated with lower (<60%) eradication rates. In these cases, alternative/rescue therapies should be chosen.

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Authors and Affiliations

  1. Gastroenterology, Ferencváros Health Center, 1095, Budapest, Mester utca 45, Hungary

    György M. Buzás & Ilona Széles

  2. Second District Policlinic, Central Laboratory, Budapest, Hungary

    György M. Buzás & Ilona Széles

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  1. György M. Buzás
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  2. Ilona Széles
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Buzás, G.M., Széles, I. Interpretation of the 13C-urea breath test in the choice of second- and third-line eradication of Helicobacter pylori infection. J Gastroenterol 43, 108–114 (2008). https://doi.org/10.1007/s00535-007-2135-8

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  • DOI: https://doi.org/10.1007/s00535-007-2135-8

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