24
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      VALIDATION OF 14C-UREA BREATH TEST FOR DIAGNOSIS OF Helicobacter pylori Translated title: Validação do teste expiratório com 14C-uréia para o diagnóstico do Helicobacter pylori

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          The aim of this study was to validate the 14C-urea breath test for use in diagnosis of Helicobacter pylori infection. Thirty H. pylori positive patients, based on histologic test and thirty H. pylori negative patients by histology and anti-H. pylori IgG entered the study. Fasting patients drank 5 uCi of 14C-urea in 20 ml of water. Breath samples were collected at 0, 5, 10, 15, 20 and 30 min. The difference of cpm values between the two groups was significant at all the time intervals, besides time 0 (p<0.0001). At 20 min, the test gave 100% sensitivity and specificity with a cut-off value of 562 cpm. Females were higher expirers than males (p=0.005). 14C-urea breath test is highly accurate for Helicobacter pylori diagnosis. It is fast, simple and should be the non-invasive test used after treating Helicobacter pylori infection.

          Translated abstract

          O teste expiratório com 14C-uréia diagnostica infecção pelo Helicobacter pylori no estômago. A urease, produzida por esta bactéria, quebra a 14C-uréia, resultando em HCO3- e NH4+, sendo expirado 14CO2 pelos pulmões e quantificado, então, por contador Beta. O objetivo do nosso estudo foi validar o teste expiratório com 14C-uréia, determinando o tempo ideal de coleta da amostra e o valor de corte. Foi definido o tempo de 20 min para coleta do exame após a ingestão de 5 uCi de 14C-uréia com valor de corte de 562 cpm. A sensibilidade e a especificidade do teste foram de 100% aos 20 min. As diferenças de contagens entre os grupos Helicobacter pylori negativos e Helicobacter pylori positivos foram estatisticamente significativas (p<0,0001). As pacientes do sexo feminino, aos 20 min apresentaram contagens superiores às dos pacientes do sexo masculino (p=0,005). É preciso verificar se as mulheres têm maior densidade bacteriana, ou se é pelo fato dos homens expirarem mais CO2, diluindo a amostra. O teste expiratório com 14C-uréia é método diagnóstico não invasivo, muito sensível, específico e barato.

          Related collections

          Most cited references38

          • Record: found
          • Abstract: not found
          • Article: not found

          CAMPYLOBACTER PYLORI DETECTED NONINVASIVELY BY THE 13C-UREA BREATH TEST

            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Advantages and disadvantages of current diagnostic tests for the detection of Helicobacter pylori.

            Current tests used to detect Helicobacter pylori are either invasive (histological detection, culture, the polymerase chain reaction (PCR), smear examination) or non-invasive (serology, 13C-urea breath test). These tests vary in their sensitivity and specificity, and the choice of test will depend on the situation, for example, whether the test is to detect infection or the success of eradication treatment. The accuracy of histological tests depends, to a large degree, on the expertise of the pathologist, while the accuracy of culture can depend on the conditions in which the specimen is transported and processed. When performed under optimal conditions, both techniques give very good results. The PCR test has similar sensitivity and specificity to histological and culture tests but a strict protocol must be followed to avoid contamination with H. pylori DNA. The rapid urease test (with a reading taken 1 hour later) is suitable for diagnosis before treatment but its sensitivity decreases after treatment. Smear examination has limited sensitivity. The urea breath test and serology (specific IgG detected by enzyme-linked immunosorbent assay with purified antigens) have sensitivities close to those using the best of the biopsy methods. Other points to consider when selecting a test are its availability, the rapidity of the results (which can range from a few minutes to 2 weeks), possibilities for retrospective analysis, quantification and the detection of pathogenic properties, the globality of certain tests that present an overall picture of the stomach, thus avoiding errors in sampling, and the cost of the test. Important added value can be gained from certain tests: histology allows evaluation of the status of the mucosa, culture allows strain typing and tests for antibiotic susceptibility, and the breath test can confirm successful eradication without endoscopy. When the diagnostic tests are performed correctly, most of them are highly accurate.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Drug therapy for Helicobacter pylori infection: problems and pitfalls.

              Antibacterial chemotherapy against Helicobacter pylori is currently being assessed by open or randomized controlled clinical studies for its efficacy in eradicating this bacterium from the stomach of patients with gastritis or gastroduodenal ulcer. Whereas there is presently no "optimal" agent and treatment scheme, the combination of some antibiotics (metronidazole, tinidazole, amoxicillin) with bismuth salts proves definitely superior in vivo to either of these agents administered alone. Several reasons have been proposed, to explain the clinical failure after treatment: insufficient concentration of active drugs in gastric mucus, instability of some agents at an acidic pH, inappropriate formulation of drug, insufficient duration of treatment, and variable compliance of patients. Recently, it has appeared from several clinical trials that H. pylori may rapidly acquire resistance to some antibiotics, and that this event might also account for clinical failure. A critical review of the literature on H. pylori treatment indicates that association of bismuth and antibiotics or of antibiotics alone both may efficiently reduce the risk of emergence of resistance and improve the therapeutic outcome. Guidelines of treatment are suggested in order to avoid the future misuse of antibiotics that would increase selection of antibiotic-resistant H. pylori and negatively affect the ecology of the gastric microflora. Likewise, an accurate definition of a subset of patients with H. pylori who really will require treatment needs to be rapidly established.
                Bookmark

                Author and article information

                Journal
                rimtsp
                Revista do Instituto de Medicina Tropical de São Paulo
                Rev. Inst. Med. trop. S. Paulo
                Instituto de Medicina Tropical (São Paulo, SP, Brazil )
                1678-9946
                January 1999
                : 41
                : 1
                : 3-7
                Affiliations
                [01] São Paulo orgnameUniversity of São Paulo orgdiv1 Laboratory of Functional Tests of the Digestive System, Department of Gastroenterology, Hospital of Clinics Brazil
                Article
                S0036-46651999000100002 S0036-4665(99)04100102
                10.1590/S0036-46651999000100002
                4337af8b-bdaf-426d-a484-e86ad2201842

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 09 November 1998
                : 31 July 1998
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 22, Pages: 5
                Product

                SciELO Brazil

                Categories
                Microbiology

                Microbiology & Virology
                14C urea breath test,Helicobacter pylori diagnosis
                Microbiology & Virology
                14C urea breath test, Helicobacter pylori diagnosis

                Comments

                Comment on this article

                scite_
                0
                0
                0
                0
                Smart Citations
                0
                0
                0
                0
                Citing PublicationsSupportingMentioningContrasting
                View Citations

                See how this article has been cited at scite.ai

                scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.

                Similar content588

                Cited by5

                Most referenced authors208