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Comparison of the (13)C-urea breath test and the endoscopic phenol red mucosal pH test in the quantification of Helicobacter pylori infection loading

BACKGROUND/AIMS: The (13)C-urea breath test (UBT) is a semiquantitative test for measuring Helicobacter pylori infection loading. H. pylori produces ammonia, which elevates the pH of the gastric mucosa and is detectable via endoscopy using a phenol red indicator. We evaluated whether this test could...

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Detalles Bibliográficos
Autores principales: Cho, Young-Seok, Chae, Hiun-Suk, Jang, Se Na, Kim, Jin-Soo, Son, Hye Suk, Kim, Hyung-Keun, Kim, Byung-Wook, Han, Sok-Won, Choi, Kyu-Yong, Lee, Hae Kyung, Chang, Eun Deok
Formato: Texto
Lenguaje:English
Publicado: The Korean Association of Internal Medicine 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2686969/
https://www.ncbi.nlm.nih.gov/pubmed/18787366
http://dx.doi.org/10.3904/kjim.2008.23.3.134
Descripción
Sumario:BACKGROUND/AIMS: The (13)C-urea breath test (UBT) is a semiquantitative test for measuring Helicobacter pylori infection loading. H. pylori produces ammonia, which elevates the pH of the gastric mucosa and is detectable via endoscopy using a phenol red indicator. We evaluated whether this test could be used to diagnose H. pylori infection and whether phenol red staining was correlated with (13)C-UBT results. METHODS: One hundred and twenty-three patients participated. The UBT was performed after ingestion of a capsule containing urea. A change in (13)C-UBT >2‰ was selected as the cutoff value for diagnosing infection. After spraying evenly with a 0.1% phenol red solution, the pH of the gastric mucosal surface was measured using an antimony electrode through the biopsy channel. RESULTS: The pH of stained mucosa (6.9±0.4) was significantly higher than that of unstained mucosa (1.9±0.8; p<0.001), and the H. pylori detection rate confirmed via histology was higher in stained versus unstained mucosa (p<0.01). Extensive mucosal staining resulted in a higher detection rate (p<0.001). The UBT produced results were very similar to those obtained via histological detection in stained mucosa (p<0.001). The extent of staining, expressed as a staining score, was positively correlated with the change in (13)C-UBT (r=0.426, p<0.001). A significant correlation was also observed between the histologically determined H. pylori density and (13)C-UBT results (r=0.674, p<0.001). CONCLUSIONS: H. pylori infection elevates gastric mucosal surface pH, and endoscopic phenol red staining may be an alternative method for the diagnosis of H. pylori infection.