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Detection of Helicobacter pylori DNA by a Simple Stool PCR Method in Adult Dyspeptic Patients
Author(s) -
Şen Nazime,
Yilmaz Özlem,
Şımşek İlkay,
Küpelıoğlu Ahmet Ali,
Ellıdokuz Hülya
Publication year - 2005
Publication title -
helicobacter
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.206
H-Index - 79
eISSN - 1523-5378
pISSN - 1083-4389
DOI - 10.1111/j.1523-5378.2005.00326.x
Subject(s) - gold standard (test) , gastroenterology , helicobacter pylori , medicine , polymerase chain reaction , peptic , ethidium bromide , dna extraction , agarose gel electrophoresis , urea breath test , negativity effect , real time polymerase chain reaction , gastritis , biology , helicobacter pylori infection , gene , peptic ulcer , dna , biochemistry , genetics , social psychology , psychology
. Helicobacter pylori is the major agent causing peptic ulcer, gastric cancer and mucosa‐associated lymphoid tissue (MALT) gastric lymphoma. A simple stool polymerase chain reaction (PCR) method was performed and compared with the gold standards for the diagnosis of H. pylori infection. Material and methods. A total of 54 adult patients (mean age, 46.41 ± 13.12 years) with dyspeptic symptoms from Gastroenterology at Dokuz Eylül University Hospital between May and November 2003 were included. Two antrum and corpus biopsies were taken from each patient. Infection by H. pylori was defined as positivity and negativity of the gold standards. DNA extraction of stool specimens was done using QIAamp DNA Stool Mini Kit (QIAGEN) and PCR conditions included amplification and reamplification steps using the H. pylori ureA gene specific primers (HPU1, HPU2) and were visualized on 1% agarose gel stained with ethidium bromide. Results. Forty‐six of 54 patients (85.2%) were diagnosed positive and eight (14.8%) were negative for H. pylori infection by the gold standard methods. Thirty‐two patients were positive (59.3%) and 22 of them (40.7%) were detected negative by stool PCR method. The stool PCR method and gold standard methods showed a statistical difference for the detection of H. pylori infection ( p < .0001). Sensitivity, specificity, likelihood ratio, and positive and negative predictive values were 65.22%, 75%, 2.61%, 93.75%, and 27.7%, respectively. Discussion. The PCR on the stool specimens resulted as being a very specific test. We suggest that a simple stool PCR method that we developed can be used to detect H. pylori , virulence genes, and in drug resistance studies either first line diagnostic methods in the laboratory or in the clinical management of dyspeptic patients.