{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T12:31:14Z","timestamp":1791549074801,"version":"4.3.4"},"reference-count":40,"publisher":"BMJ","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Gut"],"accepted":{"date-parts":[[1997,9,5]]},"published-print":{"date-parts":[[1998,2,1]]},"abstract":"<jats:p>\n                    <jats:italic>Background<\/jats:italic>\n                    \u2014It has been reported that the acidity of gastric contents could be an important factor in regulating jejunal flora.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Aims<\/jats:italic>\n                    \u2014To investigate the effects of omeprazole induced changes in gastric pH on jejunal flora and bile acid metabolism.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Methods<\/jats:italic>\n                    \u2014Twenty one patients with gastric ulcer and 19 healthy volunteers were studied. Deconjugation of bile acids was detected using a bile acid breath test. Jejunal fluid was aspirated using a double lumen tube with a rubber cover on the tip and deconjugation was examined using thin layer chromatography. Fat malabsorption was detected by a triolein breath test.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Results<\/jats:italic>\n                    \u2014In the bile acid breath test, expired breath samples from all patients and healthy volunteers showed significantly greater\n                    <jats:sup>14<\/jats:sup>\n                    CO\n                    <jats:sub>2<\/jats:sub>\n                    specific activity after omeprazole treatment (20 mg\/day) than before treatment. Bacterial overgrowth was found in the jejunal fluid and gastric juice of both ulcer patients and healthy volunteers after omeprazole treatment. The following species were identified:\n                    <jats:italic>Escherichia coli<\/jats:italic>\n                    ,\n                    <jats:italic>Candida albicans<\/jats:italic>\n                    , enterococcus,\n                    <jats:italic>Lactobacillus bifidus<\/jats:italic>\n                    ,\n                    <jats:italic>Bacteroides vulgatus<\/jats:italic>\n                    ,\n                    <jats:italic>B uniformis<\/jats:italic>\n                    ,\n                    <jats:italic>Eubacterium lentum<\/jats:italic>\n                    ,\n                    <jats:italic>Eu parvum<\/jats:italic>\n                    , and\n                    <jats:italic>Corynebacterium granulosum<\/jats:italic>\n                    . All of these species, except\n                    <jats:italic>E coli<\/jats:italic>\n                    and\n                    <jats:italic>C albicans<\/jats:italic>\n                    , deconjugate bile acids. There was a significant correlation between\n                    <jats:sup>14<\/jats:sup>\n                    CO\n                    <jats:sub>2<\/jats:sub>\n                    activity and gastric pH, both before and after omeprazole treatment in both groups. The triolein breath test revealed impaired fat absorption in both groups after omeprazole treatment.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Conclusions<\/jats:italic>\n                    \u2014Both patients with gastric ulcer and healthy volunteers exhibited increased deconjugation of bile acids caused by bacterial overgrowth in the jejunum and fat malabsorption after omeprazole treatment. The bacterial overgrowth consisted of both anaerobes and aerobes with deconjugation ability and was probably associated with an omeprazole induced shift to neutral pH in the gastric juice.\n                  <\/jats:p>","DOI":"10.1136\/gut.42.2.266","type":"journal-article","created":{"date-parts":[[2010,6,30]],"date-time":"2010-06-30T12:46:12Z","timestamp":1277901972000},"page":"266-271","source":"Crossref","is-referenced-by-count":65,"title":["Omeprazole induces altered bile acid metabolism"],"prefix":"10.1136","volume":"42","author":[{"given":"K","family":"Shindo","sequence":"first","affiliation":[{"name":"The First Department of Internal Medicine, Yokohama City University, School of Medicine, 3\u20139 Fukuura, Kanazawa-ku, Yokohama 236, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Machida","sequence":"additional","affiliation":[{"name":"The First Department of Internal Medicine, Yokohama City University, School of Medicine, 3\u20139 Fukuura, Kanazawa-ku, Yokohama 236, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Fukumura","sequence":"additional","affiliation":[{"name":"The First Department of Internal Medicine, Yokohama City University, School of Medicine, 3\u20139 Fukuura, Kanazawa-ku, Yokohama 236, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K","family":"Koide","sequence":"additional","affiliation":[{"name":"The First Department of Internal Medicine, Yokohama City University, School of Medicine, 3\u20139 Fukuura, Kanazawa-ku, Yokohama 236, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R","family":"Yamazaki","sequence":"additional","affiliation":[{"name":"The First Department of Internal Medicine, Yokohama City University, School of Medicine, 3\u20139 Fukuura, Kanazawa-ku, Yokohama 236, 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