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Breath test can discriminate between a bacterial overgrowth and IBS
Date:12/19/2007

The gastrointestinal (GI) tract is colonized by bacteria immediately after birth; Escherichia coli, Streptococci and Clostridi are the first bacteria harboured by the colon, followed by anaerobic Enterococci, Lattobacilli and Bacteroidi. These commensal bacteria inhabiting the human intestine (i.e., intestinal microflora) participate in the development and maintenance of gut sensory and motor functions, including the promotion of intestinal propulsive activity; on the other hand, intestinal motility represents one of the major control systems of gut microflora, though the sweeping of excessive bacteria from the lumen. There is emerging evidence indicating that changes in this bi-directional interplay contribute to the pathogenesis of gut diseases, such as small intestinal bacterial overgrowth (SIBO).

Many factors affect the type and distribution of the bacteria along the GI tract, starting from the type of delivery and nursing in the first days of life, up to the food habits during the adult life: a SIBO is often present in adult population of westernized countries, because of poor daily intake of fibres and faecal stasis; such an overgrowth contributes to a chronic inflammation on intestinal mucosa and development of symptoms, such as abdominal pain, diarrhoea or stipsis.

These symptoms look like those of inflammatory bowel diseases (IBS) and, unfortunately, most of these patients with a bacterial overgrowth are inappropriately treated with topically-active non-steroidal anti-inflammatory agents. In fact, these compounds have no antibacterial activity and, therefore, they do not remove the causative factors of the symptoms (bacterial overgrowth) and are likely to provoke even severe adverse events.

The "breath test" is a recently developed test, which is able to detect elevated concentrations of hydrogen in the expired air. In presence of a SIBO, dietary carbohydrates are metabolised with production of massive amounts of hydrogen that are eli
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Contact: Jing Zhu
j.zhu@wjgnet.com
86-108-538-1901
World Journal of Gastroenterology
Source:Eurekalert

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