Linked Life Data

9786470

Source:http://linkedlifedata.com/resource/pubmed/id/9786470

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1998-12-28
pubmed:abstractText
The in-vitro activity of a combination of ranitidine bismuth citrate (RBC) and metronidazole against metronidazole-resistant Helicobacter pylori strains (MIC > or = 8 mg/L) was evaluated by agar dilution chequerboard and killing curve methods. Twenty-five metronidazole-resistant strains were used in the chequerboard method, using Mueller-Hinton agar plus 7% lysed horse blood, an inoculum of 10(6) cfu/spot and incubation in a 10% CO2 atmosphere at 37 degrees C for 3-5 days. Synergy was defined as a fractional inhibitory concentration (FIC) index of < or = 0.5, partial synergy as 0.5 < FIC < or = 1, indifference as 1 < FIC < or = 4 and antagonism as FIC > 4. For nine strains, killing curves were constructed for metronidazole and RBC individually and in combination at 1 x MIC. The number of viable colonies was counted at time 0 and after 2, 4, 6, 8 and 24 h; the combination was defined as synergic if it produced a decrease of > or = 2 log10 cfu/mL compared with the most active single agent. Metronidazole MICs ranged from 8 to 128 mg/L and RBC MICs from 0.125 to 4 mg/L. The minimum FIC ranged from 0.28 to 1 and the maximum FIC from 1 to 1.25. When RBC and metronidazole were combined, all the metronidazole-resistant H. pylori strains revealed partial (68%) or total (32%) synergy. Five out of the nine strains also exhibited synergy at 4, 6 or 8 h incubation when tested by the killing curve method although three other strains exhibited no synergy. In the last strain, a 2log10 decrease in the initial number was observed with RBC alone or combined with metronidazole.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0305-7453
pubmed:author
pubmed:issnType
Print
pubmed:volume
42
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
309-14
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Study of the combination of ranitidine bismuth citrate and metronidazole against metronidazole-resistant Helicobacter pylori clinical isolates.
pubmed:affiliation
Department of Microbiology, Hospital Universitario de la Princesa, Madrid, Spain. mlbrea@microb.net
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't