The importance of addressing multidrug resistance and not assuming single-drug resistance in case-control studies.

Abstract:

BACKGROUND:Case-control studies analyzing antibiotic exposure as a risk factor for antimicrobial resistance usually assume single-drug resistance in the bacteria under study, even though resistance to multiple antimicrobials may be present. Since antibiotic selection pressures differ depending on the susceptibility profile of the antimicrobial-resistant bacteria, an accurate assessment of whether exposure to an individual antimicrobial is a risk factor for the emergence of resistance should distinguish between single-drug-resistant and multidrug-resistant bacteria. OBJECTIVE:To determine whether the exposures to individual antibiotics that were identified as independent risk factors in case-control studies differed depending on whether single-drug-resistant or multidrug-resistant bacteria were evaluated. DESIGN:Two retrospective case-control studies were performed with data on patients harboring Pseudomonas aeruginosa strains resistant only to ciprofloxacin (CRPA) and patients harboring P. aeruginosa strains resistant to ciprofloxacin and other antibiotics (multidrug-resistant P. aeruginosa [MDR-PA]). These 2 groups were compared with patients not harboring P. aeruginosa. SETTING:Two tertiary care hospitals. RESULTS:A total of 41 patients harboring CRPA and 151 patients harboring MDR-PA were identified and matched to 192 control subjects. By conditional logistic regression, independent risk factors associated with presence of CRPA were nonambulatory status (OR, 5.6 [95% confidence interval {CI}, 1.4-23]; P=.02) and prior ciprofloxacin exposure (OR, 5.0 [95% CI, 1.2-21]; P=.03). Independent risk factors for presence of MDR-PA were a Charlson score greater than 2 (OR, 3.3 [95% CI 1.8-6.0]; P<.001) and exposure to quinolones (OR, 2.8 [95% CI, 1.2-5.0]; P=.001), third- and fourth-generation cephalosporins (OR, 3.5 [95% CI, 1.7-7.1]; P<.001), imipenem (OR, 3.8 [95% CI, 1.2-12.1]; P=.02), and/or aminoglycosides (OR, 2.3 [95% CI, 1.04-5.1]; P=.04). CONCLUSION:There were substantial differences in exposure to individual antimicrobials between patients harboring CRPA and patients harboring MDR-PA. Future case-control studies addressing risk factors for single-drug-resistant bacteria should consider the complete susceptibility profile of the bacteria under investigation.

authors

D'Agata EM,Cataldo MA,Cauda R,Tacconelli E

doi

10.1086/505917

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

670-4

issue

7

eissn

0899-823X

issn

1559-6834

pii

ICHE2005055

journal_volume

27

pub_type

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