Nosocomial bloodstream infections caused by Klebsiella pneumoniae: impact of extended-spectrum beta-lactamase (ESBL) production on clinical outcome in a hospital with high ESBL prevalence

The frequency of ESBL producing Klebsiella pneumoniae bloodstream infections (BSI) is high in Brazilian hospitals, however little is known regarding what role, if any, resistance plays in the expected outcome in hospitals with a high prevalence of these pathogens. From 1996 to 2001, hospital acquire...

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Published in:	BMC infectious diseases Vol. 6; no. 1; p. 24
Main Authors:	Marra, Alexandre R, Wey, Sérgio B, Castelo, Adauto, Gales, Ana Cristina, Cal, Ruy Guilherme R, Filho, José R do Carmo, Edmond, Michael B, Pereira, Carlos Alberto P
Format:	Journal Article
Language:	English
Published:	England BioMed Central Ltd 14-02-2006 BioMed Central BMC
Subjects:	Adolescent Adult Aged Anti-Bacterial Agents - therapeutic use Bacteremia - epidemiology Bacteremia - microbiology Bacteremia - mortality beta-Lactam Resistance beta-Lactamases - biosynthesis Brazil Child Child, Preschool Comorbidity Cross Infection - epidemiology Cross Infection - microbiology Cross Infection - mortality Female Humans Infant Klebsiella Infections - epidemiology Klebsiella Infections - microbiology Klebsiella Infections - mortality Klebsiella pneumoniae Klebsiella pneumoniae - isolation & purification Klebsiella pneumoniae - metabolism Logistic Models Male Middle Aged Multivariate Analysis Respiration, Artificial Retrospective Studies Risk Factors Brazil
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Summary:	The frequency of ESBL producing Klebsiella pneumoniae bloodstream infections (BSI) is high in Brazilian hospitals, however little is known regarding what role, if any, resistance plays in the expected outcome in hospitals with a high prevalence of these pathogens. From 1996 to 2001, hospital acquired K. pneumoniae BSI were evaluated retrospectively. Each patient was included only once at the time of BSI. ESBL producing strains were identified using the E-test method. The association of variables with the mortality related to bacteremia was included in a stepwise logistic regression model. One hundred and eight hospital acquired K. pneumoniae BSI met criteria for inclusion. Fifty two percent were due to ESBL producing strains. The overall in-hospital mortality was 40.8%. Variables independently predicting death by multivariate analysis were the following: mechanical ventilation (p = 0.001), number of comorbidities (p = 0.003), antimicrobials prescribed before bacteremia (p = 0.01) and fatal underlying disease (p = 0.025). Bacteremia due to ESBL producing K. pneumoniae strains was not an independent predictor for death in patients with BSI. An increased mortality in hospital-acquired BSI by K. pneumoniae was related to the requirement for mechanical ventilation, more than two comorbidities, the previous use of two or more antibiotics, and the presence of a rapidly fatal disease.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1471-2334 1471-2334
DOI:	10.1186/1471-2334-6-24