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Epidemiology and clinical features of bloodstream infections caused by AmpC-type-beta-lactamase-producing Klebsiella pneumoniae.
Antimicrob Agents Chemother. 2004 Oct; 48(10):3720-8.AA

Abstract

Cases of bacteremia caused by AmpC-type-beta-lactamase-producing Klebsiella pneumoniae isolates were retrospectively studied to determine the epidemiologic features and clinical outcomes of bloodstream infections. Among 389 blood isolates recovered from 1998 to 2002, 65 isolates (16.7%) were found to be extended-spectrum beta-lactamase (ESBL) or AmpC beta-lactamase producers. The beta-lactamases from 61 of the 65 isolates were characterized; 28 of 61 isolates produced AmpC-type enzymes (14 isolates each produced DHA-1 and CMY-1-like enzymes), 32 isolates produced TEM or SHV-related ESBLs, and 1 isolate produced a CTX-M-14-like enzyme. To compare the clinical features and outcomes of bloodstream infections caused by AmpC producers with those caused by TEM- or SHV-related ESBL producers, 27 patients infected with isolates producing AmpC-type enzymes (AmpC group) and 25 patients infected with isolates producing TEM- or SHV-related enzymes (ESBL group) were analyzed. There was no significant difference between the AmpC and the ESBL groups in terms of risk factors. When the initial response was assessed at 72 h after antimicrobial therapy, the treatment failure rate for the AmpC group was 51.9% (14 of 27 patients) and the 7- and 30-day mortality rates were 14.8 and 29.6%, respectively, which were similar to those for the ESBL group. When the mortality rate for the patients who received extended-spectrum cephalosporins as definitive treatment was assessed, all four patients in the DHA-1 group and one of three patients in the CMY-1-like group died. In summary, the prevalence of AmpC enzyme-producing K. pneumoniae was high at the Seoul National University Hospital, and the clinical features and outcomes for the patients infected with AmpC-producing organisms were similar to those for the patients infected with TEM- or SHV-related ESBL producers.

Authors+Show Affiliations

Department of Internal Medicine, Seoul National University College of Medicine, 28 Yongon-dong Chongno-gu, Seoul 110-744, Republic of Korea.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

15388426

Citation

Pai, Hyunjoo, et al. "Epidemiology and Clinical Features of Bloodstream Infections Caused By AmpC-type-beta-lactamase-producing Klebsiella Pneumoniae." Antimicrobial Agents and Chemotherapy, vol. 48, no. 10, 2004, pp. 3720-8.
Pai H, Kang CI, Byeon JH, et al. Epidemiology and clinical features of bloodstream infections caused by AmpC-type-beta-lactamase-producing Klebsiella pneumoniae. Antimicrob Agents Chemother. 2004;48(10):3720-8.
Pai, H., Kang, C. I., Byeon, J. H., Lee, K. D., Park, W. B., Kim, H. B., Kim, E. C., Oh, M. D., & Choe, K. W. (2004). Epidemiology and clinical features of bloodstream infections caused by AmpC-type-beta-lactamase-producing Klebsiella pneumoniae. Antimicrobial Agents and Chemotherapy, 48(10), 3720-8.
Pai H, et al. Epidemiology and Clinical Features of Bloodstream Infections Caused By AmpC-type-beta-lactamase-producing Klebsiella Pneumoniae. Antimicrob Agents Chemother. 2004;48(10):3720-8. PubMed PMID: 15388426.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Epidemiology and clinical features of bloodstream infections caused by AmpC-type-beta-lactamase-producing Klebsiella pneumoniae. AU - Pai,Hyunjoo, AU - Kang,Cheol-In, AU - Byeon,Jeong-Hum, AU - Lee,Ki-Deok, AU - Park,Wan Beom, AU - Kim,Hong-Bin, AU - Kim,Eui-Chong, AU - Oh,Myoung-Don, AU - Choe,Kang-Won, PY - 2004/9/25/pubmed PY - 2004/12/16/medline PY - 2004/9/25/entrez SP - 3720 EP - 8 JF - Antimicrobial agents and chemotherapy JO - Antimicrob Agents Chemother VL - 48 IS - 10 N2 - Cases of bacteremia caused by AmpC-type-beta-lactamase-producing Klebsiella pneumoniae isolates were retrospectively studied to determine the epidemiologic features and clinical outcomes of bloodstream infections. Among 389 blood isolates recovered from 1998 to 2002, 65 isolates (16.7%) were found to be extended-spectrum beta-lactamase (ESBL) or AmpC beta-lactamase producers. The beta-lactamases from 61 of the 65 isolates were characterized; 28 of 61 isolates produced AmpC-type enzymes (14 isolates each produced DHA-1 and CMY-1-like enzymes), 32 isolates produced TEM or SHV-related ESBLs, and 1 isolate produced a CTX-M-14-like enzyme. To compare the clinical features and outcomes of bloodstream infections caused by AmpC producers with those caused by TEM- or SHV-related ESBL producers, 27 patients infected with isolates producing AmpC-type enzymes (AmpC group) and 25 patients infected with isolates producing TEM- or SHV-related enzymes (ESBL group) were analyzed. There was no significant difference between the AmpC and the ESBL groups in terms of risk factors. When the initial response was assessed at 72 h after antimicrobial therapy, the treatment failure rate for the AmpC group was 51.9% (14 of 27 patients) and the 7- and 30-day mortality rates were 14.8 and 29.6%, respectively, which were similar to those for the ESBL group. When the mortality rate for the patients who received extended-spectrum cephalosporins as definitive treatment was assessed, all four patients in the DHA-1 group and one of three patients in the CMY-1-like group died. In summary, the prevalence of AmpC enzyme-producing K. pneumoniae was high at the Seoul National University Hospital, and the clinical features and outcomes for the patients infected with AmpC-producing organisms were similar to those for the patients infected with TEM- or SHV-related ESBL producers. SN - 0066-4804 UR - https://www.unboundmedicine.com/medline/citation/15388426/Epidemiology_and_clinical_features_of_bloodstream_infections_caused_by_AmpC_type_beta_lactamase_producing_Klebsiella_pneumoniae_ L2 - http://aac.asm.org/cgi/pmidlookup?view=long&pmid=15388426 DB - PRIME DP - Unbound Medicine ER -