Published
2009-06-15

How to Cite

Álvarado Ysasis, L. S., García, J., Rodríguez, E., Carpio, C., Salazar, E., Flores Fernández, E. M., Betancourt, J. G., Araque Calderón, Y., & Guzmán Lista, M. (2009). Frequency of Nosocomial Enterobacterial b-lactamase-Producing of Extended Spectrum, Cumana, Venezuela. NOVA Biomedical Sciences Journal, 7(11), 52-59. https://doi.org/10.22490/24629448.417
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Frequency of Nosocomial Enterobacterial b-lactamase-Producing of Extended Spectrum, Cumana, Venezuela

DOI: https://doi.org/10.22490/24629448.417
Section
Research Article (before OJS)
Luzmila Sofía Álvarado Ysasis
José García
Eliosmar Rodríguez
Carmen Carpio
Elsa Salazar
Evelin Margarita Flores Fernández
José Gregorio Betancourt Universidad de Oriente
Yasmina Araque Calderón
Militza Guzmán Lista

This study aimed to evaluate the frequency of nosocomial enterobacterial b-lactamase producing extended spectrum in patients confined in the Hospital Universitario “Antonio Patricio de Alcalá, Cumana, Venezuela, during the period September-November 2005. The production of b-lactamases and extended spectrum in vitro antimicrobial susceptibility were determined by the method of double-disk synergy and disk diffusion. It took 35 bacterial isolates and the increased number of nosocomial infections occurred in the intensive care unit and neonatology with 13/35 (37.15%) and 9 / 35 (25.72%) cases respectively. 51.42% of positive cultures occurred in samples of secretions. Klebsiella pneumoniae showed a frequency of 20/35 (57.14%). Only 27/35 isolates (77.14%) produced β-lactamases and extended spectrum Klebsiella pneumoniae was the most common species in the production of these, with 14/35 (40.0%). Enterobacteriaceae expressed greater percentage of resistance to ceftazidime (77.77%), cefotaxime (70.37%) and cefepime (40.74%). K. pneumoniae and E. coli, showed 59.25% resistance to amoxicillin / clavulanate. All showed 100% sensitivity to carbapenems.

Long periods of hospitalization are major risk factors for acquiring nosocomial infections and the emergence of strains producing b-lactamases extended spectrum result from misuse of broad-spectrum cephalosporins, which poses significant challenges for the need to use carbapenems with the risk of exerting a selective pressure which in time will cause future resistance.