烧伤病房肠杆菌科细菌耐药性及其危险因素分析

Objective To study the risk factors of infection of extended-spectrum beta-lactamases (ESBL) -producing strains and drug resistance of Enterobacteriaceae that infected burn patients. Methods A retrospective study was performed on clinical information of 92 patients with Enterobacteriaceae infection in our burn unit from January 2001 to December 2008. The distribution and drug resistance of Enterobacteriaceae , and the detection rate, drug resistance of ESBL-producing strains, and its risk factors of nosocomial infection were analyzed. Data were processed with Chi-square test. Results One hundred and nine strains of Enterobacteriaceae were isolated, with 38 (34.9%) strains of Enterobacter cloacae , 25 (22.9%) strains of Escherichia coli , 22 (20. 2%) strains of Klebsiella pneumoniae , 13 (11.9%) strains of Proteus mirabilis , and 11 (10. 1%) other strains of Enterobacteriaceae . Enterobacteriaceae were moderately or highly resistant to antibiotics except imipenem, resistance rate of which was less than 8. 0%. ESBL-producing strains accounted for 44. 0% in Escherichia coli , and 77. 3% in Klebsiella pneumoniae . Drug-resistance rate of ESBL-producing strains to antibiotics was obviously higher than that of non ESBL-producing strains. Length of hospital stay longer than 20 days, and use of the third-generation cephalosporin longer than 5 days, quinolone antibiotics longer than 7 days, and topical antibiotics longer than 5 days were the risk factors of nosocomial infection caused by ESBL-producing strains, comparing with non ESBL-producing strains, the difference was statistically significant (with χ2 value respectively 5.491 , 4.441, 15. 186, 4. 938 , P values all below 0. 05) . Conclusions Enterobacteriaceae strains in burn unit of our hospital are highly drug resistant, with high lactamase-producing rates, calling for intense monitor to control the risk factors that predispose the infection of ESBL-producing strains in order to lower the infection rate.

Analysis of drug resistance and risk factors of Enterobacteriaceae in burn units