RESUMEN
Objective To compare clinical Pseudomonas aeruginosa different sources of β-lactamase-resistant phenotype differences,as to provide theoretical basis for guiding clinical rational use of antibiotics.Methods Isolation of 478 strains of Pseudomonas aeruginosa were collected from clinical specimens in the First Affiliated Hospital of Xi'an Jiaotong University from January to December 2015,by VITEK 2 Compact bacteria identification and drug sensitivity analysis of advanced expert system for β-lactamase-resistant phenotype,statistical analysis of drug resistance phenotype and antibiotic resistance.Results 478 strains of Pseudomonas aeruginosa were mainly composed of phenotype 5 and phenotype 3.Sputum,drainage fluid and bile duct bile specimens of Pseudomonas aeruginosa were based on phenotype 5,accounted for 31.08％,34.71％ and 38.46％.Multiple comparison x2 were 3.893,4.071 and 5.595,There was no statistical difference between groups compare significance (P＞0.05).Urine,secretions and whole blood samples of Pseudomonas aeruginosa were phenotype 3,accounted for 34.88 ％,27.78 ％,45.45 ％;Multiple comparison x2 were 6.654,9.956 and 9.852.There was no statistical difference between groups compare significance (P＞0.05).Sputum,drainage of liquid,bile duct bile and urine,secretion,whole blood specimens respectively source of Pseudomonas aeruginosa resistant phenotype distribution of two comparative difference was statistically significant (x2 =15.056～22.050,P＜0.05).Comparing the resistance of different β-lactamase-resistant phenotypes in Pseudomonas aeruginosa isolates from different sources:the sputum specimen source in imipenem,meropenem,piperacillin and piperacillin/tazobactam had significant difference (x2 =22.225～39.025,P＜0.05).There was statistical significance in department of hepatobiliary surgery only ceftazidime and meropenem differences (x2 =21.890～22.872,P＜0.05).Conclusion The phenotypic analysis of β-lactamase-resistant phenotypes of Pseudomonas aeruginosa from different specimens was different,which provided a theoretical basis for guiding the clinical application of antibiotics and the control of nosocomial infection of Pseudomonas aeruginosa.