替加環(huán)素的抗生素后效應及影響因素的研究
[Abstract]:Background and purpose: with the widespread use of antimicrobial agents in the clinic, especially the use of irrational antibiotics, the drug resistance has been produced and enhanced. At present, drug resistant bacteria have become the main pathogens of nosocomial infection, which seriously threaten the safety of human life and bring great challenges to clinical treatment. In 2005, tegicycline was approved to be listed in the United States. As a new type of glycyl cyclin antibacterial agent, because of its super broad-spectrum antimicrobial activity, especially for a variety of clinical common drug resistant bacteria, it has been widely paid attention to. This paper has studied the multidrug resistance of tegacycline to the Bauman immobile. Multidrug-resistant Acinetobacter baumannii (MDR-AB), methicillin resistant Staphylococcus aureus (methicillin-resistant Staphylococcus aureus, MRSA), and in vitro antibiotics of Escherichia coli and Escherichia coli (extended-spectrum beta-lactamases, ESBL) and standard strains of Escherichia coli. Post Antibiotic Effect (PAE) and its influencing factors are designed to improve the understanding of the antibacterial activity of tegocycline in vitro and provide the basis for clinical rational use. Methods: except for the standard Escherichia coli strain, ATCC25922, the remaining strains were isolated from the clinical isolation of the First Affiliated Hospital of Dalian Medical University. The minimum inhibitory concentration (MIC) of each strain was measured with the dilution method of broth, and the PAE of tegacycline was measured by plate colony counting method in vitro. The PAE values of the tested strains were respectively exposed to 1H and 2H at the 1,2.5,5,10 times of the MIC drug concentration in their respective 1,2.5,5,10 times, and by the determination of tegacycline and cefperidin. The effect of combined use of sodium ketone sodium sulbactam sodium (Shu Pushen) on the PAE value of MDR-AB was observed. Results: This study found that tegocyclin could produce PAE with PAE. tegocycline for MDR-AB to produce 0.51-2.26h unequal to MDR-AB, averaging 0.99 + 0.61h; 0.57-2.03 for ESBL positive Escherichia coli could produce 0.57-2.03. The average PAE of H is 1.25 + 0.55h, and MRSA can produce PAE with unequal 1.59-4.25h, and the average value is 2.67 + 0.88h. Meanwhile, the PAE of the standard strain of tegocyclin against the standard Escherichia coli strain ATCC25922 is also measured. The range is between 0.66-2.68h, and the average of 1.53 + 0.75h. There was significant difference in the difference between the standard strains of Escherichia coli and Escherichia coli (P0.01), but there was no significant difference between the other strains (P0.05). In this study, all the tested strains showed that the PAE value increased with the increase of contact time, including the difference of ESBL positive Escherichia coli, MRSA and ATCC25922. There were statistical significance (P0.05), but for MDR-AB, although PAE increased with time, the difference was not statistically significant (P0.05):PAE with the increase of drug concentration, and for most of the strains, the difference was statistically significant (P0.05) compared with PAE (P0.05). 0.37,0.73h, the PAE of the combined drug was 1.23h, and the two kinds of antibiotics showed additive effect. Conclusion: 1. tegocycline can produce MDR-AB, MRSA, ESBL positive Escherichia coli and Escherichia coli standard strain ATCC25922 to produce 0.51-4.25h unequal PAE.2. tegocyclin for MRSA PAE obviously longer than that of MDR-AB, Escherichia coli. 5922 PAE, the difference was statistically significant (P0.05) the PAE value of tegocyclin to the experimental strains was increased with the concentration of drug and the increase of contact time,.4. tegocycline could produce a PAE of ESBL positive Escherichia coli longer than ESBL positive Escherichia coli, but there was no statistical difference between the two (P0.05).5. tegocyclin. The combination of Shupushen and MDR-AB can increase the PAE value of MDR-AB.
【學位授予單位】:大連醫(yī)科大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:R96
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