Was designed to search for risk factors favoring frequent acute exacerbation of chronic bronchitis in adults. Influence of Pharmacokinetic and Pharmacodynamic Principles on Antibiotic Selection.When evaluating the efficacy of antibiotics for the treatment of respiratory tract infections, such as community acquired pneumonia and acute exacerbations of chronic bronchitis, assessment of clinical cure may not be the most relevant parameter, as it may not be related to microbiological eradication or to the minimum inhibitory concentration (MIC) of the infecting pathogen. Theoretically, antibiotics are not necessary for acute exacerbation of simple chronic bronchitis, but may be needed to reinforce bronchodilatation therapy and respiratory physical therapy. It was also found that earlier initiation of group 2 antibiotic therapy may be useful for patients with a high risk of exacerbation. This study demonstrated the crucial need for rigorous surveillance by a lung specialist, the importance of not smoking, and the beneficial effect of optimized treatment. Knowledge of pharmacodynamics allows optimum use of antibiotics; in vitro models, animal models, and retrospective and prospective clinical trials have shown that the use of such knowledge optimizes bacteriological eradication and enhances patient outcome. In a second stage (obstructive chronic bronchitis), antibiotic therapy can be useful for patients with two or three Anthonisen criteria. For beta-lactams, the pharmacodynamic parameter that best correlates with eradication is time (T) above MIC (T > antibiotics pregnancy autism aldara MIC); for aminoglycosides and fluoroquinolones, it is the area under the curve at 24 hours (AUC(24))-to-MIC ratio (AUC(24)/MIC).
In the future, pharmacodynamic studies will be used not only to assess optimal ways for antibiotics to eradicate resistant pathogens, but also to investigate the ability of antibiotics to prevent the development of resistance on therapy and to eradicate pathogens from colonizing sites Update on the use of levofloxacin in the management of acute exacerbations of chronic bronchitis with risk factorsINDICATIONS FOR ANTIBIOTICS. At a third stage (chronic respiratory failure), first line therapy should include group 2 antibiotics. Pharmacodynamics correlates the concentration of antibiotic in the blood or at the infection site with its biological effect against the organism (bacteriological eradication). The findings suggest that certain classical risk factors such as age should be revisited.
It is more relevant to study the efficacy of the antibiotic in eradicating the bacterial pathogen, because this is frequently related to both the MIC of the pathogen and the antibiotic dosage regimen. Group 1 antibiotics for occasional exacerbation, group 2 antibiotics in codi of failure or as first line treatment for patients with frequent exacerbations; anti-pneumococcal fluoroquinolones are a possible alternative. If fever persists for more than three days, group 1 antibiotics can be prescribed. In patients with acute exacerbation of chronic bronchitis depend on the stage of the chronic disease.
