Applying evidence and theory to guide clinical decision making--implications for asthma management

Evidence-based medicine has been described as the "conscientious, explicit and judicious use of current best evidence in making decisions about the healthcare of individual patients". Many sources of information may be used by doctors when making decisions about initiating asthma therapy. These include: personal experience, postgraduate education, continuous professional development and publications in peer-reviewed journals. However, despite these sources of information, available data suggest that it is often difficult to practice evidence-based medicine, particularly in general practice. In the future, physicians will be provided with better evidence of the relative efficacy of treatment to aid changes in clinical practice. This will be provided, in part, by large well-conducted clinical trials, systematic reviews and meta-analyses. Linked with these, will be other methods of presenting data, for example, the number of patients needed to treat (NNT) to prevent one clinically significant event (for example, an asthma exacerbation). Despite these advances, incorporation of evidence-based practice into routine asthma care will be a slow and complex process. However, this process can be facilitated by physician education and participation in intervention programmes. In addition, it is important that clinicians are trained in how to convey the best possible evidence to their asthma patients.