Applying evidence in practice: a qualitative case study of the factors affecting residents' decisions.

Patient care based on best available evidence is increasingly viewed as the hallmark of good quality medical diagnosis and treatment, yet its uptake is often slow and uneven and the reasons underlying the slow diffusion of evidence-based guidelines remain elusive. The authors report a qualitative study conducted at a major US teaching hospital which sought to discover the reasons why an evidence-based anticoagulation guideline appeared to be applied irregularly, with problematic results. Using a theoretical framework derived from Rogers' work on the diffusion of innovation, this article describes the ways in which a group of residents evaluated and applied evidence in the context of caring for their patients. Future work in evidence-based practice can benefit from a greater emphasis on studies that use multi-method, qualitative designs to explore the complex ways in which people interact with information and the changes that ensue from its use.