The nurse is searching for evidence related to a PICOT question. What source provides the best evidence?
a. Medline database
b. Cochrane library
c. CINAHL database
d. Library of Congress
B
The top level of evidence consists of systematic reviews. The major purpose of systematic re-views is to provide high-quality evidence to busy clinicians who do not have the time to spend finding original studies and then reviewing, critiquing, and synthesizing evidence from each study. These reviews can be found in the Cochrane library; the Medline and CINAHL databases provide single studies that are not reviewed, critiqued, or synthesized for the clinician. The Li-brary of Congress houses the world's largest collection of historical and cultural references; it does not provide best evidence related to health care PICOT questions.
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