The purpose of this article is to critically analyze research that describes symptom severity in heart failure. Medline, CINAHL, Psych Info, and Science Direct databases (2000 to July 2006) were searched to locate published studies that described or defined symptom severity or like terms in heart failure. A total of 323 publications were initially reviewed, from which 21 articles (6.51%) were selected based on the inclusion criteria for this article. Multiple terms are used synonymously, and inappropriately at times, to describe symptom severity. Rarely, symptom severity is adequately defined or fully described. Varying instruments and methods are used to measure symptom severity. The literature includes inappropriate measurement methods of symptom severity. Symptom severity should be clearly defined, differentiated from related terms, and measured appropriately. Comparisons across studies are impeded when terms are not clearly defined or inappropriately measured.
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