Clinical usefulness of the definitions for defining characteristics of activity intolerance, excess fluid volume and decreased cardiac output in decompensated heart failure: a descriptive exploratory study - Souza, Vanessa de; Zeitoun, Sandra Salloum; Lopes, Camila Takáo; Oliveira, Ana Paula Dias de; Lopes, Juliana de Lima; Barros, Alba Lucia Bottura Leite de (Journal of Clinical Nursing, 2015)