RT Journal Article
SR Electronic
T1 Influence of decision aids on patient preferences for anticoagulant therapy: a randomized trial
JF Canadian Medical Association Journal
JO CMAJ
FD Canadian Medical Association
SP 1583
OP 1587
DO 10.1503/cmaj.060837
VO 176
IS 11
A1 Anne Holbrook
A1 Renée Labiris
A1 Charles H. Goldsmith
A1 Kaede Ota
A1 Sandra Harb
A1 Rolf J. Sebaldt
YR 2007
UL http://www.cmaj.ca/content/176/11/1583.abstract
AB Background: Decision aids have been shown to be useful in selected situations to assist patients in making treatment decisions. Important features such as the format of decision aids and their graphic presentation of data on benefits and harms of treatment options have not been well studied. Methods: In a randomized trial with a 3 × 2 factorial design, we investigated the effects of decision aid format (decision board, decision booklet with audiotape, or interactive computer program) and graphic presentation of data (pie graph or pictogram) on patients' comprehension and choices of 3 treatments for anticoagulation, identified initially as “treatment A” (warfarin), “treatment B” (acetylsalicylic acid) and “treatment C” (no treatment). Patients aged 65 years or older without known atrial fibrillation and not currently taking warfarin were included. The effect of blinding to the treatment name was tested in a before–after comparison. The primary outcome was change in comprehension score, as assessed by the Atrial Fibrillation Information Questionnaire. Secondary outcomes were treatment choice, level of satisfaction with the decision aid, and decisional conflict. Results: Of 102 eligible patients, 98 completed the study. Comprehension scores (maximum score 10) increased by an absolute mean of 3.1 (p < 0.01) after exposure to the decision aid regardless of the format or graphic presentation. Overall, 96% of the participants felt that the decision aid helped them make their treatment choice. Unblinding of the treatment name resulted in 36% of the participants changing their initial choice (p < 0.001). Interpretation: The decision aid led to significant improvement in patients' knowledge regardless of the format or graphic representation of data. Revealing the name of the treatment options led to significant shifts in declared treatment preferences.