Unexpected Outcomes of Measuring Decision Regret: Using a Breast Cancer Decision-Making Case Example.

Shared decision making can help patients feel supported and empowered when deciding between healthcare options. Decision regret can be a meaningful measure of the quality of that encounter. However, in a patient-engaged research study examining shared decision making for breast cancer surgery, decision regret was a difficult construct to assess, and asking questions about decision regret caused the patient to experience that emotion upon reflection.