Is preoperative anxiety and depression associated with onset of delirium after cardiac surgery in older patients? A prospective cohort study.

Objectives: To investigate the prevalence of preoperative anxiety and depressive symptoms and their relationship with the occurrence of postcardiac delirium and to describe the evolution of these symptoms from preoperative admission until discharge.

Design: Descriptive, prospective, longitudinal study.

Setting: The intensive care unit and two cardiac surgery units in a university hospital setting.