Baseline assessments are scheduled within 1 month prior to surgery. Delirium (CAM-ICU/ICDSC) will be assessed daily while in hospital, and the CBB will be performed during the postoperative period (POD 4–10). The CBB will also be administered at 3, 6 and 12 months after surgery (figure 1). In-hospital CBB assessments will be administered by trained research personnel who will also conduct the CAM. Delirium assessments are also conducted twice daily by clinical nursing staff, and this data will be abstracted from the chart.