The impact of frailty on postoperative delirium in cardiac surgery patients.

Objective: To determine if adding frailty measures to the EuroSCORE II improves model performance in predicting postoperative delirium.

Methods: In a prospective observational study in elective cardiac surgery patients, frailty was defined using the Modified Fried Criteria (MFC), the Short Physical Performance Battery (SPPB) and a 35-item Frailty Index (FI). The primary outcome was postoperative delirium, assessed using the Confusion Assessment Method (CAM).