Cameron MJ, et al. - External validation of 3 risk models viz the postoperative atrial fibrillation (POAF) score, the CHA₂DS₂-VASc score, and the Atrial Fibrillation Risk Index, proposed for preoperative prediction of POAF in cardiac surgical patients, was attempted in this prospective cohort study. As predictors of POAF in cardiac surgical patients, the 3 prediction scores demonstrated limited ability, nonetheless, they may be useful in preventive strategies targeting patients with moderate or high risk of PAOF in comparison with preventive strategies applied to all patients.