KLRG1 and atrial fibrillation: Validation of both models revealed that Model 2 showed better predictive performance, and a nomogram was created to present the results visually.<h4>Conclusion</h4>The KLRG1 of CD8<sup>+</sup> Tcm and PD-1 of CD8<sup>+</sup> Tnaive are novel independent risk factors for AF recurrence after CBA and play a significant role in the early recurrence of AF.