<qa>  What is the name of the two types of AF and left AT?Non-paroxysmal AF and left AT are characterized by fast and regular atrial activities, complex fractionated atrial electrograms, consistent direction of wave front propagation, and low peak-to-peak voltage. Advanced high-density three-dimensional catheter mapping strategies to target the evaluation of these characteristics and mechanisms responsible for the AF and left AT, identification of atrial areas with low peak-to-peak voltages and determination of the critical atrial targets for catheter ablation during the procedures would be essential. 