Randomization
Participants will be randomly assigned in a 1:1 ratio to undergo either catheter ablation ± DCCV (if in AF) or a sham procedure ± DCCV (if in AF). A computerized central blocked randomization design will be generated and stratified according to type of AF (paroxysmal/persistent). Randomization blocks will be performed with “ralloc,” Stata's randomization process v.16.0. The block sizes will not be disclosed to study investigators, to ensure concealment.The randomization sequence and study‐group assignments will be prepared and placed in sequential numbered sealed, opaque envelopes by a fellow with no involvement in the execution of the trial. The envelopes will be kept securely by a sponsor administrator not involved in the conduct of the study.The allocation will remain concealed until after sedation has been achieved at the time of the procedure.