During a median follow-up period of 890 days ( interquartile range : 224 to 1,563 days ) , compared to FIRM-blinded therapy , patients receiving FIRM-guided ablation maintained higher freedom from AF after 1.2 0.4 procedures ( median 1 ; interquartile range : 1 to 1 ) ( 77.8 % vs. 38.5 % , p = 0.001 ) and a single procedure ( p < 0.001 ) and higher freedom from all atrial arrhythmias ( p = 0.003 ) .