Supraventricular arrhythmia by 24-hour ECG Holter Time Arrhythmias preop (1) (n=119) 7 days postop (2) (n=117) 3 months postop (3) (n=116) 6 months postop (4) (n=102) atrial extra - systoles * (n,%) Yes 107 (89, 90) 96 (87, 30) * 96 (94, 10) * 85 (83, 30) * No 12 (10, 10) 14 (12, 70) 6 (5, 90) 17 (16, 70) p p (1, 2) > 0, 05 p (1, 3) > 0, 05 p (1, 4) > 0, 05 Supraven - tricular tachycardia (n,%) Yes 27 (22, 70) 11 (9, 40) 10 (8, 60) 8 (6, 90) No 92 (77, 30) 106 (90, 60) 106 (91, 38) 108 (93, 10) p p (1, 2) <0, 05 p (1, 3) < 0, 05 p (1 - 4) = 0, 001 Note: * no counted atrial extrasystoles when AF is present on the entire Holter ECG recorder, after 7 days (n=110), 3 months and 6 months (n=102).