The rate of ventricular extrasystoles according to Lown's criteria Time Arrhythmias preop (1) (n=119) 7 days postop (2) (n=117) 3 months postop (3) (n=116) 6 months postop (4) (n=116) Lown's criteria (n,%) Lown 0 47 (39, 50) 20 (17, 10) 38 (32, 80) 44 (37, 90) Lown 1 - 2 47 (39, 50) 55 (47, 00) 57 (49, 10) 49 (42, 20) Lown ≥ 3 25 (21, 00) 42 (35, 90) 21 (18, 10) 23 (19, 80) p p (1 - 2) < 0, 05 p (1 - 3) > 0, 05 p (1 - 4) > 0, 05 Lown ≥ 3 (n,%) 25 (21, 00) 42 (35, 90) 21 (18, 10) 23 (19, 80) Lown < 3 (n,%) 94 (79, 00) 75 (64, 10) 95 (81, 90) 93 (80, 20) p p (1 - 2) < 0, 05 p (1 - 3) > 0, 05 p (1 - 4) > 0, 05 3.2.2.