Total (n=72)
Group A Successful* MI ablation without PMF Recurrence (n=62) Group B Unsuccessful MI ablation** (n=5) Group C PMF with MI pseudo-block (n=5)
P Value
Pre-procedural characteristics
Age (years) 62.4±10.1 62.5±10.2 66±12.7 57±5.8 0.3652
Male gender, n (%) 45 (62.5%) 37 (59.7%) 5 (100%) 3 (60%) 0.1995
Left atrial diameter (mm) 43.7±2.7 43.3±2.4 48±2 44.2±2.9 0.0004
Left ventricular ejection fraction (%) 52±5.5 52.4±4.6 47±13 52±4.5 0.1107
CHA2DS2-VASc score 1.86±1.28 1.87±1.27 2.4±1.52 1.2±1.09 0.3327
Previous AF ablation, n(%) 37 (51.4%) 29 (46.8%) 4 (80%) 4 (80%) 0.1492
Clinical arrhythmia at the time of procedure
AF, n(%) 40 (55.6%) 38 (61.3%) 1 (20%) 1 (20%) 0.0512
AT, n(%) 32 (44.4%) 24 (38.7%) 4 (80%) 4 (80%)
Procedural characteristics
Epicardial approach , n(%) 33 (45.8%) 28 (45.2%) 3 (60%) 2 (40%) 0.7851
MI ablation time (min)
Total 10.73±6.16 10.73±6.14 18.7±9.51†† 10.16±2.93 0.0262
Endocardial 10.12±5.87 10.27±5.86 17.66±8.54 9.96±3.14 0.0313
Epicardial 1±0.54 0.96±0.49 1.73±0.46‡‡ 0.5±0.42 0.0005
MI line dimensions
Length (mm) 32.0±4.3 31.7±4.2 36.2±1.8 32.2±5.0 0.0735
Width (mm) 13.8±4 13.7±3.6 18.6±6.6§ 11.2±3.6 0.0088
Post-procedural characteristics and outcome
Follow-up period (months) 22.2±8.1 21.7±8.4 27.2±6.1 24.6±4.9 0.2845
AT/AF recurrence, n(%) 16 (22.2%) 13 (21%) 2 (40%) 1 (20%) 0.6111
AT or mainly§§AT recurrence, n(%) 2 (2.8%) 2 (3.2%) 0 0 0.7682
AF or mainly§§AF recurrence, n(%) 14 (19.4%) 11 (17.8%) 2 (40%) 1 (20%)
Post-procedural antiarrhythmic medication#, n(%) 9 (12.5%) 6 (9.7%) 2 (40%) 1 (20%) 0.1246
Amiodarone, n(%) 5 (6.9%) 3 (4.8%) 2 (40%) 0 0.2317
Other, n(%) 4 (5.6%) 3 (4.8%) 0 1 (20%)