TABLE 3.
Blocked Mitral Isthmus Parameters
| MI Block Parameters | Cases (n = 13) | Controls (n = 15) | P-Value |
|---|---|---|---|
| MI blocked (%) | 13/20 (65) | 15/22 (68) | 0.76 |
| Time to block (minutes) | 18 ± 8 | 18 ± 11 | 1.0 |
| Delay on MI during distal CS pacing (milliseconds) | 160 ± 30 | 174 ± 36 | 0.27 |
| MI ablation time (minutes) | 30 ± 14 | 33 ± 19 | 0.64 |
| Fluoroscopy for MI (minutes) | 12 ± 8 | 13 ± 9 | 0.76 |
| MI RF duration—total (minutes) | 18 ± 8 | 19 ± 10 | 0.77 |
| MI RF energy—total (kJ) | 29.6 ± 17.3 | 40.5 ± 30.7 | 0.26 |
| MI RF lesions—endo (N) | 6 ± 4 | 6 ± 3 | 1.0 |
| MI RF duration—endo (minutes) | 16 ± 8 | 15 ± 7 | 0.72 |
| MI RF energy—endo (kJ) | 28.3 ± 16.1 | 34.2 ± 25.8 | 0.48 |
| Patients with epicardial ablation (%) | 5113 (38) | 14115 (93) | 0.004 |
| MI RF lesions–epi (N) | 0.5 ± 0.8 | 1.9 ± 1.1 | 0.0008 |
| MI RF duration—epi (minutes) | 1.2 ± 1.7 (0,0–1.5) | 4.2 ± 3.5 | 0.009 |
| MI RF energy—epi (kJ) | 1.3 ± 2.4 | 6.3 ± 5.7 | 0.006 |
| Rapid-onset conduction delay—N (%) | 7 (54) | 1 (7) | 0.01 |
CS = coronary sinus; endo = endocardial; epi = epicardial; kJ = kilo Joules; MI = mitral isthmus; RF = radiofrequency.