Table 2.
Baseline demographics, as assessed at the initial scan prior to ablation procedure
| All Subjects (n = 40) | Scan 2 1.5 T (n = 30) | Scan 2 3 T (n = 10) | p-value | |
|---|---|---|---|---|
| Male | 31 (78%) | 22 (73%) | 9 (90%) | 0.27 |
| Paroxysmal AF | 20 (50%) | 17 (56%) | 3 (30%) | 0.14 |
| CHA2DS2VASC Score | 1 (IQR 0–2) | 1 (IQR 0–2) | 0 (IQR 0–1.5) | 0.28 |
| AF duration (years) | 3.0 (IQR 2.1–5.3) | 2.5 (IQR 1.9–5.0) | 5.5 (IQR 2.6–12.5) | 0.19 |
| Significant Comorbidities | 22 (56%) | 16 (53%) | 6 (60%) | 0.71 |
| Age (years) | 61 ± 10 | 61 ± 8 | 61 ± 13 | 0.99 |
| Weight (kg) | 88 ± 17 | 88 ± 18 | 87 ± 12 | 0.77 |
| Height (cm) | 176 ± 7.1 | 176 ± 6.4 | 177 ± 9.3 | 0.60 |
| BMI (kg/m2) | 28.4 ± 5.3 | 28.7 ± 5.9 | 27.6 ± 3.1 | 0.48 |
| HR at baseline scan (bpm) | 61 ± 10 | 61 ± 8 | 61 ± 13 | 0.99 |
| Sinus rhythm at baseline scan | 25 (62.5%) | 19 (63%) | 7 (70%) | 0.70 |
| LV ejection fraction (%) | 60 ± 10 | 62 ± 10 | 58 ± 11 | 0.41 |
| LA size (ml) | 121 ± 32 | 122 ± 37 | 119 ± 19 | 0.75 |
| LA fibrosis at baseline (%) | 36.0 ± 13.9 | 36.7 ± 15.1 | 33.9 ± 9.3 | 0.49 |
| LA ejection fraction (%) | 30 ± 18 | 29 ± 19 | 34 ± 12 | 0.41 |
| LV native T1 time at baseline scan (msec) | 988 ± 22 | 991 ± 24 | 985 ± 21 | 0.33 |
P-value is for comparison between patients that underwent scan 2 in 1.5 T versus 3 T scanners
LA left atrium, LV left ventricle, BMI body mass index, HR heart rate, bpm beats per minute.LA fibrosis was determined on manual segmentation of the left atrial wall, and thresholded at an image intensity ratio of 0.97 to the blood pool mean- see Online Supplement for details [26]