Table 1. Baseline Demographic Characteristics of Patients Who Underwent Ablationa.
| Characteristic | Patients, No. (%) (N = 549) |
|---|---|
| Age, mean (SD), y | 60 (9) |
| Male | 434 (79) |
| Body mass index, mean (SD)b | 29 (5) |
| Ejection fraction, mean (SD), % | 57 (10) |
| Left atrial diameter, mean (SD), mm | 45 (6) |
| Time from first diagnosis of AF, mean (SD), y | 4 (4) |
| Continuous AF for >6 mo | 417 (76) |
| Baseline AF burden, % of time | |
| Mean (SD) | 82 (36) |
| Median (IQR) | 100 (0.03-100) |
| Hypertension | 307 (56) |
| Diabetes | 55 (10) |
| Coronary artery disease | 44 (8) |
| Stroke or transient ischemic attack | 38 (7) |
| Heart failure | 25 (5) |
| CHADS2 score | |
| 0 | 191 (35) |
| 1 | 259 (47) |
| 2 | 62 (11) |
| >2 | 37 (7) |
| Baseline treatment | |
| β-Blocker | 326 (59) |
| Calcium channel blocker | 90 (16) |
| Cardiac glycoside | 80 (15) |
| Antiarrhythmic medication | |
| Class I | 71 (13) |
| Class III | 66 (12) |
| Amiodarone | 121 (22) |
Abbreviations: AF, atrial fibrillation; CHADS2, congestive heart failure, hypertension, age older than 75 years, diabetes (each 1 point), and stroke or transient ischemic attack (2 points); IQR, interquartile range.
a
Data are presented as number (percentage) of patients unless otherwise indicated.
b
Calculated as weight in kilograms divided by height in meters squared.