Table 1.
Clinical characteristics by year of initial ablation
| 2003–2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | P value | |
|---|---|---|---|---|---|---|---|---|
| Initial ablations | 40 | 65 | 133 | 170 | 196 | 241 | 280 | NA |
| Repeat ablations | 3 (7.0%) | 14 (17.7%) | 43 (24.4%) | 63 (27.0%) | 71 (26.6%) | 85 (26.1%) | 100 (26.3%) | =0.036* |
| Total ablations | 42 | 79 | 176 | 233 | 267 | 326 | 380 | NA |
| Age (years) | 59.0 ± 11.1 | 58.4 ± 10.5 | 61.6 ± 9.9 | 61.4 ± 10.6 | 62.1 ± 10.3 | 62.8 ± 10.0 | 64.3 ± 10.0 | <0.0001* |
| Gender (% female) | 35.0% | 23.1% | 23.3% | 30.6% | 25.5% | 30.3% | 31.8% | =0.202 |
| Duration of AF (years) | 5.6 ± 5.3 | 7.9 ± 8.0 | 6.9 ± 6.8 | 6.6 ± 7.8 | 5.9 ± 6.2 | 6.7 ± 7.8 | 6.0 ± 6.5 | =0.336 |
| # Drugs failed | 1.55 ± 0.96 | 1.58 ± 1.01 | 1.41 ± 1.18 | 1.22 ± 1.00 | 1.15 ± 0.97 | 1.25 ± 0.98 | 1.34 ± 1.14 | =0.336 |
| Average CHADS2 score | 0.77 ± 0.95 | 0.58 ± 0.88 | 0.78 ± 0.83 | 0.70 ± 0.88 | 0.78 ± 0.97 | 0.91 ± 0.94 | 1.15 ± 1.08 | <0.0001* |
| Body mass index | 28.1 ± 4.3 | 29.2 ± 5.5 | 29.5 ± 5.4 | 29.5 ± 5.4 | 29.3 ± 5.1 | 29.5 ± 5.4 | 29.9 ± 5.6 | =0.601 |
| LA size (cm) | 4.13 ± 0.77 | 4.36 ± 0.66 | 4.37 ± 0.62 | 4.38 ± 0.67 | 4.31 ± 0.71 | 4.26 ± 0.67 | 4.29 ± 0.72 | =0.308 |
| Hypertension | 45.0% | 24.6% | 40.6% | 38.8% | 46.4% | 49.0% | 57.9% | <0.0001* |
| Diabetes | 10.0% | 13.8% | 6.8% | 7.1% | 8.2% | 5.8% | 12.9% | =0.458 |
| Cardiomyopathy | 2.5% | 13.3% | 10.5% | 9.4% | 5.1% | 7.1% | 8.9% | =0.710 |
| Coronary artery disease | 7.5% | 10.8% | 8.3% | 11.8% | 15.3% | 15.5% | 15.0% | =0.021* |
| Prior cardioversion | 45.0% | 44.6% | 44.4% | 47.6% | 46.4% | 46.3% | 48.6% | =0.415 |
| Prior stroke/TIA | 2.5% | 1.5% | 8.3% | 3.5% | 6.1% | 7.1% | 8.9% | =0.005* |
AF atrial fibrillation, TIA transient ischemic attack, NA not applicable
*P < 0.05