Table 1.
Demographic and Patient Characteristics
| Variable | Age < 75 (n = 548) | Age ≥ 75 (n = 148) | P value |
|---|---|---|---|
| Age (years), mean (std) | 60.3 (9.9) | 78.5 (2.8) | <0.001 |
| BMI (kg/m2), mean (std) | 30.7 (7.1) | 27.1 (5.4) | <0.001 |
| Male gender, n (%) | 340 (62.0) | 81 (54.7) | 0.108 |
| Caucasian, n (%) | 510 (93.4) | 148 (100) | <0.001 |
| Paroxysmal AF, n (%) | 219 (40.0) | 54 (36.5) | 0.450 |
| Non-Paroxysmal AF, n (%) | 329 (60.0) | 94 (63.5) | 0.450 |
| Length of time in AF (months), median [IQR] | 42.0 [12.0,96.0] | 36.0 [9.3,81.8] | 0.742 |
| NYHA class III or IV, n (%) | 277 (50.5) | 103 (69.6) | <0.001 |
| Prior Myocardial Infarction, n (%) | 44 (8.0) | 22 (14.9) | 0.017 |
| LVEF (%), mean (std) | 55.8 (11.8) | 56.2 (10.0) | 0.643 |
| Preoperative PM, n (%) | 52 (9.5) | 26 (17.6) | 0.008 |
| LA diameter (cm), mean (std) | 5.0 (1.1) | 5.1 (1.0) | 0.134 |
| Smoker, n (%) | 205 (37.4) | 61 (41.2) | 0.446 |
| Chronic lung disease, n (%) | 29 (5.3) | 12 (8.1) | 0.236 |
| Diabetes, n (%) | 96 (17.5) | 26 (17.6) | 1.000 |
| Hypertension, n (%) | 374 (68.2) | 117 (79.1) | 0.011 |
| Hyperlipidemia, n (%) | 314 (57.3) | 92 (62.2) | 0.302 |
| Peripheral vascular disease, n (%) | 46 (8.4) | 23 (15.5) | 0.013 |
| Cerebrovascular disease, n (%) | 82 (15.0) | 30 (20.3) | 0.130 |
| Renal failure, n (%) | 18 (3.5) | 7 (5.1) | 0.450 |
| Dialysis, n (%) | 5 (1.1) | 1 (0.7) | 1.000 |
AF = atrial fibrillation, LA = left atrium, STD = standard deviation, LVEF = left ventricular ejection fraction, NYHA = New York Heart Association, PM = pacemaker, BMI = body mass index, CPB = cardiopulmonary bypass, ICU = intensive care unit