Table 1.
Study Cohort Characteristics
| Demographic variables | Overall cohort | No prior episodes | Recurrent syncope | P value |
|---|---|---|---|---|
| N=3580 | N=2299 | N=1281 | ||
| N (%) | N (%) | N (%) | ||
| Age, mean (SD) | 72.8 (9.0) | 72.8 (9.0) | 72.7 (9.0) | 0.766 |
| Age | 0.751 | |||
| 60 to <70 | 1539 (43.0) | 997 (43.4) | 542 (42.3) | |
| 70 to <80 | 1155 (32.3) | 727 (31.6) | 428 (33.4) | |
| 80 to <90 | 729 (20.4) | 473 (20.6) | 256 (20.0) | |
| 90+ | 157 (4.4) | 102 (4.4) | 55 (4.3) | |
| Length of Stay (hours) | ||||
| Admitted, mean (SD) | 96.8 (110.4) | 95.84 (125.20) | 98.29 (84.40) | 0.685 |
| Observed, mean (SD) | 36.5 (38.6) | 34.43 (34.51) | 40.74 (45.58) | 0.005 |
| Discharged, mean (SD) | 9.4 (40.0) | 8.96 (33.50) | 10.26 (51.29) | 0.687 |
| Gender | 0.820 | |||
| Female | 1732 (48.4) | 1109 (48.2) | 623 (48.6) | |
| Male | 1848 (51.6) | 1190 (51.8) | 658 (51.4) | |
| Race | 0.778 | |||
| White or Caucasian | 2973 (83.5) | 1909 (83.7) | 1064 (83.2) | |
| Black or African American | 478 (13.4) | 305 (13.4) | 173 (13.5) | |
| Asian | 41 (1.2) | 27 (1.2) | 14 (1.1) | |
| Other | 67 (1.9) | 39 (1.7) | 28 (2.2) | |
| Co-Morbidities | ||||
| Congestive Heart Failure | 449 (12.5) | 251 (10.9) | 198 (15.5) | <0.001 |
| Coronary Artery Disease | 979 (27.4) | 592 (25.8) | 387 (30.3) | 0.004 |
| Arrhythmia | 802 (22.4) | 471 (20.5) | 331 (25.9) | <0.001 |
| Dyspnea | 747 (21.4) | 417 (18.6) | 330 (26.3) | <0.001 |
| Hypotension | 382 (10.7) | 207 (9.0) | 175 (13.7) | <0.001 |
| Abnormal ECG | 1948 (55.4) | 1206 (53.4) | 742 (59.0) | 0.001 |
| Physician Risk Assessment, mean (SD) | 9.2 (13.2) | 8.8 (12.5) | 9.8 (14.3) | 0.027 |
Abnormal ECG includes: any non sinus rhythm, left ventricular hypertrophy, bundle branch blocks, or interval prolongation