Table 1.
Characteristics of patients in each group (note that statistical comparison on this table is made only between Apple Watch standby mode and Apple Watch workout mode because of overlaps).
| Demographics | Apple Watch standby mode (n=18) | Apple Watch workout mode (n=22) | Fitbit Charge HR (n=40) |
| Age (years), mean (SD) | 71.0 (11.9) | 70.7 (10.6) | 70.9 (11.1) |
| Male, n (%) | 11 (61) | 16(72) | 27 (68) |
| Left ventricular ejection fraction, mean (SD) | 57.7 (13.2) | 61.1 (10.2) | 59.5 (11.6) |
| Off-pump coronary artery bypass grafting, n (%) | 2 (11) | 5 (23) | 7 (18) |
| Valve surgery, n (%)a | 14 (78) | 13 (59) | 27 (68) |
| Other surgery, n (%)b | 2 (11) | 4 (18) | 6 (15) |
| Postoperative stay, days | 24 (17.5) | 17.5 (8.3) | 20.7 (13.6) |
| Monitoring period, days | 12.4 (2.1) | 10.3 (2.1) | 11.3 (2.7) |
| Use of antiarrhythmic drugs before event, n (%)c | 16 (89) | 22 (100) | 38 (95) |
| Use of antiarrhythmic drugs after event, n (%)d | 18 (100) | 22 (100) | 40 (100) |
aIncluded multiple surgery.
bIncluded 2 thoracic surgeries, 1 atrial septal defect closure, and 3 on-pump beating coronary artery bypass graftings.
cTypes of antiarrhythmic drugs included pilsicainide, amiodarone, verapamil, and beta-blockers.
dTypes of antiarrhythmic drugs included pilsicainide, amiodarone, verapamil, and beta-blockers.