Table 1.
Baseline characteristics
| Variables | Non-event patients n = 24,618 |
Cardiac arrest patients n = 1054 |
P-value |
|---|---|---|---|
| Male, n (%) | 13,072 (53.1) | 558 (52.9) | 0.888 |
| Age, year (mean (sd)) | 60.67 (16.69) | 72.37 (13.24) | < 0.001 |
| Admission to ICU, n (%) | 279 (1.1) | 638 (60.5) | < 0.001 |
| Emergent admission, n (%) | 10,491 (42.6) | 800 (75.9) | < 0.001 |
| Admission division, n (%) | < 0.001 | ||
| Cardiovascular | 13,836 (56.2) | 760 (72.1) | |
| Cerebrovasclar | 2474 (10.0) | 142 (13.5) | |
| Respiratory disease | 810 (3.3) | 63 (6.0) | |
| Other internal medicines | 2934 (11.9) | 64 (6.1) | |
| Major surgery | 4306 (17.5) | 18 (1.7) | |
| Others | 258 (1.0) | 7 (0.7) | |
| Length of stay, day (mean (sd)) | 9.34 (15.20) | 54.35 (114.36) | < 0.001 |
| Heart rate, bpm (mean (sd)) | 74.57 (17.76) | 93.43 (27.91) | < 0.001 |
| PR interval, msec (mean (sd)) | 172.03 (31.72) | 170.65 (41.28) | 0.262 |
| QT interval, msec (mean (sd)) | 406.41 (47.17) | 393.70 (71.65) | < 0.001 |
| QTc (mean (sd)) | 445.79 (38.02) | 474.27 (46.81) | < 0.001 |
| QRS duration, msec (mean (sd)) | 97.25 (19.25) | 107.62 (28.58) | < 0.001 |
| P wave axis (mean (sd)) | 43.20 (31.26) | 44.89 (47.43) | 0.190 |
| R wave axis (mean (sd)) | 36.14 (46.52) | 39.15 (75.26) | 0.046 |
| T wave axis (mean (sd)) | 51.17 (59.34) | 86.39 (92.21) | < 0.001 |