Table 1. Baseline population characteristics and outcomes.
| Characteristic | Overall (n=1,054) | Antiplatelet use? | Anticoagulant use? | ||
|---|---|---|---|---|---|
| Yes (n=295) | No (n=759) | Yes (n=147) | No (n=907) | ||
| Age, years | 58 (17) | 65 (13) | 55 (18) | 66 (14) | 57 (17) |
| Female sex | 473 (45) | 133 (45) | 340 (45) | 36 (43) | 410 (45) |
| Shockable rhythm | 386 (37) | 118 (40) | 268 (35) | 63 (43) | 323 (36) |
| Witnessed arrest* | 364 (35) | 136 (58) | 228 (44) | 59 (56) | 305 (47) |
| Bystander CPR* | 193 (26) | 59 (25) | 134 (26) | 32 (30) | 161 (25) |
| Cardiac catheterization | 373 (36) | 130 (44) | 243 (32) | 42 (29) | 331 (37) |
| Pittsburgh Cardiac Arrest Category | |||||
| I | 191 (18) | 77 (26) | 114 (15) | 37 (25) | 154 (17) |
| II | 194 (18) | 56 (19) | 138 (18) | 23 (16) | 171 (19) |
| III | 78 (7) | 26 (9) | 52 (7) | 7 (5) | 71 (8) |
| IV | 495 (47) | 115 (39) | 380 (50) | 66 (45) | 429 (47) |
| Unable+ | 96 (9) | 21 (7) | 75 (10) | 14 (10) | 82 (9) |
| Peak troponin | 0.8 [0.2 – 8.0] | 0.8 [0.2 – 7.1] | 0.8 [0.1 – 8.5] | 0.6 [0.2 – 3.2] | 1.0 [0.2 – 8.6] |
| LV ejection fraction, % | 50 [30 – 55] | 50 [25 – 55] | 55 [35 – 60] | 50 [35 – 55] | 50 [30 – 55] |
| Survived | 417 (40) | 141 (48) | 276 (36) | 63 (43) | 354 (39) |
| Favorable outcome | 274 (26) | 85 (29) | 189 (25) | 27 (18) | 247 (27) |
Data are presented as mean (standard deviation) for normally distributed continuous data, median [interquartile range] for skewed continuous data, and raw number with corresponding percentages for categorical data.
Abbreviations: CPR – cardiopulmonary resuscitation; LV – left ventricle
*
Data only available after November 2009. Frequency data are presented as a percentage of the available denominator (n = 750)
+
Pittsburgh Cardiac Arrest Category cannot be assigned when the neurological exam is confounded by residual sedation, neuromuscular blockade, overdose or severe metabolic disarray.