Table 2.
Cardiac arrest characteristics by exposure group.
| Variable* | Calcium (n = 234) | No calcium (n = 365) | P-value** |
|---|---|---|---|
| Age (years) | 69.0 ± 22.0 | 70.0 ± 19.0 | 0.3233 |
| Sex | 0.7358 | ||
| Male | 147 (62.8%) | 223 (61.1%) | |
| Female | 87 (37.2%) | 142 (38.9%) | |
| Race | 0.0228 | ||
| Caucasian | 197 (84.2%) | 279 (76.4%) | |
| Other | 37 (15.8%) | 86 (23.6%) | |
| Initial rhythm | 0.253 | ||
| Ventricular fibrillation | 15 (6.4%) | 31 (8.5%) | |
| Ventricular tachycardia | 18 (7.7%) | 34 (9.3%) | |
| PEA | 133 (56.8%) | 206 (56.4%) | |
| Asystole | 52 (22.2%) | 68 (18.6%) | |
| Perfusing rhythm | 1 (0.4%) | 0 (0.0%) | |
| Bradycardia | 9 (3.9%) | 16 (4.4%) | |
| Unknown/undocumented | 6 (2.6%) | 10 (2.7%) | |
| Duration of CPR*** | <.0001 | ||
| Median (IQR) | 26.5 ± 21 | 15 ± 17 | |
| 5–8 min, No. (%) | 9 (3.9%) | 86 (23.6%) | |
| >8 min, No. (%) | 225 (96.2%) | 279 (76.4%) | |
| Location of cardiac arrest | 0.0528 | ||
| General medical floors | 104 (44.4%) | 192 (52.6%) | |
| ICU | 130 (55.6%) | 173 (47.4%) | |
| Bicarbonate | 204 (87.2%) | 168 (46.0%) | <.0001 |
| Hyperkalemia | 51 (22.3%) | 46 (13.1%) | 0.0045 |
*
For categorical variables, column percentages were reported; for continuous variables, median ± IQR were reported.
**
For categorical variables, p-values were based on Chi-squared test with exact p-value from Monte Carlo simulation; for continuous variables, p-values were from Wilcoxon rank sum test.
***
For duration of CPR, p-value based on binary variable.