Table 2. Pulmonary Embolism–Related Characteristics in the Emergency Department.
| No. (%) | ||
|---|---|---|
| PERC (n = 962) | Control (n = 954) | |
| Simplified Revised Geneva scorea | ||
| 0 | 281 (29) | 195 (20) |
| 1 | 546 (57) | 577 (61) |
| 2 | 111 (12) | 148 (16) |
| 3 | 22 (2) | 28 (3) |
| 4 | 2 (<1) | 6 (<1) |
| Low risk (<2) | 827 (86) | 772 (81) |
| Intermediate risk (≥2 and <5) | 135 (14) | 182 (19) |
| Wells scoreb | ||
| <2 (Low risk) | 875 (91) | 746 (78) |
| ≥2 and ≤6 (Intermediate risk) | 79 (8) | 178 (19) |
| >6 (High risk) | 8 (1) | 30 (3) |
| PERC scorec | ||
| 0 | 459 (48)d | 364 (38) |
| >0 | 499 (52)d | 590 (62) |
| Tested with D-dimer | 526 (55) | 945 (99) |
| D-dimer <0.5 μg/mL | 183 (35) | 474 (50) |
| CTPA | 129 (13) | 220 (23) |
| PE diagnosed in the ED | 14 (1.5) | 26 (2.7) |
| Subsegmental PE | 1 (7) | 5 (19) |
Abbreviations: CTPA, computed tomography of the pulmonary artery; ED, emergency department; PE, pulmonary embolism; PERC, pulmonary embolism rule-out criteria.
SI conversion for D-dimer: to convert to nmol/L, multiply by 5.476.
a
Simplified Revised Geneva score ranges from 0 (lowest probability of PE) to 9 (highest probability of PE).
b
Wells score ranges from 0 (lowest probability of PE) to 12.5 (highest probability of PE).
c
PERC score ranges from 0 (lowest probability of PE) to 8 (highest probability of PE).
d
PERC score was not assessed in 4 patients in the PERC group.