TABLE 3.
Admission Aspirin Response Unit and P2Y12 Response Unit Results Stratified by Antiplatelet Therapya
| % Therapeutic, ARU | ARU, Mean (SD) | P, ARU | % Therapeutic, PRU | PRU, Mean SD, | P, PRU | |
|---|---|---|---|---|---|---|
| No agent | 52 | 536 (90) | 54 | 229 (76) | ||
| Aspirin only | 87 | 460 (68) | <.001b | 53 | 237 (65) | .54 |
| Clopidogrel only | 63 | 518 (97) | .59 | 73 | 210 (64) | .39 |
| Both agents | 92 | 439 (61) | <.001b | 78 | 185 (72) | .002b |
| Any aspirin (aspirin only + both) | 88 | 456 (67) | <.001b | 65 | 212 (73) | .15 |
| Any clopidogrel (clopidogrel only + both) | 88 | 451 (72) | <.001b | 77 | 191 (70) | .003b |
| Any antiplatelet agent | 87 | 457 (69) | <.001b | 66 | 212 (72) | .14 |
| All patients | 79 | 478 (82) | 62 | 218 (74) |
aARU, aspirin response unit; PRU, P2Y12 response unit.
bIndicates a significant result.
Aspirin-only, clopidogrel-only, and both agent comparisons were made against no agent. For any aspirin, any clopidogrel, and any antiplatelet agent, comparisons were made against patients not taking the particular agent. The Student t test used for all comparisons of assay values.