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Abstract
Background
Aspirin is the most common drug used for the prevention of arterial thrombosis. However, platelet responsiveness to aspirin is variable among individuals and it is important to detect aspirin resistance to improve clinical outcome. We analyzed the changes of platelet reactivity before and after aspirin treatment. We also investigated the incidence and influencing factors of aspirin resistance in Korean.
Methods
We tested platelet function in 198 patients who had been treated with aspirin in a Korean university hospital, and 59 of these patients were tested for platelet function before and after aspirin treatment. We also analyzed platelet reactivity in 136 patients who had not been treated with aspirin. Platelet function was tested using the VerifyNow Aspirin Assay (Accumetrics, USA). Platelet reactivity was expressed as aspirin reaction unit (ARU) and ≥550 ARU was defined as aspirin resistance.
Results
Platelet reactivity of 136 patients who had not been treated with aspirin was 632.2±46.3 ARU (mean±SD) (range, 462-675). Platelet reactivity of 198 patients who had been treated with aspirin was 472.5±60.0 (338-666) ARU, and 10.1% of patients were aspirin-resistant. The difference of platelet reactivity before and after aspirin treatment was 128.3±68.7 (−40-248) ARU. Hb level was lower and platelet count was higher in aspirin-resistant group than in aspirin-sensitive group (P<0.05).
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Fig. 1.
The distributions of ARU in aspirin resistance assay using VerifyNow Aspirin Assay in 136 patients who were not treated with aspirin (A) and in 198 patients who were treated with aspirin for more than one week (B).
Table 1.
The characteristics of patients according to aspirin sensitivity status
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