Despite treatment with aspirin a large number of patients suffer a myocardial infarction. It
has been speculated that these patients might be "resistant" to aspirin, and studies have
indicated that this phenomenon is related to a less favourable prognosis. At present, no
international consensus exists on how to measure "aspirin resistance". The purpose of this
study is to compare different methods for detecting "aspirin resistance". A classic but
cumbersome way of evaluating platelet function will be compared to newer, easy-handling
point-of-care tests. We hypothesize that one or more point-of-care tests will prove to be
superior to the classic platelet function test in detecting aspirin resistance.