A case of a 64-year-old male with multiple cardiovascular disease risk factors and non-ST segment elevation myocardial infarction complicated by recurrent stent thrombosis is presented. Percutaneous coronary angioplasty with bare metal stent implantation was performed due to critical stenosis of the left circumflex coronary artery. The recovery was complicated by two episodes of stent thrombosis on the 4th and 10th day of in-hospital stay, both treated by subsequent percutaneous coronary interventions. Our hypothesis of resistance to antiplatelet therapy was confirmed by an in vitro test.