Acute myocardial infarct patients with STEMI (ST-elevation on ECG) whom undergo a primary percutaneous cardiac intervention will following the standard treatment , received low dose of Ilomedin and to low dose of standard treatment for another 24 hours.

Inclusion Criteria:

1. Age > 18 years
2. Undergoing primary PCI due to STEMI (TIMI flow I -III before PCI and symptom duration < 12 hours)

6) Following receipt of verbal and written information about the study, the patient must provide signed informed consent before any study data is used.

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Exclusion Criteria:

2) Not able to give informed consent 3) Women with childbearing potential 4) On-going concomitant treatment with K-vitamin antagonists (one bolus dose pre-PCI allowed) 5) Known congenital or acquired coagulopathy and/or thrombocytopathy s 8) Participation in a clinical study and/or another investigational device within the past four weeks prior to Day 1 9) Major surgery or trauma within the past 6 weeks prior to Day 1 10) A blood coagulation disorder (i.e. international normalized ratio [INR] > 2.0, platelet count < 100,000/mm3, or hematocrit < 30%) 11) Renal insufficiency (creatinine > 140 mmol/l) 12) Major procedure related bleeding (TIMI major criteria); GI or urinary tract bleeding prior to inclusion in the trial 13) Known active hepatitis B and/or hepatitis C or HIV 14) Known or suspected hypersensitivity to components of the investigational medicinal product

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