The aim of this study is to elucidate the efficacy and safety of pharmacoinvasive therapy by using prourokinase (prouk), a unique fibrin-specific agent, in patients with ST-segment elevation myocardial infarction (STEMI)

Inclusion Criteria:

• age 75 years or younger, symptom onset 6 h or less before randomization, intention to undertake primary PCI, ST-segment elevation of 2 mm or more in two anterior leads or of 1 mm or more in two inferior leads if they had ST-segment elevation, or new left bundle-branch block.

Exclusion Criteria:

• expected arrival at the catheterization laboratory less than 1 h or more than 3 h after randomization, anticipated problems with vascular access, previous enrollment to other studies, and the usual contraindications to thrombolytic therapy.