Hello, Heart attack occurs due to blockage in arteries, so in emergency, injection is given which dissolves the clot in arteries. This injection only partially opens the artery. So after this, one should under angiography and followed angioplasty to open the block completely Also, multiple medicines are given like blood thinners, like aspirin clopidogrel statin like atorvastatin, beta blocker like Metoprolol. One should have healthy lifestyle. Hope this helps you and get back if you have any doubts.