Sounds like the Left Anterior Descending is blocking or blocked. As Jon states, the treatment depends on the severity. A patient could be put on just medication, stented or recommended for bypass surgery.
Have you been diagnosed with a septal MI? This is a heart attack that causes damage to the wall separating the chambers of your heart and would present with all the classic symptoms and signs as any other heart attack, chest pain with exertion, shortness of breath, excessive sweating ect.
The treatment would depend on the source, location and severity of the blockage causing the MI. Again, is this a speculation on your part or have you been diagnosed? If so, what are the findings from your cardiologist?
Hope this helps,
Jon