When it comes to treatment for heart attack, minutes matter. Cardiologists have a saying, "Time is myocardium." Simply put, the faster you receive treatment, the more your heart muscle (myocardium) can be preserved and the less damaged your heart will be.
There are two types of heart attack (also known as myocardial infarction, or MI): ST-segment elevation MI and non-ST-segment elevation MI. Each is a life-threatening emergency requiring immediate medical attention.