A myocardial infarction is the obstruction of a coronary artery causing the death of a portion of the heart muscle.
A cardiologist is a doctor who specializes in the diagnosis and treatment of diseases of the heart and blood vessels: the cardiovascular system.
A doctor or family doctor is responsible for diagnosing and prescribing medical treatments to patients. The family doctor refers to patients where a specialist when a specific treatment is required.
Remember that for the proper selection of health professional that treats myocardial infarction you must consider the nature, severity and symptoms you are presenting.