After heart attack bnp how long to return to normal and the size of the myocardial infarction area is related to the myocardial infarction, myocardial infarction small patients recover quickly, large area of myocardial infarction can be elevated for a long time. Bnp is an indicator of heart failure, after infarction bnp elevation suggests that myocardial infarction after the emergence of cardiac insufficiency, the higher the value of heart failure symptoms; such as myocardial infarction range, the patient has been actively treated, bnp two or three days can be returned to normal. A small number of patients belong to the large area of myocardial infarction, myocardial contraction rate after myocardial infarction will decline, patients with myocardial infarction after heart failure symptoms will exist for a long time, the bmp level decreases more slowly, some patients may even remain at a high level throughout their lives. Patients who have had a myocardial infarction should be treated positively and go to the hospital quickly to avoid massive myocardial necrosis and open the blood vessels quickly to prevent the occurrence of heart failure.