Early treatment for a Heart Attack can prevent or limit damage to the heart muscle. Acting fast, at the first symptoms of a heart attack, can save your life. Medical personnel can begin diagnosis and treatment even before you get to the hospital. Certain treatments usually are started right away if a heart attack is suspected, even before the diagnosis is confirmed. These include: Oxygen therapy Aspirin to thin your blood and prevent further blood clotting Nitroglycerin to reduce your heart's workload and improve blood flow through