Do you know the difference between a heart attack and cardiac arrest? Both are medical emergencies, but they have very different causes, symptoms, and potential outcomes.\nTo learn more, visit the UPMC Heart and Vascular Institute or call 1-855-UPMC-HVI (876-2484).\nHeart attacks are serious medical emergencies, but it\u2019s possible to survive a heart attack and get back to a normal life. Cardiac\u00a0arrest, meanwhile,\u00a0can cause death within minutes without treatment, so it\u2019s important to understand the difference and get immediate medical help in either case.\nCardiac Arrest or Heart Attack?\nWhat is a heart attack?\nA heart attack happens when blood flow to your heart muscle is blocked. If blood flow isn\u2019t restored quickly, the heart muscle begins to die from a lack of oxygen and scar tissue forms in its place.\nMost heart attacks happen because of atherosclerosis, a condition in which a hard substance called plaque builds up inside your arteries, making them narrow or totally blocked. Plaque may also break open, causing a blood clot to form on the plaque\u2019s surface, which blocks blood flow.\nHeart attack symptoms can include:\n\nPressure, squeezing, fullness, or pain in the center of the chest that lasts more than a few minutes or stops and recurs\nDiscomfort that extends to the shoulders, arms, back, abdomen, jaw, and teeth\nShortness of breath\nSweating\nLightheadedness or fainting\n\nWomen may experience these heart attack symptoms:\u00a0\n\nAbdominal pain that may feel like heartburn or indigestion\nDizziness\nUnusual fatigue\nClammy skin\n\nA heart attack is a medical emergency that can be deadly without treatment. If you think you or someone else is having a heart attack, call 911 right away. Paramedics provide the fastest, safest route to the hospital and are trained to treat you on the way.\nWhat is cardiac arrest?\nCardiac arrest happens when your heart stops beating because of a problem with its electrical system. Without a heartbeat, blood can\u2019t circulate to your other organs, leading to death within minutes.\nIt is possible for a person in cardiac arrest to be brought back to life through the use of an automated external defibrillator (AED) or cardiopulmonary resuscitation (CPR), but immediate treatment is crucial.\nIn most cases, cardiac arrest happens because of ventricular fibrillation, or VFib, which happens when your heart\u2019s bottom chambers beat too fast and in an irregular way. It may also happen because of a heart attack, intense physical stress, genetic disorders, or changes to your heart\u2019s structure.\n\n\n \n\nCardiac arrest symptoms can include:\n\nSudden loss of consciousness\nLack of pulse\n\nCardiac arrest is a medical emergency that is deadly without immediate treatment. If you think someone is in cardiac arrest, call 911 immediately and start CPR. If an AED is available, use it as soon as possible. \nCan a Heart Attack Cause Cardiac Arrest?\nIn some cases, a heart attack can lead to cardiac arrest. The scar tissue that forms as heart muscle dies may affect how your heart\u2019s electrical system works, leading to abnormal signals. This is one of many reasons why it\u2019s so important to get immediate treatment for a heart attack.\nWhat Should I Do in an Emergency?\nIf you think someone is having a heart attack or is in cardiac arrest, call 911 right away.