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What Is a Heart Attack? - Healthline
Heart attacks (myocardial infarctions) are a very common occurrence in the United States. During a heart attack, the blood supply that normally nourishes the heart with oxygen is cut off and the heart muscle begins to die.
http://www.healthline.com/health/heart-attack
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Heart Attack (Myocardial Infarction) - PatientInfo
A heart attack (myocardial infarction) is usually caused by a blood clot, which stops the blood flowing to a part of your heart muscle. You should call for an ambulance immediately if you develop severe chest pain.
http://patient.info/health/heart-attack-myocardial-infarction-leaflet
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Heart Attack - MedlinePlus
Each year over a million people in the U.S. have a heart attack. About half of them die. Many people have permanent heart damage or die because they don't get help immediately.
https://medlineplus.gov/heartattack.html
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Heart Attack (Myocardial Infarction) - MedicineNet
A heart attack results when a blood clot completely obstructs a coronary artery supplying blood to the heart muscle and heart muscle dies.
http://www.medicinenet.com/heart_attack/article.htm
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Heart Attack - Mayo Clinic
Heart attack - Comprehensive overview covers symptoms, causes, treatment of a heart attack.
http://www.mayoclinic.org/diseases-conditions/heart-attack/basics/definition/con-20019520
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Heart Disease: Heart Attack - Health
Expert advice and patient stories on the symptoms of a heart attack, weighing your risk, surprising triggers, treatment options, and more.
http://www.health.com/heart-disease/heart-attack-2
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Heart Attack Symptoms and Warning Signs - Health Central
Information on heart attack warning signals and heart attack symptoms. Learn how a heart attack is identified.
http://www.healthcentral.com/heart-disease/c/42538/179269/heart-symptoms-warning
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Heart Attack Facts and Statistics - CDC
Every year about 715,000 Americans have a heart attack--that's one heart attack every 44 seconds. Get facts about heart attacks from the CDC.
http://www.cdc.gov/heartdisease/heart_attack.htm
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Heart Attack: Understand Your Condition - Cardio Smart
Your heart muscle needs oxygen and nutrients to work as it should. A heart attack (your doctor may call it a myocardial infarction) usually occurs when blood flow to the heart is suddenly cut off.
https://www.cardiosmart.org/Heart-Conditions/Heart-Attack
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Symptoms of a Heart Attack in Women
Whether it's disbelief, lack of awareness or misdiagnosis, dismissing the symptoms of a heart attack can delay critical, life-saving actions. Being able to recognize the warning signs and act quickly, however, can save a life-either yours, or someone you love.
https://www.goredforwomen.org/about-heart-disease/symptoms_of_heart_disease_in_women/symptoms-of-a-heart-attack/
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Myocardial Infarction - Wikipedia, the Free Encyclopedia
Myocardial infarction (MI) or acute myocardial infarction (AMI), commonly known as a heart attack, occurs when blood flow stops to a part of the heart causing damage to the heart muscle.
https://en.wikipedia.org/wiki/Myocardial_infarction
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Warning Signs of a Heart Attack
What are the warning signs of a heart attack? The American Heart Association explains the most common symptoms of heart attack in men and women.
http://www.heart.org/HEARTORG/Conditions/HeartAttack/WarningSignsofaHeartAttack/Warning-Signs-of-a-Heart-Attack_UCM_002039_Article.jsp
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Heart Attack - About Heart Attacks
What is a heart attack, also called a myocardial infarction? What is coronary heart disease and coronary artery disease? The American Heart Association explains the Warning Signs of Heart Attack, Risk of Heart Attack, Symptoms of Heart Attack, Treatment of Heart Attack, diagnosis of heart attack, heart attack resources, heart attack tools, heart attack symptoms, heart attack signs, heart attack warning signs.
http://www.heart.org/HEARTORG/Conditions/HeartAttack/Heart-Attack_UCM_001092_SubHomePage.jsp
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What Is a Heart Attack? - NHLBI, NIH
A heart attack happens when the flow of oxygen-rich blood to a section of heart muscle suddenly becomes blocked and the heart can't get oxygen.
http://www.nhlbi.nih.gov/health/health-topics/topics/heartattack
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Heart Attack: Symptoms, Diagnosis, Treatment, and More - WebMD
What happens before, during and after a heart attack? WebMD explains the causes of heart attacks, which affect 1 million Americans every year, along with symptoms, diagnosis, treatment, and post-heart attack care.
http://www.webmd.com/heart-disease/guide/heart-disease-heart-attacks