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. If blood flow isn’t restored quickly, the section of heart muscle begins to die.

Heart attack treatment works best when it’s given right after symptoms occur. If you think you or someone else is having a heart attack, even if you’re not sure,

Heart attack

A heart attack is life-threatening. If you think you or anyone else is having a heart attack, you should  for an ambulance immediately.

A heart attack happens when your heart muscle is starved of oxygen-rich blood. This causes damage to your heart muscle  

.What causes a heart attack?

Most heart attacks are caused by coronary heart disease. Coronary heart disease (CHD) is when your coronary arteries (the arteries that supply your heart muscle with oxygen-rich blood) become narrowed by a gradual build-up of fatty material within their walls.

If a piece of this fatty material (atheroma) breaks off it may cause a blood clot (blockage) to form. If it blocks your coronary artery and cuts off the supply of oxygen-rich blood to your heart muscle, this is a heart attack.

You might also hear a heart attack called acute coronary syndrome, myocardial infarction (MI) or coronary thrombosis.

Other rarer causes of a heart attack include spontaneous coronary artery dissection (SCAD) where one or more of the coronary arteries tear. Someone having a heart attack may experience any or all of the following:

• Uncomfortable pressure, fullness or squeezing pain in the center of the chest
• Discomfort or pain spreading beyond the chest to the shoulders, neck, jaw, teeth, or one or both arms, or occasionally upper abdomen
• Shortness of breath
• Lightheadedness, dizziness, fainting
• Sweating
• Nausea

A heart attack generally causes chest pain for more than 15 minutes, but it can also have no symptoms at all. Many people who experience a heart attack have warning signs hours, days or weeks in advance.What to do if you or someone else may be having a heart attack

• Call 112 or your local medical emergency number. Don't ignore or attempt to tough out the symptoms of a heart attack for more than five minutes. If you don't have access to emergency medical services, have a neighbor or a friend drive you to the nearest hospital. Drive yourself only as a last resort, and realize that it places you and others at risk when you drive under these circumstances.
• Chew and swallow an aspirin, unless you are allergic to aspirin or have been told by your doctor never to take aspirin. But seek emergency help first, such as calling 911.
• Take nitroglycerin, if prescribed. If you think you're having a heart attack and your doctor has previously prescribed nitroglycerin for you, take it as directed. Do not take anyone else's nitroglycerin, because that could put you in more danger.
• Begin CPR if the person is unconscious. If you're with a person who might be having a heart attack and he or she is unconscious, tell the 911 dispatcher or another emergency medical specialist. You may be advised to begin cardiopulmonary resuscitation (CPR). If you haven't received CPR training, doctors recommend skipping mouth-to-mouth rescue breathing and performing only chest compressions (about 100 per minute). The dispatcher can instruct you in the proper procedures until help arrives.
• If an automated external defibrillator (AED) is available and the person is unconscious, begin CPR while the device is retrieved and set up. Attach the device and follow instructions that will be provided by the AED after it has evaluated the person's condition

Pain or discomfort in one or both arms, the back, neck, jaw or stomach. Shortness of breath with or without chest discomfort. Other signs such as breaking out in a cold sweat, nausea or lightheadedness. As with men, women's most common heart attack symptom is chest pain or discomfortSomeone having a heart attack may experience any or all of the following:

• Uncomfortable pressure, fullness or squeezing pain in the center of the chest
• Discomfort or pain spreading beyond the chest to the shoulders, neck, jaw, teeth, or one or both arms, or occasionally upper abdomen
• Shortness of breath
• Lightheadedness, dizziness, fainting
• Sweating
• Nausea

A heart attack generally causes chest pain for more than 15 minutes, but it can also have no symptoms at all. Many people who experience a heart attack have warning signs hours, days or weeks in advance.

What to do if you or someone else may be having a heart attack

• Call 911 or your local medical emergency number. Don't ignore or attempt to tough out the symptoms of a heart attack for more than five minutes. If you don't have access to emergency medical services, have a neighbor or a friend drive you to the nearest hospital. Drive yourself only as a last resort, and realize that it places you and others at risk when you drive under these circumstances.
• Chew and swallow an aspirin, unless you are allergic to aspirin or have been told by your doctor never to take aspirin. But seek emergency help first, such as calling 911.
• Take nitroglycerin, if prescribed. If you think you're having a heart attack and your doctor has previously prescribed nitroglycerin for you, take it as directed. Do not take anyone else's nitroglycerin, because that could put you in more danger.
• Begin CPR if the person is unconscious. If you're with a person who might be having a heart attack and he or she is unconscious, tell the 911 dispatcher or another emergency medical specialist. You may be advised to begin cardiopulmonary resuscitation (CPR). If you haven't received CPR training, doctors recommend skipping mouth-to-mouth rescue breathing and performing only chest compressions (about 100 per minute). The dispatcher can instruct you in the proper procedures until help arrives.
• If an automated external defibrillator (AED) is available and the person is unconscious, begin CPR while the device is retrieved and set up. Attach the device and follow instructions that will be provided by the AED after it has evaluated the person's conditionSomeone having a heart attack may experience any or all of the following:
  • Uncomfortable pressure, fullness or squeezing pain in the center of the chest
  • Discomfort or pain spreading beyond the chest to the shoulders, neck, jaw, teeth, or one or both arms, or occasionally upper abdomen
  • Shortness of breath
  • Lightheadedness, dizziness, fainting
  • Sweating
  • Nausea

  A heart attack generally causes chest pain for more than 15 minutes, but it can also have no symptoms at all. Many people who experience a heart attack have warning signs hours, days or weeks in advance.

  What to do if you or someone else may be having a heart attack

  • Chew and swallow an aspirin, unless you are allergic to aspirin or have been told by your doctor never to take aspirin. But seek emergency help first, such as calling 911.
    
  • Take nitroglycerin, if prescribed. If you think you're having a heart attack and your doctor has previously prescribed nitroglycerin for you, take it as directed. Do not take anyone else's nitroglycerin, because that could put you in more danger.
  • If an automated external defibrillator (AED) is available and the person is unconscious, begin CPR while the device is retrieved and set up. Attach the device and follow instructions that will be provided by the AED after it has evaluated the person's condition
    

Deciding to Provide First Aid

    •Some people may be required to perform First Aid while working

•If they are off-duty, they can choose whether or not to provide First Aid

•Providing First Aid may be part of your job description

•Before you provide First Aid, it’s important to ask the ill or injured person if you may help                                               Overview

Heart attacks most often occur as a result of coronary heart disease (CHD), also called coronary artery disease. CHD is a condition in which a waxy substance called plaque builds up inside the coronary arteries. These arteries supply oxygen-rich blood to your heart.

When plaque builds up in the arteries, the condition is called atherosclerosis. The buildup of plaque occurs over many years.

Eventually, an area of plaque can rupture (break open) inside of an artery. This causes a blood clot to form on the plaque's surface. If the clot becomes large enough, it can mostly or completely block blood flow through a coronary artery.

If the blockage isn't treated quickly, the portion of heart muscle fed by the artery begins to die. Healthy heart tissue is replaced with scar tissue. This heart damage may not be obvious, or it may cause severe or long-lasting problems.

Heart With Muscle Damage and a Blocked Artery

Figure A is an overview of a heart and coronary artery showing damage (dead heart muscle) caused by a heart attack. Figure B is a cross-section of the coronary artery with plaque buildup and a blood clot.

A less common cause of heart attack is a severe spasm (tightening) of a coronary artery. The spasm cuts off blood flow through the artery. Spasms can occur in coronary arteries that aren't affected by atherosclerosis.

Heart attacks can be associated with or lead to severe health problems, such as heart failure and life-threatening arrhythmias.

Heart failure is a condition in which the heart can't pump enough blood to meet the body's needs. Arrhythmias are irregular heartbeats. Ventricular fibrillation is a life-threatening arrhythmia that can cause death if not treated right away.

Don't Wait--Get Help Quickly

Acting fast at the first sign of heart attack symptoms can save your life and limit damage to your heart. Treatment works best when it's given right after symptoms occur.

Many people aren't sure what's wrong when they are having symptoms of a heart attack. Some of the most common warning symptoms of a heart attack for both men and women are:

• Chest pain or discomfort. Most heart attacks involve discomfort in the center or left side of the chest. The discomfort usually lasts more than a few minutes or goes away and comes back. It can feel like pressure, squeezing, fullness, or pain. It also can feel like heartburn or indigestion.
• Upper body discomfort. You may feel pain or discomfort in one or both arms, the back, shoulders, neck, jaw, or upper part of the stomach (above the belly button).
• Shortness of breath. This may be your only symptom, or it may occur before or along with chest pain or discomfort. It can occur when you are resting or doing a little bit of physical activity.

Other possible symptoms of a heart attack include:

• Breaking out in a cold sweat
• Feeling unusually tired for no reason, sometimes for days (especially if you are a woman)
• Nausea (feeling sick to the stomach) and vomiting
• Light-headedness or sudden dizziness
• Any sudden, new symptom or a change in the pattern of symptoms you already have (for example, if your symptoms become stronger or last longer than usual)

Not all heart attacks begin with the sudden, crushing chest pain that often is shown on TV or in the movies, or other common symptoms such as chest discomfort. The symptoms of a heart attack can vary from person to person. Some people can have few symptoms and are surprised to learn they've had a heart attack. If you've already had a heart attack, your symptoms may not be the same for another one. 

Quick Action Can Save Your Life: E.C.112

If you think you or someone else may be having heart attack symptoms or a heart attack, don't ignore

Heart Attack Symptoms

Symptoms of a heart attack include:

• Discomfort, pressure, heaviness, or pain in the chest, arm, or below the breastbone
• Discomfort radiating to the back, jaw, throat, or arm
• Fullness, indigestion, or choking feeling (may feel like heartburn)
• Sweating, nausea, vomiting, or dizziness
• Extreme weakness, anxiety, or shortness of breath
• Rapid or irregular heartbeats

During a heart attack, symptoms last 30 minutes or longer and are not relieved by rest or nitroglycerinunder the tongue.

Some people have a heart attack without having any symptoms (a "silent" myocardial infarction). A silent MI can occur in anyone, but it is more common among people with diabetes.