IHD is the main contributing factor behind 7 million deaths around the world. Ischemia is when blood that normally flows to a part of the brain is temporarily restricted. When this happens to the heart it is called Cardiac Ischemia. The sudden restriction of blood going to the heart causes chest pain, or angina, which is actually a warning sign that something bad is about to happen. However, sometimes angina does not happen; this is called a silent heart attack. It is also very easy to mistake some lesser symptoms for heartburn and continue on with the day. About 25% of heart attacks are silent which is often why so many people die. People beyond the age of 60 are most affected, and much like the stroke, if you have history with having heart attacks, you are most likely to get them again.
Source: http://www.therichest.com/
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