Description: (Reuters) - Heart attacks are often the first hint that someone has heart disease and they are often fatal the first time.

Here are a few facts about heart attacks and heart disease:

-- Heart disease is the No. 1 killer of men and women in the United States and in most industrialized countries.

-- Nearly 700,000 people die of heart disease in the United States each year, 29 percent of all deaths, according to the U.S. Centers for Disease Control and Prevention.

-- According to the World Health Organization, heart disease, stroke and diabetes accounted for 32 percent of all deaths globally in 2005.

-- A heart attack is also called a myocardial infarction, and is caused when the blood supply to the heart is blocked. A blood clot can do this, or arteries can become blocked by a messy buildup of hardened fat called plaque.

-- More than 1.1 million Americans have a heart attack each year, two-thirds of them men. Almost all of them have heart disease.

-- Symptoms can be