Changes

:This article is from the National Heart, Lung, and Blood Institute<ref>National Heart, Lung, and Blood Institute [http://www.nhlbi.nih.gov/health/dci/Diseases/HeartAttack/HeartAttack_WhatIs.html]</ref>  See that web site for the figures that accompany the text.

:This article is from the National Heart, Lung, and Blood Institute<ref>National Heart, Lung, and Blood Institute [http://www.nhlbi.nih.gov/health/dci/Diseases/HeartAttack/HeartAttack_WhatIs.html]</ref>  See that web site for the figures that accompany the text.

A '''heart attack''' occurs when [[blood]] flow to a section of [[heart]] muscle becomes blocked. If the flow of blood isn’t restored quickly, the section of heart [[muscle]] becomes damaged from lack of [[oxygen]] and begins to die.

A '''myocardial infarction''' (also called a '''heart attack''') occurs when [[blood]] flow to a section of [[heart]] muscle becomes blocked. If the flow of blood isn’t restored quickly, the section of heart [[muscle]] becomes damaged from lack of [[oxygen]] and begins to die.

Heart attack is a leading killer of both men and women in the [[United States]]. But fortunately, today there are excellent treatments for heart attack that can save lives and prevent disabilities. Treatment is most effective when started within 1 hour of the beginning of symptoms. If you think you or someone you’re with is having a heart attack, call 9–1–1 right away.

Heart attack is a leading killer of both men and women in the [[United States]]. But fortunately, today there are excellent treatments for heart attack that can save lives and prevent disabilities. Treatment is most effective when started within 1 hour of the beginning of symptoms. If you think you or someone you’re with is having a heart attack, call 9–1–1 right away.