... in blood flow to the heart, but causes no damage to the heart muscle itself. It usually only lasts a few minutes and can be relieved by rest and/or medication. With proper treatment, patients may have angina for years without serious complications. However, there is a very real risk that angina can lead to a myocardial infarction, i.e. a heart attack. A heart attack is defined as "Sudden ... interruption or insufficiency of the supply of blood to the heart, typically resulting from occlusion or obstruction of a coronary artery and often characterized by severe chest pain."" (The American...

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• Grade Level: High School

... chambers cause your ventricles to beat too fast. It is almost always associated with heart disease or recent heart attack, and can lead to ventricular fibrillation. Ventricular fibrillation: This type of arrhythmia is considered a medical emergency. Many electrical signals though your heart's lower chambers cause your heart to suddenly quiver uselessly and cease pumping. Most people lose consciousness seconds later and ... of at least 6 genes. Many types of arrhythmias result from old age, and the natural weakening of the heart. Arrhythmias can also develop after a heart attack because...

• Word Count: 2852
• Approx Pages: 11
• Grade Level: High School