A heart attack (also known as a Heart Attack) is the death of heart muscle from the sudden blockage of a coronary artery by a blood clot. Coronary arteries are blood vessels that supply the heart muscle with blood and oxygen. Blockage of a coronary artery deprives the heart muscle of blood and oxygen, causing injury to the heart muscle. Injury to the heart muscle causes chest pain and chest pressure feeling. If blood flow is not restored to the heart muscle within 20 to 40 minutes, irreversible death of the heart muscle will begin to occur. The dead heart muscle is eventually replaced by scar tissue.
Classical symptoms of acute Heart Attack include sudden chest pain (typically radiating to the left arm or left side of the neck), shortness of breath, nausea, vomiting, palpitations, sweating, and anxiety (often described as a sense of impending doom). Women may experience fewer typical symptoms than men, most commonly shortness of breath, weakness, a feeling of indigestion, and fatigue. Approximately one quarter of all Heart Attacks is silent, without chest pain or other symptoms.
Although the clinical presentation of a patient is a key component in the overall evaluation of the patient with Heart Attack, many events are either "silent" or are clinically unrecognized, requiring some medical tests. One should visit a cardiologist to evaluate any signs / symptoms related to heart.