文档介绍：electrocardiogram
(ECG)
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Electrocardiogram Introduction
The electrocardiogram (ECG or EKG) is a diagnostic tool that measures and records the electrical activity of the heart in exquisite detail.
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Why It Is Done
Find the cause of unexplained chest pain
Find the cause of symptoms of heart disease
Check the heart's electrical activity
Find out if the walls of the heart chambers are too thick
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Check how well medicines are working and whether they are causing side effects that affect the heart.
Check how well mechanical devices
Check the health of the heart when other diseases or conditions are present
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When is an ECG performed?
As part of a routine physical examination or screening evaluation.
As part of a cardiac exercise stress test.
As part of the evaluation of symptoms of chest pain, shortness of breath, dizziness or fainting, or palpitations.
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What conditions may be diagnosed with an ECG?
Abnormally fast or irregular heart rhythms.
Abnormally slow heart rhythms.
Abnormal conduction of cardiac impulses, which may suggest underlying cardiac or metabolic disorders.
Evidence of the occurrence of a prior heart attack (myocardial infarction).
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Evidence of an evolving, acute heart attack.
Evidence of an acute impairment to blood flow to the heart during an episode of a threatened heart attack (unstable angina).
Adverse effects on the heart from various heart diseases or systemic diseases (such as high blood pressure, thyroid conditions, etc.).
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Adverse effects on the heart from certain lung conditions (such as emphysema, pulmonary embolus (blood clots to lung), etc.).
Certain congenital heart abnormalities.
Evidence of abnormal blood electrolytes (potassium, calcium, magnesium).
Evidence of inflammation of the heart or its lining (myocarditis, pericarditis).
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Does it hurt?
No.  There’s no pain or risk associated with having an electrocardiogram.  When the ECG stickers are removed, there may be some minor fort.
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Is it harmful?