What an abnormal EKG looks like is rhythms that are irregular. To read an EKG, you would need to have a medical background. Abnormal EKG's can point to many things including heart attacks.
You can find more information here: ems1.com/columnists/EKG/articles/309944-....
An abnormal EKG reading occurs in the initial stages of a myocardial infarction, or a heart attack, when the T wave is abnormally tall. Heart muscle injury is also shown by an elevated ST segment in the EKG wave. The Q wave portion of the EKG remains abnormal even after the heart attack.
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