Tachycardia: Overview

Tachycardia is the name for an abnormally fast heartbeat. The opposite, a slow heartbeat is called bradycardia. Tachycardia can also be related to palpitations, where a person becomes aware of the sensation in the chest of an abnormally strong or fast heartbeat. Symptoms associated with a rapid heartbeat may include faintness, dizziness, or shortness of breath. An increased pulse rate can be a normal response to various situations (e.g. fever, anxiety), but can also indicate certain system diseases (e.g. thyroid disease, anemia), or various forms of heart disease (e.g. paroxysmal atrial tachycardia, fibrillation).

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