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Atrial tachycardia is a type of atrial arrhythmia in which the heart's electrical impulse comes from ectopic atrial pacemaker, that is to say an abnormal site in the upper chambers of the heart or atria, rather than from the SA node which is the normal site of origin of the heart's electrical activity. Atrial tachycardias can exhibit very regular rates ranging typically from 140–220 bpm.〔(UCSF Benioff Children's Hospital: Atrial Tachycardia )〕 As any other form of tachycardia, the underlying mechanism can be either the rapid discharge of an abnormal focus, the presence of a ring of cardiac tissue that gives rise to a circle movement - reentry - 〔Curr Opin Cardiol. 2001 Jan;16(1):1-7. Basic mechanisms of reentrant arrhythmias. Antzelevitch C. 〕 or a triggered rapid rhythm due to other pathological circumstances as would be the case with some drug toxicities - digoxin toxicity. One form is multifocal atrial tachycardia. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Atrial tachycardia」の詳細全文を読む スポンサード リンク
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