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junctional ectopic tachycardia
Junctional ectopic tachycardia (JET) is a rare syndrome of the heart that manifests in patients recovering from heart surgery. It is characterized by cardiac arrhythmia, or irregular beating of the heart, caused by abnormal conduction from or through the atrioventricular node (AV node). In newborns and infants up to 6 weeks old, the disease may also be referred to as His bundle tachycardia.
==Etymology==
Junctional ectopic tachycardia derives its name from the problem it causes. "Junctional" is used as the abnormal tissue driving the ventricular rate is located close junction between the atria and ventricles, known as the AV node. Ectopic (from the Greek ''ektopos'', meaning "out of place") refers to the fact that the ventricles are being triggered by tissue that is not the normal pacemaker tissue within the heart. Tachycardia (from the Greek ''takhys'', meaning "swift", and ''kardia'', meaning heart) means a swift heart rate.〔(【引用サイトリンク】 title=Tachycardia )〕
By this definition, junctional ectopic tachycardia is an abnormally swift heart rhythm due to cells firing within the heart near the AV node.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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