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Premature junctional contractions (PJCs) are premature cardiac electrical impulses originating from the atrioventricular node of the heart or "junction." This area is not the normal but only a secondary source of cardiac electrical impulse formation. These premature beats can be seen occasionally in healthy subjects and more commonly in some pathological conditions, typically in the case of cardiac drug toxicity, electrolyte imbalance, mitral valve surgery and cold water immersion.〔Tipton MJ, Kelleher PC, Golden FS Institute of Naval Medicine, Gosport, Hants, UK. Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc (21(3):305-313 ) 〕 If more than two such beats are seen, then the condition is termed junctional rhythm. On the surface ECG, premature junctional contractions will appear as a normally shaped ventricular complex or QRS, not preceded by any atrial complex or P wave or preceded by an abnormal P wave with a shorter distance or interval between the P wave and the QRS. Rarely, the abnormal P wave can follow the QRS.〔(【引用サイトリンク】url=http://ecg.utah.edu/lesson/5-2 )〕 ==See also== * Premature atrial contraction * Premature ventricular contraction 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「Premature junctional contraction」の詳細全文を読む スポンサード リンク
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