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P wave (electrocardiography) : ウィキペディア英語版
P wave (electrocardiography)

The P wave in the ECG represents atrial depolarization, which results in atrial contraction.
== Physiology ==
The P wave is a summation wave generated by the depolarization front as it transits the atria. Normally the right atrium depolarizes slightly earlier than left atrium since the depolarization wave originates in the sinoatrial node, in the high right atrium and then travels to and through the left atrium. The depolarization front is carried through the atria along semi-specialized conduction pathways including Bachmann's bundle resulting in uniform shaped waves. Depolarization originating elsewhere in the atria (atrial ectopics) result in P waves with a different morphology from normal.

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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