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正常心脏先有电激动,后有机械性收缩和舒张,进而有节奏地泵出血液,供应全身脏器的代谢需要,心脏电活动的起源点是右上方的一个微小结构——窦房结。在正常成人休息时,窦房结规律地每分钟发出60～100次电脉冲,向整个心脏传布。随着运动,窦房结发出电脉冲频率加快。如果窦房结之外的心脏组织,如心房或心室在窦房结以正常节奏发出电脉冲之前抢先激动,控制心脏的电活动,就会使心脏在没有充分被血液
The normal heart first electrically excited, followed by mechanical contraction and relaxation, and then rhythmically pump the blood to supply the metabolic needs of the body organs, the origin of cardiac electrical activity is a tiny structure at the top right - the sinus node. In the normal adult rest, sinus node regularly issued 60 to 100 times per minute electrical pulse, spread to the entire heart. With exercise, the sinus node sends an electrical pulse faster. If the heart tissue outside the sinus node, such as the atrium or ventricle, preemptively activates before the sinus node emits electrical pulses at normal rhythms, controlling the electrical activity of the heart will cause the heart to fail in the bloodstream