方法用对比的方法分析窦律下和心动过速时12导联体表心电图，找出心动过速时逆传P’波在不同导联的位置及与QRS波的关系。
Methods We compared the surface ECG in 12 leads during sinus rhythm with tachycardia, and tried to find the relation between the different locations of retrograde P' wave and QRS complex in all leads.
方法用对比的方法分析窦律下和心动过速时12导联体表心电图，找出心动过速时逆传P’波在不同导联的位置及与QRS波的关系。
Methods We compared the surface ECG in 12 leads during sinus rhythm with tachycardia, and tried to find the relation between the different locations of retrograde P' wave and QRS complex in all leads.
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