The heart rate(HR) of tachycardia,interval of A wave to V wave of ostium coronary vein (AVcs)and His bundle(AV H )were measured.

• 心内电生理测定心动过速的频率 (HR)、冠状窦口A波至V波的距离 (AVcs)、His束处A波到V波的距离 (AVH)。