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心电图V_1导联双相P波起始段直立部分的振幅和时间的积(附图)称为“PV_1起始指数”(Initial PV_1 Index,IPIV_1),代表水平面右心房除极向量面积。测定此项指标的意义和测定P波的最高振幅意义相
The product of the amplitude and time of the upright portion of the biphasic P wave in the electrocardiogram V_1 lead (the figure) is called the Initial PV_1 Index (IPIV_1) and represents the area of the right atrium depolarization vector in the horizontal plane. Determine the significance of this indicator and determine the meaning of the maximum amplitude of P wave phase