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不同导联的ＱＴ间期早已被发现存在差异 ,但一直被视为记录伪差所致 ,而未予重视。 1985年Ｃａｍｐｂｅｌｌ等[1] 发现这些差异存在一定的规律性 ,因而提出了ＱＴ离散度 (ＱＴｄｉｓｐｅｒｓｉｏｎ ,ＱＴｄ)这一概念。直到 1990年才由Ｄａｙ等与Ｃａｍｐｂｅｌｌ[2 ] 首先证明
The QT interval of different lead has been found to be different, but has been considered as the result of recording artifacts, but did not pay attention. In 1985, Campbell et al. [1] found that there was a certain regularity in these differences and proposed the concept of QT dispersion (QTd). It was not until 1990 that Day and Campbell [2] first proved it