Measurement of QT dispersion

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Figure 1  .

A 12 lead ECG analysed by computer with all leads recorded simultaneously. The tick marks for P and QRS onset and offset as well as T offset are at the same time instants in all 12 leads, displayed here at 50 mm/s. Note that V2 has the earliest QRS onset, which is almost 20 ms earlier than the first detectable QRS activity in most limb leads.