degree of Ventricular excitability resumptive time, or denote difference degree of Ventricular
Refractory period.
QT dispersion graph is as Fig.6-25.
For increasing precision and reducing error, the system adopts the method that got the mean
value, which was based on the each interval produced in the 3 continuous cardiac cycle. The
result will show on the right of the interface. Using three arrows betwixt the interface to mark the
three continuous heart beats. You can move the heart beat which needs to be measured with the
"left" or "right" key, or adjusting the start or end position of Q, S and T wave of the chosen heart
beat in the left view. Click the left view, by using the up and down key to choose some lead
waveform, the waveform will become green, which shows that you have pitched on the
waveform of the heart beat. Then you can adjust the position of Q, S or T by pressing the "Tab"
key. If the upright line on the waveform is red, showing that you can adjust its position with the
left or right key. The data in the data view on the right will change automatically.
There are two buttons on the toolbar, one is limb lead, and the other is the chest lead. Each of
them stands for several waveforms of leads, which show in the left view. Under the default
situation, it displays the limb 6-lead.
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