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Single-Lead mode - a single lead selected from all available leads (except the augmented leads) will
be used for QT measurement. QT measurement will stop if the selected lead becomes unavailable.
To select the mode,
Select the QT numeric to enter the
1
Select QT Lead and select
2
When using the All Leads mode, make sure when you compare QT values that they are based on the
same set of leads.
Changing the lead(s) used for QT measurements will not cause the baseline to be reset.
QT View
QT View
In the
The current waves are shown in the upper half of the window and the baseline waves in a different
color below. The Q and T points are marked with a vertical line. By selecting one of the lead labels at
the top of the window you can highlight the corresponding wave; the other waves are shown in gray.
The underlined lead labels are the leads used for the QT calculation. By selecting the numeric area you
can highlight all underlined leads.
Changing The View To A Single Wave Set
To view one set of waves in a larger scale, you can cycle through the different views,
Select
1
Select
2
Select
3
Setting The QT Baseline
In order to quantify changes in the QTc value, you can set a QTc baseline. For example to assess the
effect of medication on the QT interval you can set the current value as the baseline before you begin
medication. This baseline will then be used to calculate the ΔQTc value.
All
Primary Lead
,
window you can verify that the QT algorithm detects correct Q and T points.
Current
view to see the set of current waves.
Baseline
view to see the set of baseline waves.
Split
view to return to the combined view with current and baseline waves.
5 ECG, Arrhythmia, ST and QT Monitoring
Setup QT Analysis
window.
or one of the available single leads.
149

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