ECGSIM
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leads

The leads pane allows the display of the signals observed by the following lead systems:

  • the standard 12-lead system,
  • a minimap montage of the unweighted nine signals (with WCT reference) observed at the nine electrodes sensing the standard 12-leads,
  • a single lead (position at either of the thorax nodes; WCT reference),
  • a 64-lead BSPM system (WCT reference) and
  • the vector cardiogram according to the Frank lead system.

The time bar (yellow) indicates a selected time instance, which may be changed by a single left mouse click or dragging; see also the interval section; see also the interval section.

For changing the displayed grid: see options/preferences.

Signals

The superposition of up to three of the following ECG signals may be viewed:

  • the measured ones, displayed in blue.
  • the simulated ones based on the initial parameter settings, displayed in white (in black on clipboard copies).
  • the ones simulated with adapted parameter settings (in red).

Coupling / filtering

In the coupling menu, you may choose the type of temporal filtering applied to the simulated ECGs.

  • If you choose baseline correction (the default value) the mean value of the potentials is set such that their values at the beginning of the P wave and at the termination of the T wave are zero.
  • If you choose AC coupling the mean of the potential over time will be set to zero for all leads (as results from AC coupling without baseline correction).
  • If you choose DC coupling no filtering of the ECGs is applied ( the true DC level is shown).

Interval selection

If surface potentials are displayed in the Heart or thorax panes, the vertical yellow line visible in the plots indicates the time instant for which the potentials maps are displayed. The time instant may be set by clicking on the left mouse button within the leads pane.
You may also press the left and right arrow keys to in- and decrease the selected time, and the page up and page down keys for in- and decrements with steps of ten ms. The desired time interval may be selected from the pull-down menu.

Vector cardiogram (VCG)

The VCG is derived from the Frank lead system. Three cross sections of the thorax are shown, drawn through the center of gravity of the ventricular myocardium. The loops shown are the projections of the 3D vector loop onto each of the planes.

Note: The horizontal plane is viewed from the feet.

Scale

The amplitude scale can be changed by scrolling the mouse wheel, or by the arrow up and arrow down keys. To obtain the keyboard input the window needs to have the focus, obtained by a mouse click in the leads pane.

Copying the content of the ECGs pane

The image shown on the leads pane may be copied to the clipboard by selecting Copy from the ECGs menu, or by pressing <Ctrl>-C while the mouse is within the leads pane.
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