Collect ECG data. Arrhythmia analysis can only be done after recording data – online (real time) calculations are not available at this time.
Click “Autoscale all channels” button
Make sure “double cursors” are selected.
Click “Advanced” from top menu strip.
Click “ECG Analysis”
Click “Offline Calculations”
Place each cursor on the far left / far right of data shown in top panel.
In the “Channels” tab – select “ECG data” or channel that you are interested in if you are recording more than one lead of ECG.
For “Data Range” decide if you want to analyze the “Selection” (shown at top of screen), the “Current Block” (from start of recording to end of recording of the block shown at the top of the screen), or “Complete File” to analyze the complete data file (including all start and stops in the recording).
In the “Settings” tab
Click “Load Presets” and select your ECG subject (Human, Mouse, Rat, etc…)
Set “Average” to “1 Cycle”
Decide and select the parameters that work for your study.
Look at the top trace – if each ECG cycle is not marked, increase the “Cycle Detection Threshold Sensitivity” to a higher number. Keep increasing the number in that field until each ECG trace is marked with a black line.
The “Group” box will show each ECG cycle.
Click through each cycle and adjust the wave parameters to where you want them by clicking and dragging the blue labeled lines for each ECG wave. NOTE – this is optional and you may not need to do this.
Click “Artifact Removal” tab
Default “Plot” will be “R Amplitude” vs. “Rate”. However, if you are looking for a different parameter, click on the drop down menu next to “Plot” and then click the “Plot” button.
You will get a graph that looks like this:
Adjust the blue box so that is surrounds the lower rate signals or higher rate signals (for arrhythmias that can be differentiated by a difference in rate).
Click the “Calculate” button that is on the lower left of the tab:
Everything outside of the blue box will turn red – meaning that it’s considered an outlier:
The calculations at the bottom of the screen will now be for the beats that are within the parameters set by the blue box.
Repeat the above but set the blue box around the higher rate beat group:
The calculations at the bottom of the screen will now reflect the ECG beats that are higher frequency – in this case PVCs.