KB0045: Using Cursors to Delete Multiple R Peaks in the ECG Editor

Sometimes there is artifact in an ECG signal that results in a large number of erroneous R peaks being marked which would take a significant amount of time to delete individually. Luckily there are some tools in the ECG Editor for handling these situations efficiently.


 

Delete All Points Between X Cursors

There are 2 blue vertical lines on the screen called the X Cursors. These cursors can be used to define a time span in which to remove all instances of R Peak markers. Take for example the data segment below:

X Cursors Delete

The beginning of this segment contains so much signal noise that it is impossible to identify the locations of actual R peaks. In addition, the peak detector has falsely identified peaks in the noise as R peaks which need to be removed. Using your mouse to grab and drag the X cursors, place one of them on either side of the noise. Press the Delete All Pts Between X Cursors button to remove all R Peak markers that fall between the X cursors.

X Cursors Post Delete

When deleting spurious R peaks in this way, don’t forget about the different editing techniques for HRV and Impedance Cardiography.


 

Delete All Points Between Y Cursors

Similarly, there are 2 horizontal green lines called the Y cursors. These cursors can be grabbed and dragged into position using the mouse much in the same way as the X cursors, except that these cursors define an amplitude range within which to delete spurious R peak markers.

Y Cursors Delete

This particular ECG has some lower amplitude characteristics which have been falsely identified as R peaks. However it is obvious which of these are actual R peaks, and which are not. The Y cursors should now be positioned so that all erroneously marked R peaks fall between them. Be careful not to set your high Y cursor too high, or you will accidentally delete good R peaks too.

Once the cursors have been positioned, press the Delete All Pts Between Y Cursors button to remove them all.

Y Cursors Post Delete

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