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Module title = Tutorial: Axis
Lesson title = Shading the QRS
This is lesson 5 of 5 in this module
Sometimes, the QRS complex is difficult to determine if it is mostly upgoing or mostly downgoing. The most accurate way to determine if the ECG is mostly up-going vs. down-going is to look at the
area under/above the curve
. The 2 images below will help to illustrate this concept.
In the first image, we can see that the blue shaded region is greater than the red shaded region and therefore this QRS is mostly
upgoing
:
In the image below, again, the blue region is greater than the red region, and so this QRS is mostly
downgoing
:
If you really cannot tell which shaded region is greater, then the lead would be isoelectric. The second image above actually looks like the upgoing R wave is taller than the downgoing S wave (especially the 1st and 4th QRS), and if you said "hey man, those are pretty equal", then I would have to agree with you. This example is included to show how it can be difficult to determine up vs. down going portions in some examples.
Lesson 5 of 5
That was the last lesson!