This is the discussion for our Snapshot Case involving a 45 year old female complaining of chest pain.
Here is the 12 lead for review:
As we recall, the patient had complained of “off and on” chest pain radiating to her left arm. Concerning to be sure! In addition, the patient was “pain free” at about the time of this 12 lead ECG.
Many of you astutely recognized the possiblity that this ECG showed the Wellens’ pattern. We know that the Wellens’ pattern typically occurs while the patient is pain free. I was concerned that this was Wellens’ also. I did think the R waves were larger than those I’ve seen in other Wellens’ cases, but.. it sure looked like it could be Wellens’. And after all, our chest pain patient was now pain free!
Here is an example of Wellens’ (second type):
Here is V1-V6 from our patient:
Sure looked like it could be Wellens’. The receiving doc in the ER was also concerned. Don’t you just love catching Wellens!
The patient was admitted, and labs drawn. When I followed up to see how critical the LAD lesion was, I got some interesting news: Troponins came back negative. I do not know the discharge diagnosis, but it was not ACS.
Hmph. What happened?? Wellens’ seemed so straight forward. Why wasn’t this Wellens’? I neeeeded to know!
So, I went to the most logical place for answers: Dr. Stephen Smith of Dr. Smith’s ECG Blog.
Here’s how it went:
Me: Dr. Smith, what are your thoughts on this ECG? I was concerned it was Wellens’…
DS: These are non-diagnostic T waves. Maybe ischemia, maybe not. So this is the person you would rule out with serial trops, then stress.
DS: Or do a CT coronary angiogram.
DS: This would be a good case to post as an example of not-Wellens’ waves.
So it is! I started with a good post about Wellens’, and ended up with a good post about not-Wellens’. Here’s the thing though: I am still not sure why it is not Wellens’, even though I know it is a good example of not Wellens’. I figured I better learn the objective Wellens’ criteria Dr. Smith is using!
ME: When differentiating these from Wellens’ waves, is there an objective criteria you are using?
DS: That’s the problem. There is no objective criterion. It is all my experience.
DS: I can say I have seen hundreds if not thousands of such ECGs which are not due to ACS. Many are. That is why I say non-diagnostic.
DS: When I see a Wellens’ morphology, 80% of the time it really is ACS. Still not 100%.
Wait, What? 80%? I never heard that before! Basically, 1 out of every 5 Wellens’ pattern we catch actually won’t be Wellens’. I’ll admit, I found myself feeling a little lacking in the ECG Jedi Master department:
“These aren’t the waves you’re looking for…”
This Snapshot case left me somewhat unsatisfied. The result was unexpected, and I didn’t feel on solid ground about the ECG. That’s how it goes sometimes with some of our cases. Not the answers we thought we’d get. We’ll just have to roll with it, and march on to the next case.
In closing, a few take home points:
- When I become a full fledged ECG Jedi Master, this ECG will obviously be not-Wellens’.
- In the meantime, we must know that all that wiggles isn’t Wellens’. Even with a good story. Keep your guard up, but also know the limitations.
Thank you to Dr. Smith for again providing his wisdom and invaluable insights. As always, comments welcome!