Friday, April 27, 2012

RBBB with dynamic T-waves

56 y/o male who presented with 12/10 severe chest pain starting at 3AM, radiating to his upper back.  He had a history of pulmonary embolism but was no longer on coumadin and states the pain is different.

His baseline ECG from 10 months before is normal.  Here is his initial ECG at 0831:

There is sinus rhythm with RBBB.  There are upright T-waves in V2 and V3, with a slight amount of ST elevation in V3.  In RBBB, T-waves are usually inverted in V2 and V3, with some ST depression. (See ECG below)  Any ST elevation is abnormal.  There is also some STE in lead II, and insignificant STE in III, without any reciprocal ST depression in aVL.

 Here is what V1-V3 should look like in RBBB:
Notice inverted T-waves, discordant to the majority of the QRS (the R' wave is the majority) and a small amount of discordant ST depression

He continued to have severe pain, so more ECGs were recorded, at 0927 and 0942:

There is increasing ST elevation in inferior leads without ST depression in aVL, and dynamic T-waves in V2 - V4.

Not much change from 15 minute prior, but abnormalities are persistent.

Here are V1-V3 from the last 3 ECGs:


It is now clear that  there is cardiac ischemia.  Inferior?  Anterior? Both?  Wraparound?




The patient was very hypertensive and had back pain, so they did a CT of his chest to rule out dissection.  It was negative. 

Because of the dynamic T-waves and crushing chest pain, he went directly to the cath lab where they found an open wraparound LAD with a large dangerous thrombus.

The peak troponin I was only 10 and the patient did well.

Serial ECGs and close attention saved his anterior wall.

Here is the post PCI ECG:
T-waves are still upright.



4 comments:

  1. Two things I have noticed:

    1 - 0943 has precordial leads annotated with r (V3-V6). Was this actually a right sided ECG or are the annotations erroneous?

    2 - I see the dynamic T-wave changes in your comparison of earlier ECGs. However, I suspect V1 and V2 are switched between 0942 and 0943, perhaps in error while the ECG operator was recording right precordials (Or is it correct to invert all precordial leads, IE V2 in place of V1?) Could you confirm the lead placement?

    I ask because V1 at 0942 appears identical to V2 at 0943, and V2 at 0942 appears identical to V1 at 0943.

    Thanks in advance!

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  2. Paulm,

    Well that was embarrassing! I didn't notice that that was a right sided ECG. I couldn't explain those T-wave inversions and was confused. Now it makes sense. So I just deleted that ECG. As for the first 3, there is no lead placement issue. Those are dynamic T-waves and QRS.

    Thanks,

    Steve Smith

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  3. Hi Dr Steve,

    Thank you very much for sharing this case. I noticed that you wrote 'There is increasing ST elevation in inferior leads without ST depression in aVL'.

    Is this a common occurrence (perhaps in the setting of RBBB)? I am under the impression that subtle reciprocal ST depression usually occurs prior to inferior ST elevation. But it's not so in this case, even though ST elevation is increasing. Why?

    Hope to hear from you soon. Thank you.

    ReplyDelete
    Replies
    1. I do not know why there is no reciprocal ST depression in aVL. It is surprising!

      Delete