Another 40-something with intermittent chest pain

I was sent this ECG by a resident from elsewhere, with the following information:

“Young previously healthy man with several 10-20 minute episodes of chest pain over the past few hours, asymptomatic on presentation and during this ECG.”


“What do you think?”

There are Q-waves in V2 and aVL.  The T-wave in V2 is too large for this Q to be due to old MI.  There is minimal STE in aVL and a proportionally large T-wave, with a reciprocally large T-wave in lead III and a biphasic down-up T-wave in aVF.
There is some STE in V2 and V3, but this cannot be called normal variant because there is a Q-wave in V2 and poor R-wave progression.
All of these are very worrisome for LAD or D1 ischemia.

Here is my response:

“Old MI with superimposed LAD or First Diagonal acute ischemia.  Q-wave in V2, aVL suggest old MI, but T-wave is too large in both to be old.  Alternative is subacute MI of these vessels.”


“Please send info.”



Case:

This is a 40-something who complained of several 10-20 minute episodes of chest pain over the previous few hours.  He had no prior medical history, but is a smoker with a positive family history of CAD.  He arrived at 7:30 pain free and had this ECG recorded at 7:32.  I will repost it here:

See above description

The first troponin was undetectable (cTnT, < 0.01 ng/mL) and he was sent to the observation unit for serial troponins without recording any more ECGs.

Smith comment: this is not acceptable.  One should at least perform many serial ECGs to look for either resolution or evolution of these T-waves.  Since his pain had resolved and was still gone, one would expect resolution of the large T-waves and minimal ST elevation and this would be diagnostic.

Case continued:

At 8:30 he complained that his pain was returning and another ECG was recorded at 8:42:

This is slightly BETTER than the previous  There are smaller T-waves, and less STE in aVL, and the reciprocally inverted T-wave in III is not as deep.  The down-up T-wave in aVF is now all up.
This ECG represents dynamic ACS

Proving that serial ECGs recorded in the ED would have shown resolution of the T-waves.  

–Now they are growing larger from what would have been seen on an intervening ECG 

The ECG was interpreted as No Change.

Case continued:

At 8:50 he had “seizure like activity” that resolved (probably an episode of pulseless VT) and was moved to the ICU, where he had this ECG:

Obvious proximal LAD occlusion (STEMI)

Here is his next 12-lead:

Ventricular Fibrillation is not supposed to be captured on a 12-lead ECG!

This is after defibrillation and the patient had a pulse and was awake:

Slow and sick!  Take me to the cath lab!!

This was recorded just before he was taken to the cath lab:

Here is the angiogram:

Proximal LAD occlusion

Here annotated with arrows:

Learning Points:

1. Real ECG findings of coronary occlusion can be extremely subtle!
2. Learn to recognize hyperacute T-waves.
3. Learn to recognize down-up T-waves
4. Learn to recognize the reciprocity between aVL and III
5. Troponins are not reliable for diagnosis of early ischemia/occlusion
6. There is still a role for observation!

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