58 year old female CC: Chest pain – Conclusion

Here’s the conclusion to the 58 year old female with chest pain and left bundle branch block.

To refresh your memory here is the 12-lead ECG.

2010_07_23_Bwm

And for those of you who requested lead V4R.

LBBB_STEMI_V4R

This ECG meets all 3 of Sgarbossa’s criteria to identify acute STEMI in the presence of left bundle branch block.

Sgarbossa

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Keep in mind, it only has to meet one criterion in one lead!

(Please note: One criterion has been modified from its original form. Instead of discordant ST-elevation > 5 mm we are looking for discordant ST-elevation > 0.2 the depth of the S-wave. This is known as the ST/QRS ratio. Credit to Dr. Smith of Dr. Smith’s ECG Blog.)

Angiography revealed 100% occlusion of the LCX and 99% occlusion of the RCA.

Thanks to everyone who commented on the case!

5 Comments

  • akroeze says:

    Thanks so much for this real world example Tom!I have actually made printouts of the graphics you use for the three criteria and taped them to the back cover of my protocol book since for some reason I have a hard time committing them to memory. I encourage others to do the same.I'm not sure how things will go the first time I find one of these though as the patient would not meet my current protocol… so I guess I would be at the mercy of the physician knowing what I'm talking about!

  • Tom B says:

    My pleasure, Alex. I'm amazed it took this long.

  • Do you have a refrencve for the "newer: criteria ST greater than 0.2 of S wave

  • Tom B says:

    Bostonmedic109 -Initially it was 0.25 the QRS complex.For a reference see:Circulation. 2008;118:S_578ACS: Initial Assessment-Old and New ToolsAbstract 551: Ratio of Discordant ST Segment Elevation or Depression to QRS Complex Amplitude is an Accurate Diagnostic Criterion of Acute Myocardial Infarction in the Presence of Left Bundle Branch BlockSince then Dr. Smith has reported on his blog that more cases and further analysis have revealed that using 0.2 increases the sensitivity while maintaining the same specificity.Tom

  • Vrhegyi Mrton says:

    Nice and useful article!:-)

    Any q/Q waves in left-sided leads (I, aVL, V5-6) and other markers of necrosis in LBBB (Cabrera's sign etc.) might also be important, however, can be the result of prior myocardial infarction or atypical form of LBBB.

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EMS 12-Lead

Cardiac Rhythm Analysis, 12-Lead ECG Interpretation, Resuscitation

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Comments
Olivier
Snapshot Case: What Happened?
To support Donovan's analysis, QRS are remarkably thin and eventually consistent with paediatric findings. However, as noted, atrial fibrillation in very young patients are quite rare.
2015-05-28 07:36:54
Donovan
Snapshot Case: What Happened?
Looking back on the dosages, though, it occurs to me: this may be a pediatric patient. If that is the case, then for 50 J to be an appropriate dose for Shock 4 (again, assuming the patient is unstable), they would have to weight 25 kg. If that is the case, then the accidental induction…
2015-05-28 01:46:30
Donovan
Snapshot Case: What Happened?
1) Why convert the first rhythm? (brought up by a couple of commenters) -- As is posted in the initial: "required emergent cardioversion for unstable rapid atrial fibrillation" ... rate is not the determining factor about stability, the presence or absence of signs of shock are (hypotension, acutely altered mental status, ischemic chest pain, usw).…
2015-05-28 01:27:57
Ruud Valkenborg
Snapshot Case: What Happened?
Beautyfull R on T with a unsynchronised ECV. :-)
2015-05-27 07:38:19
george
Snapshot Case: What Happened?
why cardiovert urgently in this case? The first strip shows a "well controlled" heart rate. Cardioversion provoked torsade de points due to unsync administration....... Unnecessary risk taken......when amiodarone or flecainide would do the job "quietly".....
2015-05-27 06:46:53

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