Remove Embolism Remove STEMI Remove Ultrasound
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Acute artery occlusion -- which one?

Dr. Smith's ECG Blog

The conventional machine algorithm interpreted this ECG as STEMI. In patients with narrow QRS ( not this patient), this pattern is highly suggestive of acute pulmonary embolism. Answer : Bedside ultrasound! Smith : RV infarct may also have this appearance on ultrasound. Her ECG is shown below: What do you think?

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Inferior and Posterior STEMI. What else?

Dr. Smith's ECG Blog

The following ECG was recorded: There is an obvious acute inferior STEMI. Whenever there is inferior STEMI, one should think about Right Ventricular STEMI (RVMI). As 85% of inferior STEMI are due to RCA occlusion [the rest due to occlusion of a "dominant" circumflex (i.e., and STE in lead III > STE in lead II.

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Two patients with chest pain and RBBB: do either have occlusion MI?

Dr. Smith's ECG Blog

The prehospital and ED computer interpretation was inferior STEMI: There’s normal sinus rhythm, first degree AV block and RBBB, normal axis and normal voltages. Smith comment: before reading anything else, this case screamed pulmonary embolism to me. The prehospital, ED computer, and final cardiology interpretation was STEMI negative.

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What does the angiogram show? The Echo? The CT coronary angiogram? How do you explain this?

Dr. Smith's ECG Blog

The problem is difficult to study because angiographic visualization of arteries is not perfect, and not all angiograms employ intravascular ultrasound (IVUS) to assess for unseen plaque or for plaque whose rupture and ulceration cannot be seen on angiogram. Thus, intracoronary imaging modalities are crucial in this setting. From Gue at al.

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A 60-something with Syncope, LVH, and convex ST Elevation

Dr. Smith's ECG Blog

This meets "STEMI criteria" However, there is very high voltage, with a very deep S-wave in V2 and tall R-wave in V4. The morphology is not right for STEMI. My interpretation: LVH with secondary ST-T abnormalities, exaggerated by stress, not a STEMI. This is very good evidence that the ST elevation is not due to STEMI.

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1 hour of CPR, then ECMO circulation, then successful defibrillation.

Dr. Smith's ECG Blog

This is a troponin I level that is almost exclusively seen in STEMI. So this is either a case of MINOCA, or a case of Type II STEMI. If the arrest had another etiology (such as old scar), and the ST elevation is due to severe shock, then it is a type II STEMI. I believe the latter (type II STEMI) is most likely.

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Upon arrival to the emergency department, a senior emergency physician looked at the ECG and said "Nothing too exciting."

Dr. Smith's ECG Blog

This case was provided by Spencer Schwartz, an outstanding paramedic at Hennepin EMS who is on Hennepin EMS's specialized "P3" team, a team that receives extra training in advanced procedures such as RSI, thoracostomy, vasopressors, and prehospital ultrasound. Takotsubo is a sudden event, not one with crescendo angina.

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