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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?
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.
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.
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.
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.
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.
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.
The commonest causes of MINOCA include: atherosclerotic causes such as plaque rupture or erosion with spontaneous thrombolysis, and non-atherosclerotic causes such as coronary vasospasm (sometimes called variant angina or Prinzmetal's angina), coronary embolism or thrombosis, possibly microvascular dysfunction.
Patients with pulmonary embolism or aortic dissection who have normal variant ST elevation are at high risk of being diagnosed with pericarditis when what they have is far more serious!! normal variant, not pericarditis) A Young Man with Sharp Chest pain (normal variant, not pericarditis) 24 yo woman with chest pain: Is this STEMI?
This ECG is highly concerning for LAD occlusion despite it not showing a STEMI criteria. You can find the variables used to calculate the value on MD calc here: [link] Utilizing Dr. Smith’s Subtle Anterior STEMI Calculator (4-Variable), the value is greater than 18.2 which is concerning for LAD occlusion.
A bedside cardiac ultrasound was recorded: Here is a still image of the echo: The red arrows outline the right ventricle and the yellow arrows outline the left ventricle chamber. It makes pulmonary embolism (PE) very likely. Second: what does the ultrasound tell us about the condition? He was unresponsive to painful stimuli.
for those of you who do not do Emergency Medicine, ECGs are handed to us without any clinical context) The ECG was read simply as "No STEMI." He was started on a heparin drip and CTA of the chest was ordered to rule out pulmonary embolism. Now another, with ultrasound. In fact, Kosuge et al. Accessed May 28, 2024.
The morphology of V2-V4 is very specific in my experience for acute right heart strain (which has many potential etiologies, but none more common and important in EM than acute pulmonary embolism). CT angiogram showed extensive saddle pulmonary embolism. Now another, with ultrasound. On epinephrine and norepinephrine drips."
A bedside cardiac ultrasound was normal, with no effusion. In a series of 18 patients with COVID and ST elevation, 8 were diagnosed with STEMI, 6 of whom had an angiogram and it showed obstructive coronary disease. 12 All STEMI patients had very high cTn typical of STEMI (cTnT > 1.0
50% of LAD STEMIs do not have reciprocal findings in inferior leads, and many LAD OMIs instead have STE and/or HATWs in inferior leads instead. The ECG easily meets STEMI criteria in all leads V2-V6, as well. CT angiogram chest: no aortic dissection or pulmonary embolism. 24 yo woman with chest pain: Is this STEMI?
They recorded this ECG: Obvious inferior STEMI/OMI What else? The patient was found to have an embolic source. Provocative testing is very helpful for this Coronary Thrombus with lysis (one must do optical coherence tomography or at least intravascular ultrasound to find thes non-obstructive plaques that ruptured. He called 911.
Case continued A bedside cardiac ultrasound revealed grossly preserved left ventricular function, no appreciable wall motion abnormality, pericardial effusion, or obvious valvular abnormality. Later in the night, the patient became bradycardic and developed a Mobitz II pattern , but he remained asymptomatic and hemodynamically stable.
The paramedics diagnosis was "Possible Anterolateral STEMI." On arrival in the ED, a bedside ultrasound showed poor LV function (as predicted by the Queen of Hearts) with diffuse B-lines. LAD: type III-IV vessel with a proximal thrombotic or embolic occlusion (TIMI 0 flow). She had no further episodes of VF. Angiogram: 2.
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