Dr. Smith's ECG Blog

SEPTEMBER 26, 2023

Methods and Results Patients with confirmed ST elevation myocardial infarction (STEMI) treated by emergency medical services were included in this retrospective cohort analysis of the AVOID study. There was no association between moderate to severe chest pain on arrival and major adverse cardiac events at 6 months (20% vs. 14%, p=0.12).

STEMI 119

STEMI Coronary Emergency Medical Services OR 119

Dr. Smith's ECG Blog

JANUARY 27, 2024

Old ‘NSTEMI’ A history of coronary artery disease and a stent to the same territory further increases pre-test likelihood of acute coronary occlusion, including in-stent thrombosis. So this NSTEMI was likely a STEMI(-)OMI with delayed reperfusion. Fortunately the patient did not reocclude while awaiting the angiogram.

STEMI 117

STEMI Coronary ACS ED 117

Dr. Smith's ECG Blog

DECEMBER 11, 2023

Recall from this post referencing this study that "reciprocal STD in aVL is highly sensitive for inferior OMI (far better than STEMI criteria) and excludes pericarditis, but is not specific for OMI." For the same reason, you should not delay coronary angiography because pain resolves with morphine. The case continues. Mukherjee, D.,

E-9-1-1 123

E-9-1-1 ACS Coronary STEMI 123

Dr. Smith's ECG Blog

APRIL 22, 2024

Patient still not having chest pain however this is more concerning for OMI/STEMI. Wellens' syndrome is a syndrome of Transient OMI (old terminology would be transient STEMI). A comparison of electrocardiographic changes during reperfusion of acute myocardial infarction by thrombolysis or percutaneous transluminal coronary angioplasty.

Coronary 118

Coronary STEMI ED OR 118

Dr. Smith's ECG Blog

MARCH 27, 2025

Theres ST elevation in V3-4 which meets STEMI criteria, which could be present in either early repolarization, pericarditis or injury. Lets see what happens in the current STEMI paradigm. Emergency physician: STEMI neg but with elevated troponin = Non-STEMI The first ECG was signed off. What do you think?

STEMI 52

STEMI Coronary ACS OR 52

Dr. Smith's ECG Blog

JULY 31, 2020

Their OMI Manifesto details how use of standard STEMI criteria results in an unacceptable level of inaccuracy, in which an estimated 25-30% of acute coronary occlusions are missed! The more leads with suspicious findings — the greater the concern for an acute ongoing event.

STEMI 52

STEMI Coronary EMR ALS 52

Dr. Smith's ECG Blog

DECEMBER 22, 2022

Smith , d and Muzaffer Değertekin a DIFOCCULT: DIagnostic accuracy oF electrocardiogram for acute coronary OCClUsion resuLTing in myocardial infarction. Coronary arteries cannot be assessed because the scan was not gated, but proximal segments of the coronary arteries seem to be open with some contrast. Again nothing diagnostic.

STEMI 52

STEMI EMR Coronary OR 52

Dr. Smith's ECG Blog

SEPTEMBER 3, 2023

More past history: hypertension, tobacco use, coronary artery disease with two vessel PCI to the right coronary artery and circumflex artery several years prior. He reports that this chest pain feels different than prior chest pain when he had his STEMI/OMI, but is unable to further describe chest pain. So it can miss some OMI.

Defibrillator 135

Defibrillator Coronary STEMI CPR 135

Dr. Smith's ECG Blog

DECEMBER 19, 2023

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. This is not the case.

E-9-1-1 127

E-9-1-1 Coronary ACS BLS 127

Dr. Smith's ECG Blog

OCTOBER 8, 2024

Subtle as a STEMI." (i.e., Here is the bottom line of the article: It is widely believed that hyperacute T-waves are a transitional state preceding ST Elevation 1–4 Thus, it is tempting to postulate that early cases of OMI will eventually evolve to STEMI; yet, our data contradicts that notion. This one is easy for the Queen.

OR 123

OR STEMI ICU Coronary 123

Dr. Smith's ECG Blog

APRIL 4, 2023

This patient could have very easily been overlooked, both because the ECG was STEMI negative and because the Q waves were attributed to an “old infarct”. Fortunately, Dr. Cho was not looking for STEMI ECG criteria but for an acute coronary occlusion. OMI or STEMI? As cardiology documented, “possible STEMI.

STEMI 52

STEMI Coronary OR ACS 52

Dr. Smith's ECG Blog

JUNE 17, 2016

Jason was very skeptical of STEMI. Pretest probability: Especially when there is no Chest pain, or there are very atypical symptoms, one should be very suspicious of the diagnosis of coronary occlusion unless the ECG is crystal clear. This also argues against STEMI. He complained of 3 days of diarrhea and abdominal pain.

STEMI 52

STEMI OR Coronary EMS 52

Dr. Smith's ECG Blog

JUNE 5, 2023

Here it is: Obvious Inferior Posterior STEMI (+) OMI. Initial troponin was: 3 ng/L We showed that the first troponin in acute STEMI is often negative in at least 27%. Aside on ECG Research: 20% of Definite diagnostic STEMI (Cox et al.) have perfect coronary flow by the time of angiogram. Clinical history is needed.

STEMI 96

STEMI Coronary Ambulance ED 96

Dr. Smith's ECG Blog

FEBRUARY 13, 2023

There’s inferior ST depression which is reciprocal to subtle lateral convex ST elevation, and the precordial T waves are subtly hyperacute – all concerning for STEMI(-)OMI of proximal LAD. There’s ST elevation I/aVL/V2 that meet STEMI criteria. This is obvious STEMI(+)OMI of proximal LAD. Non-STEMI or STEMI(-)OMI?

STEMI 52

STEMI Paramedic Coronary ALS 52

Dr. Smith's ECG Blog

SEPTEMBER 22, 2023

It does, in fact, the STE meets STEMI criteria since there is 1 mm of in V4 and V5. As discussed above in Dr. Smith's excellent discussion — serial ECGs, correlated to severity of patient symptoms soon confirmed the acute event in today's patient. This ECG was texted to me with no other information. What did I say?

OR 131

OR STEMI Coronary 131

Dr. Smith's ECG Blog

SEPTEMBER 25, 2024

A 56 year old male with a history of diabetes, dyslipidemia, hypertension, and coronary artery disease presented to the emergency department with sudden onset weakness, fatigue, lethargy, and confusion. At 2111, the troponin I peaked at 12.252 ng/mL (this is in the range of STEMI patients, quite high). No ECG was ordered on Day #1.

Coronary 120

Coronary STEMI Emergency Department OR 120

Dr. Smith's ECG Blog

MAY 10, 2023

A CT Coronary angiogram was ordered. Here are the results: --Minimally obstructive coronary artery disease. --LAD Although a lesion is not visible anatomically on this CT scan, coronary catheter angiography could be considered based on Cardiology evaluation." Transient STEMI is at high risk of re-occlusion.

Coronary 52

Coronary STEMI CAD OR 52

Dr. Smith's ECG Blog

SEPTEMBER 5, 2024

Another possible cause of pseudonormalization of T waves mentioned many times on this blog is the pseudonormalization caused by re-occlusion of an infarct related reperfused coronary artery. A mong patients with STEMI, ventricular septal rupture is the most common and free wall rupture is the least common.

STEMI 109

STEMI Coronary OR ALS 109

Dr. Smith's ECG Blog

OCTOBER 22, 2024

"Unfortunately, the cardiologist waited until the next day to refer the patient for angiography and intervention because patient did not meet criteria for "STEMI"." The coronary angiography showed a 100% ostial main (obtuse) marginal occlusion!" Dominant right coronary, atherosclerotic and calcified. Peak troponin: 128,000 ng/L.

Coronary 66

Coronary STEMI OR ALS 66

Dr. Smith's ECG Blog

SEPTEMBER 7, 2024

Smith : there is some minimal ST elevation in V2-V6, but does not meet STEMI criteria. Transient STEMI has been studied and many of these patients will re-occlude in the middle of the night. And dynamic ST-T wave changes between ECG #1 and ECG #2 confirm an acute event in progress. Is it normal STE? This is a "Transient OMI".

STEMI 116

STEMI ACS Critical Care Coronary 116

Dr. Smith's ECG Blog

AUGUST 19, 2023

This is diagnostic of infero-posterior OMI, but it is falsely negative by STEMI criteria and with falsely negative posterior leads (though they do show mild ST elevation in V4R). They were less likely to have STEMI on ECG, and more likely to be initially diagnosed as non-ACS.

STEMI 98

STEMI ACS OR ALS 98

ECG & Echo Learning

JANUARY 18, 2023

This page summarises the most current recommendations for the management of acute coronary syndromes with persistent ST-segment elevations (i.e STEMI , ST-segment elevation acute myocardial infarction ). I B Ambulance personnel must be trained and equipped to identify STEMI and administer fibrinolysis if necessary.

STEMI 40

STEMI Coronary OR Defibrillator 40

Dr. Smith's ECG Blog

JANUARY 9, 2023

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. Repeat CT angio chest (not CT coronary, unclear what protocol) showed possible LAD aneurysm and thrombus. Pericarditis?

Coronary 52

Coronary STEMI Heart Attack OR 52

Dr. Smith's ECG Blog

NOVEMBER 30, 2022

Takotsubo is a sudden event, not one with crescendo angina. Hospital Course The patient was taken emergently to the cath lab which did not reveal any significant coronary artery disease, but she was noted to have reduced EF consistent with Takotsubo cardiomyopathy. An angiogram is a "lumenogram;" most plaque is EXTRALUMINAL!!

Emergency Department 52

Emergency Department E-9-1-1 Coronary STEMI 52

Dr. Smith's ECG Blog

DECEMBER 29, 2015

would require the ST/S ratio to be 25% for diagnosis of STEMI in LVH. The physician was concerned about STEMI, but also worried that she was overreacting, with the potential that LVH was producing a "STEMI-mimic." Can you diagnose an ACO (STEMI) when you also have LVH? The criteria of Armstrong et al. References 1.

STEMI 40

STEMI Coronary ALS CAD 40

EMS 12-Lead

APRIL 2, 2022

He reported a history of ischemic cardiomyopathy with coronary stent placement approximately 10 years prior, but could not recall the specific artery involved. Whether this represents a potential acute cardiac event would depend on the history, comparison with prior tracings and serial tracings. Attached is the first ECG.

ALS 130

ALS STEMI Coronary OR 130

Dr. Smith's ECG Blog

DECEMBER 29, 2023

But because there was no new ST elevation, the ECG was signed off as “STEMI negative” and the patient waited to be seen. But the ECG still doesn’t meet STEMI criteria. It was therefore interpreted as “no STEMI” and the patient was treated with dual anti-platelets and referred to cardiology as “NSTEMI.” the cardiologist 5.

STEMI 70

STEMI Coronary OR ALS 70

Dr. Smith's ECG Blog

NOVEMBER 15, 2013

You've read in my previous posts that I have a lot of evidence that Wellens' represents spontaneously reperfused STEMI in which the STEMI went unrecorded. New ST elevation diagnostic of STEMI [equation value = 25.3 Prevalence of Total Coronary Occlusion during the Early Hours of Transmural Myocardial Infarction.

Coronary 52

Coronary STEMI ALS Emergency Department 52

Dr. Smith's ECG Blog

SEPTEMBER 10, 2023

Post Cath ECG: Obviously completing MI with LVA morphology, and STE that meets STEMI criteria (but pt is still diagnosed as "NSTEMI"). Day 12 ECG: FINAL DIAGNOSIS: "NSTEMI" Despite the fact that his day 4 ECG easily meets STEMI criteria, the patient is diagnosed as NSTEMI. No TIMI flow was listed in the report. Am Heart J.

E-9-1-1 78

E-9-1-1 ACS STEMI Coronary 78

Dr. Smith's ECG Blog

OCTOBER 24, 2019

The biphasic T wave is consistent with recent reperfusion of an occluded coronary artery supplying the inferior region. Here’s the angiogram of the RCA : No thrombus or plaque rupture in the RCA (or any coronary artery) was found. This MI wasn’t caused by a ruptured plaque of CAD - it was a coronary artery dissection of the RCA.

Coronary 52

Coronary CAD ACS STEMI 52

Dr. Smith's ECG Blog

SEPTEMBER 3, 2010

He subsequently had a syncopal event and was down for 1-2 minutes. One might think this represents acute STEMI, or Bundle branch block with discordant ST segments and suspicously concordant T-waves. His wife called 911. EMS found him with an irregular heart rate at 200-250 beats per minute. There is also a wide QRS.

STEMI 52

STEMI Coronary EMS ED 52

Dr. Smith's ECG Blog

JANUARY 28, 2023

Only very slight STE which does not meet STEMI criteria at this time. I am immediately worried that this OMI will not be understood, for many reasons including lack of sufficient STE for STEMI criteria, as well as the common misunderstanding of "no reciprocal findings" which is very common with this particular pattern.

STEMI 52

STEMI ED ACS Coronary 52

Dr. Smith's ECG Blog

AUGUST 6, 2024

It definitely does not fulfill STEMI criteria, and I would argue that it would not lead to cath lab activation in most centers. All coronary arteries were patent without atherosclerotic change. . == Below is the ECG of Patient #2 — as interpreted by the QOH. The ECG is diagnostic of occlusion myocardial infarction (OMI).

Coronary 104

Coronary OR STEMI EMS 104

Dr. Smith's ECG Blog

DECEMBER 13, 2023

Knowing the patient has a history of coronary disease could be relevant to today's case — as it should add to our suspicion of a new acute event. If this is the case — this size of a Qr wave in lead III, as well as the seemingly wide Q in lead aVF — would seem to suggest prior inferior infarction a t some point in the past.

EMR 123

EMR Coronary OR STEMI 123

Dr. Smith's ECG Blog

JULY 22, 2023

A prior ECG from 1 month ago was available: The presentation ECG was interpreted as STEMI and the patient was transferred emergently to the nearest PCI center. The patient proceeded to cath where all coronaries were described as normal with no evidence of any CAD, spasm, or any other abnormality. So maybe she is better than I am.

E-9-1-1 92

E-9-1-1 CAD OR STEMI 92

Dr. Smith's ECG Blog

OCTOBER 24, 2018

This is all but diagnostic of STEMI, probably due to wraparound LAD The cath lab was activated. These include: i ) appreciation of how problematic the definition of “acute STEMI” can be; and , ii ) illustration of how dependence on this definition may result in overlooking acute coronary occlusion.

E-9-1-1 40

E-9-1-1 STEMI ACS Coronary 40

Dr. Smith's ECG Blog

SEPTEMBER 25, 2024

Here is the post shock ECG: Cardiology was called stat for ischemic VT, query SCAD vs thrombotic occlusion vs coronary vasospasm. Cath lab was activated: There was no coronary artery disease, but there was spontaneous coronary artery dissection (SCAD) of the distal LAD, which was narrowed by 95%, and treated medically.

OR 66

OR STEMI ACS Coronary 66