AwMI ecg

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Anterior Wall MI (AwMI) - ECG

Anatomy and Culprit Vessel

The anterior wall of the left ventricle is supplied by the left anterior descending (LAD) artery. LAD occlusion is the most common cause of anterior STEMI.

Diagnostic Criteria for STEMI (Fourth Universal Definition)

New ST elevation of >1 mm in at least 2 contiguous leads, except V2-V3 where the thresholds are:

Women (any age): ≥1.5 mm
Men <40 years: ≥2.5 mm
Men >40 years: ≥2 mm

Leads and ECG Changes in Anterior MI

Territory	Leads with ST Elevation	Reciprocal Changes
Anterior wall (AwMI)	V1-V4	ST depression in III, aVF
Anterolateral	V1-V6, I, aVL	ST depression in III, aVF
Septal	V1-V2	-
High lateral	I, aVL	ST depression in III, aVF, V1

Sequential ECG Evolution in Anterior MI

1. Hyperacute T waves (earliest sign, within minutes)

Tall, broad-based, asymmetrical T waves in V3-V4
ST segment begins to rise at the J point
Transient - progresses rapidly to overt STE

Fig. 64.1 Hyperacute T waves: Panel A shows broad tall T waves in V3-V4 (hyperacute phase). Panel B (30 min later) shows established ST elevation in V1-V4.

2. ST segment elevation - develops as infarction progresses

Morphology: flat/oblique, convex ("domed"), or "tombstoned"
Concave morphology is atypical for STEMI; more common in BER or pericarditis

3. Q waves - marker of irreversible necrosis

Pathologic Q waves appear within 1 hour but most commonly at 8-12 hours
Persist as permanent markers of prior infarction (may disappear over time)
Presence of Q waves with STE does NOT preclude reperfusion therapy

4. T wave inversions - evolve as MI matures (post-reperfusion or completed infarct)

Anterior Wall STEMI - Classic ECG

Fig. 64.6 Anterior wall STEMI: ST elevation in V1-V4 with obliquely straight morphology. LAD had 90% stenosis.

Anterolateral STEMI - ECG

Fig. 64.7 Anterolateral STEMI: STE in V2-V6, I, and aVL. 100% in-stent thrombosis of LAD.

STEMI-Equivalents / Special Patterns (LAD-related)

Wellens Syndrome

Deep symmetrical T wave inversions (Type A/I) or biphasic T wave changes (Type B/II) in anterior precordial leads (V2-V3)
ST segment isoelectric or minimally elevated (<1 mm); no Q waves
May occur pain-free or with chest pain; may or may not have elevated troponin
Indicates critical proximal LAD stenosis - natural history is progression to anterior STEMI
Stress testing is contraindicated in Wellens syndrome

de Winter Pattern

ST depression (not elevation) at J point with prominent, hyperacute upright T waves in precordial leads
ST elevation in aVR
Associated with proximal LAD occlusion - treat as STEMI-equivalent

aVR Elevation Pattern (Left Main / Proximal LAD)

ST elevation in aVR (>0.5 mV) with widespread ST depression in other leads
~78% sensitive, ~83% specific for left main coronary artery disease
If STE is greater in aVR than V1 → left main; greater in V1 than aVR → proximal LAD

Key Points Summary

Finding	Significance
STE V1-V4	Anterior STEMI (LAD occlusion)
STE V1-V6 + I, aVL	Anterolateral STEMI (proximal LAD or diagonal)
Reciprocal STD in III, aVF	Increases specificity for anterior STEMI
Hyperacute T waves in V3-V4	Earliest sign - may precede overt STE
Deep symmetrical TWI in V2-V3	Wellens syndrome - critical LAD stenosis
J-point STD + tall T waves precordially + STE in aVR	De Winter pattern - proximal LAD STEMI-equivalent
STE in aVR > V1 + diffuse STD	Left main or multivessel disease
Q waves V1-V4	Established/completed anterior infarction

Sources: Rosen's Emergency Medicine, 9th Ed., Ch. 64 (ECG Abnormalities in ACS); Table 64.4 (Regional ST Changes in AMI)

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