Show me ecg acute STEMI
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anterior STEMI 12 lead ECG classic example wikimedia commons
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Acute STEMI on ECG
Diagnostic Criteria (from Washington Manual & Tintinalli's Emergency Medicine)
ST elevation is measured at the J point in at least 2 anatomically contiguous leads:
| Patient Group | Leads V2-V3 | All Other Leads |
|---|---|---|
| Men > 40 years | ≥ 2 mm | ≥ 1 mm |
| Men < 40 years | ≥ 2.5 mm | ≥ 1 mm |
| Women | ≥ 1.5 mm | ≥ 1 mm |
| Posterior leads (V7-V9) | 0.5 mm | - |
| Right-sided leads (V3R, V4R) | 0.5 mm (1 mm if male <30 yrs) | - |
ST Elevation Morphology in STEMI
The ST segment in ischemia classically shows these shapes:
The convex (tombstone) or straight horizontal pattern is most specific for ischemic ST elevation. Measurement is always taken at the J point (junction of QRS end and ST segment beginning):
Real 12-Lead STEMI ECG
This 12-lead ECG shows an anterior STEMI with marked ST elevation in the precordial leads:
Localization by Leads (Tintinalli Table 49-4)
| Territory | Leads with STE | Culprit Vessel |
|---|---|---|
| Anteroseptal | V1-V3 | Proximal LAD |
| Anterior | V1-V4 | LAD |
| Anterolateral | V1-V6, I, aVL | Proximal LAD |
| Lateral | I, aVL | Diagonal or LCx |
| Inferior | II, III, aVF | RCA (or LCx) |
| Inferolateral | II, III, aVF, V5-V6 | RCA or LCx |
| Posterior | Tall R in V1-V2 (mirror image) | LCx |
| Right Ventricular | II, III, aVF + V3R-V6R | Proximal RCA |
Other Key ECG Features
Reciprocal ST depression - ST depression in leads opposite the infarct zone (e.g., inferior STE + lateral ST depression). This increases specificity for true MI and signals larger territory at risk with worse prognosis.
Hyperacute T-waves - Tall, broad, peaked T-waves are often the earliest STEMI sign, appearing before ST elevation develops.
Pathologic Q waves - Develop later (hours), indicating transmural necrosis:
- In V2-V3: Q wave ≥ 0.02 sec, or QS complex
- Other leads: Q wave ≥ 0.03 sec and ≥ 0.1 mV deep in ≥ 2 contiguous leads
New LBBB - Suggests large anterior MI; use Sgarbossa criteria to diagnose MI in existing LBBB (concordant STE ≥1 mm, concordant STD ≥1 mm in V1-V3, or discordant STE ≥5 mm).
STEMI Equivalents (Do Not Miss)
- Posterior MI: ST depression V1-V3 + tall R waves - place posterior leads (V7-V9) to confirm
- De Winter T-waves: Upsloping ST depression + tall peaked T-waves in V1-V6 = proximal LAD occlusion
- Wellens syndrome: Biphasic or deeply inverted T-waves in V2-V3 = critical LAD stenosis (post-pain ECG)
- aVR elevation: STE in aVR with diffuse ST depression = left main or proximal LAD occlusion
Differential Diagnosis of ST Elevation (NOT STEMI)
Per the Washington Manual, conditions mimicking STEMI include:
| Cardiac | Non-Cardiac |
|---|---|
| Prior MI with aneurysm | Pulmonary embolism |
| Pericarditis | Hyperkalemia |
| Myocarditis | Early repolarization (normal) |
| Aortic dissection | - |
| Brugada syndrome | - |
| Coronary vasospasm (Prinzmetal) | - |
Key tip: Always compare to a prior ECG. Obtaining old ECGs is essential to determine whether changes are new or chronic.
- Washington Manual of Medical Therapeutics, pp. 147-148
- Tintinalli's Emergency Medicine, Table 49-4
Help me interpret this
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The output is being truncated. I can see the image directly - let me use what I can read from the visual and the partial analysis responses to give a thorough interpretation.
Based on my direct visual inspection of the ECG and the data extracted from the machine interpretation panel, here is a full interpretation:
ECG Interpretation
Machine-Reported Measurements
| Parameter | Value |
|---|---|
| Heart Rate | 71 bpm |
| PR interval | 132 ms (normal) |
| QRS duration | 82 ms (normal) |
| QT / QTc | 380 / 420 ms (normal) |
| P/QRS/T axis | 34 / 23 / 68° (all normal) |
| RVS+SV1 | 1.4E3 / 1.24 mV |
| RVS+SV1 | 2.732 mV |
Machine interpretation:
- Sinus rhythm
- "Interpretation made without knowing patient's gender/age"
- Normal ECG
- Date: 2021-09-22
Systematic Lead-by-Lead Analysis
Rate & Rhythm
- 71 bpm - normal rate
- Sinus rhythm - P waves present and upright in I, II, aVF; inverted in aVR (as expected)
- Regular R-R intervals
- PR interval 132 ms - normal (< 200 ms), no first-degree block
QRS Complex
- Duration 82 ms - narrow, normal
- No bundle branch block
- Normal axis (~23°) - no left or right axis deviation
- R-wave progression appears normal in precordial leads (V1-V6 transition zone around V3-V4)
- No pathological Q waves identifiable
ST Segments
- The machine calls this a Normal ECG, which means no significant ST elevation or depression is detected
- Visually, the precordial leads (V1-V6) do not show tombstone ST elevation, hyperacute T-waves, or reciprocal changes that would indicate acute STEMI
- Inferior leads (II, III, aVF) appear without significant ST changes
T Waves
- T-wave axis 68° - normal
- No hyperacute (tall, broad, peaked) T-waves
- No deep symmetric inversions
QT Interval
- QTc 420 ms - within normal limits (normal < 440 ms men, < 460 ms women)
Summary
This ECG is interpreted as normal sinus rhythm with no acute ischemic changes.
The machine has flagged it as a Normal ECG. There is no ST elevation meeting STEMI criteria, no pathological Q waves, no significant ST depression, and no prolonged QT.
Important Caveats
- Gender/age unknown - The machine explicitly notes "interpretation made without knowing patient's gender/age." This matters for ST elevation thresholds (e.g., women require ≥1.5 mm in V2-V3 vs. ≥2-2.5 mm in men).
- Clinical context is everything - A "normal ECG" does not exclude ACS. Up to 6% of MIs present with an initially normal ECG. If the patient has active chest pain, repeat ECGs every 15-30 minutes and obtain troponins.
- STEMI equivalents - Posterior MI, De Winter pattern, and Wellens syndrome can have subtle or no obvious ST elevation - these require clinical correlation.
- This is not a substitute for physician review - Always have a qualified clinician correlate this ECG with symptoms, exam, and biomarkers.
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