SCAD x AMI.

 Spontaneous Coronary Artery Dissection (SCAD) ECG findings are highly variable and often mimic acute coronary syndrome. There is no single “classic” ECG pattern, which is why SCAD is frequently missed. Below are the key, evidence‑based ECG features drawn from clinical case series and cardiology reviews.

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⚡ SCAD – Key ECG Points

(Synthesized from emergency medicine case reviews and cardiology literature)

Cleveland... +1

1. ST‑segment elevation (STEMI pattern)

• Common in SCAD, especially when the dissection causes severe lumen compression.

• ST elevation often appears in anterior leads (V2–V5) when the LAD is involved.

• May occur without reciprocal ST depression, unlike typical atherosclerotic STEMI.

2. Non‑ST elevation changes (NSTEMI pattern)

• Many SCAD patients show ST depression, T‑wave inversion, or subtle ischemic changes.

• ECG may fluctuate as the intramural hematoma expands or decompresses.

3. Normal or near‑normal ECG

• A significant number of SCAD patients initially present with normal ECGs, despite active dissection.

• This is why symptoms + risk profile (young female, postpartum, stress trigger) are crucial.

4. Dynamic ECG changes

• Serial ECGs may show evolving ischemia:• ST elevation → resolution

• T‑wave inversion developing over hours

• New Q waves if infarction occurs

• These changes reflect the unstable nature of the arterial wall hematoma.

5. Patterns depend on the artery involved

• LAD SCAD: anterior ST elevation or depression.

• RCA SCAD: inferior changes (II, III, aVF).

• Circumflex SCAD: lateral changes (I, aVL, V5–V6).

• Multivessel SCAD may produce mixed patterns.

6. ECG may not correlate with angiographic severity

• Even long dissections can produce mild ECG changes.

• Conversely, small dissections may produce dramatic ST elevation.

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🫀 Why ECG is tricky in SCAD

• SCAD is non‑atherosclerotic, so the ischemic pattern differs from plaque rupture.

• The intramural hematoma compresses the lumen unpredictably.

• ECG findings can change rapidly as the hematoma expands or resorbs.

• Up to 30% of SCAD in women <50 presents like ACS but with atypical ECG patterns.  Emergency Me...

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📌 Clinical takeaway

If a patient—especially a young or middle‑aged woman without classic risk factors—presents with chest pain and any ischemic ECG change, SCAD must be considered.

Diagnosis requires coronary angiography, often supported by OCT or IVUS.

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🔍 If you want next steps

I can give you:

• SCAD ECG examples

• SCAD vs typical MI ECG comparison

• SCAD clinical presentation summary

Which direction would you like, ABHIJIT?