Stroke risk factors are one of those Step questions that feel “too easy”… until they hide the answer in a single word like atrial fibrillation or OCPs and ask you to choose the best next step (anticoagulate? aspirin? carotid endarterectomy?). A fast mnemonic keeps you from missing the big ones under pressure.
The Mnemonic: STROKE RISK (quick-hit, shareable)
Think: “If it helps clots form, breaks vessels, or creates emboli → it’s STROKE RISK.”
S T R O K E R I S K
| Letter | Risk factor | One-liner (USMLE-style) |
|---|---|---|
| S | Smoking | Endothelial dysfunction + hypercoagulability → ↑ ischemic stroke risk. |
| T | Tension (HTN) | #1 modifiable risk factor; causes lipohyalinosis → lacunar infarcts & ICH. |
| R | Ruptured plaque (atherosclerosis) | Carotid atherosclerosis → thromboembolism (often MCA territory). |
| O | Old age | Risk rises steeply with age (nonmodifiable). |
| K | Kardiac sources (A-fib, mural thrombus, valvular disease) | Cardioembolic strokes: sudden onset, “maximal at start,” multiple territories possible. |
| E | Estrogen (OCPs/pregnancy/postpartum) | Estrogen ↑ clotting factors → hypercoagulability (esp. w/ smoking). |
| R | Racing sugar (Diabetes) | Accelerates atherosclerosis + small-vessel disease. |
| I | Inflammation/Infection (endocarditis, vasculitis) | Septic emboli or inflamed vessels → ischemic stroke; think fever + murmur. |
| S | Sick blood (hypercoagulable states: malignancy, APS, Factor V Leiden) | Young stroke? Recurrent clots? Consider thrombophilia/APS. |
| K | Kidney disease (CKD) | Promotes HTN + vascular calcification/atherosclerosis → ↑ stroke risk. |
Mini “Visual” Memory Hook
Picture the word STROKE written across a carotid artery:
- Smoke cloud around it
- Tension gauge (BP cuff) squeezing it
- Ruptured plaque cracking off
- Old calendar pages flipping
- Kardiac embolus shooting from the heart
- Estrogen pill pack nearby
Then underneath: RISK as your “extra credit” causes (DM, inflammation/endocarditis, thrombophilias, kidney disease).
High-Yield Step Add-ons (what questions love to test)
1) Ischemic vs hemorrhagic risk patterns
- Hypertension is a major risk factor for both, but classic associations:
- Ischemic: atherosclerosis, A-fib, diabetes, smoking
- Hemorrhagic: chronic HTN, cerebral amyloid angiopathy (lobar hemorrhage in older adults), anticoagulation
2) A-fib = anticoagulate (usually)
- Nonvalvular A-fib → high cardioembolic risk.
- USMLE angle: if they give A-fib + TIA/stroke history, your prevention brain should jump to anticoagulation (unless contraindicated).
3) Carotid disease clues
- Carotid bruit + focal neuro deficits → consider carotid atherosclerosis.
- Carotid stenosis is a common setup for secondary prevention questions (statin, antiplatelet, risk-factor control; sometimes endarterectomy depending on degree/symptoms—details often Step 2-focused).
4) “Young stroke” red flags (don’t anchor on HTN alone)
If a patient is young or has recurrent events, think:
- Hypercoagulable state (APS, malignancy)
- OCPs + smoking
- Endocarditis (fever, murmur, IVDU, positive blood cultures)
- Arterial dissection (neck trauma, pain, Horner syndrome—especially carotid)
Rapid-Fire Recall (what to say in 10 seconds)
“Big stroke risks: HTN, smoking, diabetes, atherosclerosis, atrial fibrillation/cardioembolism, age, estrogen/OCPs, and hypercoagulable/inflammatory states.”
Micro-Quiz (1-liners)
- Most important modifiable risk factor for stroke? → Hypertension
- Most classically embolic rhythm? → Atrial fibrillation
- OCPs become much riskier with what habit? → Smoking
- Fever + murmur + focal deficits? → Endocarditis → septic embolic stroke