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Printed on 4/21/2026
For informational purposes only. This is not medical advice.
CHADS2 is a historical atrial fibrillation stroke risk model that assigns points for congestive heart failure, hypertension, age >=75, diabetes, and prior stroke/TIA (2 points). It remains useful for educational context and quick baseline risk framing, although modern practice commonly uses CHA2DS2-VASc for finer stratification.
Formula: CHADS2 = CHF (1) + HTN (1) + Age >=75 (1) + Diabetes (1) + Prior Stroke/TIA (2).
Higher CHADS2 scores reflect increasing annual thromboembolic stroke risk in non-valvular atrial fibrillation.
Use this score for quick educational AF stroke risk framing or when reviewing historical literature that reports CHADS2 cohorts.
CHADS2 is less granular than CHA2DS2-VASc and may under-classify risk in some patients. It should not replace full modern risk-benefit assessment.
For related assessments, see CHA₂DS₂-VASc Score, HAS-BLED Score and TIMI NSTEMI.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
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