Calculator: CHA2DS2-VASc risk stratification score for estimation of stroke risk for nonvalvular atrial fibrillation in adults

Total criteria point count:

Ischemic stroke risk (% per year)

CHA₂DS₂-VASc score	Unadjusted^[1]	Adjusted for aspirin^[2]
0	0.2	0.2
1	0.6	0.6
2	2.2	2.5
3	3.2	3.7
4	4.8	5.5
5	7.2	8.4
6	9.7	11.4
7	11.2	13.1
8	10.8	12.6
9	12.23	14.4

Notes

"Unadjusted" rates for ischemic stroke refer to rates not adjusted to account for thromboembolic risk reduction with concurrent aspirin use.^[1] While stroke risk generally increases with higher scores, the study reported a slight decrease in the unadjusted and adjusted stroke rates between scores of 7 and 8. This apparent discrepancy is likely attributable to random variation.
Adjusted stroke rates reflect adjustment for concurrent exposure to aspirin (assuming that aspirin provides a 22% reduction in thromboembolic risk) to estimate the risk of ischemic stroke for patients not treated with aspirin. Actual rates of stroke in contemporary cohorts might vary from these estimates.^[2]
CHA₂DS₂-VASc: congestive heart failure, hypertension, age ≥75 years (doubled), diabetes mellitus, prior stroke or TIA or thromboembolism (doubled), vascular disease, age 65 to 74 years, sex category; MI: myocardial infarction; PAD: peripheral artery disease; TIA: transient ischemic attack.

Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

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All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER.

Topic 99815 Version 10.0

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Clinical criteria
Sex
		Female (1 point)
		Male (0 points)
Age
		≤64 years old (0 points)
		65 to 74 years old (1 point)
		≥75 years old (2 points)
Comorbidities
		Heart failure (1 point)
		Hypertension (documented diagnosis or pharmacologically treated) (1 point)
		Diabetes mellitus (1 point)
		History of stroke, TIA, or thromboembolism (2 points)
		Vascular disease (history of MI, PAD, or aortic atherosclerosis) (1 point)

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Calculator: CHA2DS2-VASc risk stratification score for estimation of stroke risk for nonvalvular atrial fibrillation in adults

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