CHADS2 Score for Stroke Risk Assessment in Atrial Fibrillation.

(Estimate ONLY)

CHF (Congestive heart failure)
Hypertension (High blood pressure)
Age >= 75
CHADS 2 Score:
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CHADS 2 score estimates the annual risk of developing a stroke with atrial fibrillation. Anticoagulation with coumadin is recommended if the score is equal to or above 2. One point is given for CHF, hypertension, age greater than 75 and diabetes. Two points are given for prior stroke. Enter the risk factors above to get the annual risk score and to see if anticoagulation is recommended.

First published in 2001, the CHADS-2 index (congestive heart failure, hypertension, age =75 years, diabetes mellitus, stroke) was developed to more accurately predict the risk of stroke in patients with nonvalvular atrial fibrillation.[1] The index was derived by combining risk factors from prior studies and then testing their validity in a cohort of 1773 Medicare-aged patients over 2121 patient years.

Table 1. CHADS2 Score: Stroke Risk Assessment in Atrial Fibrillation

Score CHADS2 Risk Criteria
1 point Congestive heart failure
1 point Hypertension
1 point Age >75 years
1 point Diabetes mellitus
2 points Stroke/transient ischemic attack

Table 2. Treatment Recommendations Based on CHADS2 Score

CHADS2 Score Risk Recommendation
0 Low Aspirin (81-325 mg) daily
1 Intermediate Aspirin (81-325 mg) daily or warfarin (INR 2.0–3.0), based on patient preference
2 or more High (CHADS2 revised) or intermediate (CHADS2 classic) Warfarin (INR 2.0-3.0), unless there are reasons to avoid it

Table 3. CHADS2 Score and Corresponding Annual Stroke Risk

CHADS2 Score Annual Stroke Risk, %
0 1.9
1 2.8
2 4
3 5.9
4 8.5
5 12.5
6 18.2

This is only an estimate of the risk factor for stroke. Consult a doctor for professional advice and do not rely on this calculator estimate only. makes no claims regarding the accuracy or appropriateness, and all calculations should be confirmed and checked. You should consult a qualified professional when answers to important or critical questions are needed.

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