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CHADS2 Score: Stroke Risk Assessment in Atrial Fibrillation

Condition  /   Points

C Congestive heart failure  (Points: 1 )
H: Hypertension: blood pressure consistently above 140/90 mmHg (or treated hypertension on medication)  (Points: 1 )
A: Age geq 75 years  (Points: 1 )
D: Diabetes Mellitus  (Points: 1 )
S2: Prior Stroke or TIA  (Points: 2 )


CHADS2 score:   clinical prediction rule for assessing the risk of stroke in patients with non-rheumatic atrial fibrillation.  The result can be used to determine whether or not treatment is required with anticoagulation therapy or antiplatelet therapy.   A high CHADS2 score corresponds to a greater risk of stroke, while a low CHADS2 score corresponds to a lower risk of stroke. The CHADS2 score was validated by a study of nonrheumatic atrial fibrillation patients aged 65 to 95 who were not prescribed the anticoagulant warfarin.

[1 ] Gage BF, van Walraven C, Pearce L, et al. (2004). "Selecting patients with atrial fibrillation for anticoagulation: stroke risk stratification in patients taking aspirin". Circulation 110 (16): 2287–92.

[2 ] Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ (2001). "Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation". JAMA 285 (22): 2864–70. 

[3 ] Go AS,   Hylek  EM,   Chang Y,  et al.  Anticoagulation Therapy for Stroke Prevention in Atrial Fibrillation: How Well Do Randomized Trials Translate Into Clinical Practice?  JAMA. 2003;290(20):2685-2692


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