This score is used for non-valvular atrial fibrillation and has certain guiding significance for anticoagulant therapy, as follows:

Score ≥2, high risk (annual stroke risk 2.2~15.2%), oral anticoagulant therapy is recommended;

Score = 1, moderate risk (annual stroke risk 1.3%), oral anticoagulant therapy or aspirin can be used;

Score = 0, low risk (annual stroke risk 0%), no antithrombotic therapy or aspirin is needed.

As shown in the figure below, choose an anticoagulant therapy strategy based on the CHADS2 score:

The CHA2DS2-VASc score modifies the CHADS2 score by changing the age ≥75 years from 1 point to 2 points, and adding three risk factors: vascular disease, age 65-74 years, and sex (female), thereby influencing the decision for anticoagulant therapy.