In the CHADS2 Index for the stroke risk score for AF, the "A" stands for:

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The "A" in the CHADS2 Index stands for "Age greater than or equal to 75 years." The index assigns one point for each of the following factors: Congestive heart failure, Hypertension, Age greater than or equal to 75 years, Diabetes mellitus, and prior Stroke or transient ischemic attack. The higher the score, the higher the risk of stroke in patients with AF.

In the CHADS2 Index for the Stroke Risk Score for AF