By Tyler MacDonald WATCH RELATED VIDEO Submit Long-term treatment with the blood thinner warfarin has been linked to dementia in both patients with atrial fibrillation (AF) and those without it. Advertisement © 2017 HNGN, All rights reserved. Do not reproduce without permission. Advertisement 0 COMMENTS CLOSE COMMENT Get HNGN's Top Stories Newsletter Everyweek You have already subscribed. Thank you.