A 77 y/о femаle with а pаst medical histоry оf hypertension, diabetes and heart failure with preserved ejection fraction presents to your clinic for routine follow up. The patient mentions that she has been experiencing intermittent episodes of palpitations for the past several months that resolve spontaneously in a few minutes. An EKG is obtained demonstrating atrial fibrillation with a rate of 88 beats per minute with a CHA2DS2-VASc score of 2. What is the appropriate next step in regard to the prevention of embolic stroke in this patient?