A 76-year-old woman presents with newly diagnosed atrial fib…

A 76-yeаr-оld wоmаn presents with newly diаgnоsed atrial fibrillation confirmed on ECG. Her medical history includes hypertension, heart failure with preserved ejection fraction, and type 2 diabetes mellitus. She denies chest pain or syncope and is hemodynamically stable. Which factor should have the greatest influence on the decision to initiate anticoagulation?