A 75-year-old man with a history of hypertension presents to you for evaluation of intermittent episodes of dizziness over the past several days. He is currently without any dizziness and notes no chest pain, shortness of breath, or focal weakness/numbness.
His blood pressure today is 160/80 mm Hg. Physical examination is unremarkable except for tachycardia. He is on hydrochlorothiazide for hypertension.
Electrocardiography (ECG) is obtained (see Figure).
Based on the information provided, what would be the best next step in the management of this patient's condition?
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