A 73-year-old man is evaluated during a routine examination. He feels well but notes a gradual weight gain of 9.1 kg (20 lb) over the past 5 years. He reports his blood pressure to be around 155/85 mm Hg on several determinations at his local pharmacy. Medical history is significant for mild benign prostatic hyperplasia, gout, and hyperlipidemia. Medications are atorvastatin and as-needed colchicine.

On physical examination, blood pressure is 158/87 mm Hg, pulse rate is 85/min, and respiration rate is 12/min. BMI is 29. Cardiac examination is normal, and the remainder of the physical examination is unremarkable.

Laboratory studies show a normal chemistry panel; a urine dipstick demonstrates no blood or protein.

An electrocardiogram shows no evidence of left ventricular hypertrophy.

Which of the following is the most appropriate next step in management?