A64-year-old african american female presents to the clinic for evaluation of her hypertension, which she has had for several years. in the past she had been taking hydrochlorothiazide and lisinopril, with little effect on her blood pressure management. at today’s visit, she has no complaints and feels well. her vitals show t m 96.6, p 85, r 18, bp 191/99. she has no jugular venous distention seen on the neck exam, her lungs are clear, and cardiac exam has a regular rate and rhythm without murmur or gallop. her abdomen is soft, non-tender, and a bruit is appreciated at the mid-abdomen just a few centimeters below the epigastric region. there is no fullness or enlargement of the abdominal aorta on palpation. based on the history and clinical findings, what is the most appropriate next test for this patient?