A 68-year-old man presents to the emergency department with severe abdominal pain, headache, chest pain, and shortness of breath for the past three days. He has a history of coronary artery disease, asthma, and resistant hypertension diagnosed three months ago. Over the last month, his GFR has rapidly declined. On examination, his blood pressure is 210/115 mmHg, and he has diffuse pulmonary crackles bilaterally. An abdominal bruit is noted on the left side. A chest X-ray shows bilateral fluffy pulmonary infiltrates. Renal artery stenosis is suspected, and renal ultrasound confirms 89% stenosis in the left renal artery and 74% stenosis in the right renal artery. What is the most appropriate next step in management?
