MSRA-2400

MSRA-2400

A 58-year-old man has been treated for many years with amlodipine for hypertension. Now this is not adequately controlling his blood pressure, and angiotensin-converting enzyme (ACE) inhibitor treatment is planned. On routine baseline blood tests, prior to commencing treatment, the estimated glomerular filtration rate (eGFR) is 49 ml/min/1.73 m2 (reference range >90 ml/min/1.73 m2).
Which of the following is the most appropriate next step in his management?