MRCP2-1113
A 65-year-old patient with type 1 diabetes presents with hypertension. His blood pressure in clinic is 210/110 mmHg despite treatment with bendroflumethiazide, atenolol and doxazosin.
Investigations demonstrate the following:
Na 136 mmol/L (135-145)
K 3.5 mmol/L (3.5-5.0)
Urea 8.9 mmol/L (3.0-8.0)
Creatinine 132 µmol/L (70-120)
Urinary metanephrines Mets 700 nmol/24 hr (<2000) Normets 3277 nmol/24 hour (<4900) Urinary free cortisol 250 nmol/L (<248) Plasma renin <0.05 mU/L (5.4-60 upright) (5.4-30 after 1 hour rest) Aldosterone 1258 pmol/L (100-450 adults overnight) (100-800 random sample/upright) What is the most likely cause of hypertension in this patient?