A 62-year-old man with long-standing hypertension has a clinic blood pressure of 162/94 mm Hg despite adherence to ramipril 10 mg daily, amlodipine 10 mg daily and chlorthalidone 25 mg daily. All medications are at maximally tolerated doses and he takes them regularly. His renal function is normal, and secondary causes have been excluded. Which term best describes his blood pressure status according to Canadian recommendations?