A 72-year-old woman presents to the emergency department with headache and shortness of breath. Her blood pressure is 220/125 mmHg, heart rate 100 beats/min, and she is confused with bilateral papilloedema on fundoscopy. Serum creatinine is 220 µmol/L (baseline 90 µmol/L). There is no chest pain. What is the MOST appropriate immediate blood pressure management strategy?