A 62-year-old woman is admitted to the hospital after sustaining a severe left hemispheric ischemic stroke, She was last known to be normal 10 hours ago. She has hypertension but no history of cardiac diseases. On examination, BP 190/105 mmHg, HR 80/min, and RR 16/min. She has right hemiparesis, right facial droop, aphasia, and dysarthria with normal cardiovascular examination. A CT scan shows ischemic changes that occupy most of the left middle cerebral artery territory Electrocardiogram and chest radiograph show normal findings Which of the following is the most appropriate treatment of her high BP at this time?