High blood pressure — hypertension — is the single most treatable risk factor for cardiovascular disease and stroke, the two leading causes of death in the United States. There are already more than a dozen classes of antihypertensive medications. For most patients, combining two or three of these drugs in appropriate doses achieves adequate blood pressure control and dramatically reduces the risk of heart attack, stroke, kidney failure, and premature death.
But for a significant subset — estimated at 10 to 15 percent of all hypertensive patients — blood pressure remains uncontrolled despite taking two, three, or even four medications at maximum tolerated doses. This is called resistant hypertension, and it represents one of the most clinically frustrating situations in internal medicine: a patient taking a handful of pills every day, experiencing their side effects, and still not achieving the blood pressure target that determines their future risk of cardiovascular catastrophe.
