Renal Artery Denervation as a Novel Approach to Treating Resistant Hypertension

Resistant hypertension is a condition in which blood pressure remains uncontrolled despite the use of at least three antihypertensive drugs—one of which must be a diuretic—at maximum tolerated doses and in an appropriate combination. In Poland, it is estimated that the percentage of patients with this condition may reach 10–13% of the general population of individuals with hypertension. These patients have a higher risk of complications, such as strokes or cardiovascular diseases, compared to patients with controlled hypertension. A thorough medical history, physical examination, and laboratory tests form the foundation of diagnosis, which must be approached from multiple angles to exclude pseudo-resistant hypertension or secondary causes. The sympathetic nervous system plays an important role in the pathophysiology of resistant hypertension: its increased activity contributes to persistently high blood pressure values. First-line treatment includes lifestyle modifications and combination drug therapy. When pharmacological therapy fails to bring the expected results, an innovative procedure—renal artery denervation—may be considered. By ablating the afferent and efferent fibers of the sympathetic nervous system, sympathetic tone is reduced, leading to a reduction in blood pressure. Patient selection involves a series of specialized tests. The previously conducted Symplicity HTN-1 and Symplicity HTN-2 studies show a significant reduction in blood pressure after the denervation procedure. Ongoing studies aim to gather more information on the effects and outcomes of renal artery denervation.