Dankhoff describes a further method helping to cure drug resistant hypertension. In this relatively new catheter-based procedure, nerve fibers of the involuntary nervous system (sympathetic nervous system) in the renal arteries are deactivated using radio waves. This procedure is particularly beneficial for patients who are already receiving three or more antihypertensive drugs and who still do not experience satisfactory blood pressure normalization. Various studies and analyses show a positive effect of the procedure on lowering blood pressure.