How to Test Success of a Renal Denervation

Inclusion Criteria: Male and female patients 18 years to 85 years of age, with a diagnosis of re-sistant hypertension (office sitting blood pressure \>140/90 mmHg and 24-hour blood pressure \>130/80 mmHg in patients treated with at least three antihypertensive drugs including a diuretic) and a clinical indication for a renal denervation. Exclusion Criteria: * Secondary cause of hypertension * Anatomical contraindication to renal denervation (renal artery diameter less than 4 mm or more than 8 mm), multiple renal artery, length to bifurcation less than 2 cm * Heart failure (normal ejection fractions on echocardiography and no clinical signs and symptoms of heart failure). * Alcohol or drug abuse, * Malignancy (unless healed or remission \> 5 years) * Pregnancy * Know allergy to contrast medium * Participation in another study within the last month