An initial proof of principle study was reported in The Lancet (Krum H et al. Lancet 2009;373:1275–81) by Dr Henry Krum (Monash University, Melbourne, Australia) and co-investigators who, using the newly developed Symplicity® catheter system, performed RDN in 45 patients with resistant hypertension (systolic blood pressure [SBP] ≥160 mmHg on three antihypertensive agents); the procedure lasting a median of 38 minutes. The primary end points were office blood pressure (BP) and safety data at one, three, six, nine and 12 months, and patient’s renal angiography and magnetic resonance angiography during follow-up. BP was significantly redu