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  • Title: Symplicity multi-electrode radiofrequency renal denervation system feasibility study.
    Author: Whitbourn R, Harding SA, Walton A.
    Journal: EuroIntervention; 2015 May; 11(1):104-9. PubMed ID: 25982652.
    Abstract:
    AIMS: The aim of this study was to test the safety and performance of the Symplicity™ multi-electrode radio-frequency renal denervation system which was designed to reduce procedure time during renal denervation. METHODS AND RESULTS: The multi-electrode radiofrequency renal denervation system feasibility study is a prospective, non-randomised, open label, feasibility study that enrolled 50 subjects with hypertension. The study utilises a new renal denervation catheter which contains an array of four electrodes mounted in a helical configuration at 90 degrees from each other to deliver radiofrequency energy simultaneously to all four renal artery quadrants for 60 seconds. The protocol specified one renal denervation treatment towards the distal end of each main renal artery with radiofrequency energy delivered for 60 seconds per treatment. Total treatment time for both renal arteries was two minutes. The 12-month change in office systolic blood pressure (SBP) and 24-hour SBP was -19.2±25.2 mmHg, p<0.001, and -7.6±20.0 mmHg, p=0.020, respectively. There were three patients with access-site complications, none of which was related to energy delivery; all were treated successfully. No new renal artery stenosis or hypertensive emergencies occurred. CONCLUSIONS: The Symplicity multi-electrode radiofrequency renal denervation system was associated with a significant reduction in SBP at 12 months and minimal complications whilst it also reduced procedure time. TRIAL REGISTRATION: NCT01699529.
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