Nine-month results of the REFORM study: a prospective, single-arm, multicenter clinical study of the safety and effectiveness of the Formula™ balloon-expandable stent for treatment of renal artery stenosis

Catheterization and Cardiovascular Interventions : Official Journal of the Society for Cardiac Angiography & Interventions
Robert M BersinGary S Roubin

Abstract

To evaluate the 9-month safety and effectiveness outcomes of the Formula™ balloon-expandable renal stent (Cook Medical, Bloomington, IN) for the treatment of atherosclerotic renal artery stenosis (RAS) following suboptimal angioplasty. Atherosclerotic RAS can cause hypertension and ischemic nephropathy. When clinically indicated, an interventional approach with renal angioplasty and stent implantation is the preferred method for revascularization of atherosclerotic renal artery stenoses. The REFORM study is a prospective, multicenter, single-arm study of stent implantation following suboptimal PTRA using the Formula stent. One hundred patients with atherosclerotic ostial renal artery lesions =18 mm in length with a >50% residual stenosis following PTA were enrolled. The primary endpoint was 9-month primary patency. The 9-month primary patency rate was 91.7%. The 9-month major adverse event rate was 2.2%. Mean systolic blood pressure was significantly decreased at follow-up (from 150 ± 21 mm Hg at baseline to 141 ± 21 mm Hg at 9 months; P = 0.003). Mean serum creatinine (SCr) level and mean estimated glomerular filtration rate (eGFR) were not significantly different at 9 months. A clinically meaningful improvement in renal funct...Continue Reading

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