WASHINGTON - November 1, 2016 - A multicenter randomized trial evaluating the role of embolic protection using the Sentinel device during transcatheter aortic valve replacement (TAVR) found that the device was safe but did not meet the primary efficacy endpoint of reduction in median new lesion volume in protected territories assessed by MRI at 2-7 days. In addition, neurocognitive function was not significantly improved.
Findings from the SENTINEL trial were reported today at the 28th annual Transcatheter Cardiovascular Therapeutics (TCT) scientific symposium. Sponsored by the Cardiovascular Research Foundation (CRF), TCT is the world's premier educational meeting specializing in interventional cardiovascular medicine. The study was also simultaneously published in The Journal of the American College of Cardiology (JACC).
TAVR is an important therapy for high and intermediate-risk patients with severe aortic stenosis (AS). However, strokes remain a concerning complication after TAVR and are associated with increased mortality and morbidity. The Sentinel transcatheter cerebral embolic protection (TCEP) device consists of two filters within a single six French delivery catheter percutaneously placed from the right radial (preferred) or brachial artery over a 0.014" guide wire. The filters are positioned in the brachiocephalic and the left common carotid arteries before TAVR and are withdrawn into the catheter and removed after TAVR. The SENTINEL trial was designed to assess the safety of the device during TAVR and the efficacy in reducing the effects of cerebral embolization.
The prospective multicenter randomized trial included 363 patients with severe symptomatic AS and planned TAVR who were at high risk for surgery at 17 centers in the U.S. and two centers in Germany. Patients were randomized 1:1:1 into a safety arm (TCEP only) and two imaging cohorts, in which patients were randomly assigned to TAVR with TCEP (device arm) or without TCEP (control arm). Blinded diffusion weighted MRI (DW-MRI) and neurocognitive function assessments were performed in the device and control arms. Particulate debris from the extracted filters was studied in the device arm and all patients underwent rigorous neurologic evaluations post-TAVR, at 30 days and at 90 days. The
primary safety end point was the occurrence of major adverse cardiac and cerebrovascular events (MACCE) at 30 days compared to a historical performance goal.
The study found MACCE (7.3%) in the device and safety arms was non-inferior to the performance goal (18.3%, Pnoninferior<0.001) but was not statistically different from the control (9.9%, P=0.41). Despite the finding of histopathologic debris within filters in 99% of patients, which included thrombus, calcification, valve tissue, artery wall and foreign material, all strokes at 30 days were not significantly different in the device and safety arms versus the control arm (5.6% vs. 9.1%, P=0.25). The median total new lesion volume in protected territories was not significantly different in the device arm compared with the control arm (102.8 mm3 vs. 178.0 mm3, P=0.33). However, there were important confounders identified including transcatheter valve type and baseline MRI lesion volume (marker of baseline cerebral disease burden). After adjusting for these factors, embolic protection resulted in reduction of new lesion volume on MRI.
These was no significant improvement in neurocognitive function associated with embolic protection. However, there was a correlation discovered between new lesion volume and neurocognitive decline (P=0.0022).
"Despite not meeting its primary efficacy endpoint, the study does provide evidence of device safety and confirms the high-frequency of embolic debris capture with the Sentinel dual filter neuroprotection therapy," said co-principal investigator Susheel Kodali, MD. Dr. Kodali is Director of the Columbia Structural Heart and Valve Center, Director of the Interventional Cardiology Fellowship Program at the Center for Interventional Vascular Therapy at NewYork-Presbyterian Hospital/Columbia University Medical Center and Associate Professor at Columbia University College of Physicians and Surgeons. "In addition, there are important lessons from this trial which should impact future research on neuroprotection during TAVR."
The SENTINEL trial was funded by Claret Medical. Dr. Kodali disclosed being a consultant for Edwards Lifesciences.
The results of the SENTINEL Trial will be presented on Tuesday, November 1 at 9:00 AM ET in the Main Arena (Ballroom, Level 3) at the Walter E. Washington Convention Center.
About CRF and TCT
The Cardiovascular Research Foundation (CRF) is a nonprofit research and educational organization dedicated to helping doctors improve survival and quality of life for people suffering from heart and vascular disease. For over 25 years, CRF has helped pioneer innovations in interventional cardiology and has educated doctors on the latest treatments for heart disease.
Transcatheter Cardiovascular Therapeutics (TCT) is the annual scientific symposium of CRF and the world's premier educational meeting specializing in interventional cardiovascular medicine. Now in its 28th year, TCT features major medical research breakthroughs and gathers leading researchers and clinicians from around the world to present and discuss the latest evidence-based research in the field.