Sentinel System Shown to Protect the Vast Majority of Brain Regions from Risk of Cerebral Infarcts; Reduces Number and Volume of Brain Lesions by More Than 50 Percent
SAN FRANCISCO and SANTA ROSA, Calif. – October 14, 2015 – Claret Medical™, an innovator in cardiovascular cerebral protection, today announced results from the MISTRAL‐C study showing the first definitive cognitive benefit from use of the Sentinel™ Cerebral Protection System (CPS) during transcatheter aortic valve replacement (TAVR). Data show that unprotected patients have a statistically significant (p=0.017) worsening in cognition when compared to Sentinel-protected patients at five days post‐TAVR, when assessed using the Mini Mental State Exam (MMSE).
Results from the multi‐center, randomized, controlled MISTRAL‐C study were presented in an oral presentation today at the Transcatheter Cardiovascular Therapeutics (TCT) annual meeting by Principal Investigator Nicholas van Mieghem, MD, Thoraxcenter, Erasmus Medical Center, Rotterdam.
MISTRAL‐C also validates findings from the landmark CLEAN‐TAVI study that showed the use of a Claret Medical cerebral protection system reduced the number and volume of brain lesions in TAVR patients.1 MISTRAL‐C showed a 52 percent reduction in the median total new lesion volume at five days post‐procedure as assessed using highly sensitive 3‐Tesla brain MRI. None of the protected patients had National Institute of Health Stroke Scale (NIHSS) deterioration at five days post‐procedure, while five percent of unprotected patients showed deterioration.
MISTRAL‐C studied 65 patients enrolled at four centers in the Netherlands that underwent TAVR using both self‐expanding and balloon‐expandable valves, with and without the use of the Sentinel CPS. The study compared the median total new lesion volume as detected by DW‐MRI at five days post‐procedure to pre‐procedural baseline cerebral scans. It also included a detailed neurological and cognitive assessment of patients five days post‐procedure.
“What is clear in MISTRAL‐C is that patients not protected by the Sentinel CPS showed significant cognitive decline post‐procedure when compared to those protected by the Sentinel CPS. Protected patients also showed a robust reduction in the number and volume of new cerebral lesions at five days,” said Dr. van Mieghem.
Also presented at TCT was a post hoc, 3D voxel‐wise analysis of CLEAN‐TAVI DW‐MRI images illustrating that only two percent of the left posterior region of the brain remains fully unprotected when a Claret Medical cerebral protection system is used. The data were presented by Axel Linke, MD, Professor of Medicine, Department of Internal Medicine/Cardiology, University of Leipzig, Germany.
“Post hoc neuroimaging and neurological analysis is providing a more complete, and troubling, picture of the brain post‐TAVR,” said Dr. Linke. “Evidence is building that more sustained damage than we previously realized may be created when we don’t protect the brain from embolic debris. The use of cerebral protection, however, has now been shown to effectively shield the brain from potentially dangerous debris showers caused by the TAVR procedure.”
“Claret Medical is leading the way in incorporating advanced neuroimaging methodologies in its studies in order to obtain an accurate picture of patients’ brain health pre‐ and post‐TAVR,” said Claret Medical Chief Executive Officer Azin Parhizgar, Ph.D. “When we incorporate 3‐Tesla MRI analysis at baseline in clinical studies, CLEAN‐TAVI showed us that nearly 40 percent of patients present with pre‐existing lesions, and 17 percent of those with volume greater than 100mm.2 Utilizing the more sensitive 3T MRI enables us to accurately quantify the number and volume of all new lesions caused by TAVR. This imaging algorithm also tells us that, while a substantial number of new lesions are measured at sub‐3mm,2 the cumulative debris shower that impacts the brain may be quite large.”
The Sentinel CPS received the CE Mark in 2013 and now, more than 2,000 commercial cases have been performed using Claret Medical’s cerebral protection technology. The Sentinel CPS is also currently being studied in the U.S and Europe as part of the SENTINEL pivotal trial, the first FDA‐approved trial of a cerebral protection system and the largest randomized trial in the field to date.
About Claret Medical
Claret Medical™ is a privately‐held company focused on innovative solutions for cerebral protection during structural heart interventions, vascular interventions, and cardiac surgery procedures. The company is currently focusing product development and clinical research on addressing the problem of stroke during TAVR, a significant unmet clinical need. For more information: www.claretmedical.com.
CAUTION: Investigational Device. Limited by United States law to investigational use. Claret Medical and Sentinel are trademarks of Claret Medical, Inc.
1. Linke A. CLEAN‐TAVI: A Prospective, Randomized Trial of Cerebral Embolic Protection in High Risk Patients with Aortic Stenosis Undergoing Transcatheter Aortic Valve Replacement. Transcatheter Cardiovascular Therapeutics (TCT). 2014
2. van Mieghem N et al. Histopathology of Embolic Debris Captured During Transcatheter Aortic Valve Replacement. Circulation. 2013;127:2194‐2201
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