Cerebral Embolic Protection In Patients Undergoing Surgical Aortic Valve Replacement (SAVR)
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1 Cerebral Embolic Protection In Patients Undergoing Surgical Aortic Valve Replacement (SAVR) Michael Mack, MD, Michael Acker, MD, Steve Messe, MD For the Cardiothoracic Surgical Trials Network (CTSN) American College of Cardiology Late Breaking Clinical Trials March 19, 2017
2 Disclosures Co-PI of Partner 3 Trial Sponsor Edwards Lifesciences Co-PI COAPT Trial- Sponsor Abbott Vascular Executive Board Intrepid Trial- Sponsor Medtronic
3 % of SAVR Patients Background ~50,000 patients undergo SAVR per year in the U.S. The incidence of clinical stroke when examined by a neurologist and postoperative DW MRI in SAVR patients: 100% 80% 60% 61% 40% 20% 0% 17% Radiographic Infarcts Any Clinical Stroke 4% Moderate/Severe Clinical Stroke Messe et al. Stroke after aortic valve surgery: Results from a prospective cohort. Circulation. 2014;129:
4 Purpose Determine the safety and effectiveness of 2 cerebral embolic protection devices in reducing ischemic CNS injury The CardioGard embolic protection cannula The Embol-X intra-aortic filtration device
5 CONSORT Diagram Assessed for Eligibility (n=4225) Excluded (n=3842) Did not meet inclusion criteria (n=3355) Refused to participate (n=460) Other (n=27) Randomized (n=383) Embol-X (n=133) Shared Control (n=132) CardioGard (n=118) Primary Endpoint Analysis Embol-X (n=133) Control (n=132) Primary Endpoint Analysis CardioGard (n=118) Control (n=120)* *12 subjects were randomized to control prior to the start of randomization in the CardioGard arm
6 CTSN Clinical Sites Patients Baylor Research Institute-70 Mission Hospital-56 University of Pennsylvania-50 University of Virginia-34 Emory University-34 Hôpital Laval-27 Montreal Heart Institute-23 Dartmouth-Hitchcock Medical Center-20 University of Southern California-17 Duke University-12 Montefiore Einstein-12 NIH Heart Center at Suburban Hospital-7 Columbia University Medical Center-6 Cleveland Clinic Foundation-4 Toronto General Hospital-4 University of Alberta-3 Ohio State University -2 University of Maryland-2
7 Trial Infrastructure Clinical and Data Coordinating Center Annetine Gelijns, PhD, Alan Moskowitz, MD, Michael Parides, PhD InCHOIR, Mount Sinai Network Chairs Richard Weisel, MD University of Toronto Patrick O Gara, MD Brigham and Women s Hospital Funding NHLBI- Marissa Miller, DVM NINDS- Claudia Moy, PhD CIHR Core Labs Magnetic Resonance Imaging University of Pennsylvania MRI Core Lab Michel Bilello, PhD Neurocognitive Duke Neurocognition Core Lab Jeffrey Browndyke, PhD Histopathology CVPath Institute Renu Virmani, MD
8 Trial Endpoints PRIMARY Freedom from clinical or radiographic CNS infarction at 7 (± 3) days post procedure SECONDARY Composite: 1) clinical ischemic stroke,2) acute kidney injury (AKI), 3) death 30 days after surgery Volume and number of radiographic brain lesions Mortality at 30 days Serious AEs and readmissions within 90 days Delirium 7 days post-operatively Neurocognition at 90 days
9 Trial Design & Analysis ITT comparison of proportion of pts with evidence of CNS injury, with imputation for missing data Assumed control rate of 50% incidence of postoperative CNS infarcts 90% power to show reduction of 17.5% (absolute) 495 patients,165 per group
10 Actual Sample Size At interim analysis, randomization was halted due to low conditional power for achieving primary endpoint 383 patients randomized (77% of intended enrollment) when halted
11 Patient Characteristics Demographics CardioGard (N=118) Control (N=120) Embol-X (N=133) Control (N=132) Age 74.6 ± ± ± ± 6.7 Male 69 (58.5) 77 (64.2) 81 (60.9) 86 (65.2) Medical History Atrial fibrillation 14 (11.9) 16 (13.3) 13 (9.8) 16 (12.1) Diabetes 48 (40.7) 36 (30.0) 36 (27.1) 37 (28.0) MI 16 (13.6) 8 (6.7) 15 (11.3) 10 (7.6) Stroke or TIA 16 (13.6) 8 (6.7) 11 (8.3) 8 (6.1) Cognitive Impairment At least one deficit 37/102 (36.3) 28/109 (25.7) 36/121 (29.8) 31/120 (25.8) Continuous variables are expressed as mean ± SD and categorical variables as count (%).
12 Surgical Characteristics CardioGard (N=118) Control (N=120) Embol-X (N=133) Control (N=132) Surgical Procedure Isolated AVR 67 (56.8) 73 (60.8) 80 (60.2) 80 (60.6) AVR & CABG 51 (43.2) 47 (39.2) 53 (39.8) 52 (39.4) Concomitant procedures 18 (15.3) 19 (15.8) 26 (19.5) 20 (15.2) Duration of CPB min 104.9± ± ± ± 39.8 Continuous variables are expressed as mean ± SD and categorical variables as count (%).
13 Debris Captured Debris captured in 75.8% of CardioGard subjects and 99.1% of Embol-X CardioGard filter 6 mm Embol-X filter
14 Percent of Embol-X Patients with at Least One Particle of a Given Size 0.15 mm 0.5 mm 1 mm 2 mm 16% 61% 88% Percent of Cardiogard Patients with at Least One Particle of a Given Size 99% Valve Tissue Arterial Wall Myocardium Calcium Plaque Thrombus 0.15 mm 68% 0.5 mm 43% 1 mm 14% 2 mm 2% Automated measurement
15 % of Patients w/ No Infarcts Primary Endpoint* Freedom From Clinical or Radiographic CNS infarction OR of CNS Infarct: 1.06 (95% CI: 0.60,1.87) P = 0.84 OR of CNS Infarct: 1.40 (95% CI: 0.81,2.40) P = % 34.8 % 27.1 % 34.8 % CardioGard Control Embol-X Control *OR and P-value based on analysis of imputed data; bar chart based on observed data
16 FLAIR Scan (Linearly aligned to T1)
17 DWI Scan (Linearly aligned to T1)
18 Segmented DWI Lesion
19 ROI (region of interest) Segmentation
20 MRI Lesion Volume: Deciles of Observed Infarct Volume Distribution mm CardioGard: Mean (sd): (386.4) Median (IQR): 42 (0, 151) Control: Mean (sd): (2229.9) Median (IQR): 31 (0, 155) p=0.28 P= % 20% 30% 40% 50% 60% 70% 80% 90% CardioGard Control mm Embol-X: Mean (sd): (778.3) Median (IQR): 74 (0, 322) Control: Mean (sd): (2169.5) Median (IQR): 35 (0, 168) p=0.49 P= Embol-X Control
21 % of Patients Clinical Stroke 9% 8% 7% 6% 5.1% P= % 8.3% P= % P=0.77 Severe (>20) Moderate (5-15) Mild (0-4) 5% 6% P= % 5% 4% 3.4% 3% 2% 1% 0% 7 Days 3 Days
22 % of Patients Delirium at 7 Days 20% P=0.03 P= % 10% Active Control 5% 0% CardioGard vs. Control Embol-X vs Control
23 % of Patients Composite Clinical Endpoint at 30 Days 40.0% 35.0% P=0.08 Clinical ischemic stroke Acute kidney injury Death 30.0% P= % 20.0% 15.0% Active Control 10.0% 5.0% 0.0% CardioGard vs. Control Embol-X vs Control
24 Rate per 100-pt mths Rate per 100-pt mths AEs at 90 Days P=0.55 Bleeding Bleeding P=0.12 Neurological Dysfunction Neurological Dysfunction CardioGard Embol-X P=0.74 P=0.75 P=0.24 P=0.02 Control AKI Cardiac Arrhytmias All Serious AEs Control P=0.35 P<0.01 P=0.22 P=0.08 AKI Cardiac Arrhytmias All Serious AEs
25 % of Patients w/ Decline % of Patients w/ Decline Neurocognitive Decline at 90 Days 60% 50% 40% P=0.14 P=0.65 CardioGard P=0.82 Control 30% 20% 10% 0% Verbal Memory Executive Function Overall Cognition 60% Embol-X Control 50% 40% P=0.40 P=0.05 P= % 20% 10% 0% Verbal Memory Executive Function Overall Cognition
26 Limitations This trial was first experience with these devices in study sites MRI infarcts were diagnosed with both 1.5T and 3T scanners possibly creating heterogeneity Trial was underpowered for clinical stroke and other endpoints especially since stopped early One third of strokes occurred after day 3 and would not be expected to be impacted by protection devices 90 day follow up does not adequately assess long term neurocognitive outcomes
27 Summary In patients undergoing SAVR, the use of 2 different embolic protection devices Was NOT associated with an improvement in Freedom from clinical or radiographic infarction Clinical stroke Overall volume of CNS infarcts by MRI Neurocognitive outcomes at 90 days Was associated with Capture of embolic debris in most patients A reduction in delirium An observed difference in infarct size distribution with fewer large volume infarcts An increase in AE s in the Embol-X patients
28 Conclusions We were unable to demonstrate an increase in freedom from CNS infarction with 2 different devices compared with control Baseline cognitive impairment exists in 1/4-1/3 of neurologically normal patients undergoing SAVR A majority of patients undergoing SAVR have evidence of radiographic infarct by MRI. The association between clinical and radiographic findings in this study and long-term neurocognitive outcomes is the subject of ongoing investigation
29 Implications This is the first large multicenter trial to collect information on brain injury after SAVR The relationship between brain injury and long term neurocognitive outcomes will be further explored
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