- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01414387
Effects of Cerebral Protection With Filters vs. Flow Reversal on Cerebral Embolization After Carotid Artery Stenting
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Description of Procedures to be performed
Pre-Procedure Medication Regimen The standard of care premedication with antiplatelet therapy for CAS will be used for the study. To minimize the risk of neurological events related to stent thrombosis during the procedure, subjects should be provided antiplatelet therapy for a minimum of 48 to 72 hours prior to the procedure, to include: 1) Aspirin 325 mg daily and 2) Clopidogrel (Plavix®) 75 mg twice daily OR Ticlopidine (Ticlid®) 250 mg twice daily
A protracted dose of premedication may be substituted by administering a loading dose of antiplatelet therapy at least 4 hours prior to the carotid intervention on the day of the procedure, to include: 1) Aspirin A 650 mg loading dose of aspirin, provided that it is not enteric coated or extended release, and 2) Clopidogrel (Plavix ®) 450 mg.
Procedure: Patients will undergo CAS with FDA-approved carotid stents under embolic protection with the Accunet device or the Gore NPS. All CAS procedures will be performed through retrograde access from the common femoral artery. CAS procedures will be performed using a fixed angiographic unit (Allura Xper FD20, Philips, Bothell, WA). Procedural details and CAS protocols will follow techniques described in detail before.14 The procedure will be performed under local anesthesia with minimal sedation to facilitate continuous neurological evaluation. Baseline angiographic studies will be performed concurrently with the CAS procedure. The diagnostic angiography will be reviewed to ensure that the patient does not meet any applicable angiographic exclusion criteria. Once this has been determined, randomization will be performed. The Accunet filter or the Gore NPS will be used according to the instructions for use. Ultrasound-guided access to the ipsilateral or contralateral femoral vein will be obtained if the patient is randomized to CAS with the Gore NPS. Neurological monitoring of the subject's level of awareness will be evaluated every 5 to 10 minutes during the CAS procedure. Patients deemed ineligible by angiographic criteria will be considered screen failures and will be excluded from the study. These patients may receive further treatment outside of the study protocol according to usual practice and standard of care.
Transcranial Doppler Protocol: Transcranial Doppler signals, using a portable digital 2-MHz PMD/spectral TCD unit (PMD150, Spencer Technologies, Seattle, WA), will be recorded from bilateral middle cerebral arteries via transtemporal windows. Monitoring will be started in the operative room immediately before CAS and continued until the end of the case or for at least 15 minutes after removal of the neuroprotection system. A head frame will be used for ultrasound probe fixation and continuous flow assessment in M1 segment of the middle cerebral artery (MCA). Several TCD parameters will be recorded: MES counts and microemboli shower detection during the different steps of the procedure, initial MCA mean velocity, mean MCA velocity during CAS, and final mean MCA velocity. MES will be identified according to the recommended guidelines.31 Data will be stored on a hard disk using a coding system and will be analyzed off-line on a later day by readers who will be blinded to patient information.
Diffusion-weighted MRI exams: All patients will have DW-MRI scans of the brain obtained within 24 hours prior to CAS and 18 to 24 hours after CAS. Postprocedural DW-MRI studies will be compared to preprocedural studies to identify new procedure-related ischemic cerebral lesions.32, 33 DW-MRI will be obtained using standard head coils on 1.5 Tesla Siemens scanners (Siemens Avanto or Magnetom Sonata, Siemens, Erlangen, Germany). DW-MRI with echo-planar imaging sequence (B0 = 1000) and fluid-attenuated inversion recovery (FLAIR) images will be obtained in axial and coronal sections. The DW-MRI studies will then be evaluated by neuroradiologists blinded to the clinical status, the type of embolic protection and TCD data of the patients. On the postprocedural MRI, acute embolic lesions will be defined as focal hyperintense areas with restricted diffusion signal, which will be confirmed by apparent diffusion coefficient mapping to rule out artifacts. New postprocedural cerebral lesions consistent with microemboli will be recorded in terms of location and number for all DW-MRI exams performed.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
Texas
-
Dallas, Texas, United States, 75216
- Dallas VA Medical Center
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Patient is at least 18 years old;
- Patient is willing and capable of complying with the study protocol requirements, including the specified follow-up period;
- Patient is willing to provide written informed consent prior to enrollment in the study;
- Male, infertile female, or non-lactating female of child bearing potential practicing an acceptable method of birth control with a negative pregnancy test within 7-days prior to study procedure;
- Patient is either symptomatic, i.e. with a history of TIAs or non-disabling stroke within 6 months of the procedure, with carotid stenosis ≥ 50%, or asymptomatic with carotid stenosis ≥ 80%, as diagnosed by angiography using NASCET methodology;4
- The target lesion is located in the internal carotid artery (ICA) and the reference vessel diameter, i.e. the common carotid artery (CCA) is < 10 mm based on angiographic assessment.
Exclusion Criteria:
- Acute evolving or recent stroke within 7 days of study evaluation;
- Cardiac embolism;
- Acute myocardial infarction less than 72 hours prior to the procedure;
- Major surgical procedure within 30 days preceding CAS;
- Major surgical procedure within 30 days after the index procedure;
- Prior major ipsilateral stroke with residual deficit or other neurologic conditions that may affect neurological assessments;
- Pregnancy or breastfeeding;
- Severe chronic renal insufficiency (serum creatinine is ≥ 2.5 mg/dL);
- Contraindication to study medications, including antiplatelet therapy;
- Prior sensitivity to contrast media that cannot adequately be controlled with pre-medication;
- Untreatable bleeding diathesis or hypercoagulable state or refusal to blood transfusions;
- History of uncontrolled pulmonary hypertension;
- Intracranial pathology;
- Patient unable or unwilling to undergo DW-MRI of the brain
- Patient without adequate transtemporal window for transcranial Doppler examination
- Other anatomic or co-morbid conditions that, in the investigator's opinion, could limit the patient's ability to participate in the study or to comply with follow-up requirements, or impact the scientific soundness of the study results.
- Isolated ipsilateral hemisphere leading to subject intolerance to flow reversal;
- Anatomic conditions that preclude performance of carotid artery stenting.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: Carotid filter
For this intervention group, patients will receive FDA-approved filter devices for cerebral embolic protection during carotid artery stenting intervention.
|
Patients randomized to this group will receive filter devices to prevent cerebral embolization during carotid stenting, assessed by intraoperative transcranial Doppler and postoperative cerebral DW-MRI. The filter used for this trial is the RX accunet embolic protection system manufactured by abbott. |
Active Comparator: Carotid reversal of flow
For this intervention group, patients will receive reversal of flow with the FDA-approved Gore Neuroprotection System for cerebral protection during carotid artery stenting.
|
On the flow reversal arm two type of devices will be used.
The first is the Gore flow reversal system, manufactured by LW Gore and the second device is the IVANTEC MoMa Ultra Embolic protection device, manufatured by IVANTEC.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Cerebral embolization
Time Frame: Within 24 hours post carotid artery stenting
|
Number of cerebral macro and microembolic events assessed as the number of new ipsilateral brain lesions detected by brain diffusion-weighted magnetic resonance imaging within 24 hours post carotid artery stenting and number of intraoperative microembolic signals detected by transcranial Doppler in the middle cerebral artery ipsilateral to the procedure during carotid artery stenting.
|
Within 24 hours post carotid artery stenting
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Any Stroke, TIA, MI or death
Time Frame: Within 30 days after carotid artery stenting
|
Occurrence of any stroke, transient ischemic attack (TIA), myocardial infarction, or death within 30 days after carotid artery stenting.
|
Within 30 days after carotid artery stenting
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Technical success of carotid artery stenting
Time Frame: 4 weeks.
|
4 weeks.
|
|
Stent thrombosis
Time Frame: within 30 days post procedure
|
Thrombosis of carotid artery stent implanted during the index procedure, assessed within 30 days after procedure
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within 30 days post procedure
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Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Principal Investigator: Carlos H Timaran, MD, Dallas VA Medical Center
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 11GRNT7960035
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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