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Clopidogrel Resistance and Embolism in Carotid Artery Stenting (CRECAS)

This study is currently recruiting participants. (see Contacts and Locations)
Verified April 2017 by Oh Young Bang, Samsung Medical Center
Yuyu Pharma, Inc.
Information provided by (Responsible Party):
Oh Young Bang, Samsung Medical Center Identifier:
First received: April 28, 2014
Last updated: April 24, 2017
Last verified: April 2017
The purpose of this study is to evaluate the efficacy and safety of the ticlopidine + ginko biloba compared to clopidogrel in clopidogrel resistant patients undergoing carotid artery stent placement. The investigators hypothesized that ticlopidine + ginko biloba is superior than clopidogrel in terms of post-stent ischemic lesions in these patients without serious complications.

Condition Intervention Phase
Carotid Stenosis
Drug: Ticlopidine + Ginko biloba
Drug: Clopidogrel
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: No masking
Primary Purpose: Treatment
Official Title: Ticlopidine+Ginkgo Biloba Versus Clopidogrel in Clopidogrel Resistant Patients Undergoing Cartoid Artery Stent Placement

Resource links provided by NLM:

Further study details as provided by Oh Young Bang, Samsung Medical Center:

Primary Outcome Measures:
  • New ischemic lesion on diffusion-weighted imaging (DWI) [ Time Frame: within 24 hours after carotid stenting ]
    Presence of new ischemic lesion in the ipsilesioinal hemisphere on DWI after carotid stening

Secondary Outcome Measures:
  • Number and Volume of new ischemic lesions on DWI [ Time Frame: within 24 hours after carotid stenting ]
  • Benign and malignant microembolic signals (MES) on transcranial Doppler (TCD) [ Time Frame: within 24 hours after carotid stenting ]
  • Ischemic stroke or transient ischemic attack (TIA) [ Time Frame: within 30 days after carotid stenting ]
  • Change of clopidogrel resistance [ Time Frame: 1 day after carotid stenting ]
    Change of clopidogrel resistance measured by Verify now (P2Y12)

  • Pucture site hematoma [ Time Frame: within 30 days after carotid stenting ]
  • Mycocardial infarction [ Time Frame: within 30 days after carotid stenting ]
  • Death [ Time Frame: within 30 days after carotid stenting ]
  • Hematological abnormalities [ Time Frame: within 30 days after carotid stenting ]
    Neutrophil <1500/uL Platelet <100,000/uL AST or ALT >120 U/L

Estimated Enrollment: 86
Study Start Date: June 2014
Estimated Study Completion Date: December 2017
Estimated Primary Completion Date: December 2017 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Ticlopidine+Ginko biloba
Switch to ticlopidine + ginko biloba
Drug: Ticlopidine + Ginko biloba
ticlopidine hydrochloride 250mg, ginko leaf ext. 80mg, twice daily
Other Name: Yuclid
Active Comparator: Clopidogrel
Keep clopidogrel
Drug: Clopidogrel
clopidogrel bisulfate 97.875mg(75mg as clopidogrel)
Other Name: Plavix


Ages Eligible for Study:   20 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients scheduled for stent implantation due to carotid stenosis
  • Patients resistant to clopidogrel defined by platelet inhibition rate <20% measured by Verify Now before carotid stenting
  • Patients with informed consent

Exclusion Criteria:

  • Antiplatelet therapy other than aspirin, clopidogrel, or ticlopidine
  • Unable to perform MRI scans
  • Patients with hematologic abnormalities including neutrophil <1500/ul, platelet <100,000/uL, or AST/ALT >120 U/L
  • Unsuitable for participation
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT02133989

Contact: Oh Young Bang, MD 82-2-3410-3599
Contact: Suk Jae Kim, MD 82-2-3410-1895

Korea, Republic of
Oh Young Bang Recruiting
Seoul, Korea, Republic of, 135710
Contact: Oh Young Bang, MD    82-2-3410-3599   
Sub-Investigator: Suk Jae Kim, MD         
Principal Investigator: Oh Young Bang, MD         
Sub-Investigator: Mi-Ji Lee, MD         
Sponsors and Collaborators
Samsung Medical Center
Yuyu Pharma, Inc.
Principal Investigator: Oh Young Bang, MD Samsung Medical Center
  More Information

Responsible Party: Oh Young Bang, MD, Samsung Medical Center Identifier: NCT02133989     History of Changes
Other Study ID Numbers: 2013-06-123
Study First Received: April 28, 2014
Last Updated: April 24, 2017

Keywords provided by Oh Young Bang, Samsung Medical Center:
Carotid stenosis
Clopidogrel resistance
Stroke, ischemic

Additional relevant MeSH terms:
Carotid Stenosis
Carotid Artery Diseases
Cerebrovascular Disorders
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Arterial Occlusive Diseases
Vascular Diseases
Cardiovascular Diseases
Platelet Aggregation Inhibitors
Purinergic P2Y Receptor Antagonists
Purinergic P2 Receptor Antagonists
Purinergic Antagonists
Purinergic Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Physiological Effects of Drugs
Fibrinolytic Agents
Fibrin Modulating Agents
Cytochrome P-450 CYP2C19 Inhibitors
Cytochrome P-450 Enzyme Inhibitors
Enzyme Inhibitors processed this record on May 25, 2017