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Carotid Plaque Characteristics by MRI in AIM-HIGH (Carotid MRI Substudy)

7. februar 2018 opdateret af: Xue-Qiao Zhao, University of Washington

Carotid Plaque Characteristics by MRI in AIM-HIGH

Heart attacks and strokes caused by the unstable atherosclerotic plaques remain the leading cause of death in the United States. Unstable plaques often have more fat than stable plaques. This study will investigate if a treatment with LDL-lowering plus HDL-raising compared with LDL-lowering alone would more effectively reduce the plaque fat content assessed by magnetic resonance imaging (MRI), therefore, further reducing heart attacks and strokes.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Although studies have suggested that plaque morphology and composition are important determinants of plaque stability, our understanding on plaque tissue components is mainly from histological studies until recent development in MRI technique. A low level of HDL is associated with higher risk of cardiovascular events and increased amount of lipid content in the carotid plaques. Treatment with LDL-lowering plus HDL-raising compared with LDL-lowering alone more effectively protects against atherosclerosis progression. It is widely believed that HDL or its apolipoproteins mediate the removal of excess free cholesterol from peripheral cells and the cholesterol is delivered via either LDL or HDL to the liver for excretion into the bile. However, it has not been tested and approved in human atherosclerotic condition in vivo. The NIH/Abbott-funded multi-center AIM-HIGH trial is designed to compare the clinical efficacy of LDL-lowering alone with statin versus LDL-lowering plus HDL-raising with statin plus nicotinic acid combination therapy in patients with established vascular disease and high triglycerides and low HDL.

We propose to conduct a carotid MRI sub-study in 220 subjects enrolled in AIM-HIGH to investigate the important vascular biological mechanisms of HDL-raising therapy. Image collection will occur at 3 timepoints. The hypotheses and specific aims are:

  • (1) To test the primary hypothesis that compared with LDL-lowering alone, intensive LDL-lowering plus HDL-raising therapy decreases the mean plaque lipid composition in carotid arteries assessed by MRI.
  • (2) To test the hypothesis that compared with LDL-lowering alone, intensive LDL-lowering plus HDL-raising therapy decreases the plaque burden including volume and wall thickness.
  • (3) To test the hypothesis that increased plaque lipid composition or vessel wall thickness by MRI is associated with increased risk of cardiovascular events.
  • (4)To test a hypothesis that LDL-lowering plus HDL-raising, compared to LDL-lowering alone, will promote more rapid plaque lipid depletion. And determine the time-course of atherosclerotic plaque lipid depletion during lipid therapy.
  • (5) To examine the association of clinical risk factors, lipids, lipoprotein heterogeneity, inflammatory markers and carotid plaque characteristics.

This MRI sub-study offers a unique opportunity to investigate the effectiveness of LDL-lowering plus HDL-raising therapy on human atherosclerotic plaque in vivo, to examine the association of plaque characteristics both lipid composition and volume assessed by MRI and cardiovascular outcome, and to gain novel insights in our understanding of atherosclerotic plaque pathology and the mechanisms of intensive lipid management in preventing cardiovascular events.

Undersøgelsestype

Observationel

Tilmelding (Faktiske)

230

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

    • Alberta
      • Calgary, Alberta, Canada, T2E-7C5
        • Heart Health Institute
      • Calgary, Alberta, Canada, T2N-2T9
        • University Of Calgary
    • British Columbia
      • Vancouver, British Columbia, Canada, V5Z-1M9
        • Vancouver General Hospital
    • Ontario
      • London, Ontario, Canada, N6A-5A5
        • University of Western Ontario
    • Arizona
      • Phoenix, Arizona, Forenede Stater, 85032
        • Cardiovascular Consultants
    • California
      • Long Beach, California, Forenede Stater, 90822
        • Long Beach VA Medical Center
      • Los Angeles, California, Forenede Stater, 90033
        • University of Southern California
    • Maryland
      • Baltimore, Maryland, Forenede Stater, 21201
        • University of Maryland
      • Baltimore, Maryland, Forenede Stater, 21205
        • Johns Hopkins University
    • Minnesota
      • Rochester, Minnesota, Forenede Stater, 55905
        • Mayo Clinic
    • North Carolina
      • Durham, North Carolina, Forenede Stater, 27710
        • Duke University
      • Winston-Salem, North Carolina, Forenede Stater, 27157
        • Wake Forest University
    • Pennsylvania
      • Philadelphia, Pennsylvania, Forenede Stater, 19104
        • Philadelphia VA Medical Center
    • Texas
      • Houston, Texas, Forenede Stater, 77030
        • Baylor College of Medicine
      • Houston, Texas, Forenede Stater, 77030
        • Methodist Hospital
      • Houston, Texas, Forenede Stater, 77030
        • Kelsey Research Foundation
    • Washington
      • Seattle, Washington, Forenede Stater, 98104
        • Harborview Medical Center
      • Seattle, Washington, Forenede Stater, 98105
        • University of Washington
      • Seattle, Washington, Forenede Stater, 98108
        • Puget Sound VA Medical Center, Seattle Campus

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

45 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Sandsynlighedsprøve

Studiebefolkning

Participants in the main AIM-HIGH study (NCT00120289)

Beskrivelse

Inclusion Criteria:

  • Eligible for main AIM-HIGH study (NCT00120289)
  • Medically able to undergo MRI procedure
  • Willing to provide informed consent for participation in this substudy

Exclusion Criteria:

  • Uses pacemaker or has metallic implants
  • History of bilateral carotid endarterectomy
  • Glomerular filtration rate less than 60 mL/min/1.73 m^2

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Observationsmodeller: Kohorte
  • Tidsperspektiver: Fremadrettet

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
Simvastatin
Deltagere i hovedundersøgelsen AIM-HIGH, som får simvastatin.
Participants will be enrolled in this substudy only if they are candidates for the main AIM-HIGH study (NCT00120289). Participants will be randomly assigned to simvastatin or simvastatin plus niacin as a part of the main AIM-HIGH protocol, and adjustments in simvastatin and/or niacin doses will be made as per the protocol for the main AIM-HIGH study.
Andre navne:
  • Zocor
  • Niaspan
  • simvastatin
  • niacin
Simvastatin og niacin med forlænget frigivelse
Deltagere i hovedundersøgelsen AIM-HIGH, som får simvastatin og niacin med forlænget frigivelse.
Participants will be enrolled in this substudy only if they are candidates for the main AIM-HIGH study (NCT00120289). Participants will be randomly assigned to simvastatin or simvastatin plus niacin as a part of the main AIM-HIGH protocol, and adjustments in simvastatin and/or niacin doses will be made as per the protocol for the main AIM-HIGH study.
Andre navne:
  • Zocor
  • Niaspan
  • simvastatin
  • niacin

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Mean plaque lipid composition in carotid arteries assessed by MR
Tidsramme: Through 24Months post AIM-HIGH Randomization
To test the primary hypothesis that compared with LDL-lowering alone, intensive LDL-lowering plus HDL-raising therapy decreases the mean plaque lipid composition in carotid arteries assessed by MRI.
Through 24Months post AIM-HIGH Randomization

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Additional plaque characteristics as assessed by MRI
Tidsramme: Through 24Months post AIM-HIGH Randomization
To test the additional hypotheses regarding plaque burden, plaque lipid depletion time course, association with cardiovascular event risk and lipid characteristics.
Through 24Months post AIM-HIGH Randomization

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Samarbejdspartnere

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart

1. marts 2008

Primær færdiggørelse (Faktiske)

1. april 2013

Studieafslutning (Faktiske)

1. februar 2015

Datoer for studieregistrering

Først indsendt

5. august 2010

Først indsendt, der opfyldte QC-kriterier

6. august 2010

Først opslået (Skøn)

10. august 2010

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

9. februar 2018

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

7. februar 2018

Sidst verificeret

1. februar 2018

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 627
  • R01HL088214 (U.S. NIH-bevilling/kontrakt)

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .