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Non-invasive volumetric assessment of aortic atheroma: a core laboratory validation using computed tomography angiography

  • Muhammad Hammadah
  • Mohammed Qintar
  • Steven E. Nissen
  • Julie St. John
  • Saqer Alkharabsheh
  • Motunrayo Mobolaji-Lawal
  • Femi Philip
  • Kiyoko Uno
  • Yu Kataoka
  • Brett Babb
  • Roman Poliszczuk
  • Samir R. Kapadia
  • E. Murat Tuzcu
  • Paul Schoenhagen
  • Stephen J. Nicholls
  • Rishi PuriEmail author
Original Paper

Abstract

Aortic atherosclerosis has been linked with worse peri- and post-procedural outcomes following a range of aortic procedures. Yet, there are currently no standardized methods for non-invasive volumetric pan-aortic plaque assessment. We propose a novel means of more accurately assessing plaque volume across whole aortic segments using computed tomography angiography (CTA) imaging. Sixty patients who underwent CTA prior to trans-catheter aortic valve implantation were included in this analysis. Specialized software analysis (3mensio Vascular™, Pie Medical, Maastricht, Netherlands) was used to reconstruct images using a centerline approach, thus creating true cross-sectional aortic images, akin to those images produced with intravascular ultrasonography. Following aortic segmentation (from the aortic valve to the renal artery origin), atheroma areas were measured across multiple contiguous evenly spaced (10 mm) cross-sections. Percent atheroma volume (PAV), total atheroma volume (TAV) and calcium score were calculated. In our populations (age 79.9 ± 8.5 years, male 52 %, diabetes 27 %, CAD 84 %, PVD 20 %), mean ± SD number of cross sections measured for each patient was 35.1 ± 3.5 sections. Mean aortic PAV and TAV were 33.2 ± 2.51 % and 83,509 ± 17,078 mm3, respectively. Median (IQR) calcium score was 1.5 (0.7–2.5). Mean (SD) inter-observer coefficient of variation and agreement for plaque area among 4 different analysts was 14.1 (5.4), and the mean (95 % CI) Lin’s concordance correlation coefficient was 0.79 (0.62–0.89), effectively simulating a Core Laboratory scenario. We provide an initial validation of cross-sectional volumetric aortic atheroma assessment using CTA. This proposed methodology highlights the potential for utilizing non-invasive aortic plaque imaging for risk prediction across a range of clinical scenarios.

Keywords

Aortic atheroma Plaque volume CTA CT angiogram 

Abbreviations

CTA

Computed tomography angiography

MDCTA

Multi-detector computed tomography angiography

TAV

Total atheroma volume

PAV

Percent atheroma volume

TAVI

Transcatheter aortic valve implantation

Notes

Conflict of interest

Steven E. Nissen has received research support to perform clinical trials through the Cleveland Clinic Coordinating Center for Clinical Research from Pfizer, AstraZeneca, Novartis, Roche, Daiichi-Sankyo, Takeda, Sanofi-Aventis, Resverlogix, and Eli Lilly; and is a consultant/advisor for many pharmaceutical companies but requires them to donate all honoraria or consulting fees directly to charity so that he receives neither income nor a tax deduction. Stephen J. Nicholls has received speaking honoraria from AstraZeneca, Pfizer, Merck Schering-Plough and Takeda, consulting fees from AstraZeneca, Pfizer, Merck Schering-Plough, Takeda, Roche, NovoNordisk, LipoScience and Anthera and research support from AstraZeneca and Lipid Sciences. All other authors have reported that they have no relationships to disclose.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Muhammad Hammadah
    • 1
  • Mohammed Qintar
    • 1
  • Steven E. Nissen
    • 2
    • 3
  • Julie St. John
    • 2
  • Saqer Alkharabsheh
    • 1
  • Motunrayo Mobolaji-Lawal
    • 4
  • Femi Philip
    • 3
  • Kiyoko Uno
    • 3
  • Yu Kataoka
    • 5
  • Brett Babb
    • 3
  • Roman Poliszczuk
    • 3
  • Samir R. Kapadia
    • 3
  • E. Murat Tuzcu
    • 3
  • Paul Schoenhagen
    • 3
  • Stephen J. Nicholls
    • 5
    • 6
  • Rishi Puri
    • 2
    • 3
    • 6
    Email author
  1. 1.Department of Internal MedicineCleveland Clinic FoundationClevelandUSA
  2. 2.Atherosclerosis Imaging Core Laboratory, Cleveland Clinic Coordinating Center for Clinical Research (C5R)Cleveland ClinicClevelandUSA
  3. 3.Department of Cardiovascular MedicineCleveland ClinicClevelandUSA
  4. 4.Lerner College of MedicineCleveland ClinicClevelandUSA
  5. 5.South Australian Health and Medical Research InstituteAdelaideAustralia
  6. 6.University of AdelaideAdelaideAustralia

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