Impact of Non-obstructive left main disease on the progression of coronary artery disease: A PARADIGM substudy

Jonathan R. Weir-McCall, Philipp Blanke, Stephanie L. Sellers, Amir A. Ahmadi, Daniele Andreini, Matthew J. Budoff, Filippo Cademartiri, Kavitha Chinnaiyan, Jung Hyun Choi, Eun Ju Chun, Edoardo Conte, Ilan Gottlieb, Martin Hadamitzky, Yong Jin Kim, Byoung Kwon Lee, Sang Eun Lee, Erica Maffei, Hugo Marques, Gianluca Pontone, Gilbert L. RaffSanghoon Shin, Ji Min Sung, Peter Stone, Habib Samady, Renu Virmani, Jagat Narula, Daniel S. Berman, Leslee J. Shaw, Jeroen J. Bax, Fay Y. Lin, James K. Min, Hyuk Jae Chang, Jonathon A. Leipsic

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Background: The aim of the study is examine the impact of non-obstructive (<50%stenosis) left main (LM) disease on the natural history of coronary artery disease using serial coronary computed tomography angiography (CTA). Methods: CTAs from the PARADIGM (Progression of atherosclerotic plaque determined by computed tomographic angiography imaging) study, a prospective multinational registry of patients who underwent serial CTA at a ≥2 year interval were analyzed. Those without evidence of CAD on their baseline scan were excluded, as were those with obstructive left main disease. Coronary artery vessels and their branches underwent quantification of: plaque volume and composition; diameter stenosis; presence of high-risk plaque. Results: Of 944 (62 ± 9 years, 60% male) who had evidence of CAD at baseline, 444 (47%) had LM disease. Those with LM disease had a higher baseline plaque volume (194.8 ± 221mm3 versus 72.9 ± 84.3mm3, p < 0.001) and a higher prevalence of high-risk plaque (17.5% versus 13%, p < 0.001) than those without LM disease. On multivariable general linear model, patients with LM disease had greater annual rates of progression of total (26.5 ± 31.4mm3/yr versus 14.9 ± 20.1mm3/yr, p < 0.001) and calcified plaque volume (17 ± 24mm3/yr versus 7 ± 11mm3/yr, p < 0.001), with no difference in fibrous, fibrofatty or necrotic core plaque components. Conclusion: The presence of non-obstructive LM disease is associated with greater rates of plaque progression and a higher prevalence of high-risk plaque throughout the entire coronary artery tree compared to CAD without LM involvement. Our data suggests that non-obstructive LM disease may be a marker for an aggressive phenotype of CAD that may benefit from more intensive treatment strategies.

Original languageEnglish
Pages (from-to)231-237
Number of pages7
JournalJournal of Cardiovascular Computed Tomography
Issue number3
StatePublished - 1 May 2018


  • Coronary computed tomography angiography
  • Left main coronary artery disease
  • Natural history


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