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Prognostic value of age adjusted segment involvement score as measured by coronary computed tomography: a potential marker of vascular age

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Abstract

Extent of coronary atherosclerotic disease (CAD) burden on coronary computed tomography angiography (CCTA) as measured by segment involvement score (SIS) has a prognostic value. We sought to investigate the incremental prognostic value of ‘age adjusted SIS’ (aSIS), which may be a marker of premature atherosclerosis and vascular age. Consecutive patients were prospectively enrolled into the CONFIRM (Coronary CT Angiography EvaluatioN For Clinical Outcomes: An InteRnational Multicentre) multinational observational study. Patients were followed for the outcome of all-cause death. aSIS was calculated on CCTA for each patient, and its incremental prognostic value was evaluated. A total of 22,211 patients [mean age 58.5 ± 12.7 years, 55.8% male) with a median follow-up of 27.3 months (IQR 17.8, 35.4)] were identified. After adjustment for clinical factors and presence of obstructive CAD, higher aSIS was associated with increased death on multivariable analysis, with hazard ratio (HR) 2.40 (1.83–3.16, p < 0.001), C-statistic 0.723 (0.700–0.756), net reclassification improvement (NRI) 0.36 (0.26–0.47, p < 0.001), and relative integrated discrimination improvement (IDI) 0.33 (p = 0.009). aSIS had HR 3.48 (2.33–5.18, p < 0.001) for mortality in those without obstructive CAD, compared to HR 1.79 (1.25–2.58, p = 0.02) in those with obstructive CAD. In conclusion, aSIS has an incremental prognostic value to traditional risk factors and obstructive CAD, and may enhance CCTA risk stratification.

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Acknowledgements

The assistance of the Mayo Clinic Medical illustrations Unit with the figures is acknowledged with much thanks. Benjamin Chow receives research support from CV Diagnostix, and research and educational support from TeraRecon Inc. and holds the Saul & Edna Goldfarb Research Chair in Cardiac Imaging. There is no funding associated with this work.

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Correspondence to Benjamin J. W. Chow.

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There is no funding associated with this work. Dr. Min received the modest speakers’ bureau and medical advisory board compensation and significant research support from GE Healthcare. Dr. Achenbach received grant support from Siemens and Bayer Schering Pharma and has served as a consultant for Servier. Dr. Al-Mallah received support from the American Heart Association, BCBS Foundation of Michigan, and Astellas. Dr. Cademartiri received grant support from GE Healthcare and has served on the Speakers’ Bureau of Bracco and as a consultant for Servier; Dr. Maffei received grant support from GE Healthcare. Dr. Chinnaiyan received grant support from Bayer Pharma and Blue Cross Blue Shield Blue Care MI. Dr. Chow received research and fellowship support from GE Healthcare, research support from Pfizer and AstraZeneca, and educational support from TeraRecon. Dr. Hausleiter received a research grant from Siemens Medical Systems. Dr. Kaufmann received institutional research support from GE Healthcare and grant support from Swiss National Science Foundation. Dr. Maffei received grant support from GE Healthcare Dr. Raff received grant support from Siemens, Blue Cross Blue Shield Blue Care MI, and Bayer Pharma. Dr. Leipsic has received research support and serves on the speaker’s bureau for GE Healthcare. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from individual participants included in the study or was waived by the institutional research board.

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Ayoub, C., Kritharides, L., Yam, Y. et al. Prognostic value of age adjusted segment involvement score as measured by coronary computed tomography: a potential marker of vascular age. Heart Vessels 33, 1288–1300 (2018). https://doi.org/10.1007/s00380-018-1188-3

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