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Coronary microcirculation changes in non-ischemic dilated cardiomyopathy identified by novel perfusion CT

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Abstract

Intramyocardial microvessels demonstrate functional changes in cardiomyopathies. However, clinical computed tomography (CT) does not have adequate spatial resolution to assess the microvessels. Our hypothesis is that these functional changes manifest as altered heterogeneity of the spatial distribution of arteriolar perfusion territories. Our goal was to determine whether the spatial analysis of perfusion CT could clinically detect changes in the function and structure of the intramyocardial microcirculation in a non-ischemic dilated cardiomyopathy (DCM). Two groups were studied: (1) a Control group (12 male plus 12 female) with no risk factors nor evidence of coronary artery disease, and (2) a DCM group (12 male plus 12 female) with left ventricular ejection fraction ≤40 % and no evidence of coronary artery disease. Using the CT scan, the LV free wall thickness and its radius of curvature were measured. The DCM group was sub divided into those with LV free wall thickness <11.5 mm and those with thickness ≥11.5 mm. In the myocardial opacification phase of the CT scan sequence, myocardial perfusion (F) and intramyocardial blood volume (Bv) for multiple intramyocardial regions were computed. No significant differences between the groups were demonstrable in overall myocardial F or Bv. However, the myocardial regional data showed significantly increased spatial heterogeneity in the DCM group when compared to the Control group. The findings demonstrate that altered function of the subresolution intramyocardial microcirculation can be quantified with myocardial perfusion CT and that significant changes in these parameters occur in the DCM subjects with LV wall thickness greater than 11.5 mm.

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Acknowledgments

The authors would like to thank the following personnel. Dr. Jodie Christner and Ms. Maria Shiung; Study Coordinator, Jennifer Alkhamis; CT Techs—Lisa L. Jorgenson, Emily Sheedy, Katherine Steele, Cynthia Walfoort, Nikkole Weber; CT Nurses—Laurie Claeys, Susan Persons, Susan Inman Radenz and William Stromme; and the Division of Engineering, Aaron Treat, Ms. Renae M. Forsman, Bruce W. Gustine, and Ms. Diane R. Eaker and Delories C. Darling. This study was funded in part by NIH Grants HL72255 and UL1TR000135.

Conflict of interest

The authors do not have any conflict of interest. All co-authors are employed by the Mayo Clinic. The authors have control of the primary data and allow the journal to review their de-identified data if requested.

Ethical standards

The human studies were approved by the Institutional Review Board and have therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. All persons gave their informed consent prior to their inclusion in the study.

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Correspondence to Erik L. Ritman.

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Miller, W.L., Behrenbeck, T.R., McCollough, C.H. et al. Coronary microcirculation changes in non-ischemic dilated cardiomyopathy identified by novel perfusion CT. Int J Cardiovasc Imaging 31, 881–888 (2015). https://doi.org/10.1007/s10554-015-0619-9

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  • DOI: https://doi.org/10.1007/s10554-015-0619-9

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