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Novel Cardiac Imaging Risk Score for Mortality Prediction in Duchenne Muscular Dystrophy

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Abstract

Cardiovascular disease is the leading cause of death in patients with Duchenne Muscular Dystrophy (DMD), but there is significant cardiomyopathy phenotypic variability. Some patients demonstrate rapidly progressive disease and die at a young age while others survive into the fourth decade. Criteria to identify DMD subjects at greatest risk for early mortality could allow for increased monitoring and more intensive therapy. A risk score was created describing the onset and progression of left ventricular dysfunction and late gadolinium enhancement in subjects with DMD. DMD subjects prospectively enrolled in ongoing observational studies (which included cardiac magnetic resonance [CMR]) were used to validate the risk score. A total of 69 subjects had calculable scores. During the study period, 12 (17%) died from complications of DMD. The median risk score was 3 (IQR [2,5]; range [0,9]). The overall risk score applied at the most recent imaging age was associated with mortality at a median age of 17 years (IQR [16,20]) (HR 2.028, p < 0.001). There were no deaths in subjects with a score of less than two. Scores were stable over time. An imaging-based risk score allows risk stratification of subjects with DMD. This can be quickly calculated during a clinic visit to identify subjects at greatest risk of early death.

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Data Availability

The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

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Funding

Research reported in this publication was supported by the National Heart, Lung, and Blood Institute of the National Institutes of Health under Award Number K23HL123938 and R56HL141248 (Bethesda, MD) (Soslow). The project was supported by the National Center for Research Resources, Grant UL1 RR024975-01, and is now at the National Center for Advancing Translational Sciences, Grant 2 UL1 TR000445-06 (Bethesda, MD). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. This project was supported by the Food and Drug Administration Orphan Products Grant R01FD006649 (Soslow). This project was supported by the Fighting Duchenne Foundation and the Fight DMD/Jonah & Emory Discovery Grant (Nashville, TN) (Soslow) and the Ackerman/Nicholoff Family (Indianapolis, IN) (Markham). The sponsors and funders had no role in the design and conduct of the study or in the collection, analysis, and interpretation of the data, or in the preparation, review, or approval of the manuscript. There are no relationships with industry or other entities to declare.

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Contributions

JRS collected needed retrospective data, performed the data analysis, interpreted the data, and wrote the first draft of the manuscript. KC and KGD conducted primary data collection and provided substantial revisions of the manuscript. JG, DAP, LWM, and JHS conceived of the study, contributed to the design of the scoring system, and provided substantial revisions to the manuscript. All authors read and approved the final manuscript.

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Correspondence to Joseph R. Starnes.

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The authors have no competing interests to declare that are relevant to the content of this article.

Ethical Approval

This study was approved by the Institutional Review Board at Vanderbilt University Medical Center. This study was performed in line with the principles of the Declaration of Helsinki.

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Informed consent was obtained from all individual participants or their legal guardians for all individuals included in the study.

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Starnes, J.R., Crum, K., George-Durrett, K. et al. Novel Cardiac Imaging Risk Score for Mortality Prediction in Duchenne Muscular Dystrophy. Pediatr Cardiol (2022). https://doi.org/10.1007/s00246-022-03040-6

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