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Reproducibility of cardiac magnetic resonance imaging in patients referred for the assessment of cardiac sarcoidosis; implications for clinical practice

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Abstract

Cardiac sarcoidosis (CS) is an increasingly recognized condition, but cardiac magnetic resonance (CMR) image interpretation in these patients may be challenging as findings are often non-specific. The main objective of this study was to investigate the inter-reader agreement for the overall interpretation of CMR for the diagnosis of CS in an experienced reference center and investigate factors that may lead to discrepancies between readers. Consecutive patients undergoing CMR imaging to investigate for CS were included. CMR images were independently reviewed by two readers, blinded to all clinical, imaging and demographic information. The readers classified each scan as “consistent with cardiac sarcoidosis”, “not consistent with cardiac sarcoidosis” or “indeterminate”. Inter-reader agreement was assessed using κ-statistics. When there was disagreement on the overall interpretation, a third reader reviewed the images. Also, two readers independently commented on the presence of edema, presence of LGE (both ventricles) and quantified the extent of left ventricular LGE. 87 patients (43 women, mean age 54.3 ± 12.2 years) were included in the study. There was agreement regarding the overall interpretation in 72 of 87 (83%) CMR scans. The κ value was 0.64, indicating moderate agreement. There was similar moderate agreement in the interpretation of LGE parameters. In an experienced referral center, we found moderate agreement between readers in the interpretation of CMR in patients with suspected CS. Physicians should be aware of this inter-observer variability in interpretation of CMR studies in patients with suspected CS.

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Acknowledgements

We thank Tammy Knight and Karen MacDonald for patient recruitment and study co-ordination. We thank Keri O’Reilly for data entry.

Funding

At the time of data collection and analysis, DJ was a Cardiac Imaging Fellow and was supported by the UOHI Foundation and the Vered-Beanlands Fellowship in Cardiology Research as well as a grant from the CHUM and CHUM Foundation. RSB is a Career Investigator supported by the Heart and Stroke Foundation of Ontario (HSFO), a Tier 1 Chair in Cardiac Imaging Research at the University of Ottawa and Vered Chair in Cardiology at the University of Ottawa Heart Institute. GD was supported by a CIHR new investigator salary support award while at UOHI. D.B. is a Mid-career Investigator supported by the HSFO, UOHI Leadership Chair in Electrophysiology and the Tier 1 University of Ottawa Chair in Electrophysiology Research. This work has also been partially supported by the Canadian Institute of Health Research (D. Birnie, PI) for The Cardiac Sarcoidosis Cohort Study (CHASM-CS). (Grant No. 342139, NCT01477359).

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Correspondence to David Birnie.

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Conflict of interest:

RSB is consultant for- and has received grant funding from GE Healthcare, Lantheus Medical Imaging, and Jubilant DraxImage. DJ is a consultant for AbbVie and Advanced Accelerator Applications. GD provides consultancy support to Artrya Inc. RDK is consultant for- and received grant funding from Jubilant DraxImage, receives royalties from Rubidium-82 generator technologies licensed to Jubilant DraxImage, and from sales of FlowQuant software. All other authors have no relevant conflict of interest or disclosure.

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Juneau, D., Nery, P.B., Pena, E. et al. Reproducibility of cardiac magnetic resonance imaging in patients referred for the assessment of cardiac sarcoidosis; implications for clinical practice. Int J Cardiovasc Imaging 36, 2199–2207 (2020). https://doi.org/10.1007/s10554-020-01923-4

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  • DOI: https://doi.org/10.1007/s10554-020-01923-4

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