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CMR T1 mapping and strain analysis in idiopathic inflammatory myopathy: evaluation in patients with negative late gadolinium enhancement and preserved ejection fraction

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Abstract

Objectives

To investigate whether cardiovascular magnetic resonance (CMR) T1 mapping and strain parameters can detect early histological and functional myocardial changes in idiopathic inflammatory myopathy (IIM) with negative late gadolinium enhancement (LGE) and preserved ejection fraction.

Methods

Thirty consecutive patients with IIM (41.5 ± 15.4 years, 24 females) who did not have LGE or reduced left ventricular ejection fraction (LVEF) and 30 age- and gender-matched healthy controls (40.6 ± 14.2 years, 20 females) were recruited. Patients with IIM were further classified into two subgroups according to high-sensitivity cardiac troponin I (hs-cTnI) values: elevated hs-cTnI subgroup (n = 10) and normal hs-cTnI subgroup (n = 20). Myocardial native T1 values, extracellular volume (ECV) fractions, and strain parameters were analyzed in patients with IIM and healthy controls.

Results

Compared with healthy controls, patients with IIM had significantly prolonged native T1 values and increased ECV in each LV segment (p < 0.05). In further subgroup analysis, LV mid-slice native T1 values had the most power to discriminate between patients with elevated hs-cTnI and healthy controls (area under the curve = 0.92). There was no significant difference of global LV strain or strain rates between IIM patients and controls.

Conclusions

Diffuse interstitial fibrosis can be detected by CMR T1 mapping in patients with IIM who do not have LGE or reduced LVEF or elevated hs-cTnI, and it may be a promising method for screening subclinical cardiac involvement in IIM.

Key Points

• Myocardial abnormality in IIM is often subclinical and leads to poor prognosis.

• Conventional CMR parameters have limitations in early detection of cardiac function and tissue changes.

CMR T1 mapping techniques and myocardial strain analysis have the potential to provide detailed information on cardiac histology and function.

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Abbreviations

BSA:

Body surface area

CK:

Creatine kinase

CK-MB:

Creatine kinase-MB isoenzymes

CMR:

Cardiovascular magnetic resonance

CRP:

C-reactive protein

DM:

Dermatomyositis

EDVI:

End-diastolic volume index

EF:

Ejection fraction

ESVI:

End-systolic volume index

Hct:

Hematocrit

HR:

Heart rate

hs-cTnI:

High-sensitivity cardiac troponin I

IIM:

Idiopathic inflammatory myopathy

LV:

Left ventricle

LVEF:

Left ventricular ejection fraction

NAM:

Necrotizing autoimmune myopathy

NSM:

Nonspecific myositis

NT-proBNP:

N-terminal prohormone of brain natriuretic peptide

PM:

Polymyositis

ROC:

Receiver operating characteristic

SR:

Strain rate

SSFP:

Steady-state free precession

SVI:

Stroke volume index

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Acknowledgments

The authors are grateful to Jing An, a scientist at MR Collaboration NE Asia, Siemens Healthcare.

Funding

This study has received funding by Liming Xia and was supported by a grant from the National Natural Science Foundation of China (No. 81471637 and No. 81873889).

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Correspondence to Liming Xia.

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The scientific guarantor of this publication is Liming Xia.

Conflict of interest

One of the authors of this manuscript (Xiaoyue Zhou) is an employee of Siemens. The remaining authors declare no relationships with any companies whose products or services may be related to the subject matter of the article.

Statistics and biometry

No complex statistical methods were necessary for this paper.

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Written informed consent was not required for this study because of the retrospective design.

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Institutional review board approval was obtained.

Methodology

• retrospective

• case-control study

• performed at one institution

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Zhao, P., Huang, L., Ran, L. et al. CMR T1 mapping and strain analysis in idiopathic inflammatory myopathy: evaluation in patients with negative late gadolinium enhancement and preserved ejection fraction. Eur Radiol 31, 1206–1215 (2021). https://doi.org/10.1007/s00330-020-07211-y

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