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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The scientific guarantor of this publication is Liming Xia.
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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.
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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.
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• 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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DOI: https://doi.org/10.1007/s00330-020-07211-y