Abstract
Myocarditis is an inflammatory disease of the myocardium, which may occur in isolation or as part of systemic infectious/immune/autoimmune conditions, characterized by vast aetiologic, clinical and histopathologic heterogeneity. The broad spectrum of myocarditis can be categorized according to the prevalent histopathologic pattern including lymphocytic, lympho-histiocytic, eosinophilic and neutrophilic forms, giant cell myocarditis and myocarditis with granulomata. Diverse histopathologic substrates generally reflect different aetiologies and pathogenetic mechanisms and may be critical to clinical decision-making. Active vasculitis, when present, completes the inflammatory spectrum. Unfortunately, the correlation of histopathologic patterns, clinical presentation and disease course in myocarditis is still largely unresolved, due to limited availability of bioptic samples at specific stages of disease and impracticality of serial sampling. We here review the elements supporting an aetiology-driven diagnostic work-up in myocarditis, emphasizing the importance of integrating pathologic studies with clinical features and information derived from multimodality imaging. Furthermore, we explore myocardial inflammation in genetic cardiomyopathies, its role in driving clinical variability and the potential of transcriptomic and proteomic analysis in our understanding of these complex interrelations.
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Abbreviations
- cMRI:
-
Cardiac magnetic resonance imaging
- ICD:
-
Implantable cardioverter defibrillator
- EMB:
-
Endomyocardial biopsy
- EGPA:
-
Eosinophilic granulomatosis with polyangiitis
- ESC:
-
European Society of Cardiology
- GCM:
-
Giant cell myocarditis
- HSM:
-
Hypersensitivity myocarditis
- HES:
-
Idiopathic hypereosinophilic syndrome
- IHC:
-
Immunohistochemistry
- LM:
-
Lymphocytic myocarditis
- PCR:
-
Polymerase chain reaction
- SCD:
-
Sudden cardiac death
- SLE:
-
Systemic lupus erythematosus
- TM:
-
Toxic myocarditis
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Acknowledgments
Iacopo Olivotto was supported by the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement no. 777204: ‘SILICOFCM - In Silico trials for drug tracing the effects of sarcomeric protein mutations leading to familial cardiomyopathy’; by the Italian Ministry of Health (Left ventricular hypertrophy in aortic valve disease and hypertrophic cardiomyopathy: genetic basis, biophysical correlates and viral therapy models (RF-2013-02356787), and NET-2011-02347173 (Mechanisms and treatment of coronary microvascular dysfunction in patients with genetic or secondary left ventricular hypertrophy).
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All individuals listed as co-authors of the manuscript (Ornella Leone, Maurizio Pieroni, Claudio Rapezzi and Iacopo Olivotto) gave substantial contributions to the conception or design of the work and to drafting the work or revising it critically for important intellectual content. All co-authors (Ornella Leone, Maurizio Pieroni, Claudio Rapezzi and Iacopo Olivotto) gave final approval of the version to be published and agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work be appropriately investigated and resolved.
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Leone, O., Pieroni, M., Rapezzi, C. et al. The spectrum of myocarditis: from pathology to the clinics. Virchows Arch 475, 279–301 (2019). https://doi.org/10.1007/s00428-019-02615-8
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DOI: https://doi.org/10.1007/s00428-019-02615-8