Systematic Aetiological Assessment of Myocarditis: A Prospective Cohort Study

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Michel, Vincent | Lazaro, Estibaliz | Fauthoux, Thomas | Cetran, Laura | Contin-Bordes, Cécile | Blanco, Patrick | Seguy, Benjamin | Baudinet, Thomas | Coste, Pierre | Gerbaud, Edouard

Edité par CCSD ; MDPI -

International audience. Myocarditis is commonly diagnosed in the intensive care cardiology unit (ICCU). No current recommendation nor guideline aids exist for aetiological assessments. Methods: From September 2021 to October 2023, 84 patients with acute myocarditis underwent thorough and systematic serum and blood cell panel evaluations to determine the most common causes of myocarditis. Results: Of the 84 patients (median age 34 years, range 22–41 years, 79% male), 16 presented with complicated myocarditis. The systematic aetiological assessment revealed that 36% of patients were positive for lupus anticoagulant, 12% for antinuclear antibodies, 8% for anti-heart antibodies, and 12% for anti-striated muscle antibodies. Viral serology did not yield any significant results. After the aetiological assessment, one patient was diagnosed with an autoimmune inflammatory disorder (Still’s disease). T-cell subset analyses indicated that myocarditis severity tended to increase with the T-cell lymphopenia status. Conclusions: A comprehensive, systematic aetiological assessment was of limited value in terms of predicting the clinical or therapeutic outcomes in myocarditis patients presenting to the ICCU.

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