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  • Title: Prognostic value of cardiovascular magnetic resonance in patients with biopsy-proven systemic sarcoidosis.
    Author: Flamée L, Symons R, Degtiarova G, Dresselaers T, Gheysens O, Wuyts W, Van Cleemput J, Bogaert J.
    Journal: Eur Radiol; 2020 Jul; 30(7):3702-3710. PubMed ID: 32166494.
    Abstract:
    OBJECTIVES: As prognosis in sarcoidosis is determined by cardiac involvement, the objective was to study the added value of cardiovascular magnetic resonance (CMR) in risk stratification. METHODS: In 114 patients (48 ± 12 years/52% male) with biopsy-proven sarcoidosis, we studied the value of clinical and CMR-derived parameters to predict future events, using sustained ventricular tachycardia, ventricular fibrillation, aborted cardiac death, implantable cardioverter-defibrillator (ICD) placement with appropriate shocks, hospitalization for heart failure, and death as composite endpoint. Median follow-up after CMR was 3.1 years (1.1-5.7 years). RESULTS: The ejection fraction (EF) was 58.2 ± 9.1% and 54.7 ± 10.8% for left ventricle (LV) and right ventricle (RV), respectively. LV late gadolinium enhancement (LGE) was present in 40 patients (35%) involving 5.1% of the LV mass (IQR, 3.0-12.0%), with concomitant RV involvement in 12 patients (11%). T2-weighting imaging and/or T2 mapping showed active disease in 14 patients. The composite endpoint was reached in 34 patients, with 7 deaths in the LGE-positive group (17.5%), versus two deaths in the LGE-negative group (2.7%) (p = 0.015). At univariate analysis, RVEF (p = 0.009), pulmonary arterial pressure (p = 0.002), and presence of LGE (p < 0.001) and LGE (% of LV) (p < 0.001) were significant. At multivariate analysis, only presence of LGE and LGE (% of LV) was significant (both p = 0.03). At Kaplan-Meier, presence of LGE and an LGE of 3% predicted event-free survival and patient survival. We found no difference in active versus inactive disease with regard to patient survival. CONCLUSION: Myocardial enhancement at LGE-CMR adds independent prognostic value in risk stratification sarcoidosis patients. In contrast, clinical as well as functional cardiac parameters lack discriminative power. KEY POINTS: • Sarcoidosis often affects the heart. • Comprehensive CMR, including T2 imaging and LGE enhancement CMR, allows to depict both active and inactive myocardial damage. • Patient prognosis in sarcoidosis is determined by the presence and severity of myocardial involvement at LGE CMR.
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