High Relaxivity Contrast Agent for Cardiac MR in the Myocardial Scar Assessment

Elucirem (Gadopiclenol) is a new macrocyclic gadolinium-based contrast agent (GBCA) with high relaxivity indicated for use in adults and children aged 2 years and older for contrast-enhanced magnetic resonance imaging. The product was approved in 2022 by FDA to be used to detect and visualize lesions with abnormal vascularity in the central nervous system (brain, spine and associated tissues) and the body (head and neck, thorax, abdomen, pelvis, and musculoskeletal system). However, given its at least twofold higher relaxivity than other GBCAs, the performance of Elucirem in cardiac MR (CMR) has yet to be demonstrated. The hypothesis for the study: Half dose (0.05mmol/kg) Elucirem is not inferior to double dose (0.2 mmol/kg) Dotarem in the myocardial scar assessment. All participants will be selected from the investigators previous CMR study cohort with double-dose Dotarem T1 mapping and LGE images. Ten participants without scars will be recruited for the Phase I dose evaluation. Five for 0.05 mmol/kg and five for 0.075 mmol/kg. The investigators have identified 15 participants with LGE findings from double-dose Dotarem CMR acquired in the years 2021, 2022, or earlier years. This study was performed in August 2022. The same protocol will be used for single-dose Elucirem.