This is the first study to indicate that drug-naive patients with new-onset SLE, even those with inactive disease, are likely to have silent cardiac impairment. Structural and functional changes in the myocardium are related to SLE disease stage; this finding indicates the value of early detection of myocardial involvement. Native myocardial T1 values and ECV, rather than currently used clinical rheumatic and cardiac indices, could serve as early detection markers of myocardial injury before the presence of visual fibrosis and functional decompensation.