MB and myositis disease: The PC group exhibited a greater incidence of cardiac damage, including a greater proportion of cardiac injury (P = 0.016), clinical diagnosis of myocarditis (P = 0.02), palpitation (P = 0.031), and Myositis Activity Assessment Visual Analog Scale/Myositis Intention-to-Treat Activity Index cardiovascular involvement scores (all P < 0.001), and elevated levels of myoglobin (P = 0.03), creatinine kinase MB (P = 0.015), cardiac troponin T (P = 0.011), N-terminal pro-B-type natriuretic peptide (P = 0.028), lactate dehydrogenase (P = 0.033), and hydroxybutyrate dehydrogenase (P = 0.019).