Patient-Reported Outcomes in Myositis.

Idiopathic inflammatory myopathies (IIM) impact patients' lives in diverse and complex ways beyond their muscle weakness. Patient-reported outcomes (PROs), which directly measure patients' daily experience with IIM without interpretation of care providers, are crucial to assess the real-world impact of IIM. The OMERACT Myositis Working Group has been working on developing a core domain set of PROs with respective measurement instruments for use in clinical trials and routine clinical care. The newly defined core domain set includes fatigue, pain interference, and physical function. Integrating PROs into practice may improve patient-provider communication and support shared decision-making in IIM management.