Chronic Transcranial Direct Current Stimulation in Patients With Systemic Autoimmune Myopathies

This study is evaluating the use of transcranial direct current stimulation (tDCS) — a non-invasive brain stimulation technique — in people with systemic autoimmune myopathies (SAM). SAM includes conditions like polymyositis and dermatomyositis, which cause muscle weakness and pain. Researchers are investigating whether tDCS can help reduce pain or improve muscle function when applied repeatedly over time. You may be eligible if: - You have been diagnosed with a systemic autoimmune myopathy according to EULAR/ACR 2017 criteria or Connors et al. classification criteria - You are between 18 and 70 years old You may NOT be eligible if: - You have an active cancer (neoplasia) - You have a heart pacemaker or metallic visceral clips - You have an active infection (HIV, HTLV-1, Hepatitis, etc.) - You are pregnant - You have a history of seizures or epilepsy Talk to your rheumatologist about whether brain stimulation therapy might be appropriate given your current treatment status and overall health.