Prior concussion exposure in patients with isolated REM sleep behavior disorder: a case-control study
This study compared lifetime concussion history in 199 patients with isolated REM sleep behavior disorder (IRBD) versus 168 matched controls, finding concussions more common in IRBD patients (21.1% vs 10.1%). However, concussion history did not significantly predict progression to overt synucleinopathy, suggesting concussion exposure alone is not a strong determinant of IRBD development or disease course.