title: Brain death (first of two parts).
mesh_terms: D001926:Brain Death; D002533:Cerebral Angiography; D003128:Coma / Q000209:etiology; D003937:Diagnosis, Differential; D004562:Electrocardiography; D006801:Humans; D011680:Pupil; D012026:Reflex, Stretch; D013997:Time Factors