Shy—Drager综合征(原发性直立性低血压)是一种神经系统原发性、多系统变性疾病,以直立性低血压及神经系统多发病征为其临床特点。多见于40～60岁男性,男女之比约3～4:1 病因与病理本症病因不明。一般认为 Shy-Drager syndrome (primary orthostatic hypotension) is a primary and multisystem degenerative disease of the nervous system characterized by orthostatic hypotension and multiple neurological symptoms. More common in 40 to 60-year-old male, male to female ratio of about 3 ~ 4: 1 Etiology and pathology of this disease is unknown. Generally considered