our findings of the autonomic deficits as manifested by orthostatic hypotension , impaired valsalva 's response , abnormal findings on cold pressor and mental arithmetic tests , and plasma renin and norepinephrine abnormalities in some patients with olivopontocerebellar degeneration suggested a defective central control of the sympathetic nervous system .
C0004388
autonomic
C0039044
sympathetic nervous system