Autonomic failure: a neglected presentation of Parkinson's disease

Neurogenic orthostatic hypotension is a fall in blood pressure upon standing due to sympathetic autonomic failure, which can cause orthostatic intolerance and syncope. Pure autonomic failure is a sporadic disorder traditionally defined by the presence of idiopathic neurogenic orthostatic hypotension, usually with signs of neurogenic bladder and bowel dysfunction, but no other neurological features. 1 The Consensus Committee of the American...