Pure autonomic failure
|Pure autonomic failure|
|Classification and external resources|
Pure autonomic failure (PAF), also known as Bradbury-Eggleston syndrome or idiopathic orthostatic hypotension, is a form of dysautonomia that first occurs in middle age or later in life; men are affected more often than women.
Signs and symptoms
A degenerative disease of the autonomic nervous system, symptoms include dizziness and fainting (caused by orthostatic hypotension), visual disturbances and neck pain. Chest pain, fatigue and sexual dysfunction are less common symptoms that may also occur. Symptoms are worse when standing; sometimes one may relieve symptoms by lying down.
The pathology of pure autonomic failure is not yet completely understood. However, a loss of cells in the intermediolateral column of the spinal cord has been documented, as has a loss of catecholamine uptake and catecholamine fluorescence in sympathetic postganglionic neurons. In general, levels of catecholamines in these patients are very low while lying down, and do not increase much upon standing.
Pharmacological methods of treatment include fludrocortisone, midodrine, somatostatin, erythropoietin, and other vasopressor agents. However, often a patient with pure autonomic failure can mitigate his or her symptoms with far less costly means. Compressing the legs and lower body, through crossing the legs, squatting, or the use of compression stockings can help. Also, ingesting more water than usual can increase blood pressure and relieve some symptoms.
In 1925, Bradbury and Eggleston first characterized three patients seemingly with a common syndrome, with what they described as "the occurrence of syncopal attacks after or during exertion or even after standing erect for some minutes. Other features in the three patients are a slow, unchanging pulse rate, incapacity to perspire, a lowered basal metabolism and signs of slight and indefinite changes in the nervous system. Each of these patients felt much worse during the heat of summer." Further research identified multiple causes for these syndromic findings, now grouped as primary autonomic disorders (also called primary dysautonomia), including Pure Autonomic Failure, Multiple System Atrophy, and Parkinson's. The primary differentiating characteristic of Pure autonomic failure is decreased circulation and synthesis of norepinephrine, and dysfunction localized peripherally. It is relevant to note that progression to central nervous system neurodegeneration can also occur.
- S. Bradbury, C. Eggleston. Postural hypotension: A report of three cases. American Heart Journal, St. Louis, 1925, 1: 73-86.
- Garland, Emily M.; Hooper, William B.; Robertson, David (2013-01-01). Swaab, Ruud M. Buijs and Dick F., ed. Chapter 20 - Pure autonomic failure. Autonomic Nervous System. 117. Elsevier. pp. 243–257. doi:10.1016/b978-0-444-53491-0.00020-1.
- synd/2102 at Who Named It?