What Is Pure Autonomic Failure?

The autonomic nervous system (ANS) runs the body’s automatic functions — the ones you never have to think about: blood pressure, heart rate, breathing regulation, digestion, bladder control, sweating, and the adjustment of blood flow when you move from lying down to standing. In a healthy person, this system operates continuously in the background, making hundreds of fine adjustments every hour.

In Pure Autonomic Failure (PAF), this system breaks down. The nerve cells responsible for autonomic signaling degenerate, and the body loses the ability to regulate these functions automatically. PAF is caused by the abnormal accumulation of a protein called alpha-synuclein in autonomic nerve cells — the same protein implicated in Parkinson’s disease and a related condition called Multiple System Atrophy (MSA). Unlike those diseases, PAF affects the autonomic nervous system almost exclusively, sparing the parts of the brain that control movement and cognition.

PAF is rare — precise prevalence is unknown, but it is significantly less common than Parkinson’s disease. It typically appears in middle to older age and affects men and women roughly equally. The cause is not fully understood, and there is currently no treatment that slows or reverses the underlying degeneration. Management focuses entirely on controlling symptoms.

PAF and MSA: an important distinction

Patients and families are often told, or read online, that PAF can “convert” to MSA — a more serious and rapidly progressive disease. While this does occur in a subset of patients, current research suggests it is less common than once believed. PAF tends to follow a slow course over many years. If you develop new neurological symptoms — changes in movement, balance, speech, or cognition — report them to your physician. These may warrant re-evaluation of your diagnosis.

What PAF affects

• Blood pressure regulation: the most prominent problem; blood pressure falls when standing (orthostatic hypotension) and often rises dangerously when lying down (supine hypertension)
• Heart rate: the normal increase in heart rate that compensates for a BP drop is absent or blunted in PAF
• Temperature regulation: sweating is reduced or absent (anhidrosis), impairing the body’s ability to cool itself; heat intolerance can be severe
• Bladder and bowel: urinary urgency, incomplete emptying, constipation, and less commonly fecal incontinence
• Sexual function: erectile dysfunction in men; reduced sensation in women
• Pupillary response: slower adjustment to changes in light

Prognosis

PAF is a chronic, slowly progressive condition. Most patients live with it for many years and, with good symptom management, maintain meaningful quality of life. The disease does not directly cause death, but its complications — falls, injuries from fainting, cardiovascular stress from BP swings — require active management. A small percentage of PAF patients do eventually develop features of MSA or Parkinson’s disease; regular follow-up with a neurologist or autonomic specialist is important.

Where to get help

• Dysautonomia International: dysautonomiainternational.org — patient advocacy, physician directory, research updates
• Facebook: there is a PAF group with a collective wealth of information. This group also serves as a portal to biweekly Zoom meetings with Dr. Goldstein usually present.
• Autonomic specialty centers: academic medical centers with dedicated autonomic programs (Stanford, Mayo Clinic, Vanderbilt, NYU, and others) offer the most experienced evaluation and management
• Your care team: a neurologist with autonomic expertise should lead your care; your primary care physician plays a key role in day-to-day management and coordination
• See references for additional resources

Medications commonly used in PAF

Medications for PAF almost always require adjustment, or “titrating to effect,” when starting a new one. The central issue is what effect a medication has on BP and how you feel through the day. PAF management requires balancing low standing BP against high lying-down BP. Medication changes should always involve your physician.

Medication	Purpose / Key notes
Droxidopa (Northera)	Raises standing BP; first-line for OH in PAF
Midodrine	Vasopressor; waking hours only — do not take within 4 hrs of lying down
Fludrocortisone	Helps body retain sodium and fluid; raises blood volume
Pyridostigmine	Mild BP support with less effect on supine hypertension
Melatonin / clonidine	Sometimes used at night to reduce supine hypertension — discuss with physician

BP monitoring at home

• BP cuff: upper arm, validated device
• Positions: measure after 5 min supine, after 1–2 min sitting, immediately on standing, and again at 3 min standing
• Log everything: time of day, position, symptoms, meals, activity — patterns are what matter
• Pre/post meal: check BP before and 30–45 min after eating to identify postprandial drops

This guide is for general educational purposes only and is not a substitute for professional medical advice. Always consult your physician regarding your specific condition, medications, or treatment. Medical information changes frequently; verify drug names, dosages, and current guidance independently. The authors disclaim liability for any injury or damage arising from use of this information.