Clinical Trial: Plasma Exchange for Autoimmune Autonomic Failure
Study Status: Completed
Recruit Status: Completed
Study Type: Observational
Official Title: Plasma Exchange for Autoimmune Autonomic Failure
Brief Summary:
This study will explore whether an antibody is influencing the autonomic nervous system, and if its removal will eliminate signs and symptoms of failure in that system. The autonomic nervous system is responsible for many automatic changes involved in everyday activities, such as standing up, digesting food, and exercising in the heat. Antibodies fight germs but sometimes cause health problems. Removal of the antibody is done through a procedure called a plasma exchange.
Patients with primary chronic autonomic failure and a circulating antibody to what is called the neuronal nicotinic receptor may be eligible for this study. To be eligible, patients will have participated in an earlier study, protocol number 03-N-0004. Patients will undergo tests and procedures that include an electrocardiogram, and blood collection for hepatitis, HIV, and pregnancy. Blood will be tested for a complete blood count, clotting factors, and chemistries. There will also be tests for liver function, kidney function, cortisol, and thyroid. Participants will be tested for signs and symptoms of autonomic failure, and will be asked to complete questionnaires about various symptoms before the plasma exchange, 1 or 2 weeks afterward, and then monthly or bimonthly for up to 1 year. Patients will undergo a series of other tests. In one test, a patient is upright and blows against a resistance (Valsalva maneuver). The quantitative sudomotor axon reflex test (QSART) uses iontophoresis, involving application of acetylcholine, a chemical messenger, and a small amount of electricity. QSART examines the regulation of sweating, a particular aspect of the autonomic nervous system. There will be a test using edrophonium, given intravenously (IV), to evaluate that drug's effects on the heart, skin, glands, gastrointestinal activity, bladder tone, and salivation. A glucagon test, also by IV, will show patients' a
Detailed Summary:
Background: Until recently, it was thought that primary chronic autonomic failure occurring without central neurodegeneration (pure autonomic failure, PAF) reflected diffuse loss of catecholamine-producing cells (sympathetic noradrenergic nerves and adrenomedullary chromaffin cells) outside the brain. Rarely, however, PAF patients have clinical laboratory findings suggesting decreased post-ganglionic nerve traffic in intact autonomic nerves, rather than denervation. To date, all of four such patients have also had a high titer of a circulating antibody to the nicotinic receptor mediating ganglionic neurotransmission. In one case, studied by another group, plasma exchange reversed signs and symptoms of autonomic failure, consistent with the antibody being pathogenic.
Purpose: In this Protocol, we will carry out plasma exchange in patients we identify as having PAF, intact cardiac noradrenergic innervation, and a circulating antibody to the neuronal nicotinic receptor, to determine whether antibody pathogenicity is a consistent finding in this condition. We will assess the extent of relationship between symptoms, signs, and clinical laboratory indices of autonomic function with the titer of the antibody and obtain abundant plasma for antibody characterization and target protein identification.
Methods: Autonomic function testing will be done before plasma exchange, 1-2 weeks after plasma exchange, and monthly or bi-monthly thereafter for up to one year. Plasma exchange may be repeated once, when symptoms of autonomic failure return as the antibody level builds up, to verify in individual patients whether repetition of plasma exchange produces reproducible amelioration of clinical and laboratory measures of autonomic failure.
Sponsor: National Institute of Neurological Disorders and Stroke (NINDS)
Current Primary Outcome:
Original Primary Outcome:
Current Secondary Outcome:
Original Secondary Outcome:
Information By: National Institutes of Health Clinical Center (CC)
Dates:
Date Received: August 1, 2006
Date Started: July 14, 2006
Date Completion: April 16, 2009
Last Updated: January 24, 2017
Last Verified: April 16, 2009
