View clinical trials related to Primary Dysautonomias.
Filter by:It is known that 33-50% of Classic and Hypermobile Ehlers-Danlos Syndrome patients eventually develop dysautonomia, otherwise known as "POTS" (Postural Orthostatic Tachycardia Syndrome). Some of these patients develop dysautonomia as a result of a retroflexed odontoid, Chiari 1 Malformation or cranial settling and the resulting basilar impression. Many Ehlers-Danlos patients suffer with the same symptomology with no evidence of a cause according to MRI imaging. It is the author's hypothesis that low-level External Communicating Hydrocephalus appears to be responsible for the constellation of autonomic and cranial nerve symptoms, and if present in the very young, an analysis of head circumference growth in the first 15 months of life should reflect abnormally rapid head growth, supporting this hypothesis.
This is a double blind observational analysis of changes in heart rate variability using PD2i analyser in competitive athletes during strenuous exercise and competition.
This is a pilot clinical trial of carbidopa to treat disabling attacks of nausea and vomiting in patients with familial dysautonomia (FD, also known as Riley Day syndrome or hereditary sensory and autonomic neuropathy type III). FD is a rare autosomal recessive disease in which the growth and development of selective nerves is impaired. Patients with FD suffer recurrent uncontrollable nausea and vomiting crises accompanied by skin flushing, tachycardia and arterial hypertension. Current treatments of nausea are ineffective or have intolerable side sides. Our long-term goal is to treat nausea effectively and without side effects, a therapeutic intervention that would markedly improve the quality of life of patients with FD. The investigators have recently found that resting plasma dopamine levels are high in patients with FD and increase up to 40-fold during nausea and vomiting attacks. This led us to postulate that stimulation of dopamine receptors in the chemoreceptor trigger zone of the brainstem is the likely mechanism of vomiting. Carbidopa is a reversible competitive inhibitor of aromatic L-amino acid decarboxylase (also known as dopa-decarboxylase) that cannot cross the blood brain barrier. It has been used successfully for many years to block the extracerebral synthesis of dopamine and avoid nausea and vomiting in patients with Parkinson's disease taking levodopa. The investigators reasoned that carbidopa could have a similar antiemetic effect in patients with FD. The investigators propose to conduct a pilot trial to assess the safety, tolerability and efficacy of carbidopa for the treatment of nausea in patients with FD. The pilot trial will recruit 25 patients with FD who complain of severe nausea that affects their quality of life. The trial will be divided into two consecutive, but independent parts. Part 1, will address the safety and tolerability of carbidopa in patients with FD using an open-label dose titration phase followed by 4-weeks of open-label treatment. Part 2, will address the efficacy of carbidopa for the treatment of nausea in patients with FD using a randomized, placebo controlled, double blind, 4-week cross over design. The investigators hope to demonstrate that carbidopa is a safe, well-tolerated drug that blocks the peripheral formation of dopamine and thus prevents dopamine-induced nausea and vomiting attacks in patients with FD.
The purpose of this study is to evaluate if the variability of biological signals, such as heart rate and temperature, can predict weaning from mechanical ventilation in patients with failure to wean.
This is a study to compare subject response and symptoms resulting from administration of three clinical assessments. * The 3 assessments are 1. passive upright tilt table testing, 2. quantitative sudomotor axon reflex testing (QSART)and 3. punch biopsy. The comparison of results will be from two subject groups: - Group A, the migraine suffering patient with or without aura - Group B, the migraine suffering patient with or without aura who has diagnosed orthostatic intolerance (i.e.,feeling dizzy or faint when making a body position change).
Autonomic dysreflexia in high spinal cord-injured can be initiated by a full bladder or bowel, or when trying to empty either. This randomised study aims at evaluating whether irrigation procedure or digital stimulation or evacuation of the rectum is less provocative of autonomic dysreflexia. Participants have their bowels emptied on different days, in the morning fasting. Bladder filling with sterile saline water is evaluated on a third day as a control.
The purpose of this study is to measure the prevalence and severity of cardiac autonomic neuropathy (CAN), diabetic autonomic neuropathy (DAN) which in non-diabetics is termed advanced nervous system (ANS) dysfunction, and autonomic dysfunction as well as the overall sympathovagal balance (SB) in the CEFH population of diabetic patients versus non-diabetic patients undergoing elective vitreoretinal surgery.
This study investigates the relationship between autonomic dysfunction and chronic inflammation in hemodialysis patients.
This study is aimed at determining if the drug Atomoxetine (Strattera-used to treat Attention Deficit Hyperactivity Disorder(ADHD) has effects on the body's ability to defend itself against low blood sugar.
This study (https://pdrisk.ninds.nih.gov) will determine if people who have risk factors for Parkinson disease (PD) have biomarkers (objective ways to measure a disease process) that show that the disease process is actually going on, and if people who have abnormal biomarkers go on to develop PD during several years of follow-up. Biomarkers of Parkinson disease (PD) might identify people who are healthy now but may develop the disease later in life. Healthy volunteers and people who have certain risk factors for developing PD who are between 18 and 70 years of age may be eligible for this study. People with the following risk factors are included: - Family history of PD - Loss of sense of smell - Fall in blood pressure when standing up - REM behavior disorder (a type of sleep disturbance) Participants undergo the following tests and procedures: - Screening examination - Medical and neurological history and physical examination - Tests or rating scales for movement, sense of smell, mood, attention, fatigue, pain, and thinking. - Measurement of blood pressure and pulse rate while lying down and then standing up - Blood draw for genetic testing - Inpatient testing at the NIH Clinical Center for 2-3 days, including: - Measurements while blowing against a resistance - Measurements of blood pressure and pulse rate - Blood draws for levels of various chemicals - PET and MRI scanning - Lumbar puncture (spinal tap) - Electrocardiogram - Skin electrical conduction test (test of sweat production) - Skin and core temperature measurements - Transcranial ultrasound (sound-wave test of the head) - Follow-up testing (up to five visits in 18-month intervals) to repeat some of the tests listed above, excluding the genetic testing and spinal tap