The American Journal Of The Medical Sciences - UserLogin Both these disorders are also sometimes referred to as postural orthostatictachycardia syndrome (POTS) or sympathotonic orthostatic intolerance. http://www.amjmedsci.com/pt/re/ajms/fulltext.00000441-199902000-00001.htm
Pagina Nueva 1 of tests that elucidate mast cell activation as a novel cause of posturalorthostatic tachycardia syndrome (POTS) and orthostatic hypotension (OH). http://www.saha.org.ar/temas/hipotensionortos.htm
Extractions: The Causes of Postural Cardiovascular Disorders Ziegler , Michael G.; Rizos, Demetri P. Shibao et al. describe a series of tests that elucidate mast cell activation as a novel cause of postural orthostatic tachycardia syndrome (POTS) and orthostatic hypotension (OH). Because blood pressure control systems are redundant, patients with OH often have more than a single cause of their postural symptoms, and elucidating these causes can be challenging. The study by Shibao et al illustrates this because all but one of their subjects were premenopausal females. Estrogen and histamine vasodilate, and the patients who developed POTS were predominantly those made more susceptible to excessive vasodilation by age and sex. There are so many syndromes that cause orthostatic symptoms that approaching the problem through differential diagnosis is needlessly difficult. Analysis of the cardiovascular physiology of patients with OH is a better way to elucidate etiology and is also more likely to reveal when there are multiple reasons for impaired blood pressure control. The cardiovascular systems used to maintain blood pressure during upright posture are most simply pictured as a volume of fluid, a pump, vessels that resist fluid flow, and a system that regulates pump speed and resistance to flow. The corresponding anatomic parts of this system are blood volume, the heart, resistance blood vessels, and the autonomic nervous system. It is possible to test each of these components responsible for maintenance of blood pressure to determine the defect(s) causing POTS or OH. This simple physiological approach is useful in the outpatient setting to diagnose a single patient and in the clinical research laboratory.
Pots: An Overview Dysautonomia Information Network. POTS Place A Guide to postural OrthostaticTachycardia syndrome. POTS An overview. Medical disclaimer http://www.potsplace.com/pots_an_overview.htm
Extractions: Standing up is something most of us take for granted; we've been doing it since childhood. Our bodies automatically adjust to the pull of gravity by increasing vascular tone, heart rate and cardiac output. Blood vessels contract, heart rates increase and our systolic blood pressure remains the same or decreases slightly while diastolic pressure However, the simple act of standing up can be a challenge for some people. There are disorders that affect the body's ability to appropriately adjust to the pull of gravity. When the body cannot effectively adjust to upright posture a person is said to have orthostatic intolerance. Postural orthostatic tachycardia syndrome (POTS) is a disorder characterized by orthostatic intolerance. Postural orthostatic tachycardia syndrome is defined by excessive heart rate increments upon upright posture. A person with POTS will experience heart rates that increase 30 beats or more per minute upon standing and/or increase to 120 beats or more per minute upon standing (Grubb, 2000). These exaggerated heart rate increases usually occur within 10 minutes of rising.
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Entrez PubMed Autonomic nervous system dysfunction in adolescents with postural orthostatictachycardia syndrome and chronic fatigue syndrome is characterized by http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2
Association For Patient-Oriented Research The purposes of this clinical research are 1) to study why patients with PosturalOrthostatic tachycardia syndrome (POTS) are primarily young women; http://www.mc.vanderbilt.edu/gcrc/aas/patient resources/Ongoingstudies.html
Extractions: Ongoing Clinical Studies Clinical research is needed to advance our knowledge about the cause of disease and to develop new treatments. Although progress is being done, medical research is often a slow process and it is not certain that patients who volunteer will directly benefit from the research they participate in. It is important that they understand the potential benefits and risks before deciding to participate. In the following listing, a brief description of ongoing clinical studies is provided, along with contact information. Physicians and patients should recognize that the American Autonomic Society does not endorse or recommend particular studies. You can obtain general information about clinical research here If you are a member of the society, and want to be included in this listing, click here AL AR AZ CA ... WV Canada Colombia Dominican Republic Germany ... United Kingdom Research Study on Dizziness
