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Dysautonomia, autonomic failure, or autonomic dysfunction is a condition in which the autonomic nervous system (ANS) does not work properly. This may affect the functioning of the heart , bladder , intestines , sweat glands , pupils , and blood vessels.
Postural orthostatic tachycardia syndrome (POTS) is a condition characterized by an abnormally large increase in heart rate upon sitting up or standing. [1] POTS is a disorder of the autonomic nervous system that can lead to a variety of symptoms, [10] including lightheadedness, brain fog, blurred vision, weakness, fatigue, headaches, heart palpitations, exercise intolerance, nausea ...
Casanova has also been studying the autonomic nervous system in autistic individuals. He found that the sympathetic branch of the ANS is overactive in autistic children, which leads to higher levels of anxiety. Additionally, he believes that TMS and neurofeedback can reduce autonomic dysfunction that is linked to certain foods. [12]
In 2021, 2022 and 2024 he again received UT's President's Award for Creative and Scholarly Activity. In 2024 he was given a joint appointment in Neurology in recognition of his contributions to Autonomic Neuroscience. Grubb has been recognized as one of "America's Top Doctors" for 20 years in a row.
Orthostatic intolerance (OI) is the development of symptoms when standing upright that are relieved when reclining. [1] There are many types of orthostatic intolerance. OI can be a subcategory of dysautonomia, a disorder of the autonomic nervous system [2] occurring when an individual stands up. [3]
Sudomotor dysfunction is one of the most common and earliest neurophysiological manifestations of small fiber neuropathies. [3] In some instances, the small fibers of the autonomic nervous system can be affected, leading to urinary or bowel problems, episodes of rapid heartbeat (palpitations), dry eyes or mouth, or abnormal sweating.
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