Peripheral nervous system disorders.pdf

Peripheral nervous system disorders

Source: Wikipedia. Pages: 56. Chapters: Accessory nerve disorder, Anesthesia dolorosa, Anti-MAG peripheral neuropathy, Autonomic dysreflexia, Axillary nerve dysfunction, Axillary nerve palsy, Charcot-Marie-Tooth disease, CMV polyradiculomyelopathy, Congenital insensitivity to pain with anhidrosis, Diabetic neuropathy, Dysautonomia, Facial nerve paralysis, Familial dysautonomia, Hereditary sensory and autonomic neuropathy, Horners syndrome, Multiple system atrophy, Nerve compression syndrome, Nerve injury, Orthostatic hypotension, Orthostatic intolerance, Piriformis syndrome, Plexopathy, Polyneuropathy, Postherpetic neuralgia, Postural orthostatic tachycardia syndrome, Primary autonomic failure, Pronator teres syndrome, Proximal diabetic neuropathy, Pudendal nerve entrapment, Pure autonomic failure, Radial neuropathy, Radiculopathy, Sciatica, Thoracic outlet syndrome, Ulnar neuropathy, Wartenbergs Syndrome, Winged scapula. Excerpt: Postural orthostatic tachycardia syndrome (POTS, also postural tachycardia syndrome) is a condition of dysautonomia, to be more specific orthostatic intolerance, in which a change from the supine position to an upright position causes an abnormally large increase in heart rate, called tachycardia. Several studies show a decrease in cerebral blood flow with systolic and diastolic cerebral blood flow (CBF) velocity decreased 44% and 60%, respectively. People with POTS have problems maintaining homeostasis when changing position, i.e. moving from one chair to another or reaching above their heads. Many also experience symptoms when stationary or even while lying down. Symptoms present in various degrees of severity depending on the individual. POTS can be severely debilitating. Some afflicted individuals are unable to attend school or work and for especially severe cases, they are completely incapacitated. The hallmark symptom of POTS is an increase in heart rate from the supine to upright position of more than 30 beats per minute or to a heart rate greater than 120 beats per minute within 12 minutes of head-up tilt. This tachycardic response is sometimes accompanied by a decrease in blood flow to the brain and a wide variety of symptoms associated with cerebral hypoperfusion. Decreased cerebral perfusion may promote the following: Chronic or acute hypoperfusion of tissues and organs in the upper parts of the body are thought to cause the following symptoms: Autonomic dysfunction is thought to cause additional gastrointestinal symptoms: Cerebral hypoperfusion, when present, can cause cognitive and emotive difficulties. Symptoms that persist in the supine (recumbent) state are difficult to attribute to cerebral hypoperfusion Inappropriate levels of epinephrine and norepinephrine lead to anxiety-like symptoms: Symptoms of POTS overlap considerably with those of generalized anxiety disorder, and a misdiagnosis of an anxiety disorder is not uncommon. The primary causal m

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Peripheral nervous system disorders.pdf


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