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Paroxysmal sympathetic hyperactivity (PSH) is a syndrome that causes episodes of increased activity of the sympathetic nervous system. Hyperactivity of the sympathetic nervous system can manifest as increased heart rate, increased respiration, increased blood pressure, diaphoresis , and hyperthermia . [ 1 ]
Paroxysmal attacks in various disorders have been reported extensively, and ephaptic coupling of demyelinated nerves has been presumed as one of the underlying mechanisms of this phenomenon. This is supported by the presence of these attacks in multiple sclerosis and tabes dorsalis, which both involve demyelination of spinal cord neurons.
Paroxysmal sympathetic hyperactivity; Past surgical history; Petrograd Standard Hundred, a measure of timber; PlayStation Home; Plurisubharmonic function; Polythematic structured-subject heading system, controlled vocabulary
The symptoms of a sympathetic pheochromocytoma are related to sympathetic nervous system hyperactivity. [10] The classic triad includes headaches (likely related to elevated blood pressure, or hypertension), tachycardia/elevated heart rate, and diaphoresis (excessive sweating, particularly at night, also known as hyperhidrosis). [7]
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The sympathetic nervous system also stimulates the skeletal system and muscular system to pump more blood to those areas to handle the acute stress. Simultaneously, the sympathetic nervous system inhibits the digestive system and the urinary system to optimize blood flow to the heart, lungs, and skeletal muscles.