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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 ]
The sympathetic nervous system's primary process is to stimulate the body's fight or flight response. It is, however, constantly active at a basic level to maintain homeostasis. [4] The sympathetic nervous system is described as being antagonistic to the parasympathetic nervous system.
This medical condition characterized by severe, frequent and uncontrollable reddening of the face, which is often unprovoked. It is unknown why people are afflicted with this condition, but it is appears to be the result of an overactive sympathetic nervous system, an automatic response which sufferers have no mental control over.
Excessive activation of the vagal nerve during emotional stress, which is a parasympathetic overcompensation for a strong sympathetic nervous system response associated with stress, can also cause vasovagal syncope due to a sudden drop in cardiac output, causing cerebral hypoperfusion. Vasovagal syncope affects young children and women more ...
An overactive sympathetic nervous system, leading to increased stress responses. It is also known that hypertension is highly heritable and polygenic (caused by more than one gene) and a few candidate genes have been postulated in the etiology of this condition.
Hyperreflexia is overactive or overresponsive bodily reflexes. Examples of this include twitching and spastic tendencies, which indicate disease of the upper motor neurons and the lessening or loss of control ordinarily exerted by higher brain centers of lower neural pathways. [citation needed] Spinal cord injury is the most common cause of ...
Sweating after sympathetic surgery is a reflex cycle between the sympathetic system and the anterior portion of the hypothalamus. Reflex sweating will not happen if hand sweating can be stopped without interrupting sympathetic tone to the human brain. [7] Compensatory hyperhidrosis is aberrant sympathetic nervous system functioning. The only ...
Thyroid hormone is critical to normal function of cells. In excess, it both overstimulates metabolism and disrupts the normal functioning of sympathetic nervous system, causing "speeding up" of various body systems and symptoms resembling an overdose of epinephrine (adrenaline).