View source for Paroxysmal sympathetic hyperactivity

==Background==
===Pathophysiology===
* Thought to be damage to inhibitory sympathetic centres of the diencephalon
* This allows spinal cord stimuli to be amplify through uninhibited positive feedback

===Epidemiology===
* 80% of patients with PSH have traumatic brain injury

==Clinical Manifestations==
* Episodes of increased sympathetic output triggered by external stimulation
* Symptoms most commonly include [[Causes::tachycardia]], [[Causes::diaphoresis]], and increased motor activity
* Other symptoms include [[Causes::fever]] (up to 70%), [[Causes::hypertension]], and [[Causes::tachypnea]]

==Management==
* Treated with beta blockers, especially [[Is treated by::propanolol]]
* May add [[Is treated by::clonidine]] for better blood pressure control

[[Category:Fever syndromes]]