Serotonin syndrome, neuroleptic malignant syndrome, anticholinergic toxidrome and malignant hyperthermia can present similarly with hyperthermia, tachycardia, confusion and hypertension. What clinical characteristics help distinguish between these entities?

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Source

Boyer, E.  and Shanahan, M.  "The Serotonin Syndrome"  N Engl J Med.  March 17, 2005.