What is the role of drugs in the etiology of heat stroke?

Updated: Nov 06, 2018
  • Author: Robert S Helman, MD; Chief Editor: Joe Alcock, MD, MS  more...
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Answer

Stimulant drugs, including cocaine and amphetamines, can generate excessive amounts of heat by increasing metabolism and motor activity through the stimulatory effects of dopamine, serotonin, and norepinephrine. The development of heat stroke in individuals intoxicated with stimulants is multifactorial and may involve a complex interaction between dopamine and serotonin in the hypothalamus and the brainstem.

Neuroleptic agents also may elevate body temperature by increasing muscle activity, but, occasionally, these agents may cause neuroleptic malignant syndrome (NMS). NMS is an idiosyncratic reaction characterized by hyperthermia, altered mental status, muscle rigidity, and autonomic instability and appears to be due to excessive contraction of muscles.

Certain drugs, such as inhaled volatile anesthetics and succinylcholine, may result in malignant hyperthermia. In contrast to heat stroke, malignant hyperthermia is believed to be induced by a decreased ability of the sarcoplasmic reticulum to retain calcium, resulting in sustained muscle contraction.


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