What is the pathophysiology of hyperthermia in cocaine toxicity?

Updated: Sep 01, 2018
  • Author: Lynn Barkley Burnett, MD, EdD, LLB(c); Chief Editor: Sage W Wiener, MD  more...
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Answer

Temperature dysregulation is also a problem with cocaine intoxication, as demonstrated by Callaway and Clark, who reported that patients presented with rectal temperatures as high as 45.6°C. [19] Hyperthermia is a marker for severe toxicity, and it is associated with a number of complications, including renal failure, disseminated intravascular coagulation, acidosis, hepatic injury, and rhabdomyolysis.

Because dopamine plays a role in the regulation of core body temperature, increased dopaminergic neurotransmission may contribute to psychostimulant-induced hyperthermia in cocaine users, including those with excited delirium.

D2 receptors are involved with processes that decrease core temperature. The number of D2 receptors in the temperature regulatory centers of the hypothalamus is substantially reduced in persons with excited delirium. These decreases in D2 receptors lead to unopposed increases in temperature mediated through D1 receptors, which are not affected in individuals who die from excited delirium.

Ruttenber et al hypothesize that hyperthermia may result from extensive muscular activity in the setting of warm ambient temperature and, perhaps, humidity in combination with aberrant thermoregulation in the hypothalamus and mesolimbic system. [16] Antagonism of both central and peripheral catecholamine receptors may be required to protect against psychostimulant-induced hyperthermia because peripherally released catecholamines may directly stimulate muscle or other thermogenic tissue.

Cocaine-induced seizures can also contribute to hyperthermia, though cocaine can induce hyperthermia in the absence of seizures. In animal studies, hyperthermia was the most significant parameter in the lethality of continuous cocaine infusion.

Agitation secondary to intoxication or withdrawal increases motor activity, which increases heat production. The patient's volume needs are thereby increased, and, when not met, they lead to decreased renal perfusion. Heat production may also contribute to increased muscle breakdown, resulting in myoglobinuria. Myoglobinuria, in conjunction with decreased renal perfusion, causes acute tubular necrosis.


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