NEUROLEPTIC MALIGNANT SYNDROME
Neuroleptic malignant syndrome is a rare
complica-tion of antipsychotic therapy that may occur hours or weeks after drug
administration. Meperidine and metoclopramide can also precipitate the
disorder. The mechanism is related to dopamine blockade in the basal ganglia
and hypothalamus and impairment of thermoregulation. In its most severe form,
the pre-sentation is similar to that of malignant hyperther-mia. Muscle
rigidity, hyperthermia, rhabdomyolysis, autonomic instability, and altered
consciousness are seen. Creatine kinase levels are often high. The mortality rate
approaches 20% to 30%, with deaths occurring primarily as a result of renal
failure or arrhythmias. Treatment with dantrolene seems to be effective;
bromocriptine, a dopamine agonist, may also be effective. Differential
diagnoses include malignant hyperthermia and serotonin syndrome.
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