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The neuroleptic malignant syndrome.

R A Smego, D T Durack

    Archives of Internal Medicine
    |June 1, 1982
    PubMed
    Summary

    Neuroleptic Malignant Syndrome (NMS) is a rare, serious reaction to antipsychotic drugs, characterized by fever, rigidity, and altered consciousness. Early diagnosis and drug withdrawal are vital due to its significant mortality risk.

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    Area of Science:

    • Neurology
    • Pharmacology
    • Internal Medicine

    Background:

    • Neuroleptic Malignant Syndrome (NMS) is a rare, idiosyncratic reaction to antipsychotic medications.
    • It presents with hyperpyrexia, altered consciousness, muscular rigidity, and autonomic dysfunction.
    • NMS is linked to dopaminergic system disturbances in the basal ganglia and hypothalamus.

    Purpose of the Study:

    • To highlight the key features and diagnostic considerations of Neuroleptic Malignant Syndrome.
    • To emphasize the importance of early recognition and management of NMS.
    • To underscore the underdiagnosis of NMS among internists.

    Main Methods:

    • Literature review of NMS cases and associated neuroleptic drugs.
    • Analysis of clinical presentation, laboratory findings, and pathophysiology.
    • Discussion of diagnostic criteria and differential diagnosis.

    Main Results:

    • NMS is associated with phenothiazines, butyrophenones, and thioxanthenes, particularly haloperidol.
    • Common laboratory findings include leukocytosis, elevated creatine phosphokinase (CPK), and liver enzymes.
    • The syndrome occurs at therapeutic doses and is unrelated to treatment duration.

    Conclusions:

    • NMS is likely underdiagnosed, especially by internists, and should be considered in febrile patients on neuroleptics.
    • Early diagnosis and immediate withdrawal of neuroleptic medication are critical for patient survival.
    • Supportive care in an intensive care unit may be necessary for managing severe NMS cases.

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