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Concept
Neuroleptic malignant syndrome
Summary
Neuroleptic malignant syndrome (NMS) is a rare but life-threatening reaction that can occur in response to neuroleptic or antipsychotic medication. Symptoms include high fever, confusion, rigid muscles, variable blood pressure, sweating, and fast heart rate. Complications may include rhabdomyolysis, high blood potassium, kidney failure, or seizures.
Any medications within the family of neuroleptics can cause the condition, though typical antipsychotics appear to have a higher risk than atypicals, specifically first generation antipsychotics like haloperidol. Onset is often within a few weeks of starting the medication but can occur at any time. Risk factors include dehydration, agitation, and catatonia.
Rapidly decreasing the use of levodopa or other dopamine agonists, such as pramipexole, may also trigger the condition. The underlying mechanism involves blockage of dopamine receptors. Diagnosis is based on symptoms.
Management includes stopping the triggering medication, rapid cooling, and starting other medications. Medications used include dantrolene, bromocriptine, and diazepam. The risk of death among those affected is about 10%. Rapid diagnosis and treatment is required to improve outcomes. Many people can eventually be restarted on a lower dose of antipsychotic.
As of 2011, among those in psychiatric hospitals on neuroleptics about 15 per 100,000 are affected per year (0.015%). In the second half of the 20th century rates were over 100 times higher at about 2% (2,000 per 100,000). Males appear to be more often affected than females. The condition was first described in 1956.
NMS symptoms include:
Increased body temperature >38 °C (>100.4 °F), or
Confused or altered consciousness
Excessive sweating
Rigid muscles
Autonomic imbalance
The first symptoms of neuroleptic malignant syndrome are usually muscle cramps and tremors, fever, symptoms of autonomic nervous system instability such as unstable blood pressure, and sudden changes in mental status (agitation, delirium, or coma).
Official source
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