Neuroleptic malignant syndrome: Difference between revisions

Jump to navigation Jump to search
Line 41: Line 41:
* [[Prochlorperazine]]
* [[Prochlorperazine]]
* [[Risperidone]]
* [[Risperidone]]
* [[Trifluoperazine]]


==Differential Diagnosis==
==Differential Diagnosis==

Revision as of 20:17, 22 January 2015

Neuroleptic malignant syndrome
ICD-10 G21.0
ICD-9 333.92
DiseasesDB 8968

WikiDoc Resources for Neuroleptic malignant syndrome

Articles

Most recent articles on Neuroleptic malignant syndrome

Most cited articles on Neuroleptic malignant syndrome

Review articles on Neuroleptic malignant syndrome

Articles on Neuroleptic malignant syndrome in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Neuroleptic malignant syndrome

Images of Neuroleptic malignant syndrome

Photos of Neuroleptic malignant syndrome

Podcasts & MP3s on Neuroleptic malignant syndrome

Videos on Neuroleptic malignant syndrome

Evidence Based Medicine

Cochrane Collaboration on Neuroleptic malignant syndrome

Bandolier on Neuroleptic malignant syndrome

TRIP on Neuroleptic malignant syndrome

Clinical Trials

Ongoing Trials on Neuroleptic malignant syndrome at Clinical Trials.gov

Trial results on Neuroleptic malignant syndrome

Clinical Trials on Neuroleptic malignant syndrome at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Neuroleptic malignant syndrome

NICE Guidance on Neuroleptic malignant syndrome

NHS PRODIGY Guidance

FDA on Neuroleptic malignant syndrome

CDC on Neuroleptic malignant syndrome

Books

Books on Neuroleptic malignant syndrome

News

Neuroleptic malignant syndrome in the news

Be alerted to news on Neuroleptic malignant syndrome

News trends on Neuroleptic malignant syndrome

Commentary

Blogs on Neuroleptic malignant syndrome

Definitions

Definitions of Neuroleptic malignant syndrome

Patient Resources / Community

Patient resources on Neuroleptic malignant syndrome

Discussion groups on Neuroleptic malignant syndrome

Patient Handouts on Neuroleptic malignant syndrome

Directions to Hospitals Treating Neuroleptic malignant syndrome

Risk calculators and risk factors for Neuroleptic malignant syndrome

Healthcare Provider Resources

Symptoms of Neuroleptic malignant syndrome

Causes & Risk Factors for Neuroleptic malignant syndrome

Diagnostic studies for Neuroleptic malignant syndrome

Treatment of Neuroleptic malignant syndrome

Continuing Medical Education (CME)

CME Programs on Neuroleptic malignant syndrome

International

Neuroleptic malignant syndrome en Espanol

Neuroleptic malignant syndrome en Francais

Business

Neuroleptic malignant syndrome in the Marketplace

Patents on Neuroleptic malignant syndrome

Experimental / Informatics

List of terms related to Neuroleptic malignant syndrome

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Jesus Rosario Hernandez, M.D. [2]

Keywords and synonyms: NMS

Overview

Neuroleptic malignant syndrome (NMS) is a life-threatening, neurological disorder most often caused by an adverse reaction to neuroleptic or antipsychotic drugs.

Historical Perspective

NLM was known about as early as 1956, shortly after the introduction of the first phenothiazines, and is derived from the French syndrome malin des neuroleptiques.[1]

Pathophysiology

The mechanism of NMS is thought to depend on decreased levels of dopamine due to:

Causes

NMS is caused almost exclusively by antipsychotics, including all types of neuroleptic medicines along with newer antipsychotic drugs.[3] The higher the dosage, the more common the occurrence. Rapid and large increases in dosage can also trigger the development of NMS. Other drugs, environmental or psychological factors, hereditary conditions, and specific demographics may cause greater risk, but to date no conclusive evidence has been found to support this. The disorder typically develops within two weeks of the initial treatment with the drug, but may develop at any time the drug is being taken. NMS may also occur in people taking a class of drugs known as dopaminergics when the dosage is reduced (i.e Levodopa).

Drug Causes

Differential Diagnosis

NMS and Serotonin Syndrome

The clinical features of NMS and serotonergic syndrome are very similar. This can make differentiating them very difficult.[5]

Features, classically present in NMS, that are useful for differentiating the two syndromes are:[6]

  • Fever
  • Muscle rigidity
  • Laboratory values (WBC and CK)

Risk Factors

  • Antipsychotic drug administration
  • Agitation
  • Dehydration
  • Iron deficiency
  • ExhaustionDiagnostic and statistical manual of mental disorders : DSM-5. Washington, D.C: American Psychiatric Association. 2013. ISBN 0890425558.

Natural History, Complication and Prognosis

As with most illnesses, the prognosis is best when identified early and treated aggressively. In these cases NMS is usually not fatal, although there is currently no agreement on the exact mortality rate for the disorder. Studies have given the disorder a mortality rate as low as 5% and as high as 76%, although most studies agree that the correct percentage is in the lower spectrum, perhaps between 10% - 15%. Re-introduction to the drug that originally caused NMS to develop may also trigger a recurrence, although in most cases it does not.

Poor prognostic factors include:

  • Administration of dopamine antagonists
  • Administration of new atypical antipsychotics[4]

Diagnosis

Diagnosis Criteria

DSM-V Diagnostic Criteria for Neuroleptic Malignant Syndrome[4]

  • Patients have generally been exposed to a dopamine antagonist within 72 hours prior to symptom development.
  • Hyperthermia (>100.4°F or >38.0°C on at least two occasions, measured orally), associated with profuse diaphoresis, is a distinguishing feature of neuroleptic malignant syndrome, setting it apart from other neurological side effects of anti psychotic medications.
  • Extreme elevations in temperature, reflecting a breakdown in central thermoregulation, are more likely to support the diagnosis of neuroleptic malignant syndrome.
  • Creatine kinase elevation of at least four times the upper limit of normal is commonly seen. Changes in mental status, characterized by delirium or altered consciousness ranging from stupor to coma, are often an early sign.
  • Affected individuals may appear alert but dazed and unresponsive, consistent with catatonic stupor. Autonomic activation and instability manifested by tachycardia (rate >25% above baseline), diaphoresis, blood pressure elevation (systolic or diastolic >25% above baseline) or fluctuation (>20 mmHg diastolic change or >25 mmHg systolic change within 24 hours), urinary incontinence, and pallor—may be seen at any time but provide an early clue to the diagnosis.
  • A workup, including laboratory investigation, to exclude other infectious, toxic, metabolic, and neuropsychiatric etiologies or complications is essential.
  • Although several laboratory abnormalities are associated with neuroleptic malignant syndrome, no single abnormality is specific to the diagnosis.
  • Findings from cerebrospinal fluid analysis and neuroimaging studies are generally normal, whereas electroencephalography shows generalized slowing.
  • Autopsy findings in fatal cases have been nonspecific and variable, depending on complications.

Symptoms

The first symptom to develop is usually muscular rigidity, followed by high fever and changes in cognitive functions. Other symptoms can vary, but may be unstable blood pressure, confusion, coma, delirium, muscle tremors, etc. Once symptoms do appear, they rapidly progress and can reach peak intensity in as little as three days. These symptoms can last anywhere from eight hours to forty days.

Laboratory Studies

A raised creatine phosphokinase (CPK) plasma concentration will be reported due to increased muscular activity. The patient may be hypertensive and suffering from a metabolic acidosis.

EEG Studies

A non-generalised slowing on an EEG is reported in around 50% of cases.

Unfortunately, symptoms of NMS are sometimes misinterpreted by doctors as symptoms of mental illness, delaying treatment.[7]

Mnemonic

A mnemonic used to remember the features of NMS is: FEVER.[8]

Treatment

Although treatment is not always necessary, it will help to cure the disease and prevent fatal developments from occurring. The first step in treatment is generally to remove the patient from any neuroleptic or antipsychotic drugs being taken and to treat fever aggressively. Many cases require intensive care, or some kind of supportive care at the minimum. Depending on the severity of the case, patients may require other treatments to contend with specific effects of the disorder. These include circulatory and ventilatory support, the drugs dantrolene sodium, bromocriptine, apomorphine and electroconvulsive therapy (ECT) if medication fails.

References

  1. Friedberg JM. Neuroleptic malignant syndrome. URL: [http://www.idiom.com /~drjohn/biblio.html http://www.idiom.com/~drjohn/biblio.html]. Accessed: July 3, 2006.
  2. Mihara K, Kondo T, Suzuki A; et al. (2003). "Relationship between functional dopamine D2 and D3 receptors gene polymorphisms and neuroleptic malignant syndrome". Am. J. Med. Genet. B Neuropsychiatr. Genet. 117 (1): 57–60. doi:10.1002/ajmg.b.10025. PMID 12555236.
  3. Theodore I. Benzer, MD, PhD (2005). "Neuroleptic Malignant Syndrome". Emedicine.
  4. 4.0 4.1 4.2 Diagnostic and statistical manual of mental disorders : DSM-5. Washington, D.C: American Psychiatric Association. 2013. ISBN 0890425558.
  5. Christensen V, Glenthøj B (2001). "[Malignant neuroleptic syndrome or serotonergic syndrome]". Ugeskr Laeger. 163 (3): 301–2. PMID 11219110.
  6. Birmes P, Coppin D, Schmitt L, Lauque D (2003). "Serotonin syndrome: a brief review". CMAJ. 168 (11): 1439–42. PMID 12771076. Full Free Text.
  7. Stacy Milbouer, "Quest for the truth", Nashua Telegraph http://www.nashuatelegraph.com/apps/pbcs.dll/article?AID=/20050424/NEWS01/104240081
  8. Identify neuroleptic malignant syndrome. schizophrenia.com URL: http://www.schizophrenia.com/sznews/archives/002054.html. Accessed: July 2, 2006.

Template:Diseases of the nervous system

Template:WikiDoc Sources