Akathisia

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Akathisia

ICD-10	G211
ICD-9	781.0, 333.99
OMIM	[1]
DiseasesDB	32479
MedlinePlus	[2]
eMedicine	neuro/362 re TD, & for Neuroleptic toxicity emerg/338
MeSH	{{{MeshNumber}}}

Akathisia, or acathisia, is an unpleasant subjective sensation of "inner" restlessness that manifests itself with an inability to sit still or remain motionless, the sufferer often needing to walk up and down hence its origin [ Ancient Greek α (a), without, not + κάθισις (káthisis), sitting].

Causes

Its most common cause is as a side effect of medications, mainly neuroleptic antipsychotics especially the phenothiazines (such as perphenazine and chlorpromazine), thioxanthenes (such as flupenthixol and zuclopenthixol) and butyrophenones (such as haloperidol (Haldol)), and rarely, antidepressants. Akathisia can also, to a lesser extent, be caused by Parkinson disease-related syndromes.

Akathisia may range in intensity from a mild sense of disquiet or anxiety (which may be easily overlooked) to a total inability to sit still, accompanied by overwhelming anxiety, malaise, and severe dysphoria (manifesting as an almost indescribable sense of terror and doom). Partly because the condition is difficult for the patient to describe, it is often misdiagnosed. When misdiagnosis occurs in antipsychotic neuroleptic-induced akathisia, more antipsychotic neuroleptics may be prescribed, potentially worsening the symptoms. . High functioning patients have decribed the feeling as a sense of inner tension and torment or chemical torture from the inside out.

Akathisia makes some patients act out in violent fits of rage throwing and breaking things or harming others. Ironically antipsychotic drugs are many times prescribed as “mood stabilizers” but then have the opposite intended effect, which often leads to increased doses further escalating the symptoms when the intent was to ameliorate the symptoms.

Assessment

The presence and severity of akathisia can be measured using the Barnes Akathisia Scale.

Description

Healy, et. al. (2006), described the following regarding akathisia: tension, insomnia, a sense of discomfort, motor restlessness, and marked anxiety and panic. Increased labile affect can result, such as weepiness. Interestingly, in some people the opposite response to SSRIs occurs, in the form of emotional blunting; but sufficient clinical research has not yet been made in this area.

Jack Henry Abbot (1981) described the effects of akathisia produced by neuroleptic drugs:

These drugs, in this family, do not calm or sedate the nerves. They attack. They attack from so deep inside you, you cannot locate the source of the pain ... The muscles of your jawbone go berserk, so that you bite the inside of your mouth and your jaw locks and the pain throbs. For hours every day this will occur. Your spinal column stiffens so that you can hardly move your head or your neck and sometimes your back bends like a bow and you cannot stand up. The pain grinds into your fiber ... You ache with restlessness, so you feel you have to walk, to pace. And then as soon as you start pacing, the opposite occurs to you; you must sit and rest. Back and forth, up and down you go in pain you cannot locate, in such wretched anxiety you are overwhelmed, because you cannot get relief even in breathing.

—Jack Henry Abbot, In the Belly of the Beast (1981/1991). Vintage Books, 35-36. Quoted in Robert Whitaker, Mad in America (2002, ISBN 0738207993), 187.

In the most severe cases, dysphoria can be so severe that the patient is compelled to take action, leading, possibly, to suicide attempts.

Treatment non-compliance is a common consequence of neuroleptic-induced akathisia. At the extreme end of non-compliance, patients who have been treated with neuroleptic antipsychotics for psychotic episodes or prochlorperazine for nausea may rarely abscond from hospitals or emergency rooms due to this disconcerting sensation.

Causes

Akathisia is most often seen as a side effect of certain drugs. It is by far most commonly seen in the use of antipsychotic medications, as well as other neuroleptic drugs.

• Non-sedating antipsychotics such as haloperidol (Haldol), droperidol, pimozide, trifluoperazine, amisulpride, risperidone, and aripiprazole (Abilify). Much less common in sedating antipsychotics such as olanzapine (Zyprexa®) or chlorpromazine where anticholinergic and antihistaminergic effects counteract akathisia to a degree.
• SSRIs, such as fluoxetine (Prozac). It has also been documented with the use of paroxetine (Paxil). Akathisia has been studied as the mechanism by which SSRI-induced suicidality occurs.
• Other antidepressants, such as the tricyclics and trazodone (Desyrel).
• Certain anti-emetic drugs, particularly the dopamine blockers, such as metoclopramide (Reglan) and prochlorperazine (Compazine).
• Certain drugs of abuse, such as GHB, methamphetamine and MDMA when administered in excessive doses.

The 2006 U.K. study by Healy, Herxheimer, and Menkes observed that akathisia is often miscoded in antidepressant clinical trials as "agitation, emotional lability, and hyperkinesis (overactivity)". The study further points out that misdiagnosis of akathisia as simple motor restlessness occurs, but that this is more properly classed as dyskinesia. Healy, et. al., further show links between antidepressant-induced akathisia and violence, including suicide, as akathisia can "exacerbate psychopathology." The study goes on to state that there is extensive clinical evidence correlating akathisia with SSRI use, showing that approximately ten times as many patients on SSRIs as those on placebos showed symptoms severe enough to drop out of a trial (5.0% compared to 0.5%).

Treatment

Treatment includes the discontinuation or reduction of dose of the causative agent.

The most common treatment for antipsychotic akathisia is the anticholinegic medication benztropine (Cogentin). But since benztropine is for extrapyramidal side effects such as muscle spasms and tremors it is not effective in treating akathisia which is not a true extrapyramidal side effect.

Akathisia can be reduced by administering other drugs, though effectiveness can vary with more severe cases resistant to most drug treatment. Benzodiazepines like clonazepam (Klonopin) are effective. Some consider the drug of choice for the treatment of akathisia to be beta-blockers such as propranolol (Inderal) or metoprolol. The antihistamine cyproheptadine is also effective, though with shorter effect than beta blockers.

Recent studies have shown that vitamin B₆ is effective for the treatment of neuroleptic-induced akathisia. Many also claim marijuana can ease symptoms of akathisia.

See also

• Agitation (emotion)
• Anxiety
• Psychomotor agitation
• Restlessness

External links

• DSM-IV: Neuroleptic Induced Acute Akathisia at behavenet.com
• Information on treating this condition and copies of original research papers at akathisiasupport.org
• Akathisia and SSRI-Induced Suicide
• Nasrallah H, Brecher M, Paulsson B (2006). Placebo-level incidence of extrapyramidal symptoms (EPS) with quetiapine in controlled studies of patients with bipolar mania. Bipolar Disord 8 (5 Pt 1): 467-74.