Not to be confused with dyskinetic cerebral palsy.
| Tardive dyskinesia |
| Classification and external resources |
| ICD-10 |
G24.0 |
| ICD-9 |
333.85 |
| OMIM |
272620 |
| DiseasesDB |
12909 |
| MedlinePlus |
000685 |
| eMedicine |
neuro/362 |
Tardive dyskinesia / / is a difficult-to-treat and often incurable form of dyskinesia, a disorder resulting in involuntary, repetitive body movements. In this form of dyskinesia, the involuntary movements are tardive, meaning they have a slow or belated onset.[1] This neurological disorder most frequently occurs as the result of long-term or high-dose use of antipsychotic drugs,[Note 1] or in children and infants as a side effect from usage of drugs for gastrointestinal disorders.[Note 2][2]
Contents
- 1 Features
- 2 Cause
- 3 Treatment
- 4 Prevention
- 5 Epidemiology
- 6 Notes
- 7 References
Features
Tardive dyskinesia is characterized by repetitive, involuntary, purposeless movements. Some examples of these types of involuntary movements include:[3]
- Grimacing
- Tongue movements
- Lip smacking
- Lip puckering
- Pursing of the lips
- Excessive eye blinking
Rapid, involuntary movements of the limbs, torso, and fingers may also occur.[4] In some cases, an individual's legs can be so affected that walking becomes difficult or impossible.[5] These symptoms are the opposite of patients who are diagnosed with Parkinson's disease. Parkinson's patients have difficulty moving, whereas tardive dyskinesia patients have difficulty not moving.[6]
Respiratory irregularity, such as grunting and difficulty breathing, is another symptom associated with tardive dyskinesia, although studies have shown that the prevalence rate is relatively low.[7]
Tardive dyskinesia is often misdiagnosed as a mental illness rather than a neurological disorder,[8] and as a result patients are prescribed neuroleptic drugs, which enhance the probability that the patient will develop a severe and disabling case, and may even experience a shorter survival period.[9]
Other closely related neurological disorders have been recognized as variants of tardive dyskinesia. Tardive dystonia is similar to standard dystonia but permanent. Tardive akathisia involves painful feelings of inner tension and anxiety and a compulsive drive to move the body. In some extreme cases, afflicted individuals experience so much internal torture that they lose their ability to sit still. Tardive tourettism is a tic disorder featuring the same symptoms as Tourette syndrome. The two disorders are extremely close in nature and often can only be differentiated by the details of their respective onsets. Tardive myoclonus, a rare disorder, presents as brief jerks of muscles in the face, neck, trunk, and extremities.[6]
AIMS Examination This test is used when psychotropic medications have been prescribed because patients sometimes develop tardive dyskinesia due to prolonged use of antipsychotic medications. Abnormal involuntary movement scale (AIMS) examination is a test used to identify the symptoms of tardive dyskinesia (TD). The test is not meant to tell whether there is an absence or presence of tardive dyskinesia. It just scales to level of symptoms indicated by the actions observed. The levels range from none to severe. The AIMS examination was constructed in the 1970s to measure involuntary facial, trunk, and limb movements. It is best to do this test before and after the administration of the psychotropic drugs. Taking the AIMS consistently can help to track severity of TD over time.[10][11]
Cause
Tardive dyskinesia was first described in the 1950s shortly after the introduction of chlorpromazine and other antipsychotic drugs.[12] However, the exact mechanism of the disorder remains largely uncertain. The most compelling line of evidence suggests that tardive dyskinesia may result primarily from neuroleptic-induced dopamine supersensitivity in the nigrostriatal pathway, with the D2 dopamine receptor being most affected. Neuroleptics act primarily on this dopamine system, and older neuroleptics, which have greater affinity for the D2 binding site, are associated with high risk for tardive dyskinesia.[13] The D2 hypersensitivity hypothesis is also supported by evidence of a dose-response relationship, withdrawal effects, studies on D2 agonists and antagonists, animal studies, and genetic polymorphism research.[13]
Given similar doses of the same neuroleptic, differences among individuals still exist in the likelihood of developing tardive dyskinesia. Such individual differences may be due to genetic polymorphisms, which code for D2 receptor binding site affinity, or prior exposure to environmental toxins. Decreased functional reserve or cognitive dysfunction, associated with aging, mental retardation, alcohol and drug abuse, or traumatic head injuries, has also been shown to increase risk of developing the disorder among those treated with neuroleptics.[13] Antipsychotic drugs can sometimes camouflage the signs of tardive dyskinesia from occurring in the early stages; this can happen from the individual having an increased dose of an antipsychotic drug. Often the symptoms of tardive dyskinesia are not apparent until the individual comes off of the antipsychotic drugs; however, when tardive dyskinesia worsens, the signs become visible.[14]
Other dopamine antagonists and antiemetics can cause tardive dyskinesia, such as metoclopramide and promethazine, used to treat gastrointestinal disorders. Atypical antipsychotics such as risperidone, olanzapine, clozapine, quetiapine, aripiprazole and ziprasidone are considered lower-risk for causing TD than their typical counterparts with their relative rates of TD of 13.1% and 32.4% respectively in short-term trials with haloperidol being the main typical antipsychotic utilised in said trials.[15] Quetiapine and clozapine are considered the lowest risk agents for precipitating TD.[15] From 2008, there have been reported cases of the anti-psychotic medication aripiprazole, a partial agonist at D2 receptors, leading to tardive dyskinesia.[16] As of 2013, reports of tardive dyskinesia in aripiprazole have grown in number.[17] The available research seems to suggest that the concurrent prophylactic use of a neuroleptic and an antiparkinsonian drug is useless to avoid early extrapyramidal side-effects and may render the patient more sensitive to tardive dyskinesia. Since 1973 the use of these drugs has been found to be associated with the development of tardive dyskinesia.[18][19]
Risk factors
An increased risk of tardive dyskinesia has been associated with smoking in some studies,[20][21] although a negative study does exist.[22] There seems to be a cigarette smoke-exposure-dependent risk for TD in antipsychotic-treated patients.[23] Elderly patients are also at a heightened risk for developing TD,[3] as are females and those with organic brain injuries or diabetes mellitus and those with the negative symptoms of schizophrenia.[15] TD is also more common in those that experience acute neurological side effects from antipsychotic drug treatment.[15] Racial discrepancies in TD rate also exist, with Asian and Fillipino populations having a lower incidence of TD when controlled for antipsychotic drug exposure.[3] Certain genetic risk factors for TD have been identified including polymorphisms in the genes encoding the D3, 5-HT2A and 5-HT2C receptors.[24]
Treatment
Currently, the only approved drug for treating tardive dyskinesia and other movement disorders is tetrabenazine, which is a dopamine depleting drug.[4] The related VMAT2 inhibitor, reserpine, has also been tried in one small randomised double-blind placebo-controlled trial as a treatment for TD with success,[25] as has α-methyldopa.[25] Ondansetron (Zofran) has shown some benefit in experimental studies on tardive dyskinesia and a variety of anti-Parkinsonian medications are used such as donepezil,[26][27] baclofen,[28][29][30] and pramipexole.[31] Clonidine may also be useful in the treatment of TD, although dose-limiting hypotension and sedation may hinder its usage.[32] Botox injections are used for minor focal dystonia, but not in more advanced tardive dyskinesia.[33] Benzodiazepines are an effective treatment for TD, however their use is limited by the development of tolerance which requires ever increasing doses of the benzodiazepines to be used to attenuate TD symptoms. The most popular benzodiazepine for the treatment of TD is clonazepam.[34] Vitamin B6 has been reported to be an effective treatment for TD in two randomised double-blind placebo-controlled trials.[35][36] In males, the branched-chain amino acid formula Tarvil, containing the amino acids valine, isoleucine, and leucine in a 3:3:4 ratio was reported as beneficial for motor symptoms in a small, non-blinded study.[37]
Prevention
Primary prevention of tardive dyskinesia is achieved by using the lowest effective dose of a neuroleptic for the shortest time. However, with diseases of chronic psychosis such as schizophrenia, this strategy must be balanced with the fact that increased dosages of neuroleptics are more beneficial in preventing recurrence of psychosis. If tardive dyskinesia is diagnosed, the causative drug should be discontinued. Tardive dyskinesia may persist after withdrawal of the drug for months, years or even permanently.[38][39] Some studies suggest that physicians should consider using atypical antipsychotics as a substitute to typical antipsychotics for patients requiring medication. These agents are associated with fewer neuromotor side effects and a lower risk of developing tardive dyskinesia.[40]
Recent studies have tested the use of melatonin, high dosage vitamins, and different antioxidants in concurrence with antipsychotic drugs (often used to treat schizophrenia) as a way of preventing and treating tardive dyskinesia. Although further research is needed, studies reported a much lower percentage of individuals developing tardive dyskinesia than the current prevalence rate for those taking antipsychotic drugs.[41]
Epidemiology
Tardive dyskinesia most commonly occurs in patients with psychiatric conditions who are treated with antipsychotic medications for many years. The average prevalence rate has been estimated to be around 30% for individuals taking antipsychotic medication, such as that used to treat schizophrenia.[42] A study being conducted at the Yale University School of Medicine has estimated that "32% of patients develop persistent tics after 5 years on major tranquilizers, 57% by 15 years, and 68% by 25 years."[43] More drastic data was found during a longitudinal study conducted on individuals 45 years of age and older who were taking antipsychotic drugs. According to this research study, 26% of patients developed tardive dyskinesia after just one year on the medication. Another 60% of this at-risk group developed the disorder after 3 years, and 23% developed severe cases of tardive dyskinesia within 3 years.[44] According to these estimates, the majority of patients will eventually develop the disorder if they remain on the drugs long enough.[45]
Elderly patients are more prone to develop tardive dyskinesia, and elderly women are more at-risk than elderly men. The risk is much lower for younger men and women, and also more equal across the sexes.[46] Patients who have undergone electro-convulsive therapy or have a history of diabetes or alcohol abuse also have a higher risk of developing tardive dyskinesia.[40]
Several studies have recently been conducted comparing the prevalence rate of tardive dyskinesia with second generation, or more modern, antipsychotic drugs to that of first generation drugs. The newer antipsychotics appear to have a substantially reduced potential for causing tardive dyskinesia. However, some studies express concern that the prevalence rate has decreased far less than expected, cautioning against the overestimation of the safety of modern antipsychotics.[41][47]
A physician can evaluate and diagnose a patient with tardive dyskinesia by conducting a systematic examination. The physician should ask the patient to relax, and look for symptoms like facial grimacing, eye or lip movements, tics, respiratory irregularities, and tongue movements. In some cases, patients experience nutritional problems, so a physician can also look for a gain or loss in weight.[40]
Tardive dyskinesia can be socially disabling, perhaps in addition to the underlying psychiatric disorder, and may cause inflicted patients to isolate themselves. It also tremendously increase the risk of dysmorphophobia and sometimes, that can lead the patient to commit suicide. Stressful events can also trigger the onset of dyskinetic movements, whereas relaxation and sedation reduce the severity of symptoms in patients.[48]
Notes
- ^ For example: chlorpromazine (Thorazine), haloperidol (Haldol), olanzapine (Zyprexa), prochlorperazine (Compazine), paliperidone (Invega), risperidone (Risperdal)
- ^ For example: metoclopramide (Maxolon, Metozolv, Pramin, Primperan, Reclomide, Reglan)
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