Tardive Dyskinesia: Minimizing Risk and Improving Outcomes in Schizophrenia and Other Disorders
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DECISION MAKER FORUM IN MANAGED CARE DECEMBER 2007 FACULTY Leslie Citrome, MD, MPH Tardive Dyskinesia: Director, Clinical Research and Evaluation Facility Minimizing Risk and Nathan S. Kline Institute for Psychiatric Research Orangeburg, New York Improving Outcomes in Professor of Psychiatry New York University Schizophrenia and Robert Dufresne, PhD, PhD, BCPS, BCPP Other Disorders Professor of Pharmacy Leslie Citrome, MD, MPH; Robert Dufresne, PhD, PhD, BCPS, BCPP; University of Rhode Island College and Judy M. Dyrud of Pharmacy Kingston, Rhode Island THE USE OF ANTIPSYCHOTIC AGENTS FOR PSYCHIATRIC DISORDERS In the United States, antipsychotic drugs are the cornerstone of treatment for schizo- This supplement to The American phrenia,1 for which about 2 million patients are treated annually.2 In addition, antipsychot- Journal of Managed Care is sponsored ic agents are widely used in the treatment of schizoaffective disorders and mood disorders by Eli Lilly and Company. with psychotic features. They are also sometimes prescribed for diagnoses that do not include a psychotic component.3 According to the US Department of Health and Human DISCLOSURES Services, 11 million antipsychotic prescriptions were paid by Medicaid in 1998, 51% of The faculty report the following which were for atypical antipsychotics.4 commercial disclosures: Psychosis can have a devastating impact on economic prospects, socialization, and qual- Dr Citrome: ity of life. Unfortunately, long-term treatment with antipsychotics carries the risk of seri- Consultant: Avanir, Bristol-Myers ous adverse effects, including tardive dyskinesia, which can have a substantial negative life Squibb, Eli Lilly, GlaxoSmithKline, impact.5 Because for many patients antipsychotics are the only effective treatment, clinicians Janssen, Jazz, Pfizer, Vanda; who prescribe them must be educated about their risks and guard against serious long-term Grant/research support: AstraZeneca, effects. Adverse effect risk can vary with individual patient vulnerabilities, treatment dura- Barr, Bristol-Myers Squibb, tion, dosage, and drug class (conventional/first-generation antipsychotics [FGAs] or atypi- Eli Lilly, Janssen, Pfizer; cal/second-generation antipsychotics [SGAs]). In schizophrenia, treatment is commonly life- Honoraria: Abbott, AstraZeneca, long; therefore the best treatment uses the antipsychotic agent with the best long-term effi- 6 Avanir, Bristol-Myers Squibb, Eli cacy-to-risk ratio for the individual patient. Lilly, GlaxoSmithKline, Janssen, MOTORIC ADVERSE EFFECTS Jazz, Pfizer, Vanda; Acute motoric adverse effects can begin to appear within the first few hours of antipsychotic Speaker’s bureau: Abbott, treatment. All antipsychotics can cause potentially fatal neuroleptic malignant syndrome, char- AstraZeneca, Eli Lilly, Pfizer. acterized by diffuse muscular rigidity, tremors, fever, labile blood pressure, and cognitive and Dr Dufresne: autonomic disturbances.7 Extrapyramidal symptoms (EPS) may develop in 50% to 60% of Consultant: Bristol-Myers Squibb, patients treated with FGAs.8 Dystonias appear as disturbances of muscle tone, whereas dyski- 9 Eli Lilly, JNJ (Janssen); nesias are disturbances of movement. Honoraria: Bristol-Myers Squibb, Eli Lilly, JNJ; Speaker’s bureau: Acute dystonia, involuntary and sometimes painful muscle contractions in neck, face, 10 10 Bristol-Myers Squibb, Eli Lilly, JNJ. tongue, or back, can usually be relieved with anticholinergic agents. 10 PUBLISHING STAFF Akathisia (motor restlessness) frequently manifests as pacing or inability to sit still. Acute akathisia does not always respond to antiparkinsonian drugs.11,12 Drug-induced Contributing Editor akathisia can be mistaken for psychotic agitation, sometimes leading clinicians to increase William H. Doutré, PharmD the antipsychotic dose.13 However, akathisia is best treated by reducing the dose or switch- Managing Editor ing antipsychotics.10,12 Elizabeth Turrin Design Director Drug-induced parkinsonism (tremors, rigidity, shuffling gait, extremely slow movement Michael Molfetto or paralysis)10 can be alleviated with antiparkinsonian agents including anticholinergics.10 Involuntary orofacial movements that seemed associated with neuroleptic treatment were A Supplement to described as early as 1957 and, along with limb and trunk movements described later, were called tardive dyskinesia (TD) in 1964.13 As the name “tardive” implies, TD was considered to be a result of months or years of exposure to antipsychotic drugs.13 Early reports consis- tently emphasized its persistence long after discontinuation of neuroleptics.13 These criteria remain today. OL44132 TARDIVE DYSKINESIA: MINIMIZING RISK AND IMPROVING OUTCOMES IN SCHIZOPHRENIA AND OTHER DISORDERS Training in the assessment of TD abnormal gait.25 It may affect neck elderly. In the Hillside study 23% of has decreased since prescribing prac- muscles first and present as an a subgroup of patients older than 55 tices have come to favor SGAs.14 abnormal head position.9 Some years developed TD within 2.2 years.15 Because many clinicians lack training authors contend that tardive dysto- Another prospective study of elderly in movement disorders and many nia can be mistaken for TD, and that patients found incidence of 59.8% patients do not complain of dyskine- TD identified within a year of after 3 years with FGAs.15 sias, TD may be underdiagnosed.15 antipsychotic initiation is usually tar- Whereas acute dystonia, akathisia, dive dystonia.26 No treatment for and drug-induced parkinsonism may tardive dystonia has been proven The incidence of TD is be transient and reversible with treat- generally effective. Tetrabenazine, higher in the elderly. ment, TD can be persistent.16,17 anticholinergics, clozapine, clon- Persistence is usually defined as sus- azepam, or the combination of cloza- tained TD symptoms >3 months after pine plus clonazepam have been Incidence of TD is also higher in withdrawal of the offending neurolep- helpful in some cases.9,25-28 In 1 mood disorders, sometimes even higher tic,9,18 but in some studies it can mean recent case, antipsychotics were dis- than in schizophrenia.32,33 TD incidence >3 months whether or not antipsy- continued and schizophrenia and may increase in the future as the use of chotic treatment continues.19 In up to severe tardive dystonia were man- antipsychotics increases for affective 50% of affected patients, TD becomes aged successfully with mood stabiliz- disorders and other nonschizophrenic chronic and irreversible.20 ers and benzodiazepines alone.29 indications.15 Akathisia was also noted in several Incidence and prevalence studies of the first reports of TD.13 Unlike that include outpatients may not con- In up to 50% of affected acute akathisia, tardive akathisia can trol for nonadherence. Up to 50% of worsen when the antipsychotic dose is outpatients fail to adhere to medica- patients, TD becomes lowered and can present with emergent tion schedules.2,18 In the context of chronic and irreversible. TD.12 In a study of chronic schizophre- nonadherence, patients may be devel- nia, discontinuation of antipsychotics oping TD with less total exposure to resulted in akathisia and withdrawal antipsychotics than is reported. Some dyskinesias described in the TD in a third of patients.12 When Another way to look at TD is in risk 1960s-1970s first appeared after neu- antipsychotics were restarted, the pa- related to years of neuroleptic expo- roleptic cessation but disappeared sev- tients who had exhibited akathisia at sure. The risk of TD is approximately eral weeks later.10,13 These symptoms, withdrawal persisted in exhibiting TD 5% per year of FGA exposure up to called withdrawal dyskinesia, reflect for up to 6 weeks, suggesting a rela- about 40 years of age.34 After age 40 the action of neuroleptics to suppress tionship between TD and late-onset years, the risk increases.34 In elderly or mask dyskinesia.21,22 akathisia.12 Tardive akathisia may be a patients, the risk in the first year of When TD first appears during preliminary stage of TD in some FGA exposure may be as high as antipsychotic use, withdrawal may ini- patients receiving long-term antipsy- 25%.14 However, the risk per year of tially worsen involuntary move- chotic treatment.12 SGA exposure has not been firmly ments.21,23 Later (sometimes in 1-2 established. A recent systematic review months) TD can remit spontaneously. INCIDENCE AND of current literature suggests annual Thus, withdrawal of antipsychotics, PREVALENCE OF TD TD incidence of about 1% per year when possible, is a primary treatment In an analysis of studies totaling with SGAs versus 5% per year with for TD.23 Dyskinesia that first appears nearly 35000 patients treated with FGAs.35 on withdrawal may be masked again if antipsychotics, the mean corrected antipsychotics are restarted. Then it is prevalence of TD was 18.5%.30 The CHARACTERISTICS AND important to avoid both FGAs, with incidence of TD in young adults is 4% PATHOPHYSIOLOGY OF TD their higher associated incidence of to 5% annually, but the risk increases TD is characterized by movements TD, and concomitant anticholinergic with age and duration of neuroleptic that are involuntary, repetitive, and medications for acute drug-induced treatment.31 purposeless.8 The movements may be movement disorders, with their poten- In the Hillside study, the first long- of 3 possible types: chorea (variable, tial to exacerbate TD.20,23 term prospective study of TD inci- rapid, jerky or fidgety), athetoses Dystonia that persisted 20 months dence,15