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    The exact causes of TD are not yet well established (Leckman

    2002). No clear single neurotransmitter system has so far been

    clearly identified (Rickards 2009). However, dopamine release was

    greater in patients with TD than in controls. Abnormal motor co-

    ordination caused by the phasic dysfunction of dopamine trans-

    mission may produce tics (Singer et al. 2002; Nikolaus et al. 2009).

    Currently, the only medications formally approved for use in TD

    are haloperidol and pimozide (Thompson 2007). However, sig-

    nificant side effects, including extrapyramidal symptoms (EPS)such as acute dystonic reactions, Parkinsonism, akathisia, and

    tardive dyskinesia (Shapiro et al. 1973), have limited their long-

    term efficacy and safety prompted the development of the novel

    atypical neuroleptics.

    Aripiprazole is an atypical antipsychotic drug that is proposed to

    have a unique mechanism of action (Bowles and Levin 2003;

    Shapiro et al. 2003). The U.S. Food and Drug Administration

    (FDA) approved indications for aripiprazole in adolescents ages

    1317 with schizophrenia and bipolar disorder. There are only

    limited data on the effects or side effects of aripiprazole in children

    and adolescents with TD.

    Few studies have investigated the effect of aripiprazole in chil-

    dren and adolescents with TD, and the sample sizes of these studies

    were all very small. A 12-week, open-label trial with a flexibledosing strategy of aripiprazole was performed with 15 children and

    adolescents with TD or chronic tic disorders aged 719 years. This

    study demonstrated that a relatively low dose of aripiprazole could

    be used to control tic symptoms effectively in children and ado-

    lescents with TD and chronic tic disorders without causing sig-

    nificant weight gain (Seo et al. 2008). Another retrospective,

    observational study suggested that aripiprazole could improve the

    explosive outbursts symptoms of children and adolescents with TD

    and aripiprazole was tolerated reasonably well (Budman et al.

    2008). But a case reported an acute dystonic episode in a patient

    with TD treated with the partial dopamine agonist aripiprazole

    (Fountoulakis et al.2006).The preliminary evidence suggested that

    aripiprazoles benefit-versus-risk profile merits should be further

    explored for use in TD. Our hypotheses were that aripiprazolemight be effective in treating tic symptoms without causing serious

    side effects and aripiprazole could be as an interesting option for

    TD cases that did not respond to conventional therapies.

    The aim of the study was to explore the use and tolerability of

    aripiprazole as a treatment for tics and co-morbid symptoms in

    youths with TD. This was a first study of aripiprazole on TD in

    China.

    Methods

    Subjects

    The subjects were recruited from outpatient units in three hospi-

    tals in China over a period of 7 months from November, 2008, to

    July, 2009. All subjects were Chinese and of Han nationality. Thestudy protocol was approved by Institutional Review Boards (IRBs)

    in three sites. Written informed consent and assent were obtained.

    All subjects were required to meet the following inclusion cri-

    teria: (1) Between the ages of 6 and 18 years; (2) Diagnostic and

    Statistical Manual of Mental Disorders, 4th edition (DSM-IV)

    (American Psychiatric Association 1994) diagnosis of TD; (3)

    minimum body weight of greater than or equal to 25 kg; (4) out-

    patient status and not believed to require inpatient hospitalization

    during the course of the study; (5) minimum Clinical Global

    ImpressionsSeverity (CGI-S) score of moderately ill or greater

    severity (rating of 4); (6) normal screening medical history and

    physical examination; and (7) patient and parent/guardian must

    provide written informed consent (or assent).

    Subjects were excluded from participation in the study if they

    had one or more of the following exclusion criteria: (1) Intelligence

    quotient (IQ) score below 70 by Wechsler Intelligence Scale for

    Children, 3rd

    edition (WISC-III) (potential participants with a low

    IQ were excluded from this study because they were not expected

    to be able to describe their symptoms or the side effects of the

    medication appropriately); (2) prior adequate treatment witharipiprazole; (3) hypersensitivity to aripiprazole; (4) need for

    co-morbid psychotropic medication during the study period or

    required concurrent medication that effects tics; (5) current use of

    psychostimulants, mood stabilizers, or anticonvulsants; (6) pres-

    ence of significant co-morbid medical illness; (7) history of seizure

    disorder; (8) history of substance or alcohol abuse or dependence

    within 6 months of screening; (9) pregnancy, lactation, or positive

    pregnancy test; (10) absence of acceptable contraceptive method

    for sexually active females; (11) detection of pregnancy during

    the study, which would have led to withdrawal from the study; and

    (12) concurrent behavioral treatment for tic symptoms during the

    6-week treatment period.

    Study design and measurements

    This study was an 8-week, open-label flexible dose design in

    outpatients with TD receiving monotherapy with aripiprazole. All

    subjects had a 7- to 14-day screening period.

    The tics and co-morbid symptoms of each participant at baseline

    were evaluated by appointed psychiatrists Severity of tic symptoms

    during the previous week was evaluated using the Yale Global Tic

    Severity Scale (YGTSS) (Leckman et al. 1989). The YGTSS is a

    semistructured interview designed to elicit information concerning

    the specific character and anatomical distribution of tics. It has

    robust psychometric properties as a measure of change in tic se-

    verity and has been used in a number of studies internationally

    (Storch et al. 2005; Storch et al. 2007). The interview began with

    systemic assessment of current tic symptoms (both motor andphonic tic symptoms) that the clinician rated as present or absent

    over the past week. This was followed by assessing the most severe

    tic symptoms by the patients themselves. Motor and phonic tic

    symptoms were rated according to number, frequency, intensity,

    complexity, and interference on a 6-point ordinal scale. Patients

    Current Total Tic score and Total Most Severe Tic score ranged

    from mild to severe (0 absent, 15 for severity). The YGTSS was

    evaluated at baseline, weeks 2 and 4, and end point through face-to-

    face interviews with each participant.

    Tic severity was also assessed using the Clinical Global

    ImpressionsTics (CGITics) (Zhang 1998). The CGI consists of

    07 points. It is used to evaluate the severity of clinical symptoms

    and measure change in them over the course of the study. It has

    robust psychometric properties as a measure of change in clinicalsymptoms and has been used in a number of studies internationally

    (Zhang 1998). Operational definition of CGITics severity was as

    follows: (1) Normal or no tics at all; (2) borderline, tics may or may

    not be present; (3) mild, observable motor and/or vocal tics that

    may or may not be noticed, would not call attention to the indi-

    vidual, and are associated with no distress or impairment; (4)

    moderate, observable motor and/or vocal tics that would always be

    noticed, would call attention to the individual, and may be asso-

    ciated with some distress or impairment; (5) marked, exaggerated

    motor and/or vocal tics that are disruptive, would always call

    attention to the individual, and are always associated with signifi-

    292 CUI ET AL.

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    cant distress or impairment; and (6) severe, extremely exaggerated

    motor and/or vocal tics that are disruptive, would always call at-

    tention to the individual, and are associated with injury or inability

    to carry out daily functions. The scale was evaluated at baseline,

    weeks 2 and 4, and end point through face-to-face interviews with

    each participant.

    Staff for conducting clinician ratings all received extensive

    training by the responsible author in the primary outcome mea-

    sures, and satisfactory interrater reliability was documented. In-terrater reliability of YGTSS and CGITics in this study was

    assessed with the Pearson correlation test. Interrater reliability of

    YGTSS in this study was 0.87 and that of CGITics was 0.89. To

    maximize interrater reliability between sites, thenumberof raters at

    each site was minimized; they were all provided with identical

    instructions for administering YGTSS and CGITics, and efforts

    were to be made to ensure that the same rater administered the

    scales for a given patient. Those raters who failed to achieve the

    requisite level of interrater reliability were not allowed to rate

    subjects in the trial.

    The co-morbid symptoms of each participant were evaluated

    with the Child Behavior Checklist (CBCL). The CBCL is a widely

    used parent-reported questionnaire designed to assess the behav-

    ioral problems and social competence of children 418 years ofage, which was revised by Achenbach and was used after being

    translated into Chinese (Su et al. 1998). The CBCLChinese

    (CBCL-C) consists of 20 items that assess social competence and

    118 items concerning behavioral and emotional problems. The

    questionnaires were scored using eight measures: Withdrawal,

    somatic complaints, anxiety and depression, social problems,

    cognitive problems, attention problems, delinquent behavior, and

    aggressive behavior. They were grouped into two broad band

    scores: Internalization behavior problem score, consisting of

    withdrawal, somatic complaints, anxiety and depression, and ex-

    ternalization behavior problem score, consisting of delinquent and

    aggressive behaviors. Standardized T scores with a mean of 50

    (standard deviation [SD] 10) were provided for each subscale.

    A T score greater than 60 indicated a borderline clinical range.The higher the score, the more severe the childs behavioral and

    psychological problems (Yang et al. 2000). The scale was evalu-

    ated at baseline and end point.

    All subjects had a complete review of their current health status,

    which included a careful medical history. Vital signs, including

    blood pressure and pulse rate, were assessed at screening, baseline,

    weeks 2 and 4, and end point. Meanwhile, laboratory tests were

    conducted and included routine hematology, prolactin, clinical

    chemistry, and routine urinalysis. In addition, an ECG was done to

    rule out any preexisting cardiac conditions. The side effects of

    aripiprazole were evaluated using an adverse events chart made

    by this study team. The chart was developed to evaluate extra-

    pyramidal symptoms, gastrointestinal symptoms, neuromuscular

    symptoms, sedation, or other cognitive symptoms. Height, weight,and body mass index (BMI) of each participant were checked at

    baseline and end point, and the BMI of each participant was

    compared between the two phases.

    Dosing schedule

    Aripiprazole was initiated at doses of 1.252.5 mg daily in

    prepubertal children and at 2.55 mg in adolescents, and flexibly

    titrated every 57 days as tolerated and clinically indicated.

    Treatment duration was 8 weeks (with dosing generally titrated to

    therapeutic range within about 4 weeks).

    Data analyses

    Analysis of variance (ANOVA) was performed to evaluate the

    quantitative change in the scores pertaining to motor tic, phonic

    tic, total tic, global impairment, and global severity in the YGTSS

    at baseline, weeks 2 and 4, and end point. The same statistical

    method was also used for CGITics. Change in the CBCL was

    analyzed using a pairedt-test. Adverse effects were evaluated by

    descriptive statistics. In addition, weight and prolactin were ex-

    amined as primary side effects and were compared from baseline

    to week 8, using paired t-tests and a one-sample t-test based on

    percent change from baseline values. The last observation carried

    forward (LOCF) was used as the end point for a participant. All

    statistical analyses were performed using the SPSS statistical

    package, version 15.0. All statistical tests were two-sided at the

    5% level of significance.

    Results

    A total of 72 subjects were enrolled (age range 618;

    10.23 2.47 years; 55 males, 17 females). A total of 25 participants

    were drug nave to their tic symptoms, whereas 47 had a history of

    using neuroleptics; 31 took lowdoses of neuroleptics (e.g.,less than

    200 mg/day of tiapride or 1 mg/day of haloperidol or 1.5 mg/dayof risperidone); 16 took moderate-to-high doses of neuroleptics

    (200400mg/day of tiapride or 14.5 mg/day of haloperidol or

    1.53.5 mg/day of risperidone) (Table 1). Seven of 72 subjects

    (9.7%) discontinued aripiprazole before 8 weeks. Of those 7 sub-

    jects, 5 were adolescents and 2 were prepubertal children. Four of

    the 7 dropouts discontinued at the end of 4 weeks because of no

    significant reduction of symptoms. Two dropouts withdrew from

    the study at the end of 4 weeks because of continuous sedation, and

    another participant dropped out because of skin hypersensitivity at

    the end of 2 weeks, a symptom that disappeared 2 days after

    stopping the drug. In the cases of early withdrawal, data were ob-

    tained using the LOCF method. All 72 subjects provided data over

    2 weeks of the study, and these were used for analyses. There were

    no differences in outcomes stratified by site.The initial dosage of aripiprazole was 1.252.5 mg daily in

    prepubertal children and at 2.55 mg in adolescents, and flexibly

    titrated every 57 days as tolerated and clinically indicated. The

    mean daily dosages of aripiprazole were 4.880.63 mg,

    7.33 2.06 mg during weeks 2 and 4, and the final dose of ar-

    ipiprazole was 8.17 2.41 mg or 0.19 mg/kg (range from 0.1 to

    0.60 mg/kg).

    Table 1. Demographics and Prior History of Treatment

    n (%)

    Total of subjects 72 (100%)Males 55 (76.4%)Females 17 (23.6%)Mean age (SD) 10.23 (2.47)

    Never used medications 25 (34.7%)Ever used medications 47 (65.3%)

    Tiapride (

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    et al. 2009; Seo et al. 2008; Kawohl et al. 2009; Murphy et al.

    2009). Outcomes in all six studies were measured by the YGTSS

    at baseline and end point. In all the six studies, significant re-ductions in the YGTSS were noted in participants aged 719 years

    with doses ranging between 2.520 mg/day. In three of the six

    studies, significant improvement was shown from CGI scales at

    end point. In addition to these open-label studies there was a pilot

    study (Yoo et al. 2006), three case series (Murphy et al. 2005;

    Davies et al. 2006; Duane 2006), and one retrospective study

    (Budman et al., 2008), all finding clinical improvement with

    reasonable tolerability with use of aripiprazole in the treatment of

    tic disorders.

    A small dose of aripiprazole was found to be effective in con-

    trolling tic symptoms in the above-mentioned studies investigating

    tic disorders. However, the sample size of these studies was rela-

    tively small, even including some case reports. Aripiprazole is

    relatively new, even in the adult population, and without the ex-perience of time and the relative lack of excellent efficacy and

    safety data, there is not enough evidence to support its use in tic

    disorders. To the best of our knowledge, there have been not any

    data regarding the administration of aripiprazole to patients with tic

    disorders in China. So our study was a first study investigating the

    use of aripriprazole to treat children and adolescents with TD in

    China.

    In our open-label, acute treatment trial of children and adoles-

    cents with moderate-to-severe TD, aripiprazole administration was

    associated with noticeable improvement on dimensional measures

    across a variety of symptomatic areas, including reduced total tic

    frequency, intensity, interference, impairment, and severity and

    decreased behavior problems.

    The magnitude and significance of effect of aripiprazole onmeasures of tic severity was in line with an array of other similar

    reports. Aripiprazole was associated with a statistically significant

    decrease in the YGTSS Total Tic score of 50.3%. Yoo et al. (2007)

    reported that there was a 52.8% reduction in the mean YGTSS

    Total Tic scores after a mean of 9.8 4.8mg/day of aripiprazolefor

    8 weeks. Seo et al. (2008) reported that the degree of symptom

    reduction according to YGTSS was 5064.8% with a mean end

    point dosage of 8.174.06 mg. Another 12-week case series of 6

    children and adolescents with TD and OCD, mean decrease of

    YGTSS was 56% with a mean dose of 11.7 mg of aripiprazole

    (Murphy et al. 2005). It seems thatthere was a greater magnitude of

    effect of aripiprazole than for most other medications used in

    treating tics in childhood, such as those reported for olanzapine

    (30%; McCracken et al. 2008), ziprasidone (35%; Sallee et al.2000), risperidone (2142%; Gaffney et al. 2002; Scahill et al.

    2003; Gilbert et al. 2004), and pimozide (21%; Gilbert et al. 2004).

    The difference was notable, but it needs further exploration. Taken

    together with the significant drop in YGTSS Impairment ratings,

    the data (56.5%) from this study suggest that the overall clinical

    benefit for tic control per se is meaningful. The mean CGITics

    severity score was 4.77 1.69 at baseline and decreased to

    2.20 1.39 at end point (t 10.698, p0.000). The significant

    improvement observed according to CGITics severity also con-

    firmed this finding.

    An important aim of this study was to evaluate the possible

    broader effectiveness of aripiprazole on commonly co-occurring

    behavior symptoms in TD. A significant reduction of behavior

    symptoms was noticed according to the CBCL and its subscalesbetween baseline and end point in this study. This finding ex-

    panded on the observations (Stigler et al. 2004; Valicenti-

    McDermott et al. 2006; Owen et al. 2008a; Owen et al. 2008b;

    Stigler et al. 2009; Bastiaens et al. 2009) that rating of behavioral

    problems decreased with aripiprazole treatment. Given that

    behavior problems in TD often form the primary source of

    impairment and stress, we believe aripiprazoles beneficial

    effects are clinically important. The effectiveness of aripiprazole

    on behavior symptoms in TD may have contributed to the

    improvement of impairment.

    With regard to dosing aripiprazole in TD and tic disorders,

    there are no clear guidelines (Greenaway et al.2009). In ourstudy,

    the initial dosage of aripiprazole was 1.252.5 mg daily in pre-

    pubertal children and at 2.55 mg in adolescents, and flexiblytitrated every 57 days as tolerated and clinically indicated. The

    final mean daily dose of aripiprazole was 8.17 mg (range 2.5

    17.5 mg). This dosage was consistent with the available reports

    (from 6.7 to 14.5 mg/day)(Murphy et al. 2005; Davies et al. 2006;

    Yoo et al. 2006; Miranda et al. 2007; Yoo et al. 2007; Seo et al.

    2008; Budmanet al. 2008;Findling et al. 2008b). A dose of 10 mg/

    day appears to be a reasonable target dose for these conditions for

    many children and must adolescents. Given that younger children

    are more susceptible to the side effects of aripiprazole, they

    should be started at lower initial doses with a lower target dose

    (Greenaway et al. 2009).

    Table 3. Comparison of the Mean Scores of CBCL(T-Scores) Between Baseline and End Point (n 72)

    CBCL scoresBaseline

    (mean SD)End point

    (mean SD) T-testp

    value

    Total 56.36 8.54 49.46 8.39 4.93 0.000Externalizing 52.14 6.33 48.38 7.92 2.81 0.007Internalizing 56.28 8.44 52.14 9.48 3.07 0.003

    Withdrawn 57.40 8.07 56.16 8.14 1.81 0.075Somatic complaints 54.66 7.76 53.94 7.60 2.14 0.037Anxious/ Depressed 57.978.06 54.82 9.29 3.13 0.003Social problems 54.187.63 52.88 9.68 0.92 0.363Thought problems 56.318.35 52.16 9.22 3.24 0.002Attention problems 57.829.11 55.08 8.65 2.26 0.027Delinquent behavior 52.9110.97 51.74 8.72 1.04 0.301Aggressive behavior 55.0910.15 51.88 7.43 2.06 0.043

    Abbreviations: CBCLChild Behavior Checklist; SD standarddeviation.

    Table 4. Safety Report Comparison BetweenInitial and Final Visit (n 72)

    Inspection

    item

    Initial value

    (mean SD)

    Final value

    (mean SD) T-test p

    value

    ALB 44.36 11.10 41.53 11.74 2.04 0.046ALT 20.38 8.13 24.72 10.38 3.48 0.001AST 21.92 10.02 24.26 9.68 2.48 0.016Cre 57.61 28.03 53.97 29.49 2.08 0.041Bun 3.64 1.58 3.68 1.77 0.51 0.610PRL 11.49 4.00 11.25 4.69 0.70 0 .484BMI 20.71 9.80 21.57 8.11 0.94 0.352QTc interval 401.78 16.85 399.75 12.41 0.87 0.387

    Abbreviations: SDStandard deviation; ALB albumin(g/L);ALT alanine aminotransferase (U/L); AST aspartate aminotransferase(U/L); CreCreatinine(mmol/L); Bun blood urea nitrogen(mmol/L);PRL prolactin(ng/ml); BMI body mass index.

    ARIPIPRAZOLE IN TOURETTES DISORDER 295

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    In this acute trial, aripiprazole was reasonably tolerated, as 65

    of 72 (90.3%) of subjects were able to complete the protocol, and

    adverse events were generally mild to moderate in severity.

    Aripiprazole is associated with a relatively low risk of weight

    gain (Murphy et al. 2005; Haupt 2006; Correll et al. 2009;

    Reynolds et al. 2009). However, it resulted in rapid and robust

    weight gain in an animal model (Kalinichev et al. 2005). An

    open-label aripiprazole study in the treatment of youth with tic

    disorders (Murphy et al. 2009) also reported that although ar-ipiprazole was well tolerated increases in weight were found.

    Even though there was no significant weight gain in this study, it

    is not conclusive. A relatively small dose of aripiprazole was

    administered, and some of the participants complained of nausea

    in the beginning of this study. These two factors may have af-

    fected the weight changes of the participants. An additional long-

    term study investigating the weight change associated with

    aripiprazole will be needed to confirm the effect of aripiprazole

    on weight. Furthermore, the other side effects such as nausea and

    sedation were transient, and not as serious as those observed in

    other trials of aripiprazole (Findling et al. 2003; Yoo et al. 2007;

    Seo et al. 2008; Robert et al. 2009). Nausea remitted in 2 weeks,

    and sedation remitted after changing aripiprazole from daytime to

    nighttime administration. Although none of the trials specificallyassessed changes in sleep parameters or use of concurrent hyp-

    notic medications, it may be logical to administer this medication

    at bedtime to take advantage of its sedating effects (Greenaway

    et al. 2009).

    There have been a few case reports describing EPS, including

    one report of Parkinsonism (Lua et al. 2009) and another of acute

    dystonia (Singh et al. 2007). However Osorio et al. (2009) re-

    ported three cases of psychiatric geriatric patients who suffered

    from tardive dyskinesia that were resolved after switching treat-

    ment from haloperidol to aripiprazole. The EPS symptoms during

    this study were negligible, which may be due to a relatively small

    dose and a relatively slow titration of aripiprazole. Because a

    number of patients taking aripiprazole developed EPS, there is

    recommendation that patients be informed of the possibility of,and assessed routinely for these adverse effects (Greenaway et al.

    2009).

    Aripiprazole has no warnings pertaining to cardiac functioning

    (Bristol-Myers Squibb Canada 2009) and may even decrease QTc

    intervals (Goodnick et al. 2002). No statistically significant chan-

    ges in ECG readings were found in this study. However, further

    research using a larger sample size and longer treatment period is

    clearly needed to draw firm conclusions. There were no clinically

    significant laboratory abnormalities noted during aripiprazole ex-

    posure, including for prolactin; therefore, aripiprazole could be

    used when individuals are particularly susceptible to hyperpro-

    lactinemia induced by other agents. Finally, the impact of ar-

    ipiprazole treatment on metabolic parameters such as weight,

    fasting glucose, and lipids does appear to be less than some of theother available atypical agents when used in children and adoles-

    cents (Greenaway et al. 2009).

    Although a small dose of aripiprazole was found to be effective

    in controlling tic symptoms and behavior symptoms, several lim-

    itations of this study must be taken into account. First, this study

    was an open-label trial, not placebo or another active drug con-

    trolled, and both the participants and their parents were not blinded.

    Second, the sample size was relatively small. Third, the co-morbid

    conditions were not considered enough to profile diagnostically.

    Fourth, the lack of statistical correction for multiple hypothesis

    testing was another limitation. Allof these limitations mean that the

    findings of this study cannot be easily generalized to all the children

    and adolescents with TD.

    Conclusions

    In conclusion, this short-term study suggests that aripiprazole

    shows effectiveness in treating tic symptoms without causing sig-

    nificant weight gain or other serious side effects. Aripiprazole could

    be an possible option for TD cases that do not respond to con-

    ventional therapies. Further controlled, double-blind studies need

    to be conducted with a larger sample size to evaluate the safety and

    efficacy of aripiprazole in treating TD.

    Disclosures

    The studys authors do not promote for any pharmaceutical

    companies, and there are no other conflicts of interest.

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    Address correspondence to:

    Yi Zheng, M.D.

    Yun-ping Yang, M.D.

    Beijing Anding Hospital

    Capital Medical University

    XiCheng District

    Beijing, China, 100088

    E-mail:[email protected]

    298 CUI ET AL.