aripripazol y tourette
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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-
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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.
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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.