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Assessment and treatment of ADHD in children and adolescentsIn Australia: an overview
Professor Alasdair VanceHead, Academic Child PsychiatryDepartment of PaediatricsUniversity of MelbourneRoyal Children’s Hospital
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Outline of Symposium
1. ADHD: definition, epidemiology2. ADHD: Key biological risk factors3. ADHD: Key psychosocial risk factors4. A model for intervention5. A medication approach (Australian perspective)
Prof. A. Vance
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1. ADHD: definition
Diagnostic nosology-some comments:
DSM-IV definition of a mental disorder-A mental disorder is conceptualized as
a clinically significantbehavioural pattern that occursin an individual and is associated with impairment inone or more areas of functioning Prof. A. Vance
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1. ADHD: definition
Diagnostic nosology-some comments
in children and adolescents-
impairment is developmentally inappropriate, judged relative to children of the same age, gender and IQin social, academic, occupational or other important areasof functioning
multi-informant reports requiredProf. A. Vance
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1. ADHD: definition
Attention Deficit Hyperactivity Disorder (ADHD)DSM-IV CRITERIA
-six or more symptoms, at least six months duration, maladaptive/inconsistent with developmental level-inattention dimension and/or hyperactivity-impulsivity dimension
-evident in at least two settings-onset before seven years of age-impairment in social, academic, occupational functioning-symptoms not due to a PDD, Psychotic, Mood, or Anxiety Disorder Prof. A. Vance
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1. ADHD: definition
TYPES of ADHD
-combined type-predominantly inattentive type-predominantly hyperactive-impulsive type
Prof. A. Vance
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1. ADHD: definition
Key comorbid conditions:
-tic disorders-oppositional defiant disorder/conduct disorder-anxiety and/or depressive disorders-language learning disorders (spelling/reading/arithmetic/writing)-speech and language disorders (articulation/grammar)-developmental coordination disorder
Prof. A. Vance
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1. ADHD: definition
Common possible developmental pathways: all associated witheducational, social, occupational under-achievement, alcohol/substance abuse/dependence disorders, altered adult personality
childhood adolescence adulthood
ADHD-CT ADHD-IA ADHD-IA
ADHD-CT Depressive d Depressive d
ADHD-CT Conduct d ASPDProf. A. Vance
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1. ADHD: epidemiology
- 2%-6.3% (epidemiological samples)
- 2-3: 1 (boys: girls)
- social adversity status (non-specific increase)
- ethnic, cultural factors (pattern same, prevalence differs)
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Psychosocial risk factors
Healthy ADHD ADHD
d = 1.0
d =0.5
Biological risk factors
2. ADHD: Key biological risk factors
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2. ADHD: Key biological risk factors
Genetics:
-heritability estimates 65%-90% phenotypic variance in populationStudies OR
-DAT1 10-repeat allele, N=14 1.13DRD4 7-repeat allele, N=13 1.45Taq1 polymorphism DBH, N=3 1.33SNAP-25 gene N=5 1.195HT1B N=3 1.44
Prof. A. Vance
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2. ADHD: Key biological risk factors
- Cognitive deficits in ADHD are associated with thesekey candidate genes:
Healthy children:
DAT1 3’ VNTR 10-repeat alleleDAT1 intron 8 VNTR 3-repeat allele R spatial inattentionDAT1 3’ UTR VNTR 10-repeat allele (η2 = .07/.08/.08)
- this 10/3DAT1 haplotype – ADHD (OR 2.58)
Prof. A. Vance
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2. ADHD: Key biological risk factors
Neuroimaging-structural MRI:prefrontal cortex, basal ganglia, medial temporal and inferior parietal lobes (global 3% decrease)
primarily white matter (d=.45 cf .28 gray matter)
developmental trajectories independent of medicationtreatment
Prof. A. Vance
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Total cerebral growth curves
Prof. A. Vance
900
1000
1100
5 7 9 11 13 15 17 19 21Age (y)
mL
NV Males
ADHD Males
NV Females
ADHD Females
Castellanos et al., JAMA 2002
Controls > ADHD
p<.003
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2. ADHD: Key biological risk factors
Neuroimaging-functional MRI:prefrontal cortex, basal ganglia, medial temporal and inferior parietal lobes
bilateral task dependent decrease in activation
post-puberty - midline activation - compensatory?pre-puberty - not evident
Prof. A. Vance
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Silk, Vance et al, B J Psych 2005 N=14, CBCL inattention subscale T score: 72.23 (10.72)
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Region of activation BA C (mm) ZControl Group greater than ADHD-CT GroupParieto-Occipital
R Precuneus 19 24 -70 32 3.53R Cuneus 19 32 -90 28 2.82
Posterior ParietalR Inf. Parietal 40 36 -40 50 2.82
Frontal/SubcorticalR Caudate Nucleus, Body 18 -12 22 2.82
Vance et al, Mol Psych 2007 N=24, CBCL inattention subscale T score: 72.14 (9.43)
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N=14, CBCL inattention subscale T score: 70.88 (9.75)
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2. ADHD: Key biological risk factors
Cognitive neuroscienceresponse inhibition tasks (eg STOP tasks)working memory tasks (eg n-back; VSWM tasks)
deficits in both implicating PFC-striatal andPFC-striatal-parietal neural networks
investigated as markers for medication responsein children with ADHD
Prof. A. Vance
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2. ADHD: Key biological risk factors
Cognitive neuroscience
working memory (Mehta et al., 2000)
PET VSWM task 10 healthy adult males 2 sessions 2W apartMPD 40mg or placebo with scanning 90+ minutes laterrCBF -left DLPFC, left SMA, left PPCassociated with improved VSWM performance
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2. ADHD: Key biological risk factors
Cognitive neuroscience
selective attention/working memory (Bush et al., 2008)
fMRI MSIT 21 adults ADHD RCT 6 weeks OROs-MPD or placebo daMCC associated with improved performance
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2.ADHD: Key biological risk factors
Composite z-scoresADHD children in thelow dose and high dose Condition (dex. 2.5mg/7.5mg) (Mollica et al.,Human Psychopharmacology 2004)
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Prof. A. Vance
2. ADHD: Key biological risk factorsSummary
- biological factors important- small effect: candidate genes- medium effect: candidate genes- CogNS measures; brain structural/functional changes
- large effect: CogNS constructs
- developmental stage-independent deficits- compensatory changes post-puberty
- medication changes non-specific currently
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3. ADHD: Key psychological risk factorsSummary- parental psychopathology: alcohol/depressive/anxiety disorders- marital functioning:- family functioning: - peer group functioning:
“empathy/attunement/sensitivity/responsiveness”
“flexibility/adaptiveness/regulation of affect/problem solving”
sociocultural context affects the character of these aspectsand their detection
Prof. A. Vance
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4. A model for intervention
-assessment and treatment focuses on delineation of risk factors andresilience factors-biologically (eg, executive function deficits; good arousal regulation) psychologically (eg, externalise blame; balanced critical self-reflection) and socially (eg, hostile critical interpersonal environment; confiding, nurturing consistent interpersonal environment)
-monitoring of these risk and resilience factors and their response totreatment through developmental phases
Prof. A. Vance
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4. A model for intervention-a practical approach
[A] psychological and social treatment approach implementedfor 4-6 weeks (may take 6 months of new habit formation beforesustained behavioural change)
key elements are the interpersonal and the intra-individual milieuinterpersonal: positive reinforcement, response cost, token economy, contingency planning (turn taking, active listening, active ignoring, empathy skills, etc), making and keeping friendsintra-individual: controlled breathing, muscle biofeedback,guided visual imagery Prof. A. Vance
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4. A model for intervention
- a practical approach
[B] key other vulnerabilities addressed – vision, hearing, specific verbal and/or visuospatial learning difficulties, developmental coordination difficulties, speech and language difficulties
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4. A model for intervention
a practical approach
[C] medication use to facilitate availability of the young person to learn from the psychological and social interventions through
better arousal regulation better mood regulationbetter executive functioning
Prof. A. Vance
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Prof. A. Vance
4. A model for intervention
Summary- medication can aid a child’s ability to invest ina psychosocial treatment program and learn from this program
- can take 6 months of practice before new habits are formed
- biological and psychosocial treatments maximize resilienceand minimize risk factors through shared effects on the brainand the mind
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5. A medication approach (Australian perspective)
- stimulant medication is the first line treatment
short-acting forms: methylphenidate, dexamphetamine long-acting forms: OROS-methylphenidate, LA-methylphenidate
clear and substantial evidence for methylphenidate efficacy up toa dose of 60mg daily for treatments periods of approximately 12 months
methylphenidate and dexamphetamine similar efficacy and adverse effects profile although individual preferences manifest
Prof. A. Vance
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5. A medication approach (Australian perspective)
- Stimulant medication benefits
decrease core symptoms of ADHDdecrease aggressionincrease quality of social interactionsincrease compliance
- Stimulant medication indications
ADHD diagnosis and psychosocial interventions insufficientProf. A. Vance
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5. A medication approach (Australian perspective)
- Stimulant medication adverse effects
initial insomnia,appetite suppression
nervousness, restlessness, dysphoria,easy crying, agitation, depressive symptoms, stomach acheheadache, dizziness, rash, motor tics, mannerisms
in overdose: delirium, sweating, tremor, twitching, vomiting Prof. A. Vance
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5. A medication approach (Australian perspective)
- Stimulant medication adverse effects
growth retardation (MTA 3y f/u: 2cm /2.7kg )weight loss
epileptic seizures not adverse effects but careful psychotic episodes monitoring neededabuse potential in vulnerable patients
Prof. A. Vance
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5. A medication approach (Australian perspective)
- Atomoxetine is the second line treatment
specific potent noradrenaline re-uptake inhibitor indicated when stimulant medication ineffective,associated with significant adverse effects
common adverse effects: nausea, drowsiness, initialinsomnia, appetite suppression
Prof. A. Vance
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5. A medication approach (Australian perspective)
- Imipramine is a third line treatmenttricyclic compound similar to atomoxetine (a phenylpropanolamine derivative) but with lessspecific noradrenaline effect and significant cardiac adverse effects
- Clonidine is a third line treatmentcentral α-2 noradrenergric agonistsignificant effect; primarily hyperactivity/impulsivenesssignificant drowsiness, hypotensive and cardiac adverse effectsgradual withdrawal because of rebound hypertension and tics
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5. A medication approach (Australian perspective)
- Neuroleptic medication is a third line treatmentatypical neuroleptic medication: eg risperidone / aripiprazolelow doses (up to risperidone 1.5mg daily equivalent)severe aggression, affective lability, PDD, ID
typical neuroleptic medication: eg pericyazine - thioridazine equivalent (now withdrawn)
third line treatments only used with careful monitoring and involvement in a treatment-resistant unit
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5. A medication approach (Australian perspective)Conclusion
- start low, go slow, finish slow, although ensure optimal dosesare used
- medication facilitates each child’s ability to learn in the classroom, playground and home environment: new habitscan take 6 months to evolve
- Comprehensively assess and treat with approved medicationand/or psychosocial treatments all comorbid conditions
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5. We need an adequate evidence base for medication treatment,psychosocial treatment and their combination….
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In the context of
careful
systematic
comprehensive
training…
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TRANSLATIONAL CLINICAL SCIENTISTS
From laboratory bench, social/cultural factors toclinical practice
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Tools for Translation: 2008
Genes Cells Systems Individual SocialWGASSequencingTransgenicsEpigeneticsDatabases
Stem CellsTranscriptprofilesProteomicsOpticalimagingDatabases
Electrode ArraysZebrafishPETfMRIDTIDatabases
SensorsEye gazeCognitivetools
Web 2.0Knowledgemanagement
Repositories – Data Sharing - Integration