3 rd Annual AAAP Symposium September 13, 2014 Jan Harold D. Sia, M.D. Developmental-Behavioral...
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Transcript of 3 rd Annual AAAP Symposium September 13, 2014 Jan Harold D. Sia, M.D. Developmental-Behavioral...
ASD – ADHD COMORBIDITY:
WHAT IS THE EVIDENCE?
3rd Annual AAAP Symposium
September 13, 2014
Jan Harold D. Sia, M.D.Developmental-Behavioral Pediatrics
Adoption & Foster Care
www.developmentalpediatricsmanila.weebly.comHospital Affiliations: Makati Medical Center, Manila Doctors Hospital
Outline DSM-IV-TR and DSM-5 Prevalence of symptoms Etiological evidence Symptom expression
Neuropsychological/cognitiveBehavioral
Impact of comorbid ASD & ADHD Efficacy of ADHD treatments in ASD Clinical pathway for evaluation and
treatment
Impairing attention deficits are not improved by standard ASD treatments (Deprey & Ozonoff, 2009)
ADHD symptoms can often be effectively improved with ADHD treatments, including pharmacological treatments (Handen, Johnson, Lubetsky 2000)
DSM-5
ASD & ADHD comorbid diagnoses allowed
Prevalence of symptoms
High rate of ADHD symptoms in individuals with ASD20 – 70% based on recent estimates
Prevalence of symptoms
Frazier, et al. 2001.Rate of ADHD did not differ significantly in
PDD and non-PDD children (83% vs 75%)Rate of PDD did not differ significantly in
ADHD and non-ADHD children (5% vs 3%)
Prevalence of symptoms
Carlsson, et al. 2013.33% had severe hyperactivity/ADHD
Prevalence of symptoms Yoshida & Uchiyama. 2004.
67.9% (36) met DSM-IV ADHD criteria○ 20 – predominantly inattentive ○ 12 – combined type○ 4 – predominantly hyperactive-impulsive
ADHD by PDD subtype○ Autistic Disorder – 57.6%○ Asperger’s Disorder/PDD NOS – 85%
ADHD by age○ < 10 years – 78.8%○ ≥ 11 years – 50%
Prevalence of symptoms
Sinzig, et al. 2009.53% had sufficient ADHD-symptoms to
warrant diagnosis based on DSM-IV○ 46% - inattentive type○ 32% - combined type○ 22% - hyperactive/impulsive type
ASD+: lower mean age (10.2y vs 13.3y), lower IQ, took medications more often
Prevalence of symptoms
Ryden & Bejerot. 2008.37% - comorbid ADHD
○ 82% - inattentive subtype
Prevalence of symptoms - summary ADHD symptoms exist among individuals
with ASD, from preschool to adulthood ADHD-Inattentive subtype is the most
common presentation Limitation – use of parental reports, self-
reports Need for evidence from theoretical
domains and from neurobiological and neuropsychological studies
Etiological evidence ADHD symptoms are similar whether
occurring alone or comorbid with ASD (Sinzig. 2009)
Genetic studiesHigh rate of ASD and ADHD in persons with
22q11 deletion syndrome (Niklasson, et al. 2009)
Children with ADHD and their siblings have higher levels of ASD symptoms compared to typically developing children (Reiersen, et al 2007)
Symptom expression
Both ASD & ADHD are commonly associated with deficits in executive control and difficulty navigating social contexts (Bühler, et al. 2011)
Both are more common in males, have a strong comorbidity with intellectual disability, and are also associated with other specific learning and developmental difficulties (language, reading, and motor problems). (Leitner. 2014)
Symptom expression
Nature of attention problems in ASD may by qualitatively different from attention problems in ADHD (Deprey & Ozonoff 2009)ASD – hypervigilant attention & internal
distractibilityADHD – lack of focus & distractibility by
external stimuli
Symptom expression
Saulnier & Ventola. 2012In ASD, “inattention” to external stimuli may
be due to hyper-focused attention on an object or topic of interest
“Impulsive” behavior may be due to lack of understanding of the social inappropriateness of the behavior
Symptom expression
Similar high rates of delinquent, aggressive, and other externalizing behaviors for persons with ADHD combined type or ADHD combined type and PDD, but not for children with PDD only (Matsushima, et al. 2008)
Symptom expression – Executive function ADHD – display difficulties on tasks
measuring inhibition and sustained attention, while remaining relatively unaffected on tasks measuring planning or cognitive flexibility.
ASD – appear to display preservation of conscious inhibitory function, but with quite severe problems in planning and shifting attention.
Symptom expression
Additive effect?More impairment in daily functioning in
ASD+ADHD vs when they occur alone (Goldstein & Schweback. 2004)
Less severe symptoms of ASD+ADHD = better social skills (Matson, et al. 2010)
Combined ASD & ADHD was associated with more severe ASD symptoms than persons with ASD only (Ames & White. 2011)
Symptom expression
Additive effect?Individuals with ASD+ADHD had greater
impairments in verbal and spatial working memory, response inhibition, and global executive functioning than children with ASD only or typically developing children (Yerys, et al. 2009)
Etiology for co-occurrence? Rommelse, et al. 2010
The two are independent disorders occurring together by association with a third independent factor
Alternatively, ASD & ADHD share a common underlying etiology, a common genetic basis○ Family and twin studies – about 50 – 72% of the
contributing genetic factors in both disorders show overlap.
○ These shared genetic and neurobiological underpinnings form an explanation why both disorders occur so frequently within the same patient and family.
Impact of comorbidity
There is preliminary evidence that when ADHD is comorbid with ASD, the risk for increased severity of psychosocial problems increases (Gadow et al. 2004; Yerys et al. 2009)
Co-occurring symptoms are associated with greater impairment than a single diagnosis.
Impact of comorbidity Children with ADHD and ASD experience more
difficulty in daily life as reported by parents and teacher (Rao & Landa. 2013)
These co-occurring conditions may be less responsive to standard treatments for either disorder.
Children with comorbid ASD & ADHD show lower cognitive functioning, more severe social impairment, and greater delays in adaptive functioning than children with ASD-only as reported by their parents
Impact of comorbidity
St. Pourçain, et al. 2011.Autistic symptoms were more stable than
ADHD behaviors, which showed more variability
Impact of comorbidity
St. Pourçain, et al. 2011.Trajectories for both traits were strongly, but
not reciprocally interlinked, such that the majority of children with a persistent hyperactive-inattentive symptomatology also showed persistent social-communication deficits, but not vice versa.
ADHD Treatments in ASD General conclusions from clinical trials:
IQ and gender are not a determinant of stimulant efficacy
Effect sizes for the ASD population are somewhat smaller than the non-ASD population
Fewer individuals in the studies are classified as ‘responders’ than in the non-ASD population (preschool to adolescents)
Side effects are more common in the ASD population.
ADHD Treatments in ASD
Aman. 2008.○ Stimulants – highly variable responses
(significant improvement through to more problematic behavior), but would still be a reasonable first choice for previously untreated children with PDD and uncomplicated ADHD
○ Noradrenergic reuptake inhibitor - atomoxetine
ADHD Treatments in ASD
Aman. 2008.Evidence for positive effects:
○ Atypical antipsychotics – risperidone, quetiapine, ziprasidone, aripiprazole
○ Alpha-2 adrenergic agonists – clonidine, guanfacine
Weak evidence for:○ Antidepressants – TCA, SSRI○ Anxiolytics – benzodiazepines○ Antiepileptic mood stabilizers – divalproex
sodium, carbamazepine, topiramate
ADHD Treatments in ASD
Psychopharmacological treatment of ADHD symptoms in individuals with autism should be carefully considered.
These individuals should not be treated identically to those with ADHD only (Gargaro. 2011).
ADHD Treatments in ASD
Psychosocial interventions ???No known psychosocial interventions that
target co-occurring ASD & ADHD (Davis & Kollins 2012)
ADHD Treatments in ASD
Psychosocial interventions ???Similarities across approaches to treat both
disorders (Davis & Kollins 2012)○ Use of conditioning procedures○ Behaviorally oriented parenting intervention
but different conceptualizationFor ADHD, “parent training” typically involves
manual, group based programs designed to teach parents strategies to manage the behaviors of their children (eg, reduce impulsive behavior, increase focus on tasks)
ADHD Treatments in ASD
Psychosocial interventions ???Similarities across approaches to treat both
disorders (Davis & Kollins 2012)○ Behaviorally oriented parenting intervention
but different conceptualizationFor ASD, “parent education” places more emphasis
on individualized treatments that provide parents with tools to promote child skills development (eg, improve social engagement, increase communication attempts).
The picture that is emerging on the comorbidity of ASD & ADHD is one of common neurodevelopmental pathways, overlapping symptoms, and co-occurring disorders (Lindblad, Gillberg, & Fernell, 2011; Samyn, Roeyers, & Bijttebier, 2011).
Mahajan R, et al. Pediatrics. 2012.
Pathway 1: Symptom Evaluation
Key pointsAccurate ASD diagnosis should be made
using existing ASD diagnostic guidelines (including language and cognitive testing)
Educational, speech & language, and behavioral supports should be optimized
ADHD-focused clinical interview if ADHD symptoms continue despite initial steps; supplemented by ADHD-focused questionnaires (Conners Scale, Vanderbilt)
Pathway 1: Symptom Evaluation
Key pointsNeed for information from school, home and
communitySystemic medical evaluation to rule out any
undiagnosed medical problem that may contribute to the ADHD symptoms
Optimize medical, mental health, and educational/behavioral interventions
Reevaluate to assess need for medication trialSimultaneous evaluation and treatment across
multiple steps
Pathway 2: Medication Choice
Key pointsMethylphenidate preparations are generally
the first choice○ Preferable to start with short-acting
formulation to gauge side effects
Pathway 2: Medication Choice
Key points2nd line medications
○ Amphetamine salts○ Atomoxetine○ Alpha-2 adrenergic agonists: Clonidine,
Guanfacine○ Atypical antipsychotics: Risperidone,
AripiprazoleMost evidence for efficacy in the context of irritability
and aggression
Clinical practice Involve the family in the decision-making
process to discuss:Evidence Target symptoms that may improve and when to
expect improvementPotential side effects or adverse eventsExplore beliefs and values about medication for
ADHD symptoms More than 1 clinic visit/appointment may be
necessary to discuss pros and cons of a given treatment plan
Clinical practice
Careful documentation and analysis of this potential overlap between ASD and ADHD should be a mandatory component in assessment. (Geurts, et al. 2008)
Five-year view There may be an increase in the research
base on the comorbid state Future research based on the framework
adopted by Biederman et al (1991)The comorbid disorders are the expression
of phenotypic variability of the same DSM-5 disorder
Each disorder is a separate DSM-5 disorderADHD and ASD possess common
vulnerabilities
Five-year view
Future research based on framework adopted by Biederman et al (1991) The comorbid ADHD and ASD state represents
a homogeneous subgroup with the ADHD (or ASD) population
One condition is a developmental precursor to the other condition
One disorder increases the risk for the second disorder
Five-year view
Other research topics Assessment strategiesTreatment with mixed amphetamine saltsTreatment using combined behavioral and
medication managementFocus on family level variables (eg,
parenting efficacy, parenting stress, parent mental health, etc.) as either independent or dependent variables.
Final thought….
This new attitude will not only allow for more efficient clinical management of these children, but will also clear the way for a more precise scientific understanding of the overlap of these two disorders. (Leitner. 2014)
Summary
A majority of children with ASD have significant symptoms of ADHD but not all children with ASD have these symptoms
Family and twin studies suggest a common genetic etiology for both disorders
ADHD and ASD are associated with executive dysfunction but in different domains
Summary
There is evidence for using MPH in treating ADHD in ASD
Dual diagnosis may be essential to implementation of effective treatments. (Holtmann, et al. 2007)
THANK YOU!
ReferencesMatson JL. Rieske RD, Williams LW. The relationship between autism spectrum disorders and attention-deficit/hyperactivity disorders: an overview. Res Dev Disabil. 2013;34.
Gargaro BA, Rinehart NJ, Bradshaw JL, Tonge BJ, Sheppard DM. Autism and ADHD: how far have we come in the comorbidity debate? Neuroscience and Biobehavioral Reviews. 2011; 35.
Sinzig J, Walter D, Doepfner M. Attention-deficit/hyperactivity disorder in chidlren with autism spectrum disorder: symptom or syndrome? Journal of Attention Disorders. 2009.
Leitner Y. The co-occurrence of autism and attention-deficit hyperactivity disorder in children – what do we know? Frontiers in Human Neuroscience. 2014; 8.
Davis NO & Kollins SH. Treatment of co-occurring attention-deficit/hyperactivity disorder and autism spectrum disorder. Neurotherapeutics. 2012; 9.
Antshel KM, Zhang-James Y, Faraone SV. The comorbidity of ADHD and autism spectrum disorder. Expert Rev. Neurother. 2013; 13(10).
Mahajan R, et al. Clinical practice pathways for evaluation and medication choice for attention-deficit/hyperactivity disorder symptoms in autism spectrum disorders. Pediatrics. 2012; 130(Supp 2).