psychiatry diagnosis of adhd:assessment · diagnosis of adhd: current perspectives ... xxx xxx xxx...
TRANSCRIPT
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Assessment &Assessment &Diagnosis of ADHD:Diagnosis of ADHD:
Current Perspectives on AuditoryProcessing and ADHD
Aug. 11, 2001Art Maerlender, Ph.D.
Dartmouth Medical SchoolClinical School Services and Learning
Disorders ProgramSection of Child and Adolescent
Psychiatry
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Etiological Factors
• Environmental factors associated with ADHD• lead poisoning (other toxins)
• Chromosomal anomalies associated with ADHD• Fragile X, XYY syndromes• Turner's syndrome (45 X0)
• Neurofibromatosis• Food additives -
• studies have not held up• Central nervous system infection• Low birth weight• Thyroid disorder
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Family History
• considerable support for genetics• often not noticed by family• FAS• Maternal consumption of alcohol;
heavy smoking
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Definition of ADHD
A persistent pattern of inattention orhyperactivity/impulsivity that is morefrequent and severe than is typicallyobserved in individuals at acomparable level of development;
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Some symptoms mustpresent before age 7;
• There is some evidence that this isnot necessarily valid
• Particularly for girls
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Some impairmentpresent in at least 2settings;
• Home• School• Work
• Testing situation (?)
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Clear evidence ofinterference withdevelopmentally
appropriate behaviors
• social,• academic or• occupational functioning;
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Exclusivity
• Does not occur exclusively duringcourse of PDD, psychotic disorderor better accounted for by anothermental disorder.
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3 Sub-types
• hyperactive-impulsive• inattentive• mixed
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Symptoms:Inattention/Disorganization
• MORE DIFFICLT TO IDENTIFY: GOODBEHAVIOR
• Often fails to finish things• Does not seem to listen• Easily distracted• Difficulty concentrating• Difficulty organizing work, projects• Needs a lot of supervision• Frequently shifts activities
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Symptoms:Motorhyperactivity/impulsivity
• FREQUENTLY DIAGNOSED DUE TOCONTROL/MANAGEMENT ISSUES
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H-I symptoms…
• Excessive running and climbing• Excessive fidgeting• Difficulty staying seated• Motor restlessness• Always on the go• Acts before thinking• Blurts out answers• Difficulty waiting turn
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Associatedproblems
• Academic underachievement(especially with inattentive type)
• Problematic peer relationships• Low self-esteem• Conduct problems• Negative interactions with
parents/teachers
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Behavioral VariabilityBehavioral Variability
• Not evident in all situations• Sustained attention• Structured situations
• first noticed in school transitions
• Primary problem:• INABILITY TO REGULATE BEHAVIOR
• new situations (including changes inreinforcement schedules)
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Physiological andCognitive
• Attention is both• A sensory response system• A cognitive operation on those
responses
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NeuropsychologicalBasis of ADHD
• much research to point to frontal andinterconnecting subcortical circuits
• models of attention also implicate frontal lobes• convergence of evidence points to frontal lobe
dysfunction
• neuroanatomy• neuroimaging• neurochemistry• stimulant meds
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ADHD Diagnosis reflectsmore than attention
• Physiogical arousal• Neurological attention• Cognitive executive function
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Arousal, Attention, andArousal, Attention, andExecutive FunctionsExecutive Functions
• DSM-IV diagnosis confounds theseconstructs
• Barkley argues that the dx.Reflects executive dysfunction
• NP studies have attempted todifferentiate specific functions• All 3 are involved
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Arousal
• Also called vigilance• Changes in brain that affect overall
state
• Readiness to respond to anyexternal or internal event
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Neuroanatomy Neuroanatomy ofofarousalarousal
Two systems regulatearousal levels:
• Thalamus• Brain-stem reticular
formation
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Attention•Modulation of informationprocessing within a particularsensory modality•Indication that changes in neuronalresponse (neural activity) reflecteffortfulness vs automatic processing
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Frontal & parietalFrontal & parietalinvolvementinvolvement
• Associative and polymodalcortices regulatemodulations of sensoryinput• Cortico-cortico interactions
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Right hemispheredominance
Ventrolateral prefrontal cortexand frontal eye fieldsinvolved in auditory andvisual-spatial attention
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Visual Domain
• Overlap between networks forvisual-spatial orienting• (right parietal cortex)
• and oculomotor control• (frontal eye fields)
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Auditory DomainAuditory Domain
• Attention modulation in primaryauditory cortex (most studies)
• Paus’ studies indicate ventrolateralprefrontal cortex, parietal cortex andsecondary auditory cortex (superiortemporal gyrus)• Not primary auditory• Possible confound with baseline task
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Auditory Attention
• similar processing as visual• location experiments: visual dominates
• visual pre-cues effected RT to localizeboth vis. & aud. targets
• auditory pre-cues effected only RT toauditory targets
• when vis. & aud. cues conflict, visualdominate
• Ward, 1994
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Executive Function:Barkley’s Model
• deficiencies in regulation & maintenanceof behavior by rules and consequences
• problems inhibiting, initiating, sustainingresponses to tasks
• problems adhering to rules orinstructions
• esp. when response contingencies areweak
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Four Processes• interactive• alter probability of occurrence of subsequent
behavioral responses• SELF-REGULATION• direct behavior toward future
1. separation of affect2. prolongation3. internalization4. reconstitution
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Components of theExecutive System
• Gioia & Isquith
• Awareness of one’s strengths/weaknesses• Set realistic goals for oneself• Plan and organize behavior to achieve goals• Initiate behavior in pursuit of goals• Inhibit behavior incompatible with goals• Monitor performance in relation to goals• Flexibly and strategically, shift behavior with
obstacles that interfere with goal pursuit
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Functional Domains ofThe Executive
• Initiate- begin task, activity, attention, language
• Sustain- persist for age appropriate time
• Inhibit- stop an action or not react to impulse
• Shift- move from one task or situation to another
• Plan- anticipate future events and develop steps
• Organize- establish, maintain order
• Self-monitor- attend to behavior/output; revise
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Frontal LobeFunctions
• orbito-frontal , limbic structures• mediates delayed responding & object
permanence• language:
• lengthened pathways lengthens responsetime, provides parallel systems
• internalized symbols expresses cognitiveinfo (not just social communication);allows hindsight & foresight
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MirskyMirsky’’ss Studies: Studies: Behavioral &Behavioral &PsychophysiologicalPsychophysiological Markers of Markers ofDisordered AttentionDisordered Attention(1987)(1987)
• Factor analysis of NP tests• 4 FACTORS FROM 10 NP TESTS
• different brain regions support differentfunctions
• shared responsibility: specialization isnot absolute
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The factors:1. Perceptual-motor speed: focus & execute
(Trails, letter cancel, digit symbol, Stroop)
2. Vigilance - sustaining focus (CPT errors &RT)
• Stabilize - variability of RT & commissionerrors
3. Numerical-mnemonic - encoding (Digit Span,Arithmetic)
4. Flexibility - shifting (WCST)
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Replication ofReplication of Mirsky Mirsky’’ssmodel of attention withmodel of attention withchildrenchildren
Mirsky’s model:! shift (dorsolateral prefrontal)! sustain midline thalamus, upper
brainstem, reticular)! focus-execute (superior parietal,
superior temporal, basal ganglia)! encode (hippocampus, amygdala)
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Kelly’s Extension ofthe Mirsky Model
somewhat different than Mirsky’s factors"although the Mirsky model also fit the
data well> included errors> demonstrated significant developmental
trends# shifting showed most growth# likely due to developmental changes in
prefrontal cortex
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Tests• WISC-III VIQ, PIQ• Symbol Search, Digit Span, Arithmetic, Coding• Number Cancellation
• hit rate, time• CPT (Vigil/w)
• hit rate, omissions, commissions, av. RT• WCST
• # correct, categories, #psv error• Stroop Test (Golden)
• time and errors• Trails A & B
• time and errors
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Kelly’s 4 Factor Model
Element of Attention Factor Identity
Speed of Response Information processing
Impulsivity Errors in Processing
Sustain Vigilance
ShiftFlexibility
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Speed of ResponseFactor: Information Processing! Tests:
• Cancellation time,• Coding score,• Trails total time,• Symbol Search score,• Arithmetic score,• CPT RT,• Stroop total score
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Stroop test
Appears to tap orbitofrontal• Also implies impulse inhibition
Read the words:Orange, purple, white
Say the colors:XXX XXX XXX
Say the colors:Purple, white, orange
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ImpulsivityImpulsivity
Factor: Errors in Processing" Tests:
$Symbol Search errors,$Cancellation errors
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Sustain
Factor: Vigilance#Tests:
o CPT Hit Rate,o CPT % Errors of Commission
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Shift
Factor: Flexibility$Tests:
%WCST % error%WCST Categories
• WCST taps dorsofrontal• Also relates to abstraction ability
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Summary
! 4 factor model appears to representattentional dysfunction in children
! likely neurological correlation withMirsky
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Do NP TestsIdentify ADHD?
Predictive Power ofNeuropsychological Tests forADHD in ChildrenPerugini et al, 2000
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The predictive power ofspecific test battery
• 21 ADHD boys ADHD Combinedor HI/I
• 22 normal controls• ages 6-12• IQ >80
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Tests Administered
• thought to assess frontal lobe integrity• consistent with theories of ADHD
implicating frontal lobes in ADHD• Hand movements (KABC)• Stroop• COWAT - FAS• Trail Making A & B• Arithemtic & Digit Span• CPT (Conner’s)
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ResultsResults• only 1 test showed differences between groups:
• CPT
• 2 of 7 tests in battery > 1.s.d. below mean• impaired score indicated ADHD• unimpaired score does not rule out ADHD• 3 most sensitive tests
• Trails B
• Digit Span
• CPT Index• multiple scores
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Diagnostic Efficiency:Sensitivity
• moderate sensitivity (.62)• proportion who have disorder who have a
positive score (indicating deficit)• of those who have disorder (21), how
many impaired scores (13)• high true ‘positives’ (impaired scores)
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Diagnostic Efficiency:Specificity
• strong specificity (.91)• non-disordered who do not have
positive test score• of the controls, how many did
not have impaired scores (didOK on test) (22)
• high true ‘negatives’
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Positive Predictive PowerPositive Predictive Power
• strong positive predictive power (.87)• proportion who receive impaired score
who have disorder• of the impaired scores (15) how many were
from ADHD (13)
• moderate overall predictive power (.77)• proportion correctly classified by a test
score
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Negative PredictivePower
• strong negative predictive power (.71)• proportion who no not have impaired score
and who do not have disorder• of the non-impaired scores (did OK on test -
28), how many were in the control group(20)
• odds ratio of 16.25• ration of odds of disordered individual
getting impaired score to non-disorderedwho receive non-impaired score
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Graph of Sensitivity/Specificity Stats
DIagnostic Utility
0
5
1 0
1 5
2 0
2 5
ADHD Control
Groups
Nu
mb
er
of
Su
bje
cts
ok scores
impaired scores
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Predictive Power Stats
Predictive Power
05
1 01 52 02 53 0
impairedscores
OKscores
Scores
Nu
mb
er
of
Su
bje
cts
Control
ADHD
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Bottom Line...
• An OK score is not informative• can still have the disorder• a false negative
• An impaired score is a prettygood indication of ADHD (H/I orMixed)
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Summary
• CPT is most sensitive to disorder• obtaining 2 impaired scores in
battery of (these) 7 tests is goodindication of the disorder
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Co-Occurrence ofCo-Occurrence ofADHD with CAPDADHD with CAPD
• ADHD (especially sustained attention deficits) ismultimodal
• to the extent that ADHD represents an inability toregulate behavior, CAPD represents a morespecific dysfunction
• deficient auditory processing can cause attentionproblems
• structural deficits in ADHD do include auditoryprocessing areas
• PT, aud. area of CC, possibly Heschel’s gyrus
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Study of Comorbidity ofCAPD & ADHD
• Riccio, et al 1994
• previous studies have shown that many kids withADHD have CAP deficits
• 30 kids with CAPD• 18 had ADHD• not all CAPD met criteria for ADHD• 26 (87%) from sample had been identified
as learning disabled• difficult to determine if ADHD behaviors
were due to poor auditory function
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Differentiating ADHD andDifferentiating ADHD andCAPDCAPD
• Both can have attention deficits• ADHD are an output disorders
• Reduced rate of information processing• as measured by output
• Executive dysfunction• CAPD is an input disorder
• Executive dysfunction as a secondarysource of listening problems
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Study: Relative Rank Orderof AP & ADHD Problems
ADHD• Inattentive• Distracted• Hyperactive• Fidgety/restless• Hasty/impulsive• Interrupts
CAPD• Difficulty hearing in
bckgrnd. noise• Difficulty following oral
instructions• Poor listening skills• Academic difficulties• Poor auditory association
skills• Distracted• Inattentive
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Differences inAuditory Function
• See Chermak• Possible differences in in auditory
functions:• Ear differences• Noise interference response• Word recognition errors based on
acoustic or semantic properties• Response latencies and variability
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GeneralGeneralConclusionConclusion
ADHD Diagnosis rests on:• Good history of symptoms• Evidence across domains
and/or• Neuropsychological data
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But…
• ADHD is a categorical diagnosisthat does not reflect etiology;
• And does not rule out otherdisorders
• In fact, ADHD dx. May besecondary to many otherproblems/disorders
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Thank you
This presentation is posted at:www.dartmouthpsychiatry.org/healthinformation.htm
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Some References
• Barkley (1996). Relation of attention toexecutive function. In Lyon andKrasegenor (Eds.) Attention, memory andexecutive function. Brookes
• Cacace, A., McFarland, DJ (1998).“Central auditory processing disorder inschool aged children: A critical review.”Journal of Speech, Language andHearing research 41: 355-373.
• Chermak, G. D., J. W. Hall, 3rd, etal. (1999). “Differential diagnosis andmanagement of central auditory