ss440: unit 9 schizophrenia and other psychotic disorders 1
TRANSCRIPT
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SS440: Unit 9Schizophrenia and Other Psychotic Disorders
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Nature of Schizophrenia and Psychosis: An Overview•Schizophrenia vs. psychosis
▫Psychosis – broad term (e.g., hallucinations, delusions)
▫Schizophrenia – a type of psychosis •Psychosis and schizophrenia are
heterogeneous▫Disturbed thought, emotion, behavior
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Nature of Schizophrenia andPsychosis: History and Current Thinking
•Historical background▫Emil Kraepelin – used the term dementia
praecox Focused on subtypes of schizophrenia
▫Eugen Bleuler – introduced the term “schizophrenia” “Splitting of the mind”
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Nature of Schizophrenia andPsychosis: History and Current Thinking (continued)
•Impact of early ideas on current thinking▫Many of Kraeplin and Bleuler’s ideas are
still with us▫Understanding onset and course
considered important
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Schizophrenia: The “Positive” Symptom Cluster
•The positive symptoms▫Active manifestations of abnormal behavior▫Distortions of normal behavior
•Delusions: The basic feature of madness▫Gross misrepresentations of reality ▫Include delusions of grandeur or
persecution
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Schizophrenia: The “Positive” Symptom Cluster (continued)
•Hallucinations▫Experience of sensory events without
environmental input▫Can involve all senses▫Findings from SPECT studies
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Schizophrenia: The “Negative” Symptom Cluster
•The negative symptoms▫Absence or insufficiency of normal behavior
•Spectrum of negative symptoms ▫Avolition (or apathy) – lack of initiation and
persistence▫Alogia – relative absence of speech ▫Anhedonia – lack of pleasure, or
indifference ▫Affective flattening – little expressed
emotion
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Schizophrenia: The “Disorganized” Symptom Cluster
•The disorganized symptoms▫Severe and excess speech, behavior, and
emotion•Nature of disorganized speech
▫Cognitive slippage – illogical and incoherent speech
▫Tangentiality – “going off on a tangent” ▫Loose associations – conversation in
unrelated directions
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Schizophrenia: The “Disorganized” Symptom Cluster (continued)
•Nature of disorganized affect▫Inappropriate emotional behavior
•Nature of disorganized behavior ▫Includes a variety of unusual behaviors▫Catatonia – spectrum
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Subtypes of Schizophrenia: Paranoid and Disorganized
•Paranoid type▫Intact cognitive skills and affect▫Do not show disorganized behavior▫Hallucinations and delusions – grandeur or
persecution▫The best prognosis of all types of
schizophrenia
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Subtypes of Schizophrenia: Paranoid and Disorganized (continued)
•Disorganized type▫Marked disruptions in speech and behavior▫Flat or inappropriate affect▫Hallucinations and delusions – tend to be
fragmented▫Develops early, tends to be chronic, lacks
remissions
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Subtypes of Schizophrenia: Catatonic, Undifferentiated, and Residual
•Catatonic type▫Show unusual motor responses and odd
mannerisms▫Examples include echolalia and echopraxia ▫Tends to be severe and quite rare
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Subtypes of Schizophrenia: Catatonic, Undifferentiated, and Residual (continued)
•Undifferentiated type▫Wastebasket category▫Major symptoms of schizophrenia▫Fail to meet criteria for another type
•Residual type▫One past episode of schizophrenia▫Continue to display less extreme residual
symptoms
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Other Disorders with Psychotic Features: Schizophreniform and Schizoaffective Disorder
•Schizophreniform disorder▫Schizophrenic symptoms for a few months▫Associated with good premorbid
functioning▫Most resume normal lives
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Other Disorders with Psychotic Features: Schizophreniform and Schizoaffective Disorder (continued)
•Schizoaffective disorder▫Symptoms of schizophrenia and a mood
disorder▫Both disorders are independent of one
another▫Prognosis is similar for people with
schizophrenia▫Such persons do not tend to get better on
their own
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Other Disorders with Psychotic Features: Delusional Disorder
•Delusional disorder▫Delusions that are contrary to reality▫Lack other positive and negative symptoms▫Types of delusions include
Erotomanic Grandiose Jealous Persecutory Somatic
▫Extremely rare▫Better prognosis than schizophrenia
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Additional Disorders with Psychotic Features
•Brief psychotic disorder▫One or more positive symptoms of
schizophrenia▫Usually precipitated by extreme stress or
trauma▫Tends to remit on its own
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Additional Disorders with Psychotic Features (continued)
•Shared psychotic disorder▫Delusions from one person manifest in
another person▫Little is known about this condition
•Schizotypal personality disorder▫May reflect a less severe form of
schizophrenia
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Schizophrenia: Some Facts and Statistics
•Onset and prevalence of schizophrenia worldwide
•Schizophrenia is generally chronic•Schizophrenia affects males and females
about equally•Schizophrenia has a strong genetic
component
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Causes of Schizophrenia:Findings From Genetic Research
•Family studies▫Inherit a tendency for schizophrenia, not
forms of schizophrenia▫Risk increases with genetic relatedness
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Causes of Schizophrenia:Findings From Genetic Research (continued)
•Twin studies▫Monozygotic twins – risk for schizophrenia
is 48%▫Fraternal (dizygotic) twins – risk drops to
17%▫Adoption studies – risk for schizophrenia
remains high Cases where a biological parent has
schizophrenia
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Search for Genetic andBehavioral Markers of Schizophrenia
•Genetic markers: Linkage and association studies▫Search for genetic markers is still inconclusive▫Schizophrenia is likely to involve multiple genes
•Behavioral markers: Smooth-pursuit eye movement▫The procedure – eye-tracking a moving object ▫Tracking deficits – schizophrenics and their
relatives
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Causes of Schizophrenia: Neurotransmitter Influences
•The dopamine hypothesis▫Drugs that increase dopamine (agonists)
Result in schizophrenic-like behavior▫Drugs that decrease dopamine (antagonists)
Reduce schizophrenic-like behavior▫Examples – neuroleptics, L-Dopa for
Parkinson’s disease▫Dopamine hypothesis is problematic and
overly simplistic▫Current theories – emphasize many
neurotransmitters
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Causes of Schizophrenia:Other Neurobiological Influences
•Structural and functional abnormalities in the brain ▫Enlarged ventricles and reduced tissue
volume▫Hypofrontality – less active frontal lobes
A major dopamine pathway •Viral infections during early prenatal
development ▫Findings are inconclusive
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Causes of Schizophrenia:Psychological and Social Influences
•The role of stress▫May activate underlying vulnerability▫May also increase risk of relapse
•Family interactions▫Families – show ineffective communication
patterns▫High expressed emotion – associated with
relapse
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Medical Treatment of Schizophrenia
• Historical precursors• Development of antipsychotic (neuroleptic)
medications▫Often the first line treatment for schizophrenia▫Began in the 1950s▫Most reduce or eliminate positive symptoms▫Acute and permanent side effects are common
Extrapyramidal and Parkinson’s-like side effects Tardive dyskinesia Compliance with medication is often a problem
• Transcranial magnetic stimulation
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Psychosocial Treatment of Schizophrenia
•Historical precursors•Psychosocial approaches: Overview and
goals▫Behavioral (i.e., token economies) on
inpatient units▫Community care programs▫Social and living skills training▫Behavioral family therapy ▫Vocational rehabilitation
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Summary of Schizophrenia and Psychotic Disorders
•Schizophrenia – spectrum of dysfunctions▫Affecting cognitive, emotional, and
behavioral domains▫Positive, negative, and disorganized
symptom clusters
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Summary of Schizophrenia and Psychotic Disorders (continued)
•DSM-IV-TR ▫Five subtypes of schizophrenia▫Includes other disorders with psychotic
features•Several bio-psycho-social variables are
involved•Successful treatment rarely includes
complete recovery
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