Chapter 13 Schizophrenic Disorders Copyright © 2006 Pearson Education Canada Inc.
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Transcript of Chapter 13 Schizophrenic Disorders Copyright © 2006 Pearson Education Canada Inc.
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Chapter 13Schizophrenic Disorders
Copyright © 2006 Pearson Education Canada Inc.
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Overview
Schizophrenia is a severe, progressive disorder than often starts in adolescence and generally has a poor outcome
affects 1% of the population 221,000 Canadians in 1996 Canadian health care: $ billions annually
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Overview
Similar prevalence for men and women - men are slightly higher
for men onset is age 15-25 - average 21.9 for women onset is age 25-35 - average 26 71% will experience their 1st symptoms by 25 y/o Key feature: psychotic symptoms -
profound disturbance in thought, reality-testing, and affect.
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Course of Schizophrenia
• Prodromal – (usually in adolescence) - decreased level of functioning, social
withdrawal, peculiar behaviours, neglect hygiene, changes in emotion
• Active– full spectrum of psychotic symptoms - i.e., hallucinations, delusions,
disorganized speech
• Residual –return to prodromal but may also be mild delusions/ hallucinations/
continuing negative symptoms and impairment
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Symptoms and Features
Positive symptoms– look for presence of delusions and
hallucinations– Hallucinations: sensory experiences not
caused by external stimulus– includes voices commenting on client’s
behaviour or giving instruction
– 60% of all hallucinations are auditory
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Positive Symptoms
Hallucinations– auditory: often insulting or instructing – tactile (e.g., something crawling under skin)– somatic (e.g., an alien residing in the
stomach)
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Positive Symptoms
Delusions: idiosyncratic beliefs that are rigidly held despite their logical nature
– defended even when shown contradictory evidence
– person is preoccupied with the beliefs
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Positive Symptoms
Delusions: persistent psychotic beliefs– persecutory (e.g., “others are spying on
me”)– reference
objects, people, events given personal significance (e.g., “the radio announcer is mocking me”)
– grandeur (e.g., “I am Jesus”)
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Symptoms and Features
Negative symptoms
– look for absence: poverty of speech, thought, hygiene, movement
– causes social withdrawal
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Negative Symptoms
Affective Disturbance– flattened affect: failure to exhibit signs of emotion– inappropriate affect: incongruity of emotional state
and behaviour– anhedonia: inability to experience pleasure
Social and Linguistic Deficits– apathy– avolition– alogia
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Disorganization
Thinking– loose associations: abruptly shifting topics– disorganized speech: saying things that don’t make
sense– tangentiality: irrelevant responses
Behaviour– catatonia: immobility and muscular rigidity– stupor– robot-like movements
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Historical Perspective
dementia praecox (Kraepelin)splitting of associations (Bleuer) first ranked symptoms (Schneider)
– thought broadcasting
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Contemporary Perspective: DSM-IV-TR
emphasis on 3 types of symptoms– positive symptoms– negative symptoms– disorganization
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DSM-IV-TR Criteria for Schizophrenia
During a one-month period, two or more of the following symptoms:
delusions hallucinations disorganized speech grossly disorganized / catatonic behaviour negative symptoms
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Subtypes: A) Catatonic
stupor excitement
– pacers, runners
posturing
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Subtypes: B) Disorganized
disorganized, garbled speechdisorganized, “crazy” behaviourwildly inappropriate affect
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Subtypes: C) Paranoid
preoccupation with one or more systematic delusions or auditory hallucinations
theme of persecution or grandiosityno catatonic or disorganized symptoms
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Subtypes: D) Undifferentiated
meets the criteria for schizophrenia but does not fit the other subtypes
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Subtypes: E) Residual
no current active phase symptomscontinuing negative symptoms
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Delusional Disorder : preoccupation with nonbizarre delusions for at least one month
Non-bizarre delusion – being followed, poisoned, deceived, spied on, or loved
from a distance (erotomania)
Usually no odd behaviours, hallucinations, or negative symptoms
Other Psychotic Disorders
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Other Psychotic Disorders
Schizoaffective Disorder– mix of schizophrenia and mood disorder, but psychotic
symptoms are present at some point without mood d/o Schizophreniform Disorder
– less than 6 months Brief psychotic Disorder
– psychotic symptoms for 1 day to one month – typically after major trauma
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Course and Outcome
Onset: Sudden vs. Gradual Course: Undulating or Gradual Outcome: Recovered/Mild Impairment vs.
Moderate/severe Impairment
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Suicide and Schizophrenia
Risk is 8-9 times normal population50% attempt suicide1.9% a year die by suicideUltimately 10-13% successful
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Epidemiology
Culture– cross-cultural consistency – improved prognosis in developing countries
Social Class – adverse social and economic circumstances increases
the probability that persons who are genetically predisposed will develop clinical symptoms
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Etiology: Biological Factors
geneticsneurological impairmentsneurochemical irregularities
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Genetics
risk is greater is family member is affected 10-15 risk for first line relatives 3% for second line relative 46% if both parents are affected twin concordance rates
– MZ: 48 %– DZ: 17 %
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Neuropathological Correlates
Structural and functional anomalies in frontal cortex and limbic areas:– enlarged ventricles– decreased hippocampal size – asymmetry in temporal cortex processing
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Neurochemistry
dopamine hypothesis– neuroleptic drugs block post-synaptic
dopamine receptors– excessive post-synaptic receptors?
interactions of multiple neurotransmitters (e.g., GABA, serotonin)
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Other Potential Biological Factors
intrauterine insult and birth complications
viral infectionsseason of birth
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Epidemiology: Psychological Factors
Expressed Emotion (EE) – related to rate of relapse– patients who returned home to at least 1
member who has high EE were more likely than low EE families to relapse
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Treatment
Antipsychotic Medication
– began in 1950’s (e.g., Thorazine) – reduced the severity of symptoms– 50% showed significant improvement - 4-6 weeks– continued maintenance medication reduced relapse
rate
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Treatment
* Compliance Problems* Motor Side Effects
Extrapyramidal Symptoms: muscular rigidity, tremors, agitation
Tardive Dyskinesia: involuntary movements of the mouth and face, spasmodic movements of trunk and body
– increased use of atypical antipsychotics (clozapine)
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Treatment
Atypical Antipsychotic Medication
– began in 1990’s (e.g., Clozaril, Haldol, Risperdal, Zyprexa)
– As effective in treating positive symptoms; more effective in treating negative symptoms
– 30% of patients who did not improve on other medication improved on atypical antipsychotics
– As with classical antipsychotics, target receptors in the cortex, limbic system, and also acts on serotonin
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Treatment
Other Medications: Antianxiety/Sleeping Medication (Ativan, Valium) Antidepressants (Prozac, Zoloft) Mood Stabilizers (Lithium, Tegretol)
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Treatment
Psychosocial treatment– social skills training (e.g., modeling, role playing)– CBT
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Treatment
Assertive Community Treatment– provide an array of psychological interventions and
medication on a regular basis in the community (e.g., case management)
– effective in reducing inpatient hospital stays
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Treatment
Institutional Programs
– Hospitalization:(2-3 weeks) is often needed for acute psychosis
– Crisis Houses: often provides an alternative to hospitalization. Less expensive - provides learning programs
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Case Study:Marilyn
paranoid schizophreniapsychotic belief in Cabir brothersauditory hallucinations visual hallucinations