Final Flashcards
Comorbidity and schizophrenia
- Comorbid with variety of other disorders, especially depression and substance abuse/ dependency
Social drift
The tendency for people with schizophrenia to drift down to lower social and economic levels
Cost schizophrenia
About 6.85 billion annually in Canada
3 phases of schizophrenia
- Prodromal phase
- Active phase
- Residual phase
Prodromal phase
- obvious deterioration in functioning, development of schizotypal personality disorder
Active phase
Symptoms such as hallucinations, delusions, disorganized speech
Residual phase
Similar to the prodromal phase
Hallucinations, delusions, etc. Improve
Positive symptoms
Abnormal additions to mental life, including the hallucinations, delusions, and disordered thoughts frequently experienced by schizophrenia patients (hallucinations, delusional belief, disorganized symptoms)
Hallucinations
False perceptions occurring in the absence of any relevant stimulus. Auditory hallucinations are the most common, but they may occur with any sensory modality.
- associated with other symptoms (delusions)
Delusional belief
Idiosyncratic, unreasonable,rigidly held beliefs defended by the patient against all evidence
Disorganized symptoms
Disorganized speech,including loose associations, tangentiality, perseveration
Bizarre behaviour including catatonia, unpredictable movements (motor symptoms), incongruity of affect and behaviour, grossly disorganized behaviour
Loosening of association
Loss of logical or conventional connections between ideas or words; shifts quickly from one topic to another
Catatonic behaviour
Rigid body positions assume by people with schizophrenia
Negative symptoms
Deficits and loses in normal functioning
- Affective and emotional disturbances (affective flattening and anhedonia)
- apathy, avolition, alogia (social withdrawal, indecisiveness, poverty of thought content, thought blocking)
Affective flattening
Lack of emotional expression and response
Anhedonia
A loss of pleasure or interest in almost all activities or a lack of reactivity to usually pleasurable events
DSM-5 classification schizophrenia A.
A. Two (or more) of the following, each present for a significant portion of the time during a one month period (or less if successfully treated). At least 1 must be 1,2, or 3
- Delusions
- Hallucinations
- Disorganized speech
- Grossly disorganized such as catatonic behaviour
- Negative symptoms (affective flattening, alogia, or avolition)
DSM-5 classification schizophrenia B-F
B. Level of functioning in one or more areas is markedly below the level achieved prior to onset
C. Continuous signs disturbance persist for at least 6 months. This period must include at least 1 month symptoms that meet criterion A
D. Schizoaffective disorder and depressive or bipolar disorder must be ruled out. If they have been present must be for a small minority duration
E. Not attributable to physiological effects of a substance (drug, medication, or other medical condition
F. History autism/ communication disorder, hallucinations/ delusions must be present for at least 1 month
Lifetime prevalence schizophrenia
Between .5 and 1%
Incidence schizophrenia
1 per 10,000 per year
Mean age onset schizophrenia
Between 20-35
Mean duration of schizophrenia
15 years
Is prevalence schizophrenia equal in men and women?
- men and women experience the disorder equally
- men experience symptoms 4-5 years earlier than women, are more likely to exhibit negative symptoms and to have a chronic, deteriorating course
Genetic contribution
The influence of genes on the development of a mental illness or disorder
Epigenetics
The study of modifications of gene expression that are caused by mechanisms other than changes in the underlying DNA sequence
Schizophrenia study genomics discoveries
- many genes involved govern the functioning of neurotransmitters such as dopamine and glutamate
- the strongest findings concern chromosome 6, which is heavily involved in immune functioning
- many alleles that indicate high risk for schizophrenia also indicate high risk for bipolar disorder
Schizophrenia as a neurodevelopmental disorder?
Recent research found allele mutations, deletions and duplications might play a role in schizophrenia
Neuropsychological testing indicates that most people with schizophrenia are:
Cognitively impaired and may have a low IQ
Brain imaging reveal diffuse brain pathology in schizophrenia. Of note are:
- abnormally reduced frontal brain volumes and frontal brain blood flow
- abnormalities in the left temporal lobe, which is strongly connected to the frontal lobes, the amygdala, and the hippocampus
Dopamine hypothesis
- he theory that dopamine plays a major role in schizophrenia
- studies drugs either inhibit dopamine (antipsychotics) and observations many drugs stimulate dopamine cause hallucinations
Other neurotransmitters and schizophrenia
- dopamine
- serotonin
- glutamate (lower levels in prefrontal cortex and the hippocampus)
Etiology schizophrenia- developmental factors
- most people diagnosed with schizophrenia show problems in childhood
- pregnancy and birth complications including prolonged labour, preterm delivery, low birth weight, and fetal distress may play a role
- proportion children at risk shoe early signs of motor impairment, cognitive limitations, social withdrawal, and aggression
Etiology psychosocial factors schizophrenia
- occurs more often in low SES
- emergence and surge schizophrenia coincided with industrial revolutions and increased urbanization under very poor conditions
- associated with urban living
- developmental factors (which influences which?)
Cognitive problems and schizophrenia
- impaired problem solving
- memory deficits
- impaired learning and word recall
Research supported subtypes schizophrenia
- impaired problem solving
- memory deficits- memory impaired
- cognitively impaired
- cognitively normal
Diathesis
A predisposition or vulnerability for the development of an illness or disorder
Hypokrisia
In Meehl’s theory, the reduced selectivity with which nerve cells respond to stimuli, especially as seen in schizophrenia
Meehl’s theory
- biological diathesis (Hypokrisia) caused by single gene
- expression gene affected by other genetic characteristics and psychosocial circumstances leads to cognitive slippage
- cognitive slippage + aversive drift = schizotypia
- moderator characteristics such as intelligence, artistic talent, and personality traits likely influence functioning and may lead to emergence of full blown schizophrenia
Cognitive slippage
The mental consequences of Hypokrisia, namely loss of integrated thinking and coherent mental life
Aversive drift
In Meehl’s theory, the tendency for people with a genetic predisposition for schizophrenia to be perceived negatively end subjected to personal rejection, leading progressively to social withdrawal and alienation
Schizotype
A person experiencing cognitive slippage and aversive drift
Expressed emotions (EE)
Negative or intrusive attitudes and behaviours directed at the patients (associate in relapse in diagnosed patients)
Integrated theories
Interaction between genetics and psychosocial factors probably best explain schizophrenia