PH3113 - Psychiatric Disease and its Pharmacology 4 Flashcards

1
Q

What is the treatment for narcolepsy?

A

Modafinil
- first line
Methylphenidate
- second line
Modafinil with sodium oxybate
- third line
Antidepressants
- may improve sleep paralysis or hallucinations
- tri-cyclic antidepressants
- clomipramine
- selective serotonin reuptake inhibitors
Benzodiazepines
- short acting
- only in refractory cases

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2
Q

What is the largest single disease burden in the UK?

A

Mental illness
- costs £105bn/year

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3
Q

How many people suffer a mental health illness per year?

A

1 in 4 people

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4
Q

What is the leading cause of death of men between 18 and 45 years old?

A

Suicide

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5
Q

What is psychosis?

A

Symptom of the mind under severe distress
- lack of sleep
- physical illness
- induced by drugs
- psychiatric illness

During a period of psychosis, a person’s thoughts and perceptions are disturbed
- the individual may have difficulty understanding what is real and what is not

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6
Q

What is the prevalence of schizophrenia?

A

Chronic, relapsing, severe mental illness affecting approximately 1% of the population
220,000 people in UK currently being treated
Appears in early adulthood
- 18 - 30 years
1:1 ratio M:F
Costs £11bn/year to society
Unemployment high
- 80 - 90%
Chronic, debilitating
- 5 - 10% of sufferers may commit suicide
- 25% never recover
- account for majority of long-stay psychiatric patients

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7
Q

What is schizophrenia characterised by?

A

Prodrome
- social isolation
- loss of interest
Distortions of thinking and perception
- positive symptoms
Inappropriate or blunted affect and cognitive symptoms
- negative symptoms

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8
Q

How is schizophrenia diagnosed?

A

Diagnosis (ICD-10) based on at least one of:
- thought interference
- delusions of control
- auditory hallucinations giving running commentary
- persistent delusions being completely reasonable

Or at least two of:
- hallucinations in any modality with delusions/overvalued ideas
- disorganised speech
- neologisms
- catatonic behaviour
- posturing
- stupor
- negative symptoms
- apathy
- paucity of speech
- incongruent emotional responses
- significant change in personal behaviour and personality

Duration of 1 month of greater

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9
Q

What are delusions?

A

An unshakeable, false belief, based on a mistaken interpretation of reality inconsistent with the person’s cultural background

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10
Q

What are hallucinations?

A

A perception in the absence of an external stimulus
- auditory
- running commentary
- voice or voices giving a description of a person’s actions
- command
- voice or voices giving instructions or orders
- thought interference
- broadcasting
- withdrawal
- interference
- visual
- olfactory
- tactile
- gustatory

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11
Q

What are the negative symptoms of schizophrenia?

A

Blunted affect
- hard to express emotions
- movements
- tone of voice
- facial expression
Social withdrawal
Avolition
- lack of motivation
Poverty of speech
- not speaking
Cognitive deficits

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12
Q

What is the aetiology of schizophrenia?

A

Biological factors
- genetics
- multifocal
- 50% inheritance in monozygotic twins
- obstetric complications
- neurochemical and structural abnormalities
- dopamine hypothesis
- glutamate hypothesis
- serotonin hypothesis
Environmental factors
- urban areas
- socioeconomic status
- drift hyprothesis
- seasonality of births
- viral
- melatonin
- migration
- 10 x prevalence in immigrant populations
- life events and background stressors
- cannabis and other drug use

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13
Q

What is the dopamine theory in schizophrenia?

A

Increased mesolimbic dopamine transmission mediates positive symptoms of schizophrenia
- amphetamine increases dopamine transmission in mesolimbic cortex
- associated with positive symptoms
- antipsychotics are dopamine antagonists
Negative symptoms may result from reduced dopaminergic activity in the prefrontal cortex

Plasma prolactin is normal
- dopamine inhibits release
Levels of metabolites of dopamine are normal
Brain levels of dopamine are normal
Tyrosine hydroxylase or mono-amine oxidase levels are normal
Modest increase in D2-receptor density in the striatum

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14
Q

What role does the mesolimbic pathway play in schizophrenia?

A

Excess activity implicated in
- positive symptom schizophrenia
- hallucinations
- delusions

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15
Q

What role does the mesocortical pathway play in schizophrenia?

A

Diminished activity implicated in
- negative symptom schizophrenia
- restrictions in
- emotion
- thought
- speech
- pleasure and attention

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16
Q

What is the serotonergic (5-HT) theory in schizophrenia?

A

No consensus in role of 5-HT
- LSD produces symptoms akin to schizophrenia
- cerebrospinal fluid (CSF) studies of 5-HT metabolites
- post-mortem studies in schizophrenia
- increase in 5-HT transmission and 5-HT transporter density in sub-cortical regions
- no change or decrease in cortical regions
- decrease or no change in 5-HT2 receptor density in pre-frontal cortex

Drug studies
- agonist studies
- administration of m-chlorophenylpiperazine (mCPP)
- a 5-HT partial agonist
- exacerbates symptoms in unmedicated schizophrenics
- no effect in healthy volunteers
- many antipsychotics act at 5-HT2 receptors as antagonists
- dampen down 5-HT receptors

17
Q

What is the role of glutamate in schizophrenia?

A

Abnormalities in glutamate activity may underlie other neurochemical changes
Recent imaging studies have revealed increased glutamatergic activity in patients unresponsive to antipsychotic treatment
- not dopaminergic

18
Q

What is the treatment for schizophrenia?

A

Assessment
- ruling out non-psychiatric causes of psychosis
- drugs
Psychological interventions
- psychoeducation
- CBT for psychosis
- voice hearing groups
- family work
Social interventions
- occupational therapy
- housing
- employment
- supported accommodation
Biological
- antipsychotic medication