PH3113 - Psychiatric Disease and its Pharmacology 4 Flashcards
What is the treatment for narcolepsy?
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
What is the largest single disease burden in the UK?
Mental illness
- costs £105bn/year
How many people suffer a mental health illness per year?
1 in 4 people
What is the leading cause of death of men between 18 and 45 years old?
Suicide
What is psychosis?
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
What is the prevalence of schizophrenia?
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
What is schizophrenia characterised by?
Prodrome
- social isolation
- loss of interest
Distortions of thinking and perception
- positive symptoms
Inappropriate or blunted affect and cognitive symptoms
- negative symptoms
How is schizophrenia diagnosed?
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
What are delusions?
An unshakeable, false belief, based on a mistaken interpretation of reality inconsistent with the person’s cultural background
What are hallucinations?
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
What are the negative symptoms of schizophrenia?
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
What is the aetiology of schizophrenia?
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
What is the dopamine theory in schizophrenia?
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
What role does the mesolimbic pathway play in schizophrenia?
Excess activity implicated in
- positive symptom schizophrenia
- hallucinations
- delusions
What role does the mesocortical pathway play in schizophrenia?
Diminished activity implicated in
- negative symptom schizophrenia
- restrictions in
- emotion
- thought
- speech
- pleasure and attention