Liaison Psychiatry 1.2 Flashcards
Risk factors for Depression in Parkinsons
Female Younger onset Prominent right-sided lesions Bradykinesia and gait-disturbance Rapid disease progression Poorer cognitive status and activities of daily living
What is apathy without depression linked to in Parkinsons?
Executive dysfunction
What is mania linked to in Parkinsons?
Levodopa
Dopamine agonists
When is risk of drug-induced mania increased in Parkinsons?
Pre-existing bipolar
FHx of bipolar
Side effects of Levodopa
Hypomania
Pathological gambling
Hypersexuality
Hallucinations
Rate of drug-induced hallucinatinos in Parkinsons
20% - mainly visual
Rate of drug-induced delusions in Parkinsons
3-30%
Treatment of drug-induced psychosis in Parkinsons
<100mg/day of Clozapine
Quetiapine
When does cognitive impairment suggest poor prognosis of Parkinsons?
If present at time of initial referral
Risk factors of cognitive impairment in Parkinsons?
Older age
Late onset
Low socio-economic status and education
Presence of EPSEs
Neurobiology of those with Parkinsons and cognitive impairment
Frontal executive dysfunction with subcortical pattern of dementia
Neuroleptic sensitivity
Treatment for cognitive impairment in Lewy Body Dementia?
Rivastigmine
Treatment for Parkinson related dementia>
No drugs licensed
What is Huntingtons Disease?
Progressive neurodegenerative disorder with chorea and dystonia, incoordination, cognitive decline and behavioural difficulties with AD high penetrance pattern of inheritance.
Onset of sx of Huntingtons
Middle age
Prevalence of psychiatric sx in Huntingtons at first presentation?
30%
Suicide rates in patients with Huntingtons
4x higher than general population
How many patients with Huntingtons first present with schizophreniform psychosis?
3-6%
When can OCD-like sx occur in Huntingtons?
If basal ganglia involvement
What is the mutant protein in Huntingtons?
Huntingtin
What results in Huntingtin mutation?
Expanded CAG repeat leading to polyglutamine strand of variable length at N terminus.
This tail confers toxic gain of function
Where is gene for Huntington Disease?
Short arm of chromosome 4, associated with expanded trinucleotide repeat.
When is Huntingtons fully penetrant?
CAG repeats reach 41 or more
When does Huntingtons show incomplete penetrance?
36-40 repeats
How many repeats is associated with no Huntingtons disorder?
35 or less
How much does number of CAG repeats account for variation in age of onset of Huntingtons?
60%
Penetrance of Huntingtons
95%
How many patients present with Wilsons disease via psychiatric presentations?
20%
How many patients with Wilsons disease will have psychiatric abnormalities at some point?
50%
Most common psychiatric sx of Wilsons?
Personality disturbance
Mood abnormalities
Cognitive dysfunction
Which form of Wilsons have psychiatric manifestations usually?
Neurological rather than hepatic
How many patients with Wilsons have cognitive impairment?
25%
What type of dementia occurs in Wilsons?
Frontosubcortial pattern of dementia
How many patients with Wilsons have depression?
30%
How many patients with Wilsons show suicidal behaviour?
4-16%
How many patients with Wilsons have psychosis?
2%
How many patients with Wilsons have Kayser-Fleischer rings
95% of those with neurological sx
50-60% of those without neurological sx
10% of asymptomatic siblings
What does MRI show in patients with Wilsons?
Intense hyperintensity of midbrain with relative sparing of red nucleus, superior colliculus and part of pars reticulata of substantia nigra
Hypointensity of aqueduct - called Giant Panda sign
Treatment of Wilsons
Copper chelating or depleting agents
What is essential for treatment of Wilsons?
Early diagnosis and initiation of treatment
Diagnostic criteria of transient global amnesia
Witnessed attacks with information available from observer
Clear-cut anterograde amnesia during attack
Absence of clouding of consciousness & loss of personal identity
Cognitive impairment limited to amnesia only
No accompanying focal neurological symptoms during attack and no signs afterwards
Absence of epileptic features
Attack resolves within 24 hours
Exclusino of patients with HI or active epilepsy
Rate of transient global amnesia
5-10/100,000 per year
Rate of transient global amnesia in those >50 years of age
30/1000,000 per year
Aetiology of transient global amnesia
Hypoperfusion in temporal and parietotemporal regions, mainly left hemisphere
Characteristics of transient global amnesia
Abrupt onset of anterograde amnesia characterised by significant new learning deficit.
Mild confusion and lack of insight into problem but intact sensorium.
Episode length of transient global amnesia
6-24 hours
Recurrence rate of transient global amnesia
Most patients show complete improvement but recurrence is high
What happens in Fahrs disease?
Idiopathic progressive calcium deposition in basal ganglia
Onset of Fahrs disease
20-40 years
40-60 years
What is Fahrs disease at 20-40 years associated with
Schizophreniform psychoses
Catatonic sx
What is Fahrs disease at 40-60 years associated with?
Dementia
Choreoathetosis
How many patients with Fahrs disease have psychiatric sx?
50%
What do psychiatric sx correlate with in Fahrs disease?
More extensive calcification
Cognitive impairment in Fahrs disease?
Frontosubcortical type
Neurological sx of Fahrs disease
Parkinsonism Chorea Dystonia Tremor Gait disturbance Dysarthria Seizures Myoclonus
MRI sign of Fahrs disease
Hypointensity of striatum
Commonest cause of viral encephalitis?
Herpes simplex encephalitis
Commonest cause of limbic encephalitis
Herpes simplex encephalitis
What is affected in limbic encephalitis?
Temporal lobe
Limbic circuit
How many patients with Herpes Simplex Encephalitis have Herpes Simplex Type 1?
70%
What type of Herpes Simplex Encephalitis are immunocompromised patients likely to have?
Herpes Simplex Type 2
HHV 6 or 7
Sx of HSE?
Abrupt onset of confusion, memory impairment and seizures
Depression
Psychosis
Fever
How many patients with HSE show psychiatric disturbance?
70%
Neuroimaging results of HSE
Signal change and swelling within temporal lobes on MRI
What does CSF show in HSE
Lymphocytosis and raised protein
Gold standard test for HSE
CSF PCR for herpes viruses
Most sensitive investigation for detecting early lesions in HSE
MRI
Earlier signs in EEG of HSE
Non-specific slowing
Later signs in EEG of HSE
High voltage periodic lateralizing epileptiform discharges
Fatality of HSE is untreated
70%
Treatment of HSE
IV aciclovir
By how much does IV aciclovir reduce mortality of HSE?
To 20-30%
How long does treatment need to continue for HSE?
14 days.
Longer in immuno-compromised patients
What is the most common cause of Kluver-Busy syndrome?
HSE
Sx of Kluver-Bucy syndrome?
Emotional blunting
Hyperphagia
Visual agnosia
Inappropriate sexual behaviour
What causes sx of Kluver-Bucy Syndrome?
Bilateral temporal lobe damage
What can be used to control sx in Kluver-Bucy Syndrome?
Carbamazepine
Who described Meige Syndrome?
Henri Meidge in 1904
What characterisis Meige syndrome?
Repetitive blinking, chin thrusting, lip pursing or tongue movements.
What causes secondary Meige’s syndrome?
Antipsychotics
Levodopa
Lewy Body Dementia
Which patients are more likely to get Meige Syndrome?
Female
Middle Age
When do symptoms of Meige syndrome disappear?
During sleep
What can help lessen symptoms of Meige syndrome?
Chewing gum
Whistling
Touching face
Peak incidence of HI
15-24 years
What does concussion cause?
Transient coma for hours followed by complete clinical recovery
What can contusion cause?
Prolonged coma
Focal Signs
Lasting brain damage
Mechanism of traumatic brain injury
Axonal and neuronal damage from shearing and rotational stresses of decelerating brain, often at sites of opposite impact (contrecoup effect)
Damage from direct trauma
Brain oedema and raised ICP
Brain hypoxia and ischaemia
What types of amnesia occur after HI?
Post-traumatic
Retrograde
What is post-traumatic amnesia?
Amnesia for period of injury and period following injury until normal memory resumes. Usually anterograde
What is retrograde amnesia post-HI?
Dense amnesia for period between last clearly recalled memory prior to injury to the injury itself.
Usual duration of post-HI retrograde amnesia?
Minutes
Reduces with time
Poor prognostic factors of psychiatric morbidity following traumatic HI?
Long duration of LOC Long PTA Elderly Chronic alcohol use Diffuse brain damage New onset seizures Focal damage to dominant lobe
What is used to assess severity of HI?
GCS after 24 hours
Length of coma
PTA
Abbreviated Injury Scale
What is used to predict functional outcome after HI?
Length of coma
PTA
What is used to predict survival after HI?
Abbreviated Injury Scale
Classification of mild HI
PTA <60 minutes
Classification of moderate HI
PTA between 1-24 hours
Classification of severe HI
PTA 1-7 days
Classification of very severe HI
PTA >7 days
Functional outcome for mild HI
Return to work in <1 month
Functional outcome in moderate HI
Return to work in 2 months
Functional outcome for severe HI
Return to work in 4 months
Functional outcome in very severe HI
May require >1 year for return to work
In which type of HI is cognitive impairment common
After closed HI with PTA >24 hours
In which type of HI is personality change common?
HI to orbitofrontal lobe or anterior temporal lobe
How many patients with
25%
What predicts depression in patients with HI?
Proximity of lesion to left frontal lobe
In which type of HI might there by schizophrenia-like psychosis with prominent paranoia?
Left temporal injury
In which type of HI might there by affective psychoses?
Right temporal or orbitofrontal injury
Prevalence of schizophrenia in HI
2-5%
Post-traumatic epilepsy in HI
5% in closed
30% in open
When does concussion syndrome occur?
Following mild-moderate HI
Sx of post-concussion sx
Headache Dizziness Fatigue Poor memory and concentration Irritability Depression Sleep disturbance Restlessness Sensitivity to noise Blurred/double vision Nausea Photophobia Tinnitus
How many patients with post-concussion recover?
50% recover within 3 months
Aetiology of post-concussion
Diffuse microscopic anxonal head injury
Macroscopic brain lesions in 8-10% of people, mainly in frontal, temporal and deep white matter
In which patients with post-concussion is there slower recovery?
Age >40 years Previous HI Alcohol/substance misuse Psychological factors Females
What is severity of sx of post-concussion correlated with?
Severity of neuropsychological impairment in speed of information processing
Which psychosocial factors is post-concussion associated with?
Anxiety & depression
Stress
Time off work
Seeking compensation
What has been shown to reduce sx of post-concussion?
Early interventino in first few weeks
Single hour-long assessment and treatment session
Education & reassurance
What are dyssomnias?
Primary sleep disorders which cause either difficulty getting off to sleep or remaining asleep or excessive sleepiness during the day.
What are dyssomnias divided into?
Primar insomnia Primary hypersomnia Circadian sleep disorders Narcolepsy Breathing related sleep disorders Sleep state misperception
What are parasomnias?
Disorders which intrude into the sleep process
What are parasomnias divided into?
Arousal disorders (NREM sleep) Sleep-wake transition REM sleep parasomnias Sleep bruxism Sleep enuresis
What disorders come under arousal disorders?
Confusional arousals
Sleepwalking
Sleep terrors
What disorders come under sleep-wake transition?
Sleep starts
Sleep talking
What disorders come under REM sleep parasomnias?
REM behavioural disorder
Nightmares
Sleep paralysis
What comes under Sleep-related movement disorders?
Restless leg syndrome
Periodic limb movement disorder
Sleep-related bruxism
What comes under sleep disorders in ICD 10?
Nonorganic insomnia Nonorganic hypersomnia Nonorganic disorder of the sleep-wake schedule Sleepwalking (somnambulism) Sleep terrors Nightmares
What is the most common circadian sleep disorder?
Delayed sleep phase syndrome
What happens in delayed sleep phase syndrome?
Patient is unable to fall asleep until very early morning.
Prevalence of narcolepsy
0.025%
Symptoms of narcolepsy
Excessive daytime sleepiness Sudden sleep attacks (narcolepsy) - sleep is refreshing (REM) Cataplexy Sleep paralysis Hypnagogic hallucinations
How many patients with narcolepsy have cataplexy?
75%
How many patients with narcolepsy have sleep paralysis?
30%
How many patients with narcolepsy have all 4 sx: narcolepsy, cataplexy, sleep paralysis and hypnagogic hallucinations?
10%
How many patients with narcolepsy have automatic behaviours?
33%
Is sleep duration increased in narcolepsy?
No - reduced and fragmented nocturnal sleep
What is strongly associated with narcolepsy?
HLA-DQB1*0602
Low concentration of hypocretin-1 in CSF
What does sleep polysomnogram show in narcolepsy?
Sleep latency <10 minute
Sleep-onset REM periods
Treatment for narcolepsy
Methylphenidate
Modafinil
Treatment for Cataplexy
Imipramine
Prevalence of OSA
Men 4%
Women 2.5%
Sx of OSA
Loud snoring Breathing pauses Mouth breathing Restless sleep Increased perspiration at night Excessive daytime sleepiness Morning headaches Behavioural changes
What might occur in untreated OSA?
Right-sided cardiac failure
What is sleepwalking?
Partial arousal during slow-wave stages 3 and 4.
When is sleepwalking most common?
During initial third sate of sleep
What are night terrors?
Recurrent episodes of abrupt awakening from sleep characterised by panicky scream with intense fear and autonomic arousal.
Individual has no recollection of evens and is unresponsive during episodes.
When do night terrors occur?
During first third of night
During stages 3-4 of NREM sleep
How does REM sleep behavioural disorder occur?
No loss of muscle tone in REM sleep so dreams are acted as complex behaviours.
When do REM sleep behavioural episodes occur?
Middle to latter third of night during REM sleep
Which disorders is REM sleep behavioural disorder associated with?
Parkinsons
Diffuse lewy body disease
MSA
GBS
What can REM behavioural disorder be prodrome of?
Diffuse Lewy body disease
Parkinsons
Precede diagnosis of movement disorder by years
What type of lesions is REM behavioural sleep disorder associated with?
Lesions in brainstem
Treatment of REM behavioural sleep disorder?
Clonazepam
Make sleeping environment safe
Diagnostic criteria for REM behavioural sleep disorder?
Movements of body or limbs associated with dreams and at least one of:
potentially harmful sleep behaviour
Dreams that appear to be acted out
Sleep behaviour that disrupts sleep continuity
Diagnostic criteria for restless leg syndrome in patients >12 y/o
Akathisia usually accompanied by paresthesia (core feature)
Motor restlessness
Sx worse at rest
Sx worse at night
What characterises restless leg syndrome
Unpleasant sensation in legs that preclude smooth transition from wakefulness to sleep.
How many patients with restless leg syndrome have periodic movements during sleep?
80-90%
Prevalence of restless leg syndrome
3-15%
M:F ratio of restless leg syndrome
1:2
How many patients with restless leg syndrome show a familial pattern?
> 50%
Predisposing factors to restless leg syndrome?
Iron deficiency Peripheral neuropathy Sedating antihistamines Centrally acting dopamine receptor antagonists - metoclopramide, prochlorperazine Antipsychotics Caffiene Antidepressants
Treatment of restless leg syndrome
Sleep hygiene Relaxation techniques Dopaminergic agents Anticonvulsants Opiods Clonazepam
First licensed drug for restless leg syndrome
Ropinirole
Which dopaminergic agents can be used for restless legs?
Nonergot D2 agonists: ropinrole, pramipexole
Bromocriptine and dopaminergic precursors: levodopa/carbidopa
Which anticonvulsants can be used for restless legs?
Gabapentin
CBZ
Which opioids can be used for restless legs?
Oxycodone
Propoxyphene
What is Periodic Limb Movement Disorder?
Periodic episodes of repetitive and stereotyped limb movements during sleep.
Can cause clinical sleep disturbance.
What is required for diagnosis of Periodic Limb Movement Disorder?
Polysomnographic documentation of increased number of episodes in association with significant disruption fo sleep architecture and symptomatolgy.
What are polysomnographic diagnostric critera for PLMS based on?
EMG of right and left anterior tibialis muscles.
What does rate of PLMS increase with?
Age
How many patients with PLMS also have Narcolepsy?
45-65%
How many patients with PLMS also have REM sleep behavioural disorder?
70%
What pathology has been linked to PLMS?
Dopaminergic impairment
Fe deficiency
Treatment for PLMD
Sleep hygeine
When is medication warranted for PLMD?
If sleep disruption
Medication treatment for PLMD?
Similar to restless legs
What is bruxism considered to be?
Stereotyped movement disorder or rhythmic disorder
When is bruxism more frequent?
Early part of sleep
May be related to stress/anxiety
May be related to dentition abnormalities/stimulant use
What type of disorders is related to initial insomnia?
Anxiety
What type of disorders are related to middle insomnia?
Medical illness
Pain syndromes
Depression
What type of disorders are related to Terminal insomnia?
Depression