Mental Health Flashcards
Characteristics of vascular dementia ?
Represents cumulative effect of many small strokes:
- sudden onset and stepwise deterioration
- evidence of vascular pathology (hypertension, past stroke, focal CNS signs)
Characteristic presentation of Lewy body dementia ?
- fluctuating cognitive impairment
- detailed visual hallucinations (e.g. Small animals or children)
- Parkinsonism
- histology= Lewy bodies in brainstem and neocortex
Characteristics of picks dementia ?
- frontal and temporal atrophy without Alzheimer’s histology
- linked to genes on chromosome 9
- executive impairment
- behaviour and personality change
- early preservation of episodic memory and spatial orientation
- disinhibition
- hyper orality
- emotional unconcern
What are the positive symptoms of dementia ?
- wandering
- aggression
- flight of ideas
- logorrhoea
Pathogenesis if Alzheimer’s disease
accumulation if beta amyloid peptide (degradation product of amyloid precursor protein) results in:
- progressive neuronal damage
- neurofibrillary tangles
- increased no. Amyloid plaques
- loss of acetylcholine
- defective clearance of beta amyloid plaques by macrophages
- selective neuronal loss
Which areas are vulnerable to neuronal loss in AD ?
- hippocampus
- amygdala
- temporal neocortex and subcortical nuclei
Risk factors for AD ?
- first degree relative with AD
- Down’s syndrome
- vascular risk factors
- depression and loneliness
Presentation of AD ?
Progressive and GLOBAL cognitive impairment (unlike any other dementia which affect certain domains)
- visuospatial skills (gets lost)
- memory
- verbal ability
- executive function
- ansognosia (lack of awareness)
Pharmacological treatment for cognitive decline in AD
- donepezil (acetylcholinesterase inhibitor)
- rivastigmine (parasympathomimetic) - also for Parkinson’s
- galantamine (cholinesterase inhibitor) - vascular origin
What is Huntington’s disease ?
Incurable, progressive, Neurodegenerative disorder presenting. Middle age
- often prodromal phase of mild symptoms (irritability, depression, incoordination)
- progresses to chorea, dementia +/- fits
- death ~15 years after diagnosis
Pathogenesis of huntingtons
- Atrophy and neuronal loss of striatum and cortex
- genetic basis: expansion of CAG repeat on chromosome 4
- no treatment prevents progression
Pathogenesis of CJD
- Prion protein (PrPSc), misfiled form of normal protein that can turn other proteins into prions
- increased PrPSc -> spongiform changes (tiny cavities) in brain
Signs of CJD
- progressive dementia
- focal CNS signs
- myoclonus
- depression
- eye signs: diplopia, supranuclear palsy, Hallucinations etc
What are the 8 signs of delirium ?
DELIRIUM: globally impaired cognition, awareness/consciousness
D- disordered thinking
E- euphoric, fearful, depressed or angry: labile mood
L- language impaired: reduced, repetitive, disruptive
I- illusions, delusions, hallucinations (tactile or visual)
R- reversal of sleep-wake cycle
I- inattention: distractable
U- unaware/disorientated
M- memory deficits
Causes of delirium
- systemic infection (pneumonia, UTI, malaria, wounds
- intracranial infection: encephalitis, meningitis
- drugs: opiates, sedatives, anticonvulsants, levodopa
- alcohol withdrawal
- metabolic: uraemic, liver failure etc
- hypoxia
- head injury
- epilsepsy
Investigations in delirium
- FBC, U&Es, LFT, blood glucose,
- ABG
- septic screen (urine dipstick, CXR, blood cultures)
- ECG
- malaria films
- LP
- CT/MRI
- EEG
What is somatisation
Multiple, recurrent and frequently changing physical symptoms usually present for several years with negative investigations
Which conditions is somatisation associated with ?
- IBS
- chronic pain
- post traumatic stress disorder
- antisocial personality disorder
Pathogenesis of somatisation ?
The somatising patient seems to seek the sick role, which affords relief from stressful or impossible interpersonal expectations (‘Primary gain’)
- in most societies this provides attention, caring and sometimes monetary reward (‘secondary gain’)
- this is not malingering as patient is unaware of process through which symptoms arise, cannot will them away and genuinely suffers from the symptoms
Presenting features of somatisation
- patients feelings and behaviours about symptoms are disproportionate or excessive
- life long history of ‘sickliness’
- combo if symptoms with and without organic causes
- stress worsens symptoms
- cardiac: palpitations, sob, chest pain
- GI: abdo pain, bloating, diarrhoea, vomiting
- MSK: back and joint pain
- neuro: headaches, dizziness, vision changes, headaches
- urogenital: low libido, dysmenorrhea, dysuria
Typical features pointing to somatisation for diagnosis
- multiple symptoms often in different organ systems
- vague symptoms exceeding objective findings
- chronic course
- psychiatric disorder e.g. depression, anxiety
- history of extensive diagnostic testing
- rejection of previous physicians