Ageing: AD, VD, LBD, FTD, PD, ET, MSA, PSP Flashcards
Alzheimers
-epidemiology
-genetic, environmental risk factors
-pathophysiology
MOST COMMON DEMENTIA
Genetic
-sporadic, late - APOE4
-inherited - APP, PSEN1, 2
-Downs
Environment
-brain/SC injury, CVA
-drugs, alcohol, vitamin deficiency, hypoglycemia
-HIV, HSV, syphilis
Pathophysiology
-cerebral atrophy, esp hypothalamus - wide sulci, narrow gyri, large ventricles
-extracellular AMYLOID PLAQUE, intracellular TAU TANGLES
Alzheimers
-presentation
-management specific to AD
-drugs to avoid
Gradual cognitive decline
-poor short term memory
-confusion, increased anxiety
Later
-agnosia, aphasia, apraxia, amnesia
-hallucinations, depression, delusions, disinhibition
NORMAL GAIT, POSTURE
Drug
1st line - cholinesterase inh
-donepezil, rivastigmine, galantamine
2nd line - NMDA ant
-memantine
Avoid antidepressants
Antipsychotics only to be used if risk to self/others
Vascular dementia
-epidemiology
-pathophysiology
-risk factors
2nd most common dementia
-CV risk factors damage brain => synergy with AD
Vascular risk factors
-stroke, TIA, AF, CVD
-HTN. DM, high cholesterol, smoking
Vascular dementia
-presentation
-investigations. diagnosis
Stepwise progression in cognitive decline
-focal neuro deficits
-attention, concentration
-memory, gait, speech, emotional disturbances
Diagnostic criteria
-presence of cognitive decline that interferes with ADLs, confirmed with clinical neuropsych exam
-CV disease - confirmed with neuro signs/brain imaging
-relationship between decline and CVD - onset of dementia within 3 months of stroke/abrupt or fluctuating stepwise decline
Vascular dementia
-management
-supportive
If comorbid with AD/LBD - same as AD
Vascular optimisation to slow progression
Tailored to individual
-cognitive stimulation programmes, music/arts therapy
-home adaptations
-physio for movement difficulties
-SALT input for speech and swallow
Differentials you want to rule out in cognitive decline
Drugs
-medication review (BZ, opioids, anticholinergic, antipsychotics, antidepressants, alcohol)
Endocrine
-hypothyroid, Addisons
Mental
-depression
Nutritional
-B12 (ataxia, memory loss, gait abnormalities)
-Thiamine (Wernicke’s enceph, Korsakoff psychosis)
Trauma
-SDH
Malignancy
-brain tumour
Infection
-syphilis
Lewy body dementia
-epidemiology
-pathophysiology
-presentation
-diagnosis, investigation
-management
3rd most common dementia
-ASYNUCLEIN in SNPC
Fluctuating cognitive impairment => Parkinsonian
-visual hallucinations
-falls, gait instability
-incontinence, constipation. RBD
Clinical diagnosis - confirm with DATSCAN
Management - same as AD
-avoid neuroleptics
Poor response to Parkinsonian meds
Frontotemporal dementia
-epidemiology
-pathophysiology
-types, presentation
Most common in U65
-atrophy of FTL, neurofibrillary tangles
50% - Behavioural variant - execuctive cognitive dysfunction
-early disinhibition, loss of empathy, impulsivity
-hyperorality, dietary change
-other cognitive areas
50% - Language variant
Semantic dementia - problems with matching names to objects
Non fluent aphasia - slow hesitant speech
-difficulty finding right words
-grammatical errors, difficulty understanding complex sentences
Frontotemporal dementia
-management
Do not use cholinesterase inh (memantine)
Pharmacological management when conservative measures have failed
-irritability - lorazepam
-compulsions - SSRI (citalopram)
Parkinsons Disease
-epidemiology
-genetic, encironmental risk factors
Men, 65+
Most idiopathic
Genetic - PARK1 gene overexpressed
Environmental - unclear
Degeneration of dopaminergic neurons in SNPC => Lewy body formation
Parkinsons Disease
-presentation (prediagnosis)
Constipation
Autonomic dysfunction => OH, urogenital dysfunction
Anosmia, visual changes
REM behaviour disorder
Depression+anxiety
Face-like mask
Micrographia
Parkinsons Disease
-presentation (early and late)
Early - classic unilateral triad
-bradykinesia - shuffling. difficulty initiating mv, reducing arm swing
-cogwheel rigidity
-pillrolling resting tremor - worse when stressed/tired, improves with voluntary mv
Advanced - on off dyskinesia
-flexed posture, dystonias, freezing
-gait instability, falls
-dysarthria, dysphagia
-dementia
-psychosis, hallucinations
Basal ganglia thalamocortical loop
D1
D2
How does dopamine relate to the resting tremor
D1 => activation promotes mv via direct path
D2 => activation inhibits mv inhibitions via indirect path
Low D => inactivity of D1, overactivity of D2
Increased ACh => resting tremor
Parkinsons Disease
-diagnosis, investigations
-differentials you want to rule out
CLinical diagnosis but can be confirmed by DATSCAN
Degenerative
-MSA, PSP
Reversible
-drug induced (metoclopramide, haloperidol, prochlormethazine)
-acute onset motor, rigidity and resting tremor not common => improved with procyclidine
-stroke, head trauma, encephalitis, Wilsons
Parkinsons Disease
-management
1st line if motor symptoms affecting QOL
-levopoda + carbidopa/benserazide
-progression => levepoda induced freezing/chorea or dystonia
Adjuncts
-dopamine agonists - bromocriptine, cabergoline, ropinrole
-MAOBinh - selegiline
-COMTinh - entecapone
-domperidone/ondasetron - antiemetic
