Dementia Flashcards
DSM-5 criteria (A)
Significant cognitive decline in 1 or more cognitive domain:
- Learning and memory
- Language
- Executive function
- Complex attention
- Perceptual-motor
- Social cognition
DSM-5 criteria (B)
The cognitive deficits interfere with independence in everyday activities.
DSM-5 criteria (C)
The cognitive deficits do not occur exclusively in the context of a delirium.
DSM-5 criteria (D)
The cognitive deficits are not better explained by another mental disorder.
Areas of manifestation of dementia
Cognitive
Psychological
Behavioural
Sleep
Physical
MMSE score for mild AD
20-24 (out of 30)
MMSE score for moderate AD
10-19 (out of 30)
MMSE score for severe AD
<10 (out of 30)
MMSE score for severe AD
Types of dementia
- AD
- Vascular dementia
- Lewy body dementia
- Frontotemporal dementia
- Mixed type
Modifiable risk factors
- Age (5-10% >65y/o, 50% >85y/o)
- Female
- Ethnicity: black, Hispanic
- Genetics: APOE*4
Non-modifiable risk factors
- HTN
- DM
- Binge drinking
- Smoking
- Limited physical activity
- Obesity
- Hearing loss
- Depression
Clinical evaluations
- Medical history (both patient and family/friend/caregiver)
- Functional deficits
- Cognitive deficits
- Absence of alternative conditions
- Labs (not routine)
- Imaging (adjunct)
Laboratory testing (rule out)
Thyroid & Vitamin B12
Structural brain imaging (AD)
Generalised or focal cortical atrophy, often asymmetrical
Structural brain imaging (vascular)
Brain infarcts or white matter lesion
Structural brain imaging (frontotemporal)
Frontal lobe or anterior temporal lbe atrophy
Structural brain imaging (others)
Brain mass (tumour), hydrocephalus
MoCA scoring (mild)
18-25
MoCA scoring (moderate)
10-17
MoCA scoring (severe)
<10
Pathophysiology of AD
- Senile plagues
- Neurofibillary tangles (NFTs)
- Cholinergic deficits
Major constituent of senile plaques
Aggregates of b-amyloid peptide
How is Ab peptides derived?
Cleavage of amyloid precursor proteins (APP) via action of b- and γ-secretases
What is the alternative pathway of Ab peptides?
a- and γ- secretases
Major constituent of NFTs
Hyper-phophorylated tau protein aggregates forming paired helical filaments (PHF)
What are tau?
Tubulin associated protein for microtubule stabilisation & intracellular transport
Goals of AD management
- Slow progression
- Disease modifying (not available)
- Delay institutionalisation
- Support & education for caregivers
- Manage behavioural problems
What are the commonly used anti-cholinesterase inhibitors?
- Donepezil
- Galantamine
- Rivastigamine
MOA of AIs
Inhibits acetylcholinesterase enzyme from breaking down EACh, increasing duration and level of EACh at the synaptic cleft for cholinergic neurotransmission
How long should AIs be titrated to reach target dose and minimise AEs?
4-8 weeks
Side effects of AIs
Cholinergic hyper activation: N?V, diarrhoea
Less common side effects of AIs
Muscle cramp
Bradycardia
Loss of appetite
Increased gastric juice secretion
Initial dose of Donepezil
5mg OD in the evening (oral)
5mg/day weekly (patch)
Usual range of Donepezil
5-10mg (mild-moderate)
10-23mg (moderate-severe)
Dosage adjustment - Donepezil
No adjustment required
Initial dose of Rivastigmine
1.5mg BD (oral)
4.6mg/day (patch)
Usual range of Rivastigmine
3-6mg OD (oral)
9.5-13.3 mg/day (patch)
Rivastigmine metabolism
Renal
Dosage adjustment - Rivastigmine
Renal, hepatic, low body weight - consider lower dose
Initial dose of Galantamine
4mg OD (oral)
8mg OM (ER)
Usual range of Galantamine
8-12mg BD (oral)
16-24mg OD (ER)
Dosage adjustment - Galantamine
Moderate renal/hepatic impairment: max daily = 16mg
Not recommended for severe renal/hepatic impairment
Efficacy monitoring of AIs
Day to day life improvement
Non-pharmacological 1
Cognitively stimulating activities (reading, games)
Non-pharmacological 2
Physical exercise (aerobic and anaerobic)
Non-pharmacological 3
Social interactions with others (family events)
Non-pharmacological 4
Healthy diet such as Mediterranean diet
Non-pharmacological 5
Adequate sleep (uninterrupted sleep and with sufficient number of hours)
Non-pharmacological 6
Proper personal hygiene (regular bathing)
Non-pharmacological 7
Safety, including inside the home and outside
Non-pharmacological 8
Medical and advanced care directives (designation of lasting power of attorney)
Non-pharmacological 9
Long term health care planning
Non-pharmacological 10
Financial planning
Non-pharmacological 11
Effective communication
Non-pharmacological 12
Psychological health (participating in personally meaningful activities such as playing music)
BPSD 1
Agitation & aggression
BPSD 2
Depression
BPSD 3
Anxiety
BPSD 4
Apathy
BPSD 5
Psychotic symptoms
BPSD 6
Wandering
BPSD 7
Nocturnal disruption