Parkinson's Flashcards

1
Q

what type of movement disorder is Parkinson’s?

A

akinetic rigid syndrome

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2
Q

types of parkinson’s related disease

A

drug induced parkinsonism
Parkinson’s disease
Parkinson’s plus disease

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3
Q

what are the cardinal features of parkinson’s?

A

rest tremor - disappears on movement
rigidity
bradykinesia - slow movements
postural instability

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4
Q

pathophysiology of parkinson’s

A

diminished/ loss of dopaminergic neurones in substantia nigra
lewi bodies form in brain - substantia nigra
downward movement control is lost as less dopamine is produced by dopaminergic neurones of substantia nigra

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5
Q

imaging for Parkinson’s

A

DaTscan

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6
Q

DaTscan findings

A

asymmetric
loss of tail on substantia nigra dopamine
minimal dopamine secretion

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7
Q

diagnosis of parkinson’s

A

clinical features
exclude other syndromes
DaT scan
trial L-dopa or apomorphine to see if it helps

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8
Q

apomorphine

A

quicker effect than L-dopa

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9
Q

How does L dopa work?

A

replaces what is lost

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10
Q

treatments for parkinson’s

A

Levodopa
dopamine agonists
surgery

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11
Q

dopamine agonists e.g.

A

apomorphine

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12
Q

risk of dopamine agonists

A

can cause dopamine dysregulation syndrome
changes behaviour
hypersexuality
gabbling addiction

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13
Q

levodopa

A

becomes less effective as disease progresses
resistance develops
symptoms then worsen
therapeutic zone can be very specific

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14
Q

too much levodopa

A

dyskinesia

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15
Q

surgery for parkinson’s

A

destructive lesion
chronic stimulation
reconstruction of lost circuitry

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16
Q

destructive lesions

A

create lesion in brain to treat the parkinson’s symptoms
use injections or gamma-knife
lesion in basal ganglia

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17
Q

chronic stimulation

A

electrode inserted into areas of the brain

deep brain stimulation into subthalamic nucleus

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18
Q

what are the risks of chronic stimulation/ deep brain stimulation

A

risk of temporary blindness due to proximity of optic nerve
risk of damage to swallowing areas
to avoid these risks electrodes are inserted while patient awake

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19
Q

reconstruction of host circuitry

A

stem cell transplant
differentiation into dopaminergic neurones
insert into basal ganglia

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20
Q

what drugs can cause parkinsonism?

A

antiemetics

antipsychotics

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21
Q

antiemetics that cause parkinsonism

A

cyclizine

metoclopramide

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22
Q

antipsychotics that cause parkinsonism

A

haloperidol
clozapine
deplete dopamine

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23
Q

what is parkinson’s plus syndrome?

A

parkinson’s features as well as additional features

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24
Q

examples of parkinson’s plus syndromes

A

PSP
MSA
Wilson’s disease
CBD

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25
PSP
progressive supranuclear palsy
26
PSP
``` parkinsonism supranuclear gaze palsy pseudobulbar palsy dystonic rigidity of neck and trunk dysarthria dementia poor response to L dopa midbrain degeneration ```
27
supranuclear gaze palsy
unable to look up or down voluntarily
28
pseudobulbar palsy
very extreme mood swing type behaviour
29
MSA
multiple system atrophy
30
multiple system atrophy symptoms
``` parkinsonism autonomic failure cerebellar degeneration - poor balance pyramidal signs - spastic paraparesis and weakness sighs for no reason sleep apnoea ```
31
multiple system atrophy pathogenesis
area affected around pons relay of all tracts is the area affected hot cross bun appearance on MRI of midbrain
32
treatment for MSA
``` no response to L dopa treatments often unlikely to be beneficial anticholinergics BP support elastic stockings bed head up fludrocortisone ```
33
mean age of onset of PD?
45-60 0.5-1% of over 60s 2nd most common neurodegenerative disease
34
risk factors for PD?
``` genetics pesticides/ herbicides pollution age men more at risk drugs ```
35
symptoms of PD?
``` tremor at rest - 4-7Hz rigidity bradykinesia bilateral signs no sensory loss power is normal shuffling steps gait stooped gait with reduce arm swinging and narrow base slow, monotonous and slurred speech plain face/ facial stare reduced blinking rate depression dementia hallucinations greasy and sweaty skin heartburn dribbling dysphagia weight loss constipation ```
36
investigations/ diagnosis
``` clinical MRI will be normal dopamine transporter imaging = unreliable and expensive handwriting anosmia violent dreams no lab tests DaT scan trial of levodopa/ apomorphine ```
37
lewy bodies
can be seen throughout the brain | often cause co-existing dementia
38
dopamine and ACh in PD
dopamine is normally inhibitory at corpus striatum normally dopamine inhibits ACh release in corpus striatum but in Parkinson's too much ACh is released there is cell death by excitotoxcity, oxidative stress and apoptosis
39
progression of PD
no remission usual course = 10-15 years doesn't directly cause death puts strain on the body, increasing susceptibility to infection progression is unique to each person and rate of progression is variable
40
what is the main cause of death in PD?
bronchopneumonia as a result of dysphagia
41
how many stages of PD are there?
``` 1 - mild symptoms 2 - worsening symptoms 3 - mid-stage 4 - severe and limiting symptoms 5 - advanced and debilitating ```
42
stage 1 of PD
tremor and unilateral movement symptoms | changes in posture, walking and facial expressions
43
stage 2 of PD
``` tremor rigidity bilateral movement symptoms walking problems poor posture able to live alone but daily tasks are challenging ```
44
stage 3 of PD
loss of balance bradykinesia falls more common impaired daily activities
45
stage 4of PS
able to stand unassisted but walked required | need support with daily activities and unable to live alone
46
stage 5 of PD
``` unable to stand or walk due to stiffness wheelchair needed or bed ridden constant nursing required hallucinations and delusions motor and non-motor symptoms ```
47
rating PD scales
Hoehn and yahr stages | unified parkinson's disease rating scale
48
Hoehn and yahr stages
monitor motor symptoms and progression
49
Unified parkinson's disease rating scale
accounts for motor and non-motor symptoms, mental functioning, mood and social interaction accounts for cognitive difficulties, ability to carry out daily activities and treatment complications
50
other causes of Parkinsonism/ differentials
``` alzheimers multi-infarct dementia repeated head injury drugs vascular events, orthostatic hypotension with atonic bladder, dementia, wilson's disease, apraxic gait parkinson's plus syndrome multi-system atrophy progressive supranuclear palsy ```
51
what drugs can cause parkinsonism?
neuroleptics | dopamine reducing drugs - dopamine antagonists
52
what are the treatments for PD?
Dopamine agonists L-dopa drugs that release dopamine MAO-B inhibitors
53
Dopamine agonists mechanism of action
bind to dopamine receptors and mimic the effects of dopamine
54
L dopa mechanism of action
dopamine precursor so increases the amount of dopamine in CNS - can cross BBB
55
MAO-B inhibitors
selective inhibition of monoamine oxidase B which metabolises dopamine therefore increasing dopamine levels in the brain
56
L-dopa downsides
efficacy decreases over time | on-off effect
57
side effects of L-dopa
``` nausea GI upset dyskinesia - unwanted movements psychosis impulse control disorders hypotension arrhythmia confusion disorientation insomnia nightmares ```
58
impulse control disorders
``` compulsive eating compulsive shopping hypersexuality punding pathological gambling ```
59
side effects of MAO-B inhibitors
postural hypotension atrial fibrillation can be very serious
60
anticholinergic side effects
``` dry mouth dizziness urinary retention anxiety confusion tachycardia hallucinations insomnia memory problems ```
61
contraindications for anticholinergics
urinary retention acute glaucoma GI obstruction prostate problems
62
psychological effects of PD
``` depression and anxiety are most common hallucinations memory problems dementia psychosis delusions impulse control disorders apathy sleep disorders panic attacks lonliness ```
63
what is apathy?
diminished motivation and goal directed behaviour
64
progressive supranuclear palsy symptoms
``` falls balance problems paralysis vertical gaze parkinsonism cognitive impairment progressive and varying course ```
65
age of onset of progressive supranuclear palsy
60-65 | 7 years survival on average
66
treatment for progressive supranuclear palsy
poorly responds to L-dopa
67
symptoms of multi-system atrophy
``` parkinsonism cerebellar problems autonomic problems - postural hypotension akinesia rigidity ```
68
treatment for multi-system atrophy
responds poorly to L-dopa
69
what is multi-system atrophy?
degenerative neurological disorder
70
symptoms of Wilson's disease
``` parkinsonism liver failure renal failure wide neurological problems parkinsonism chorea akinesia tremors rigidity personality and behavioural problems cognitive impairment ```
71
Wilson's disease age of onset
6-20
72
treatment of wilson's disease
Penicillamine | treat early and can be very well controlled
73
pathogenesis of wilson's disease
autosomal recessive condition | causes problems with copper metabolism so copper is deposited in the liver, basal ganglia, cornea and kidneys
74
what happens to the direct and indirect pathways in PD?
loss of activation of direct and loss of inhibition of indirect pathways