Parkinson's Flashcards

1
Q

Pathophysiology of Parkinson’s Disease

A
  • dopamine deficiency in brain
  • imbalance between inhibitory dopamine and excitatory acetylcholine
  • loss of dopaminergic cells
  • formation of Lewy Bodies
  • required 30-80% of nigral cell death before disease manifests clinically
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2
Q

Diagnostic Criteria for Parkinson’s

A

Bradykinesia (slowness and difficulty initiating voluntary movement)

+ at least one of the following
- limb muscle rigidity
- resting tremor
- postural instability

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3
Q

Levodopa

A

MOA: precursor to dopamine, crosses BBB

Dosing: 200-300 mg/day -> inc by 100mg/wk -> 800-1000mg/day

CI: Breast feeding, closed angle glaucoma, melanoma

DDI: dopamine antagonists (metoclopramide and APS), MAOIs, high protein intake, pyridoxine

ADE: dyskinesia, On-off, decreased effectiveness over time, psych disturbances, vivid dreams, nausea, ortho hypo, saliva/sweat/urine discoloration, NMS w/ abrupt dc

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4
Q

Carbidopa

A

MOA: inhibit breakdown of levodopa in the periphery (increases both absorption and T1/2)

Dosing: 70-100mg/day

CI: pregnancy / lactation

ADE

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5
Q

Carbidopa

A

MOA: inhibit breakdown of levodopa in the periphery (increases both absorption and T1/2)

Dosing: 70-100mg/day

CI: pregnancy / lactation

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6
Q

Sinemet CR

A

Carbidopa / Levodopa
25/ 100 mg
50 / 200 mg

less bioavailable than IR (consider giving 25% more per day)

pats complain of slowed onset

when switching from IR to CR start with 50% reduction in frequency

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7
Q

Inbrija

A

Levodopa powder for inhalation
for intermittent treatment of OFF episodes

ADE: somnolence, hallucinations, dyskinesia, COUGH, nausea, URTI, discolored sputum

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8
Q

Tolcapone (Tasmar)

A

MOA: reversible selective inhibitor of COMT -> prevents breakdown of L-dopa

Dosing: 100mg TID

CI: hepatic disease

DDI: nonselective MAOI, other drugs metabolized by COMT (apomorphine, bitolterol, dobutamine, dopamine, epinephrine, isoetharine, isoproterenol, methyldopa, norepinephrine)

ADE: hepatocellular injury, similar ADE to levodopa

Generally Entacapone is preferred over Tolcapone

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9
Q

Entacapone (Comtan)

A

MOA: reversible selective inhibitor of COMT -> prevents breakdown of L-dopa

Dosing: 200mg with each dose of levodopa/carbidopa

DDI: nonselective MAOI, other drugs metabolized by COMT (apomorphine, bitolterol, dobutamine, dopamine, epinephrine, isoetharine, isoproterenol, methyldopa, norepinephrine)

ADE: similar to levodopa + brown/orange urine

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10
Q

Stalevo

A

Carbidopa / Levodopa / Entacapone
12.5 / 50 / 200
25 / 100 / 200
50 / 150 / 200

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11
Q

Selegiline (Eldepryl, Zelapar [transbuccal])

A

MOA: noncompetitive, selective MAO-Bi -> decrease breakdown of dopamine
- increase L-dopa peak, can dec L- dopa dose up to 50%

Dosing:
-Eldepryl (PO): 5mg QD-BID
-Zelapar (dissolving tablet): 1.25 mg QD - 2.5 mg QD after 6 weeks. no food or drink 5 minutes before/after

DDI: nonspecific MAOI, TCA, SSRI, SNRI, DXM, tyramine containing foods at doses > 10 mg, sympathomimetics

ADE: CNS, GI, hypertensive crisis, serotonin syndrome, insomnia, jitteriness HA

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12
Q

Rasagiline (Azilect)

A

MOA: noncompetitive, selective MAO-Bi -> decrease breakdown of dopamine
- decrease in free radicals -> may be disease modifying

Dosing: 0.5 mg QD w/ levodopa
- 1 mg as monotherapy

DDI: nonspecific MAOI (2 week washout), TCA, fluoxetine (5 week washout), sympathomimetics

ADE:
-monotherapy: HA, arthralgia, GI upset, falls
- w/ levodopa: dyskinesia, GI upset, HA, weight loss, arthralgia, orthostasis (during first 2 months)

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13
Q

Safinamide (Xadago)

A

MOA: selective MAOBi
- Na and K channel blocker, dec glutamate release
- adjunct to L-dopa for wearing off symptoms

Dosing: 50mg PO QD -> 2 weeks -> inc to 100mg QD if needed

CI: Child-Pugh class C, do not exceed dose of 50mg in hepatic impairment

ADE: dyskinesia, hallucinations/psychosis, impulse control, behavior change, nausea, daytime somnolence, NMS in withdrawal, retinal pathology

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14
Q

Amantadine (Symmetrel, Gocovri, Osmolex ER)

A

MOA: not understood, decreases rigidity, tremor, bradykinesia, L-dopa induced dyskinesia

Dose:
-Symmetrel IR: 300 mg/day PO div
-Gocovri ER: 137 mg PO QD 1w -> 274 mg PO QD
- Osmolex ER: 129 mg PO QD 1w -> 322 mg PO QD

CI: CHF, orthostatic hypotension, peripheral edema

DDI: Flumist, Quinine/Quiidine, HCTZ, triamterene

ADE: orthostatic hypotension, hallucinations, sedation, anticholinergic AEs, livedo reticularis - mottling of skin with LE edema (resolves with dc), NMS with abrupt disruption

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15
Q

Pramipexole (Mirapex)

A

MOA: Dopamine agonist

Dosing:
-IR 0.125mg TID -> MDD 1.5mg TID
-ER 0.375 mg QD -> MD 4.5 mg QD

PK: smoking may decrease levels (induces CYP1A2)

CI: abrupt discontinuation, hepatic disease

ADE: edema, impulsivity, psychosis, N/V, orthostasis, sedation, vivid dreams, pedal edema, plum fibrosis (Ergots), cardiac valvopathy

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16
Q

Ropinirole (Requip)

A

MOA: Dopamine agonist

PK: smoking may decrease levels (CYP1A2)

Dosing:
IR 0.25 mg TID -> MDD 24mg
ER 2mg QD -> MDD 24mg

CI: abrupt discontinuation, hepatic disease

ADE: edema, impulsivity, psychosis, N/V, orthostasis, sedation, vivid dreams, pedal edema, plum fibrosis (Ergots), cardiac valvopathy

17
Q

Bromocriptine (Parlodel)

A

MOA: dopamine agonist

CI: breast feeding, eclampsia, ergot alkaloid hypersensitivity, uncontrolled HTN

DDI: antihypertensive agents, erythromycin

ADE: CNS, GI, pulmonary fibrosis (chest radiograph at BL, once yearly)

18
Q

Rotigotine (Neupro)

A

MOA: dopamine agonist, transdermal patch

Dosing: 2mg/24h -> inc weekly by 2mg/24h up to 6mg
-4mg minimum effective dose

DDI: dopamine antagonists (APS and metoclopramide)

ADE: application site reaction, CNS, GI, peripheral edema

19
Q

Apomorphine (Apokyn)

A

MOA: stimulates postsynaptic D2 type receptors
- used as needed or for off episodes

Dosing: 2mg SC test dose under medical supervision
-monitor BP pre-dose, 20 min, 40min, 60min
-may increase dose by 1mg every few days as needed up to 6mg
-pretreat with antiemetic (3 days before, continue for 2 months and reassess) -NOT 5HT3 antagonists or antidopaminergic

ADE: N/V dizziness, somnolence, chest pain/pressure, dyskinesia, falls, yawning, rhinorrhea

20
Q

Non-pharm treatments for Parkinson’s

A

surgery (deep brain stimulation)
physical therapy and exercise
nutrition
- fluids
- fiber
- omega 3 fatty acids
- occupational therapy and fall precautions

21
Q

Management of wearing off syndrome

A

increase frq
switch to CR (decreased frq may require IR morning dose)
adjunctive DA (MAOI/COMT/Amantadine)

22
Q

Management of OFF NO ON

A

delayed stomach emptying / decreased absorption?
- inc dose
- inc frq
- take on empty stomach
- use ODT

advanced disease > APO SQ

23
Q

Management of delayed onset

A

empty stomach
water
avoid protein
if CR: consider switching off CR or adding IR

24
Q

Management of peak effect dyskinesia

A

dec dose
inc frq
add amantadine
use CR Sinemet
add DA agonist

25
Management of dystonia
add early morning dose CR at HS DA agonist Baclofen Botox
26
Management of freezing
inc dose DA agonist gait modification physical therapy
27
Management of depression in parkinson's
pramipexole SSRIs venlafaxine
28
Management of dementia in parkinson's
rivastigmine
29
Management of insomnia in parkinson's
eszopiclone melatonin
30
Management of excessive daytime sleepiness
modafanil
31
Management of orthostatic hypotension
fludrocortisone midodrine droxidopa
32
Management of sexual dysfunction
sildenafil
33
Management of constipation
PEG probiotics lubiprostone
34
Management of urinary frequency
solifenacin
35
Management of drooling
glycopyrrolate botox
36
Management of psychosis
evaluate for other causes (pathological, drug) simplify regimen consider atypical antipsychotics - Quetiapine - Clozapine - Pimavanserin tartrate (Nuplazid)