Neuro Exam 2 Flashcards
Parkinson’s Disease
-state of dopamine deficiency in brain
-functional imbalance between inhibitory dopamine + excitatory acetylcholine
–> loss of dopaminergic cells in substantia nigra + basal ganglia (requires 80% of nigral cell death before disease manifests clincally)
–> formation of lewy bodies
Bradykinesia (along with diagnosis criteria for PD)
(slowness + difficulty initiating voluntary movement)
2 of the following:
–> limb muscle rigidity (resistance to passive ROM)
–> resting tremor
–> pastural instability
Clinical presentation of PD
Primary: bradykinesia, postural instability, resting tremor, rigidity
Motor symptoms: dec dexterity, dysarthria, freezing at initiation of movement, slow turning
-autonomic symptoms: bladder + anal sphincter disturbances, constipation, diaphoresis
-mental status change: confusion, dementia, psychosis
PD meds to use to tx presence of symptoms + impairment
Rasagiline
If PD pt has tremor > 65 y/o
carb/levo
if PD pt has tremor and < 65
anticholinergic drug
If PD pt is < 65 and has bradykinesis or postural instability
dopamine agonist then anticholinergic
Anticholinergic meds in PD
-Benztropine & Trihexyphenidyl
–> use these in younger pts with tremor
–> SEs: mydriasis, dry mouth, fever, depressed mental state, flushed skin
Levodopa
gold standard! (precursor to dopamine)
SEs: dyskinesia, decreased effectiveness over time, psychiatric disturbances, nausea, hypotension, saliva sweat or urine discoloration, NMS w/ abrupt d/c
**always give with dopa!!
Carbidopa
-only purpose is to increase 1/2 life of levadopa!
**never use as mono-therapy, CI in pregnancy and lactation
Carbidopa/Levodopa (Sinemet)
-1:10 or 1:4 ratio
-Sinemet CR: dec in total “off” time and dec dosing frequency, can use supp IR along with CR
Inbrija
levodopa powder
-intermittent tx of “off” episodes in pts with PD treated w/ carb/levo
AEs: somnolence, hallucinations, dyskinesia, cough, nausea, upper tract infection
-CI in pts with asthma and COPD
Enracapone
-COMT inhibitors: prevents breakdown of L-dopa + extend effects of L-dopa
no effect in absence of L-dopa
SEs: may produce brown/orange urine
Tolcapone
COMT inhibitor
**do not use w/hepatic disease (rarely used)
Selegiline
MAO-Bs (dont have to worry about tyramine effects- decs breakdown of dopamine + dec free radical production)
–> has 3 active metabolites: reason why it has side effects
SEs: hypertensive crisis, serotonin syndrome, insomnia, jitteriness, hallucinations
Rasagiline
MAO-IB
-potentially disease modifying
SEs:
–> mono-therapy: headache, arthralgia, GI upset, falls
–> w/ levodopa: dyskinesia, GI upset, headaches, weight loss, arthralgia + orthostasis
Safinamide
MAO-IB
-Na and K channel blocker, dec glutamate release
indication: adjunctive to L-dopa for wearing off symptoms
AEs: dopaminergic, daytime somnolence, NMS symptoms, retinal pathology
CI in child-Pugh class C
Amantadine
-decreases rigidity, tremor, bradykinesia, L-dopa induced dyskinesia!!(only agent we can add on to dec this symptom)
-AEs: orthostatic hypotension, hallucinations, sedation, anticholinergic AEs, LIVEDO RETICULANS (skin molting)
Dopamine agonists
-may be used as mono therapy –> reduced risk of developing motor complications
-used as adjunctive agent: to get better control of symptoms w/ L-dopa
AEs: N/V, vivid dreams, pedal edema, impulsive behaviors, psychosis
What are the dopamine agonists used in PD?
-pramipexole (most common)
-ropinirole
-bromocriptine
-cabergoline
-rotigotine (transdermal patch)
-apomorphine (refectory pts- used as needed for off episodes, pretreat with antiemetic)
managing “wearing-off” or “on-off” response in PD
-increase frequency, switch to CR, adjunctive DA ag/MAOI/COMT/amantadine
managing “off, no-on” response in PD
delayed stomach emptying/dec absorption: inc dose/freq/water
Managing delayed onset response in PD
-empty stomach (no water or protein)
-switch off CR or add IR
managing peak-effect dyskinesia in PD
-dec dose
-inc frequency
-add amantadine
-use CR simemet, DA ag
managing dystonia in PD
-take early am
-CR at HS
-DA ag
-add baclofen or botox
managing freezing in PD
-inc dose
-add DA ag
-gait modification/physical therapy
what medication is used to treat dementia and cog impairment in PD?
Rivastigmine
How is psychosis treated in PD?
1) d.c meds with highest risk:benefit, anticholinergics, D/C amentadine, selegiline, DA ag + decrease L-dopa
2) consider adding atypical antipsychotic drug
what drugs are used to treat psychosis in PD?
-quetipaine
-clonazipine
-Pimavanserin tartrate indicated for hallucinations & delusions in PDP
BBW: inc death in elderly with dementia
AEs: QT prolongation, peripheral edema, nausea, confusion
Dementia:
a syndrome characterized by progressive decline of intellectual ability from a previously attained level
Alzheimers Disease
-progressive, neurodegenerative disease affecting cognition, behavior (most common form of dementia)
-formation of beta-amyloid plaques and neurofibrillary tangles
Acetylcholinesterase inhibitors (for AD tx)
-blocks acetylcholinesterase, block metabolism of Ach
AEs (SLUDGE), sialorrhea, lacrimation, urination, defecation, GI, emesis
Donepezil
(ACHI)
-indicated for mild to moderate AD
AEs: symptomatic bradycardia can occur, rare cases of rhabdomyolysis and/or NMS
Rivastigmine
(ACHI)
-indicated for mild-severe AD and mild-moderate parkinsons dementia
AEs: GI*** (slow titration), taking with food: incs AUC, dec GI upset
(patch) –> indicated for mild-severe AD
Galantamine
(ACHI)
-indicated for mild to moderate AD
-should NOT be used in pts w/ end-stage renal disease or severe hepatic impairments
Memantine
-NMDA receptor antagonist
-approved for moderate to severe stages of AD
*clearance is sig reduced by alkaline urine
**use w/ caution in pts with hx of seizures and cardio disease
Namzaric (memantine ER + Donepezil)
-take in the evening w/ or w/o food
*pt must be stable on donepezil 10 mg before starting this combo
TX for behavior issues in AD
antidepressants, anxiolytics, antipsychotics, antiepiliptic drugs
antipsychotics in AD
-risperidone (best bish), quetiapine, olanzapine, aripiprazole
–> BBW: elderly pts w/ dementia-related psychosis treated with antipsychotics are at an increased risk of death
SNRI FDA approved for GAD
duloxetine, venlafaxine
SSRI FDA approved for GAD
escitalopram, paroxetine