Exam 2 Flashcards
Parkinsonism
any disorder presenting with classic signs and symptoms; usually secondary to some other factor; infection, drugs, toxins
Parkinson’s disease
idiopathic form of parkinsonism
pathophysiologic features of parkinson’s
- Loss of dopaminergic cells in substantia nigra and basal ganglia
- formation of lewy bodies in remainin SNc neurons and other parts of the brain: medulla, locus coeruleus, raphe nuclei, olfactory bulb
UK Parkinson’s disease society brain bank diagnosis criteria
Bradykinesia (slowness and difficulty initiating voluntary movement) and at leas 1 of the following:
-limb muscle rigidity (resistance to passive ROM)
-resting tremor
-postural instability
clinical presentation of parkinsons
primary: bradykinesia, postural instability, resting tremor, rigidity
motor symptoms: decreased dexterity, dysarthria, freezing at initiation of movement, slow turning
autonomic symptoms: bladder & anal sphincter disturbances, constipation, diaphoresis
mental status changes: confusion, dementia, psychosis
on vs off
on= good movement
off= poor movement
approaches to pharm treatment in PD
-increase endogenous dopamine
-decrease cholinergic activity
-activity dopamine receptors using synthetic agonists
-block adenosine A2A receptor activity
anticholinergics PD
Benztropine (Cogentin), Trihexyphenidyl (Artane)
MOA: antimuscarinic
Side effects: possible link to cognitive impairment and decline, anti-SLUDGE
drugs that increase endogenous dopamine
levodopa, carbidopa, encaptone, tolcapone, opicapone, selegiline, rasagiline, safinamide, amantadine
levodopa
gold standard
MOA: precursor to dopamine, crosses BBB
CI: breast-feeding, closed angle glaucoma, melanoma
Side effects: dyskinesia, on-off phenomena, decreased effectiveness over time, psychiatric disturbances, vivid dreams, GI effects, orthostatic hypotension, saliva, sweat, or urine discoloration, NMS w abrupt d/c
DDI: dopamine antagonists, non-selective MAOIs, high protein intake, iron salts, pyridoxine
carbidopa
MOA: noncompetitive dopa decarboxylase inhibitor: inhibits peripheral L-Dopa metabolism, increase both absorption and half life, no over pharmacodynamic actions. never used as monotherapy without levodopa
CI: pregnancy, lactation
Maintain doses at least 70-100 mg/day
Sinemet (caridopa/levodopa) CR
decrease in total “off” time, decrease dosing frequency, decreased bioavailability compared to IR
*delayed onset of effect (esp. when taken in AM)
switching from Sinemet IR to CR
start with 50% reduction in frequency
consider giving 25% more CR per day due to decreased bioavailability
Duopa
Carbidopa/Levodopa intestinal gel
infused through wearable pump in “PEG-J” tube
Most often used in patients with advanced PD (significant off time and/or dyskinesia)
*risk for infection
Inbrija
Levodopa powder for inhalation
Indication: intermittent treatment of OFF episodes in patients with Parkinson’s disease treated with carbidopa/levodopa (not a replacement for PO)
Side effects: somnoolence, hallucinations dyskinesia, cough, nausea, upper respiratory tract infection, and sputum discolored
CI: MAOI (nonselective) use within 2 weeks
Not recommended in patients with asthma, COPD, or other chronic underlying lung disease
COMT inhibitors
*Tolcapone, Entacapone, Opicapone
MOA: reversible, selective inhibitor of COMT: prevents breakdown of L-Dopa
NO effect in absence of L-dopa
DDIs: drugs metabolized by COMT, non-selective MAOIs
Entacapone (Comtan)
shorter half life for COMT inhibitors
Dose: give 200 mg w each dose of levodopa/carbidopa (up to 8 times daily)
Side effects: similar to levodopa, brown/orange urine
Stalevo (carbidopa/levodopa/entacapone)
Tolcapone (Tasmar)
COMT inhibitor
CI: hepatic disease (tolcapone-induced hepatocellular injury)
Side effects: rarely used today due to risk of hepatocellular injury (increased LFT’s), delayed onset diarrhea
Dose: 100mg TID
Opicapone (Ongentys)
decreased absorption with moderate-fat/calorie meal
Once-daily dosing: 50 mg QHS; do not eat for 1 hour before and at least 1 hour after dose
CI: use if nonselective MAOIs; phenochromocytoma, paraganglioma, or other catecholamine secreting neoplasm
Use in caution in patients with mild to moderate hepatic impairment; avoid use in severe impairment
MAOIs (selegiline, rasagiline, safinamide)
MOA: noncompetitive, selective antagonists of monoamine oxidase type B (MAO-B). This decreases breakdown of dopamine. Decrease free radical production (disease-modifying)
Mono or adjunctive therapy
Selegiline [Eldepryl, Zelapar (transbuccal)]
Labeled indication: adjunctive therapy only (can also be used mono in early PD)
Eldepryl (PO tab): 5 mg qd-bid
Zelapar (dissolving tablet): 1.25 mg QD- 2.5 mg QD after 6 weeks. No food or drink 5 mins before/after
CI: no absolute! dementia, severe psychosis, concomitant use of meperidine, tramadol, methadone, propoxyphene
Side effects: CNS, GI, hypertensive crisis, serotonin syndrome, insomnia, jitteriness, headache, irritation of buccal mucosa (zelapar)
Amantadine (Symmetrel, Gocovri, Osmolex ER)
MOA: somewhat poorly understood. decrease rigidity, tremor, bradykinesia, L-dopa induced dyskinesia
Precautions: Pts with CHF, orthostatic hypotension, or peripheral edema
AEs: orthostatic hypotension, falls, hallucinations, sedation (or insomnia), anticholinergic AEs, livedo reticularis (mottling of skin with LE edema), NMS with abrupt discontinuation
DIs: flumist (LAIV), Quinine/quinidine, HCTZ and triamterene
Rasagiline (Azilect)
Potentially disease modifying
Dose: 0.5 mg QD w levodopa, 1 mg as monotherapy
Side effects: monotherapy (headache, arthralgia, GI upset, falls) with levodopa (dyskinesia, GI upset, headaches, weight loss, arthralgia, and orthostasis) orthostasis is most common during the first two months of treatment
CI: meperidine, tramadol, methadone, propoxyphene, dextromethorphan, St. johns wort, mirtazapine, cyclobenzaprine, vasoconstrictors
Safinamide (Xadago)
MOA: selective MAOB-I. Na and K channel blocker, decrease glutamate release
Indication: adjunctive to L-Dopa for wearing off
Dose: Start with 50 mg PO QD; after 2 weeks, inc to 100 mg QD if needed
CI: Child-Pugh Class C
Side effecs: dopaminergic, daytime somnolence, withdrawal-emergent NMS-like syndrome, retinal pathology
Pramipexole (Mirapex)
MOA: D2 and D3 dopamine agonist
DIs: inhibitor of renal tubular secretion (cimetidine)
Dose: IR 0.125 mg TID; titrate to MDD of 1.5 mg TID
ER: 0.375 mg QD; titrate to MDD of 4.5 mg QD
Dopamine agonists
May be used as monotherapy
-reduced risk of developing motor complications when used as monotherapy compared to L-Dopa
Used as adjunctive agents in case of deterioration in response to L-Dopa
-fluctuations in L-Dopa response
-unable to tolerate increased doses of L-dopa
Non-motor side effects are more frequent compared to levodopa, especially in older or more frail patients
-impulsive behaviors, psychosis, n/v, vivid dreams, daytime sedation, orthostatic hypotension
Ropinirole (Requip)
MOA: D2 and D3 dopamine agonist
IR: 0.25 mg TID; titrate to MDD of 24 mg
XL: 2 mg QD; titrate to MDD of 24 mg
CI: abrupt discontinuation, hepatic disease
DIS: inhibitors of Cyp 1A2 (cimetidine, siprofloxacin, clarithromycin, diltiazem, enoxacin, erythromycin, fluvoxamine, mexiletine, norfloxacin, omeprazole, ritonavir and troleandomycin). Inducers (carbamazepine, phenobarbital, phenytoin, and rifampin, cigarette smoking)
Rotigotine (Neupro) Transdermal Patch
MOA: D1 and D2 and D3 agonist (primarily D2)
Precautions: heath, MRI, allergic-type reactions
Side effects: CNS, GI peripheral edema, application site reaction
DI: dopamine antagonists, such as antipsychotics or metoclopramide
Dosage: start at 2 mg/24hr, increase weekly by 2 mg/24hr up to 6 mg. 4 mg = minimum effective dose
Apomorphine (Apokyn)
Used in advanced PD for off episodes
MOA: stimulates postsynaptic D2 type receptors
2mg SC test dose under medical supervision
Pre-treat with antiemetic (3 days before, continue for 2 months and reassess) - not 5HT3 antagonists or antidopaminergic
AEs: N/V, dizziness, somnolence, chest pain/pressure, dyskinesia, falls, yawning, rhinorrhea
CI: 5HT3 antagonists (increase hypotensive effects)
DDI: QT prolonging drugs may have additive effects, dopamine antagonists may decrease effectiveness
Istradefylline (Nourianz)
Used for treatment of PD in combination with levodopa/carbidopa, in adult patients experiencing “off”
MOA: adenosine A2A receptor antagonist
Dose: 20 mg PO QAM; may further increase dose based on response and tolerability to a maximum dose of 40 mg once daily (adjust dose for smoking)
AEs: dyskinesia, insomnia, hallucinations, dizziness
DDIs: avoid use with strong CYP3A4 inducers
Non-pharmacologic PD treatments
Surgery
Physical therapy and exercise
Nutrition
Occupational therapy and fall precautions
Approach to psychosis in PD
- Evaluate hypoxemia, infection, electrolyte disturbance
- Simplify regimen - D/C meds with highest risk:benefit
*anticholinergics
*taper and D/C amantadine (abrupt withdrawal ca cause delirium)
*Selegiline
*Taper and D?C DA agonists
*Consider dec L-Dopa (end of day) and D/C COMT - Consider atypical antipsychotic drugs
*quetipine, clozapine, pimavanserin tartrate
what is MS
a chronic autoimmune disease that impairs the nerves ability to send electrical impulses. Inflammation and immune activity include T and B lymphocytes, macrophages, destructive cytokines, antibodies and complement, results in demyelination and damage to axons
MS symptoms
muscle weakness
blurry + double vision
unsteady gait/ balance issues
pain/ paresthesias
emotional/ cognitive disturbances
fatigue
sexual dysfunction
speech
swallowing
abnormal sensations
sensitivity to heat
bladder and bowel problems
MS diagnosis
At least 2 documented clinical exacerbations separated by time and space as well as 2 distinct MRI lesions separated by time and space.
Dissemination in time
simultaneous presence of gadolinium enhancing lesions and non-enhancing lesions or a new lesion on a follow-up MRI when compared to a previous MRI
Dissemination in space
distinctly different anatomical lesions on imaging occurring in areas known to be affected by MS
PPMS diagnosis
after one year of disease progression and if the patient meets 2 of the following criteria: DIS in the brain, DIS within the spinal cord and/or positive CSF
CIS diagnosis
after 1 exacerbation and 1 lesion while the clinician awaits a second exacerbation and lesion to be able to make the diagnosis of MS
Relapsing-remitting MS (RRMS)
most common form of MS
patients experience worsening of pre-existing symptoms or onset of new symptoms for periods of greater than 48 hours without concomitant fever, known as relapse, flare-ups, or exacerbations of MS
Contrasted by symptom free periods known as remissions
Secondary Progressive MS (SPMS)
A progression of RRMS
Disease course in steadily progressing
Can present with or without clear cut relapses
Primary Progressive MS (PPMS)
Disease course is characterized by a steady decline, without clear cut relapses
Progressive relapsing MS (PRMS)
Steady disease progression in addition to clear cut periods of exacerbations of MS
treating an acute severe MS attack
corticosteriods
methylprednisone (Solumedrol) 1g IV for 3-5 days followed by prednisone
H2 blocker/PPI for ulcer prophylaxis
Monitor blood glucose and watch for infection
Corticotropin
Acthar gel
Interferon beta
MOA= specific interferon-induced proteins and mechanisms by which interferon beta exerts its effects in MS have not been fully defined
Indication: relapsing forms including clinically isolated syndrome, RRMS and active SPMS
Avonex (interferon beta-1a)
IM injection given once weekly
Dose: 30 mcg
To decrease flu-like symptoms, may initiate once weekly dosing with 7.5 mcg IM (week 1) then increase dose in increments of 7.5 mcg IM once weekly (weeks 2-4) up to recommended dose
Pregnancy category C
Rebif (interferon beta-1a)
SQ injection gives 3x a week
Dose: 22 or 44 mcg (gradually titrate)
Pregnancy category C
Plegridy (interferon beta-1a)
SQ injection given every 14 day
Pregnancy category C
Pegylated interferon
Betaseron, Extavia (interferon beta-1b)
subcutaneous injection given every other day
titrate over 6 weeks
pregnancy category C
Interferon beta side effects
FLU LIKE SYMPTOMS
-pre-medicate before injection and following day with ibuprofen or acetaminophen
injection site rxn
depression
myalgia
arthralgia
asthenia
malaise
diaphoresis
myasthenia
abdominal pain
Glatiramer acetate (Copazone, Glatopa)
MOA= not fully known
SQ injection given QD
Pregnancy category B
Indication: relapsing forms including CIS, RRMS, and active SPMS
Glatiramer acetate side effects
INJECTION SITE RXN
transient flushing
vasodilation
chest tightness/pain
asthenia
N/V
pain
arthralgia
anxiety
palpitations
dyspnea
constriction of the throat