Neuro Exam 3 Flashcards
Pathophysiology of Parkinson Disease
Too little dopamine and too much acetlycholine
Therapeutic goal of Parkinsons
Provide symptomatic relief, does not delay the progression
Long term use of levodopa/carbidopa (Sinamet) can lead to______.
Dyskinesias, typically 80% of the users of the drug will experience this right after optimal dosage has been acheived
What are “off times associated with Levadopa/Carbidopa?
Periods where there is a complete loss of symptom relief
Adverse effects associated with Levodopa/Carbidopa
N/V, Dysrhythmias, postural hypotension, psychosis and dyskinesias
Levodopa purpose in the pill
Crosses the BBB and then can convert into dopamine
Purpose of Carbidopa in the pill
Carbidopa is the car that ensures levodopa gets driven past the BBB (ensures its is not broken down in the intestines/periphery).
Prior to giving this drug for parkinsons I will assess _____
Motor symptoms
Drugs that I shouldn’t take with Parkinson drug? (1 Hard NO)
Anticholinergic drugs, Selective MAO-B inhibitors
Hard NO- MAO Inhibitors
Take levodopa with ____ but avoid _____, when taking the drug, why?
food, high protein meals It can alter the absorption
Entacapone and Selegilline are use for what
The “off times” associated with taking Levadopa
Amantadine can be taken for
levodopa-induced movement disorders
Educate patient on this drug to except it to work in this time frame, be sure to check ____ and monitor urine for this adverse sign
weeks to months to work
skin assessment- can affect malignant melanoma
Darkened urine and sweat (harmless effect)
Why would I prescribe someone Pramipexole? (Mirapex)
It can be used as 1st line therapy in early stages of Parkinson (less side affects)
Also used with levadopa/carbidopa, lowers dose for Sinamet- less side affects
Also used for restless leg syndrome
MOA of Mirapex-Pramipexole
Direct activation of dopamine receptors in the striatum
Adverse effects of Pramipexole (Mirapex), same as Levadopa plus 2 funky ones
Nausea, diskinesia, postural hypotension, hallucinations
Sleep attacks and impulse controls (gambling, shopping, binge eating, etc)
Cautious giving Levodopa/Carbidopa to patients with ____ and _____
cardiac disease and psychiatric disorders
Prior to giving Mirapex im assessing
motor symptoms
Cautious to give Mirapex to (3)
older adults
Psych disorders
Kidney dysfunction
Selegiline will be given for what
MAO-B inhibitor to prevent dopamine breakdown- 1st line drug to decrease “off times”
Entacapone taken to do what
COMT inhibitor to prevent early breakdown of Levodopa in the peripheral tissues and intestines.
Amantadine Use and MOA
Only Drug recommended for diskinesias
Works by promoting release of Dopamine from remaining dopamine neurons, may block reuptake
Take mirapex with food or on empty stomach?
Food to reduce nausea and vomiting
Donepezil brand name
Aricept
Donepezil (aricept) use
Moderate to severe AD
MOA of Aricept
Prevent the breakdown of Aceylcholine by acetlycholinesterase and thereby increasing the availability of acetylcholine at cholinergic synapse
Severe effects of Aricept
Withdrawal syndrome
Prolonged Qt interval or heart block
Assess what prior to giving Donepezil
Mental status symptoms
Caution use of Donepezil in patients with (4)
Asthma or COPD
History of PUD
Urinary retention/obstruction
Since common side affects of Aricept are nausea and vomiting, patients can do this to reduce these symptoms
Take with food
Im administering you Donepezil Aricept I want to be sure to let you know that
Nausea and vomiting is common, take it with food to help, weight loss might occur but it will get better over time.
DO NOT DO THIS WHEN TAKING ARICEPT
Don’t stop medication suddenly, withdrawal symptoms include agitation, crying, and hallucinations
Memantine prescribed for
Moderate to severe AD
Memantine brand name
Namenda
Namenda is what type of drug
Neuronal receptor blocker
In lehman terms what does Cholinesterase inhibitors do for alzheimers disease
Prevent clearing of acetylcholine in junction, making more readily available
MOA of Memantine (Namenda) for alzheimers
In alzheimers, nerve cells are damaged causing too much glutamate to be produced which leads to more and more calcium being released into nerve cell- furthering cellular injury.
Memantine controls the influx of calcium, limiting the degree of damage
How to taper off multiple seizure drugs?
Taper off each individually and discontinue, one at a time
Pharmacologic management of Anti-eleptic drugs is highly _____
Individualized for each patient
Monitor what for AEDs
Monitor plasma drug levels due to tight therapeutic range
What do I wear if I am prone to seizures
Medic alert bracelet
What would a couple want to know about AEDs if one of them is taking the drug
Eight AEDs make oral contraceptives less effective and four of them can cause harm to a fetus
All AEDs, assess what
Type of seizure and how often
How do I get off AEDs
Withdraw slowly and sequentially- can lead to status epilepticus
Eval/Intervention/Education for patients on AEDS (4)
CNS depression
Signs that may preceded suicidal behavior
if pregnant take folic acid
Don’t stop suddenly
Difference between traditional and newer AEDs
Traditional AEDs are obviously more well established
Pharmacokinetics: Often complex in comparison to newer
Drug interactions: Are extensive
Safety in Pregnancy: Less safe
Cost: Less expensive in comparison to newer
The newer drugs are still figuring out their therapeutic niche
Phenytoin brand name
Dilantin
MOA of Dilantin
Delays the influx of sodium ions in neurons @ synaptic junction, consequently slowing the spread of abnormal nerve firing
Use of Dilantin
Treat all forms of epilepsy except for absent seizures
Phenytoin (Dilantin) Adverse reaction
CNS Issues- directly related to high doses
Morbilliform rash- evolve into Steven Johnson Syndrome
Teratogen
Purple Glove syndrome- Ischemic injury- due to very hard on blood vessels
Gingival hyperplasia
Hypotension and dysrhythmia with IV administration
MAR for Phenytoin (3)
Oral contraceptives, Warfarin, CNS Depressants
PMH for Dilantin
Sinus bradycardia or 2nd/3rd degree block
PO Dilantin
Take with food to avoid gastric upset
IV administration bewares of Dilantin
NEVER piggyback with dextrose solutions
Utilize a large vein with a large bore needle
There is significant extravasation risk, where the drug can leak out into the surrounding tissue
Toxicity S/S of Dilantin
Excessive sedation, diplopia, nystagmus
Can I go cold turkey on Dilantin If I decide its not working for me
No
What two teaching points could I include for patient taking Dilantin
Good oral hygiene for gingival hyperplasia and .5mg of folic acid daily
Brand name for Carbamazepine
Tegretol
Tegretol used for what
Seizures
Serious adverse effects of this Tegretol
Bone marrow suppression (Anemia, infection, bleeds)
Hypo-osmolarity and hyponatremia (increased ADH release)
Valproic Acid brand name
Depakote
What is Depakote used for
broad spectrum AED
Serious adverse of Depakote
Hepatotoxicity, pancreatitis, Teratogenic Effects
Avoid giving Valproic Acid to who?
Children less than 2 years of age and those individuals with liver issues
All barbiturates end in ____
tal
Use-
Thiopental
Secobarbital
Phenobarbital
Ultra-short acting (seizures/anesthesia) Short to intermediate acting (insomnia) Long acting (seizures)