Pharm 1 Flashcards
SNS
adrenergic system
fight or flight
receptor cells: Alpha 1 and 2, Beta 1 and 2
Neurotransmitter: norepinephrine
PNS
cholinergic system
rest and digest
receptor cells: Nicotinic and muscarinic
neurotransmitter: acetylcholine
sympathetic stimulants
sympathomimetics (adrenergic, adrenomimetics, or adrenergic agonists)
increase blood pressure
increase pulse rate
relax bronchioles
dilate pupils
relax uterine muscles
increase blood glucose
sympathetic depressants
sympatholytics (adrenergic blockers, adrenolytics, or adrenergic antagonists)
decrease pulse rate
decrease blood pressure
constrict bronchioles
direct-acting parasympathetic stimulants
parasympathomimetics (cholinergic or cholinergic agonists)
decrease blood pressure
decrease pulse rate
constrict bronchioles
constrict pupils
increase urinary contraction
increase peristalsis
Adrenergic agonist
sympathomimetics
stimulate the adrenergic receptors
4 main receptor sites: Alpha 1 and 2, Beta 1 and 2
Alpha 1
- blood vessels, vasoconstriction, increased blood pressure, increased contractibility of the heart
- eye, mydriasis (pupil dilatation)
- bladder, relaxation
- prostate, contraction
Alpha 2
- blood vessels, decrease blood pressure
- smooth muscle, decrease GI tone and motility
Beta 1
- heart, increase heart contraction, increase heart rate
- kidney, increase renin secretion, increased angiotensin, increase blood pressure
Beta 2
- smooth muscle, decrease GI tone and motility
- lungs, bronchodilation
- uterus, relaxation of uterine smooth muscle
- liver, activation of glycogenolysis, increased blood sugar
adrenergic antagonist
sympatholytic
block the adrenergic recptors
adrenergic agonist
- neurotransmitter inactivation
inactivation by
- reuptake of transmitter back into the neuron
- enzymatic transformation or degradation
- diffusion away from the receptor
- two enzymes that deactivate the metabolism of norepine: MAO, COMT
classification of adrenergic agonists
direct-acting (epinephrine, norepinephrine)
- directly simulates adrenergic receptor
indirect-acting (amphetamine)
- stimulates the release of norepinephrine from terminal nerve endings
Mixed-acting (ephedrine)
- stimulates adrenergic receptors sites and stimulates the release of norepinephrine from terminal nerve endings
epinephrine (adrenaline)
nonselective
action
- alpha 1 increases BP
- Beta 1 increases HR
- Beta 2 promotes bronchodilation
-inotropic
- vasoconstrictor
- bronchodilator
contradictions and caution
- cardiac tachyarrhythmias, glaucoma
- hypertension, hyperthyroidism, diabetes mellitus, pregnancy
uses
- anaphylaxis, anaphylactic shock, bronchospasms, status asthmatics, cardiogenic shock, cardiac arrest
side effects
- cardiac dysrhythmias, palpations, tachycardia, hypertension, dizziness, headache, sweating, insomnia, restlessness, tremors, hyperglycemia (stim liver produce more sugar)
drug interactions
-beta-blockers - decrease epinephrine action
-digoxin - can cause cardiac dysrhythmias
Nursing interventions
- monitor BP, HR, and urine output
- report tachycardia, and palpations, avoid when breastfeeding, and cold medicines
Albuterol
selective
- acts on beta 2- adrenergic receptors
- promotes bronchodilation
uses
- treats bronchospasm, asthma, bronchitis, COPD
caution
- severe cardiac disease, hypertension, hyperthyroidism, diabetes, renal dysfunction, pregnancy (cat C)
side effects
- tremors, nervousness, restlessness, dizziness
- tachycardia, palpations, cardiac dysthymias
drug interactions
- may increase effect with other sympathomimetics, MAOIs, and increased tricyclic antidepressants
- antagonize effect w beta blockers
nursing process: adrenergic agonist
nursing interventions- monitor IV sites frequently when administering norepinephrine or dopamine, monitor ECG for dysrhythmias when adrenergic agonists are given IV
central-acting alpha agonist
clonidine
- selective alpha-2 adrenergic agonist
- used primarily to treat hypertension (pretty good at it)
side effects
- headache, nasal congestion, drowsiness, nightmares, constipation, edema, ED, elevated liver enzymes
short half life
adrenergic antagonist
block effects of adrenergic neurotransmitter
- block alpha and beta receptor sites; directly and indirectly
types
- alpha- adrenergic antagonist
- beta- adrenergic antagonist
- adrenergic neuron antagonist
alpha adrenergic antagonist
drugs that inhibit a response at alpha- adrenergic receptor site
- selective (block alpha 1)
- non selective (block alpha 1 and 2)
action
- promote vasodilation
use
- decrease symptoms of BPH, PVD
- not frequently used
beta-adrenergic antagonists
beta blocker actions
- decreases HR and BP
nonselective beta blockers
- blocks beta 1 ( decrease BP and pulse)
- blocks beta 2 ( bronchoconstruction, use w caution w pt w COPD or asthma)
- propranolol HCI (uses- angina, cardiac dysthymia
beta-adrenergic blockers
selective beta blockers
- metoprolol, atenolol
- blocks beta1 only
side effects/adverse reactions
- bradycardia, hypotension, dysthymias, heart failure, headaches, dizziness, fainting, fatigue, drowsiness, depression, N/V, diarrhea
adrenergic neuron antagonist
block release of norepinephrine
- clinically used to decrease BP
Nursing interventions
- monitor vital signs, report marked changes for example significant decrease in BP, watch for falls, and orthostatic hypertension
cholinergic agonists
drugs that stimulate PNS
- mimics acytocoline
cholinergic receptors
- muscarinic receptors (effects smooth muscles, slow heart rate
- nicotinic receptors ( affects skeletal muscles)
types of cholinergic agonists
- direct acting ( acts on receptors to activate tissues response)
- indirect acting (inhibits action of enzyme cholinesterase)
direct-acting cholinergic agonists
primarily selective to muscarinic receptors
muscarinic receptors located in smooth muscles
- heart, GI, GU, glands
- metocloprimide (used to increase gastric emptying, treats gasoparistis, nausea and gerd)
- pilocarpine (constrict pupils, treat glaucoma)
- bethanechol chloride (used to increase urination, treats urination retention, pee easily)
bethoanechol
urinary retention
side effects
- blurred vision, miosis
- hypotension, bradycardia, cardiac dysrhythmias, sweating, flushing
contraindications
- bradycardia, hypotension, COPD, peptic ulcer, hyperthyroidism
nursing interventions bethanechol
BP, heart rate, orthostatic hypotension, listen to breathe sounds rales and crackling, cholinergic crisis (overdoes) - muscle weakness and increased salvation
effects of cholinergic antagonist
heart
- large doses increase HR; small doses decrease HR
lungs
- bronchodilation, decrease secretions
GI
- relax smooth muscle tone, decrease motility and peristalisis
Ocular
- dilate pupils
Glandular
- decrease salvation and perspiration
CNS
- tremors and muscle rigidity decreased
GU
- relax detrusor muscle, increase sphincter construction
anticholinergics
atropine
- action/use ( increase HR, used for preop to decrease salvation)
side effects/ adverse reactions
- photophobia, headache, blurred vision
- abdominal distention, nausea, constipation, dry mouth and skin, decreased sweating
nursing interventions
- vitals, urine output, bowel sounds (slowing down GI)
- mouth care and eye drops, bedrails, driving
- avoid hot environments
- wear sunglasses
antiparkinsonism - anticholinergics
benzotropine
biperiden
trihexyphenidyl HCI
action - decreases involuntary movement, tremors, muscle rigidity
nursing process - atropine
assessment - urine output as urinary retention may occur
diagnosis - urinary retention related to atropine
planning - pt secretions w decrease before surgery
interventions - monitor vitals, intake and output, mouth care, bowel sounds
anticholinergic for motion sickness
antihistamine
- scopolamine
- treats motion sickness, N/V
- patch delivers dose for 3 days
side effects
- tachycardia, hypotension, dry mouth, constipation, blurred vision, flushing, muscle weakness
CNS stimulants
ADHD
narcolepsy
reversal of respiratory destress
categories
- amphetamines, caffeine (stimulate cerebral cortex, euphoria, alertness)
- analeptics, caffeine ( stimulate respiration)
- anorexiants (suppress appetite)
amphetamines
action
- stimulate release of norepinephrine and dopamine
- inhibit repuptake of norepinephrine and dopamine
side effects
- CV: tachycardia, palpitations, hypertension dysrhythmias
- Neuro: restlessness, irritability, confusion, euphoria, insomnia, blurred vision
GI: anorexia, dry mouth, weight loss, diarrhea, constipation
excess used: psychosis
amphetamine- like drugs for adhd
demethylphenidate
methylphenidate
controlled substance schedule II
uses
- increases attention span and cognitive performance
- decreases impulsiveness, hyperactivity, and restlessness
dosing
- 30-45 min before meals
- caffeine to increase effect
- no evening or before bed
cautions
- CVD, HTN, PD, psychosis, hyperthyroidism, seizures
- increases effects of oral anticoagulants, barbiturates, anticonvulsant, hypertensive crisis w MAOIs
amphetamine- like drugs for narcolepsy
methylphenidate
modafinil
increases wakefulness in pt w sleep disorders
unknown mechanism of action
nursing process amphetamine
baseline VS, mental status, height, weight, growth
baseline labs
planning- hyperactivity will be decreased within 3 days, pt HR and BP with be within normal limits
teaching - before meals, no alcohol, monitor weight
anorexiants
causes stimulate effect on hypothalamic and limbic areas of brain to suppress appetite
no one under 12
side effects
CV: Tachycardia, hypertension, palpitations
Neuro: seizures nervousness, irritability
sexual: ED
example: benzphetamine, most commons is phentermine
analeptics
primary use: stimulate respiration
examples - caffeine, theophylline (asthma), used for neonatal apnea
doxapram - used for post anesthesia respiratory destress
side effects - (similar to those of anorexiants)
sleep disorders
insomnia- fall asleep / stay asleep
- more common in females and older pt
- non- pharm sleep hygiene first
- pharm- sedative hypnotics
non-pharm management
- wake up at same time
- no napping
- avoid caffeine, alcohol, and nicotine
- no heavy meals
- take warm bath
sedative - hypnotics
sedatives - treat sleep disorders
sedative hypnotics cat
- barbiturates
- benzodiazepines
- non benzodiazepines
can be short or long term acting
short term at lowest dose
no hypnotics in those w severe respiratory disorders
general side effects
- hangover
- vivid dreams and nightmares
- drug dependence
- drug tolerance
- excessive depression
- respiratory depression
- hypersensitivity
barbiturates
long- intermediate- short/ ultrashort - acting
restrict to short term - no longer than 2 weeks
interactions
- alcohol, opioid, other sedative hypnotics
- decreases effects of oral anticoagulants, glucocorticoids, tricyclics antidepressant, quinidine
short acting - secobarbital
intermediate- butabarbitol
benzodiazepines
hypnotics
- flurazepam, alprozolam, temazepam, triazolam( intermediate sedation), estazolam, quazepam
sleep disorders and anxiety
- lorazepam and diazepam
action
- interacts w neurotransmitter GABA to reduce neuron excitability
Uses
- reduce anxiety, treat insomnia
antidote- flumazenil - vivid dreams and nightmares
nursing process
- assessment ( determine whether the pt has history of insomnia or anxiety
- planning - receive hood sleep
- observe for adverse reactions, teach about non pharm methods
no benzodiazepines
zolpidem
action
- neurotransmitter inhibition
- duration of action is 6-8 hours
schedule IV - “4”
use
- treat short term (less than 10 days insomnia
- often used for longer periods
melatonin agonists
newest cat
ramelteon - not a controlled substance
- first FDA approved hypnotic nit classified as a controlled substance
- selective targets melatonin receptors to regulate circadian rhythm to treat insomnia
- nit been shown to decrease REM sleep
- adverse effects
- drowsiness, dizziness, fatigue, headache, nausea, and suicidal ideation
nursing process: sedative hypnotic
ascertain the pt problem w sleep disturbance
sleep deprivation due to anxiety
pt will sleep 6-8 hours
observe pt for side effects if non benzodiazepines
anesthetics
types
general (depresses the CNS)
- alleviate pain
- loss of consciousness
local
- pain relief in limited area
routes
- inhalation
- IV
- topical
- local
- spinal
balanced anesthesia
- a hypnotic given night before surgery
- premedication ( w an opioid analgesic or benzodiazepines- example: midazolam)
- with an anticholinergic - decreases secretions (atropine)
- a short acting nonbarbiturates - propofol
- inhaled gas - nitrous oxide and oxygen
- muscle relaxant given as needed
inhalation anesthetics
nitrous gas (laughing gas) - doesn’t last long
provides smooth induction
usually combined w
- non barbiturate - propofol
- strong analgesic- morphine
- muscle relaxant - pancuronium
adverse effects
- respiratory depression, hypotension, dysrhythmias, malignant hyperthermia
intravenous anesthetics
droperidol, etomidate, ketamine - rapid onset and short duration of action
midazolam and propofol - sedation for minor surgery, can still be responsive to commands
adverse effects - respiratory depression, hypotension
topical anesthetics
limited to mucous membranes, broken or unbroken skin surfaces, and burns
forms - solution, liquid spray, ointment, cream, gel, and powder
decreases sensitivity of nerve endings of the affected area
local anesthetics
block pain at the site where the drug is given (decrease nerve sensitivity)
consciousness is maintained
use
- dental procedure
- suturing skin
two groups
ester and amides
- have very low allergic reaction
procaine hydrochloride- dental
lidocaine hydrochloride - rapid onset, longer duration
bupivacaine hydrochloride 3-10 hours
spinal anesthesia
local ejected in the subarachnoid space
adults - below first lumbar space
children - below third lumbar space
side effects
- respiratory distress
- headache
- hypotension
spinal column nerve blocks
spinal block - penetration of the anesthetic into subarachnoid membrane between the pia mater and arachnid membrane
epidural block - placement of the local anesthetic in the epidural space posterior to the spinal cord or dura mater
caudal block - placed through the sacral hiatus
saddle block - placed at the lower end of the spinal column to block the perineal area
nursing process anesthetics
monitor the post op state of sensorium
urine output
vital signs
epilepsy
seizure disorder resulting from abnormal electric discharge from cerebral neurons
characteristics
- loss of consciousness
- involuntary, uncontrolled movements
cause
- unknown
- second to brain trauma or anoxia, infection, stroke
isolated seizures (not epileptic) can occur due to fever, acid base imbalance, alcohol, drugs
international classification of seizures
common generalized seizure types
- tonic- clonic (grand mal)
• most common
• generalized alternating muscle spasms and jerkiness
- absence (petit mal)
•brief loss of consciousness (10 seconds or less)
• usually occurs in children
common partial seizures
- psychomotor- repetitive behavior - chewing or swallowing motions
• behavioral changes
• motor seizures
anti seizure drugs
-anticonvulsants or anti epileptic drugs
- are CNS depressants that
• stabilize nerve cell membranes
• suppress abnormal electric impulses in cerebral cortex
prevent seizures but not curative
hydantions
phenytoin
- contraindications
• pregnancy
- therapeutic serum level
• 10-20 mcg/mL
- side effects
• gingival hyperplasia, nystagmus, headache, dizziness, slurred speech, ventricular fibrillation, depression, hyperglycemia, thrombocytopenia, leukopenia (low platelets and low WBC), purple glove syndrome, stevens- johnson syndrome
drug interactions
- increased effects w cimetidine, isoniazid
- decreases effects w folic acid, ginko, antipsychotic
nursing process phenytoin
renal and hepatic functions lab
look at drug and herb use
pt seizure frequency will lower
seizure precautions
female pt taking BC
barbiturates
phenobarbital
action
- enhances GABA activity
uses
- tonic clonic, partial, myoclonic seizures, status epilepticus
therapeutic serum level
- 20-40
side effects
- sedation
- tolerance
discontinuation
- should be gradual
benzodiazepines
clonazepam
- treats absence and myoclonic seizures
- tolerance may occur in 6 months
diazepam
- treats status epilepticus
- must be administered IV for status epilepticus
- short term effect
• other antiseizure drugs must be given during it immediately after administration of diazepam
“bridge” - still needs to do more