Pharm 1 Flashcards
(143 cards)
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