Final Exam Review Flashcards
(113 cards)
major neurotransmitters in the ANS
PSNS: ACh and muscarine
SNS: norepinephrine and epinephrine
terms describing PSNS drugs
mimic ACh –> cholinergic –> muscarinic agonist –> parasympathomimetic
block ACh –> anticholinergic –> muscarinic antagonist –> parasympatholytic
terms describing SNS drugs
mimic NE –> adrenergic –> adrenergic agonist –> sympathomimetic
block NE –> antiadrenergic –> adrenergic antagonist –> sympatholytic
physiologic response of norepinephrine
⍺1: vasoconstriction, increase BP
β1: cardiac stimulation, increase force and conduction
physiologic response of epinephrine
⍺1: vasoconstriction, increase BP
β1: cardiac stimulation, increase force, rate, and conduction
β2: vasodilation, lower BP, bronchodilation
physiologic response of ⍺1 receptors
vasoconstriction
pupillary dilation
GI inhibition
Gq
physiologic response of ⍺2 receptors
vasoconstriction
prejunctional inhibition of NE release
in CNS: decrease CV SNS input
Gi
physiologic response of β1 receptors
cardiac stimulation
secretion of renin
Gs
physiologic response of β2 receptors
cardiac stimulation
bronchodilation
uterine relaxation
GI inhibition
vasodilation
Gs
⍺1 agonists
phenylephrine
- vasoconstriction, decongest
⍺2 agonists
clonidine
- reduce BP, decrease SNS activity to heart and blood vessels
brimonidine
- glaucoma, inhibit aqueous humor production and stimulates outflow to decrease intraocular pressure
methyldopa
- prodrug, HTN
β nonselective agonists
isoproterenol
- bronchodilation, increased cardiac output
β1 agonists
dobutamine
- racemic mixture
β2 agonists
albuterol
terbutaline
- bronchodilation
β3 agonists
mirabegron
- overactive bladder
⍺ nonselective antagonists
phenoxybenzamine
- irreversable antagonist
phentolamine
- competitive and reversible, vasodilation, tachyphylaxis
⍺1 antagonists
prazosin
- vasodilation
tamsulosin
- relaxation of smooth muscle in enlarged prostate and in bladder base
β nonselective antagonists
propranolol
timolol
- decrease cardiac output and HR, decrease intraocular pressure (timolol, ciliary epithelium)
β1 antagonists
metoprolol
- cardioselective, less bronchoconstriction
⍺/β mixed antagonists
carvedilol
labetolol
- β antagonism prevents reflex tachycardia from ⍺1 antagonism
- vasodilation with ⍺1 antagonism prevents bradycardia from β antagonism
VMAT inhibitors
riserpine
NET inhibitors
cocaine
methylphenidate
atomoxetine
indirect sympathomimetics
amphetamine/methamphetamine
ephedrine/pseudoephedrine
tyramine
physiological response of M1 receptors
postganglionic, depolarization, Gq