Medications Flashcards
class 1
blocks Na channels
what do class 1 blocks Ns channels do
prolongs absolute refractory peroid and decreases risk of premature impulses, decreases automaticity
class 2
beta blocks
what do class 2 blocks beta blockers
inhibits dysrythmias mediated by SNS
competes with endogenous catecholamines for receptor sites
class 3 name and action
prolongs repoloarization and action potential
Class IV
blocks calcium channels
how do class IV calcium channels work
atria, sinus, and AV node
depress sinus AV condition and terminates TACHYS
proarrythmic drugs
*all of the ones I’m unfamiliar with
- quindine
procaniamide
dofetilide
ibutilide
example of class 1
lidocaine
example of class 2
metaprolol
example of class 3
amiodarone
example of class 4
diltiazem
torsades cause
long QT
1A and III
electrolytes
subarachnoid hemorrhage
adenosine
* action
slows condition through the AV node causing transient AV block
half life of adenosine
short
how treat torsades
magnesium
chrono affects
rate