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43 Cards in this Set

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What effect does digoxin have on the AV node
slows it down
enhances vagal effects
Effect of blocking Na channels on conduction velocity and effective refractory period in fast response tissue
decreases conduction velocity
no effect on ERP
Effect of blocking Na channels on conduction velocity and effective refractory period in nodal tissue
no effect on conduction velocity
no effect on ERP
Effect of blocking K channels on conduction velocity and effective refractory period in fast response tissue
no effect on conduction velocity
prolongs ERP
Diltiazem does which of the following for Afib?
rate control or rhythm control
rate control
Diltiazem is a Non-DHP CCB
Blocking which channels will cardiovert Afib to NSR?
Na or K channels
MOA - quinidine
blocks Na channels (intermediate recovery)
blocks K channels
increases AV conductance (inhibits vagus)
MOA - procainamide
blocks Na channels (intermedicate recovery)
blocks K channels
MOA - lidocaine
blocks Na channels (fast recovery)
MOA - flecainide
blocks Na channels (slow recovery)
MOA - amiodarone
blocks Na, K, Ca channels
blocks beta receptors
MOA - sotalol
blocks K channels
blocks beta receptors
MOA - ibutilide
blocks K channels
MOA - dofetilide
blocks K channels
MOA - adenosine
blocks AV node
what causes torsades de pointes
blocking K channels and increasing the ERP
Which antiarrhythmics are used IV only
procainamide
lidocaine
ibutilide
adenosine
Which channels do you want to block to treat Vfib or Vtach
Na or K channels
Which channels do you want to block to treat AVNRT?
Na or K channels
or AV nodal blockers
Which of the following agents has a higher proarrhythmic effect because it has a higher chance of affecting normal tissue?
lidocaine or flecainide
flecainide
What effect does quinidine have on the AV node?
inhibits vagal activity
increases AV conduction
What effect does amiodarone have on the AV node?
Blocks Ca channels and beta receptors
decreases AV conduction
Side effect - Cinchonism
quinidine
Blocking which channel prolongs the QT interval on an ECG?
K channels
Side effect - lupus like syndromes
procainamide with prolonged use
Which of the following should be avoided in heart failure patients because of their negative inotropic effect?
flecainide, amiodarone, sotalol, dofetilide, ibutilide, beta blockers, and/or calcium channel blockers
flecainide, sotalol, beta blockers (unless used to treat the HF), and calcium channel blockers
lidocaine can treat which of the following arrhythmias?
atrial fibrillation
WPW
AVNRT
ventricular fibrillation
ventricular fibrillation
Side effect - paresthesia, tremor, nausea, hearing disturbances, slurred speech, convulsions
lidocaine
'anesthetize the brain'
Which of the following would you use to treat an arrhythmia in a patient with previous MI?
amiodarone or flecainide
amiodarone
What is the main contraindication for use of flecainide?
CV disease (besides the arrhythmia)
Side effect - blue skin, photosensitivity
amiodarone
Side effect - Pneumonitis and pulmonary fibrosis, peripheral neuropathy
amiodarone
Side effect - Fatigue, sinus bradycardia, dyspnea
beta blockers, including sotalol
What effect will diltiazem have on Vtach?
May cause hypotension, reflex sympathetic stimulation of heart and Vfib
Diltiazem will cardiovert which of the following arrhythmias?
AVNRT or Afib
AVNRT
What is the half life of amiodarone?
many days (13-103 days)
What is the half life of adenosine?
10 seconds
Adenosine will cardiovert which of the following arrhythmias?
AVNRT, Afib, Vfib
AVNRT
Side effect - transient asystole
adenosine
Best prevention for arrhythmia in patient with long QT syndrome?
beta blocker
sympathetic stimulation can precipitate the arrhythmia
Which of the following should you avoid in a patient with long QT syndrome?
quinidine, flecainide, verapamil
quinidine
What are two situations where you can use propranolol for Afib?
Slow the AV node and ventricular rate
Prevent the arrhythmia if it is triggered by physical or emotional stress
Will verapamil cardiovert atrial flutter?
No