antidysrhythmic drug classes

Question 1

dysrhythmia assoicated with prolonged QTc interval

Answer 1

torsades de pointes tach

Question 2

drugs associated with this

Answer 2

class 1a (quinidine)
class III (amiodarone)
class 1 c

Question 3

treatment of torsades de points

Answer 3

withdrawl causative agent
correct electrolytes
IV mag sulfate

Question 4

class III

Answer 4

potassium channel blockade
amiodarone and sotalol
used for prophylaxis ventricular arrhythmias

Question 5

biggest warning for class III

Answer 5

used for arrhymias may cause severe arrhythmias, fatal pulmonary and liver toxcities

Question 6

class 1a

Answer 6

quinidine

widens qrs but blocking potassium and delaying repolarization

Question 7

class 1b

Answer 7

lidocaine

reduce ectopid foci stimulation in the ventricles

Question 8

class 1c

Answer 8

flecanide

rhythm control in atria