RCES- Drug classes Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
In the Vaughan Williams 1. Class Ia=A. Procainamide, Quinidine-
classification NA blocker
match each class with an example medium fast onset, reduces Vmax and
antiarrhythmic drug. prolongs
A. Procainamide, Quinidine action potential duration.
B. Diltiazem, Verapamil, Nifedipine 2. Class Ib=C. Lidocaine -Na blocker of
C. Lidocaine fast onset,
D. Amiodarone, Sotalol shortens action potential duration
E. Flecainide, Propafenone 3. Class Ic=E. Flecainide, Propafenone-
F. Inderal (Propranolol, Timolol, Na blocker-
Metoprolol. fast acting, slows conduction.
I. Class Ia 4. Class II=F. Inderal, Timolol, Metoprolol-
II ClassIb Beta-1
III. Class Ic channel blockers
IV. Class II 5. Class III=D. Amiodarone, Sotalol-
V. Class III Potassium
VI. Class IV channel blockers and prolong
repolarization.
6. Class IV=B. Diltiazem, Verapamil,
Nifedipine
(Blocks slow Calcium channels)
Which class of antiarrhythmics Class I
works
on the sodium channels?
,Which class of antiarrhythmics Class III= blocks K+ channels.
works
on the Potassium channels?
Which class of antiarrhythmics Class IV are Ca++ channel blockers
works
on the Calcium channels?
What class of antiarrhythmics are Class II are Beta blockers.
classified as Beta blockers?
Diltiazem or verapamil are used to A. Fib- Calcium channel blockers slow the
treat the following heart rhythm: rate and
decrease conduction time at the AV node.
IV lidocaine is used to: Treat ventricular arrhythmias in acute MI.
Lidocaine
inhibits the fast sodium channel and is
used only for
ventricular arrhythmias especially those
associated
with AMI.
Accepted cardiac use of IV When frequent PVCs or VT significantly
lidocaine drop the
is: BP.
what oral class 1 drug has effects Mexiletine- Class 1b. does not prolong
most similar to IV lidocaine? QRS
duration or repolarization.
, The most common toxic effect of Proarrhythmia
antiarrhythmic drugs is:
what is the 1st ling drug Adenosine.
recommended by ACLS guidelines
to terminate narrow complex
tachycardia in the stable patient?
Antiarrhythmic meds have many 1=B
side 2=A
effects and special considerations. 3=E
match together. 4=C
A. CNS effects (numbness, 5=D
tingling)
B. Don't shake ampule, Pulmonary
Fibrosis
C. Muscle paralysis, flush,
sweating
D. Do not mix with other meds.
E. Bradycardia, widens QRS,
vasodilation, Lupus-like effects
1. Amiodarone
2. Lidocaine
3. Procainamide
4. MgSO4
5. Sodium Bicarbonate.
Answers with Verified Solutions | Latest
Updated 2026
In the Vaughan Williams 1. Class Ia=A. Procainamide, Quinidine-
classification NA blocker
match each class with an example medium fast onset, reduces Vmax and
antiarrhythmic drug. prolongs
A. Procainamide, Quinidine action potential duration.
B. Diltiazem, Verapamil, Nifedipine 2. Class Ib=C. Lidocaine -Na blocker of
C. Lidocaine fast onset,
D. Amiodarone, Sotalol shortens action potential duration
E. Flecainide, Propafenone 3. Class Ic=E. Flecainide, Propafenone-
F. Inderal (Propranolol, Timolol, Na blocker-
Metoprolol. fast acting, slows conduction.
I. Class Ia 4. Class II=F. Inderal, Timolol, Metoprolol-
II ClassIb Beta-1
III. Class Ic channel blockers
IV. Class II 5. Class III=D. Amiodarone, Sotalol-
V. Class III Potassium
VI. Class IV channel blockers and prolong
repolarization.
6. Class IV=B. Diltiazem, Verapamil,
Nifedipine
(Blocks slow Calcium channels)
Which class of antiarrhythmics Class I
works
on the sodium channels?
,Which class of antiarrhythmics Class III= blocks K+ channels.
works
on the Potassium channels?
Which class of antiarrhythmics Class IV are Ca++ channel blockers
works
on the Calcium channels?
What class of antiarrhythmics are Class II are Beta blockers.
classified as Beta blockers?
Diltiazem or verapamil are used to A. Fib- Calcium channel blockers slow the
treat the following heart rhythm: rate and
decrease conduction time at the AV node.
IV lidocaine is used to: Treat ventricular arrhythmias in acute MI.
Lidocaine
inhibits the fast sodium channel and is
used only for
ventricular arrhythmias especially those
associated
with AMI.
Accepted cardiac use of IV When frequent PVCs or VT significantly
lidocaine drop the
is: BP.
what oral class 1 drug has effects Mexiletine- Class 1b. does not prolong
most similar to IV lidocaine? QRS
duration or repolarization.
, The most common toxic effect of Proarrhythmia
antiarrhythmic drugs is:
what is the 1st ling drug Adenosine.
recommended by ACLS guidelines
to terminate narrow complex
tachycardia in the stable patient?
Antiarrhythmic meds have many 1=B
side 2=A
effects and special considerations. 3=E
match together. 4=C
A. CNS effects (numbness, 5=D
tingling)
B. Don't shake ampule, Pulmonary
Fibrosis
C. Muscle paralysis, flush,
sweating
D. Do not mix with other meds.
E. Bradycardia, widens QRS,
vasodilation, Lupus-like effects
1. Amiodarone
2. Lidocaine
3. Procainamide
4. MgSO4
5. Sodium Bicarbonate.
