Question

After teaching a group of nursing students about antiarrhythmics, the instructor determines that the teaching was successful when the students identify which of the following as a class IA antiarrhythmic? Select all that apply.

A) Quinidine (Quinaglute)
B) Lidocaine (Xylocaine)
C) Propafenone (Rythmol)
D) Disopyramide (Norpace)
E) Flecainide (Tambocor)

Answer 1

Quinidine (Quinaglute) and Disopyramide (Norpace) are identified as class IA antiarrhythmics. Lidocaine (Xylocaine) is class IB, Propafenone (Rythmol) and Flecainide (Tambocor) are class IC.

Step-by-step explanation:

The antiarrhythmic agents classified as class IA include Quinidine (Quinaglute) and Disopyramide (Norpace). These medications work by blocking the sodium channels, which have a moderate effect on the action potential and can slow down the conduction velocity. As such, these agents can be both antiarrhythmic and proarrhythmic. However, Lidocaine (Xylocaine) is a class IB antiarrhythmic, Propafenone (Rythmol) is class IC, and Flecainide (Tambocor) is also class IC, which means they all work by different mechanisms compared to class IA antiarrhythmics. Quinidine (Quinaglute) and Disopyramide (Norpace) are identified as class IA antiarrhythmics. Lidocaine (Xylocaine) is class IB, Propafenone (Rythmol) and Flecainide (Tambocor) are class IC.