Q. The principal action common to all class I antiarrhythmic drugs is: (Solved)
1. Na+ channel blockade
2. K+ channel opening
3. Depression of impulse conduction
4. Prolongation of effective refractory period
- a. Na+ channel blockade
1. Na+ channel blockade
2. K+ channel opening
3. Depression of impulse conduction
4. Prolongation of effective refractory period