If You Were to Administer an Antiarrhythmic Drug That Was

Multiple Choice

If you were to administer an antiarrhythmic drug that was a complete sodium channel blocker, which of the following would you expect?

A) It would prevent the efflux (outflow) of calcium from within the cell.
B) It would impede the sodium-potassium pump from replacing the ions to their original locations.
C) It would cause excessive muscular contraction, because sodium is the principal cation in myofibril contraction.
D) It would prevent the development of phase 0, thereby inhibiting depolarization.