Antiarrhythmic Drugs Crossword puzzle help

- most widely used class III antiarrhythmic drug (9 letters)
i have seen two or three different "answers" for this so i am confused


- condition when a stimulus passes along a nerve and causes positive ions to move from outside the cell into the cell and the negative ions to move from inside the cell to outside the cell  ( 14 letters and it starts with D i think)

-condition when the nerve cells have positive ions on the outside and negative ions on the inside of the cell membrane (  12 letters )

- an effect of the antiarrhythmic drugs causing arrhythmias even though they are administered to resolve an existing arrhythmia. ( 13 letters )

-period between the transmission of a nerve impuluses along a nerve fiber ( 10 letters)