Which Is TRUE About Sinus Arrest and Sinus Exit Block

Multiple Choice

Which is TRUE about sinus arrest and sinus exit block?

A) Sinus exit block is an irregular rhythm; sinus arrest is regular.
B) Sinus arrest always ends in an escape beat; sinus exit block doesn't.
C) Sinus arrest and sinus exit block can both result in decreased cardiac output.
D) The pause in both sinus exit block and sinus arrest is a multiple of the R-R intervals.