A PR Interval of Less Than 0

Multiple Choice

A PR interval of less than 0.12 seconds indicates:

A) an intermittent blocking of the impulse as it passes through the AV node.
B) an increased rate of impulse discharge from the SA node.
C) a pacemaker site which is either in or close to the AV junction.
D) a delay in conduction of the impulse between the SA node and the ventricles.