A.  AV heart blocks are

a. partial delays or complete interruptions in the cardiac conduction

pathway between the atria and ventricles.

b. early ectopic beats that originate outside the SA node. c. a shifting of the pacemaker site between the SA node, atria, and/or AV

junction.

d. the result of accessory conduction pathways between the atria and ventricles.

B. In 1st-degree AV heart block,

a. the PR intervals are greater than 0.20 seconds in duration.

b. not all the P waves are followed by QRS complexes.

c. the P waves are inverted.

d. the underlying rhythm is slow.

C. 1st-degree AV heart block is considered a/an

a. intermittent block.

b. complete block.

c. consistent delay in conduction.

d. partial block.

D. In 2nd-degree AV heart block, type I,

a. the PR intervals get progressively shorter.

b. not all the P waves are followed by a QRS complex.

c. the P waves are inverted.

d. the rhythm appears to be irregularly irregular.