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

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.

 

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