In third-degree AV block, _____.
A) the atrial rhythm (P-P interval) is irregular
B) the ventricular rhythm (R-R interval) is irregular
C) there is no PR interval because the atria and ventricles beat independently of each other
D) the PR interval after a nonconducted P wave is shorter than the interval preceding the nonconducted beat

Question

Quizplus · Accepted Answer

In third-degree atrioventricular (AV) block, both the atrial and ventricular rhythms are regular, but the atria and ventricles beat independently; therefore the P waves that are present are unrelated to the QRS complexes (i.e., AV dissociation exists).

In Third-Degree AV Block, _____