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
C
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).
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