An adult patient with third-degree AV block is on continuous cardiac monitoring. The EKG will show which of the following rhythm characteristics?
A) PP interval and RR intervals are irregular
B) PP interval equal to RR interval
C) Fewer QRS complexes than P waves
D) PR interval constant
Ans: C
Feedback: In third-degree AV block, no atrial impulse is conducted through the AV node into the ventricles. As a result, there are impulses stimulating the atria and impulses stimulating the ventricles. Therefore, there are more P waves than QRS complexes due to the difference in the natural pacemaker (nodes) rates of the heart.
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