An adult patient with third-degree AV block is admitted to your unit and placed on continuous cardiac monitoring. What rhythm characteristics will the EKG show?
A) PP interval and RR interval 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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