Upon review of an EKG you notice periodic, repetitively absent QRS complexes and "grouped beating." Which of the following is the explanation?
A. Third degree heart block
B. Mobitz Type II heart block
C. Mobitz Type I heart block
D. first degree heart block
E. sinus tachycardia
Answer: C, Mobitz Type I heart block
I don't like the wording of this question, but typically "group beating" suggests Wenckebach. The fact that there are absent QRS complexes means there is a second or third degree AVB. In Mobitz II, the PR intervals are the same - so no "grouped" beating, in Third degree, there is no rhyme or reason to the rhythm. In Wenckebach, the rhythm "repeats", causing a "regularly irregular" rhythm.
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If you are studying for the PANCE or the PANRE I recommend these Review Books.