Second-degree AV block type I is characterized by _____ intervals
a. irregular P to P
b. regular R to R
c. regular P to P intervals and irregular R to R
d. irregular P to P intervals and irregular R to R
C
Second-degree AV block type I is characterized by an irregular ventricular rhythm (i.e., irregular R to R intervals), more P waves than QRS complexes, and P waves that occur regularly (i.e., regular P to P intervals).
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