The difference between Wenckebach and CHB is that:
A) CHB has a regular R-R, whereas Wenckebach is irregular.
B) CHB has a constant PRI, whereas in Wenckebach it gets progressively longer.
C) CHB has an irregular P-P interval, whereas it's regular in Wenckebach.
D) CHB has more P waves than QRS complexes, whereas Wenckebach always has one P wave for every QRS complex.
Answer: A
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