An early complex that breaks the regularity of the underlying rhythm and that is characterized by a narrow QRS complex and an upright P wave that differs in shape and size from the P waves of the other complexes MOST accurately describes a(n):
A) atrial escape complex.
B) wandering atrial pacemaker.
C) junctional escape complex.
D) premature atrial complex.
Answer: D) premature atrial complex.
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