What are the distinguishing characteristics of PJCs?
A. They have an inverted or absent P wave or a P wave that follows the QRS complex.
B. They have a changing P wave configuration with at least three variations in one lead.
C. They have a clearly changing P wave and a heart rate of 101 to 150 bpm.
D. They have an irregular rhythm; the P wave is inverted and may appear before, during, or after the QRS complex.
Answer: D
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