10 free CET practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
CET Practice Test 15Tutor mode
Question 1 of 10
EKG Analysis and Interpretation
A healthy 19-year-old's lead II strip shows a rate that varies between 64 and 88/min, an identical upright P wave before each QRS, a constant PR of 0.16 s and narrow QRS complexes. The R-R intervals lengthen and shorten gradually rather than abruptly. Which rhythm is this?