While analyzing a patient's electrocardiogram (EKG), the nurse notes that there are four small boxes from the beginning of the P wave to the beginning of the R wave. The PR interval is


• On standard EKG paper, each small box represents 0.04 second on the horizontal axis (time) and 1 mm on the vertical axis (voltage).

• 0.04 second x 4 boxes = 0.16 second.

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