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The normal PR interval is from 0.12-0.2 seconds and is measured on the EKG from the beginning of the P wave to the beginning of the QRS complex. This interval represents the onset of atrial depolarization to the onset of ventricular depolarization and consists of:
J. For EKG 13, how long is the PR interval. You must circle where you took your measurement and mark the beginning and the end of the PR interval. K. In EKG 6, does the electrical activity in limb leads I and II suggest that the wave of depolarization in the ventricles is spreading: (circle only the best answer.