While reviewing an electrocardiogram (EKG), the nurse knows that the "P" wave represents which of the following? 


•Atrial depolarization: P waves occur during atrial "squeeze" or contraction.

•The prefix "de" means "away" so as the atria squeeze, blood is moved "away" and into the ventricles.

•P waves are smaller as compared to the QRS waves because the atria are smaller heart chambers than are the ventricles.

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