When reviewing an electrocardiogram (EKG), the nurse knows that the QRS waveform represents which of the following?

Ventricular depolarization


• Ventricular depolarization occurs during the contraction or squeeze of the heart muscle (myocardium).

• The prefix "de" means away, so as the ventricles depolarize, the ventricles squeeze and move blood away from the heart.

• The "QRS" waveforms are the largest on an EKG due to the large size of the ventricles and stronger squeeze during heart contraction.

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