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