The QRS wave on the ECG represents which event?

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Prepare for the AACN Essentials of Critical Care Nursing Test. Study with multiple choice questions and thorough explanations. Ace your test effortlessly!

Multiple Choice

The QRS wave on the ECG represents which event?

Explanation:
The QRS complex represents ventricular depolarization. This is the rapid electrical activation of the ventricles that triggers their contraction to pump blood out to the lungs and the rest of the body. The atria depolarize earlier, producing the P wave, but that signal is small and masked when the ventricles depolarize. Atrial repolarization occurs during this same period and is not seen as a separate deflection. After the QRS, the T wave shows ventricular repolarization as the ventricles recover. Normal QRS duration is typically under 0.12 seconds; a wider complex suggests a conduction delay such as a bundle branch block.

The QRS complex represents ventricular depolarization. This is the rapid electrical activation of the ventricles that triggers their contraction to pump blood out to the lungs and the rest of the body. The atria depolarize earlier, producing the P wave, but that signal is small and masked when the ventricles depolarize. Atrial repolarization occurs during this same period and is not seen as a separate deflection. After the QRS, the T wave shows ventricular repolarization as the ventricles recover. Normal QRS duration is typically under 0.12 seconds; a wider complex suggests a conduction delay such as a bundle branch block.

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