What does the P-wave depict on an ECG?

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Multiple Choice

What does the P-wave depict on an ECG?

Explanation:
The P-wave shows atrial depolarization—the electrical activation and spread of the impulse through the atrial muscle, which triggers atrial contraction to push blood into the ventricles. On the ECG this appears as a small, smooth upward deflection that occurs just before the QRS complex. The big QRS complex reflects ventricular depolarization, not atrial activity. Atrial repolarization does occur, but it’s normally hidden within the QRS, while ventricular repolarization is seen as the T wave.

The P-wave shows atrial depolarization—the electrical activation and spread of the impulse through the atrial muscle, which triggers atrial contraction to push blood into the ventricles. On the ECG this appears as a small, smooth upward deflection that occurs just before the QRS complex. The big QRS complex reflects ventricular depolarization, not atrial activity. Atrial repolarization does occur, but it’s normally hidden within the QRS, while ventricular repolarization is seen as the T wave.

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