An atrial pacing spike on an ECG is most commonly located before which waveform?

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Multiple Choice

An atrial pacing spike on an ECG is most commonly located before which waveform?

Explanation:
An atrial pacing spike is the electrical stimulus delivered to the atria, and when it captures, it triggers atrial depolarization shown on the ECG as the P wave. So the spike is most commonly seen just before the P wave. If capture fails, you might see a spike with no following P wave. Spikes before the QRS would indicate ventricular pacing, a spike coinciding with the T wave isn’t the typical pattern, and a spike with no associated wave would reflect loss of capture.

An atrial pacing spike is the electrical stimulus delivered to the atria, and when it captures, it triggers atrial depolarization shown on the ECG as the P wave. So the spike is most commonly seen just before the P wave. If capture fails, you might see a spike with no following P wave. Spikes before the QRS would indicate ventricular pacing, a spike coinciding with the T wave isn’t the typical pattern, and a spike with no associated wave would reflect loss of capture.

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