Figure 18.2Using Figure 18.2, match the following:Atrial depolarization.

Question

BlackTom AI · Accepted Answer

To interpret the figure, we first identify the phase of the cardiac cycle associated with atrial depolarization.
- The atrial depolarization is represented on an ECG by the P wave, which occurs just before the ventricles depolarize (the QRS complex). It reflects activation of the atrial myocardium.
- In the labeled figure, the point marked A corresponds to the initial small deflection that occurs before the larger ventricular activity (the QRS complex). This deflection is characteristic of the P wave.
- Therefore, the correct association is that atrial depolarization is represented by label A, i.e., the P wave.

Why other labels (if you consider them) are not atrial depolarization:
- Labels B, C, D, and E occur at or around the QRS complex or the subsequent intervals/timeline, which correspond to ventricular depolarization (QRS), the corresponding ST/T relations, and ventricular repolarization (T wave), not atrial depolarization. Hence, they do not represent the atrial depolarization phase.
- In short, the onset of atrial activation is the P wave, which corresponds to label A in the figure.

Figure 18.2Using Figure 18.2, match the following:Atrial depolarization.

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Figure 18.2Using Figure 18.2, match the following:Atrial depolarization.

View Explanation

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