When interpreting an ECG, the nurse would keep in mind which of the following about the P wave? Select all that apply.
a. Reflects electrical impulse beginning at the SA node.
b. Indicated electrical impulse beginning at the AV node.
c. Reflects atrial muscle depolarization.
d. Identifies ventricular muscle depolarization.
e. Has duration of normally 0.11 seconds or less.
Answer: a, c, e. In a client who has had an ECG, the P wave represents the activation of the electrical impulse in the SA node, which is then transmitted to the AV node. In addition, the P wave represents atrial muscle depolarization, not ventricular depolarization. The normal duration of the P wave is 0.11 seconds or less in duration and 2.5 mm or more in height.
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