A nurse on a medical-surgical unit is caring for a client who reports pain in the jaw, back, and shoulder, shortness of breath, and nausea.
Which of the following actions should the nurse take?

Choice A rationale

Slow repolarization of ventricular Purkinje fibers is not associated with the P wave. The P wave represents atrial depolarization, which is the electrical activation of the atria.

Choice B rationale

Early ventricular repolarization is represented by the T wave, not the P wave. The P wave specifically reflects atrial depolarization.

Choice C rationale

Atrial depolarization is the correct role of the P wave. It represents the electrical activity that leads to atrial contraction. Normal duration is 0.06 to 0.12 seconds.

Choice D rationale

Ventricular depolarization is represented by the QRS complex. The P wave precedes this and is related to atrial depolarization, not ventricular events.

Choice A rationale

Constipation is not a common adverse effect of atenolol; it is more likely with other medications or dietary changes.

Choice B rationale

A cough is not typically linked to atenolol; it is more commonly an adverse effect of ACE inhibitors due to bradykinin accumulation.

Choice C rationale

Tremor is not a recognized adverse effect of atenolol; it is associated with stimulant medications or anxiety disorders.

Choice D rationale

Bradycardia, a decrease in heart rate, is a known adverse effect of atenolol as it reduces sympathetic nervous system activity. .