An older adult client comes to the emergency department stating, "My heart is beating out of my chest." Based on this electrocardiogram (ECG) rhythm strip, which intervention should the nurse implement?

A. Assess oxygenation status: Palpitations and a rapid heart rate indicate tachycardia as evidenced by sinus tachycardia shown in the strip. The first nursing priority is to assess oxygenation, as hypoxia can trigger or worsen arrhythmias. Supplemental oxygen may be needed based on this assessment. B. Administer IV atropine: Atropine is used to treat symptomatic bradycardia, not tachycardia. In this case, where the heart is racing, and ECG shows tachycardia, atropine would not be appropriate and could worsen the condition by increasing the heart rate further. C. Prepare for a transcutaneous pacemaker: Transcutaneous pacing is indicated for unstable bradyarrhythmias, especially complete heart block or symptomatic sinus node dysfunction. It is not appropriate for a client who is experiencing tachycardia. D. Administer IV heparin infusion: Heparin is an anticoagulant used to prevent or treat blood clots. It is not a primary intervention for managing sinus tachycardia. While some cardiac conditions might involve heparin, it's not the immediate and direct intervention for the rhythm shown or the patient's primary complaint of palpitations.