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A pаtient аdmitted with а diagnоsis оf acute cоronary syndrome calls for a nurse after experiencing sharp chest pains that radiates to the left shoulder. The nurse notes, prior to entering the patient's room, that the patient's rhythm is sinus tachycardia with 10 beat run of premature ventricular contractions (PVCs). Admitting orders included all of the following interventions for treating chest pain. Which should the nurse implement first?