The patient is a 75-year-old female who has been admitted to the preoperative area in preparation for pacemaker insertion. She reports that she is undergoing this procedure because her heart rate has been consistently low, she feels constantly fatigued, and she has experienced one episode of fainting due to a low heart rate. The patient has a history of progressively worsening symptomatic bradycardia and a history of atrial fibrillation, which is controlled by medication. She has been off anticoagulants for four days in preparation for the procedure. As the nurse prepares the patient’s plan of care, which four findings would indicate that it would be safe to administer the antibiotic vancomycin?