Problem: A 40-year-old woman presents for a routine examination. She denies chest pain, dyspnea, nausea, vomiting, palpitations, or other symptoms. Her vital signs are heart rate 70 bpm, respiratory rate 15 breaths/min, blood pressure 120/75 mm Hg, and temperature 37.0 °C (98.6 °F). On physical examination, the patient is in no acute distress. A cardiovascular examination reveals no murmurs. Lungs are clear to auscultation without wheezing, rales, or crepitus. Laboratory values show creatinine 0.8 mg/dL and blood urea nitrogen 14 mg/dL. Her electrocardiogram (ECG) has a PR interval of 0.25 seconds without any other abnormalities noted. Which of the following is the best next step in the treatment of this patient? Need Assignment Help? A. Reassurance and follow-up with serial ECG B. Admitting the patient and preparing the patient for pacemaker placement C. Holter monitoring D. Implantable loop recorder