question: Q:A 21-year-old college student comes to the physician for intermittent palpitations. She does not have chest pain or shortness of breath. The symptoms started 2 days ago, on the night after she came back to her dormitory after a 4-hour-long bus trip from home. A day ago, she went to a party with friends. The palpitations have gotten worse since then and occur more frequently. The patient has smoked 5 cigarettes daily for the past 3 years. She drinks 4–6 alcoholic beverages with friends once or twice a week and occasionally uses marijuana. She is sexually active with her boyfriend and takes oral contraceptive pills. She does not appear distressed. Her pulse is 100/min and irregular, blood pressure is 140/85 mm Hg, and respirations are at 25/min. Physical examination shows a fine tremor in both hands, warm extremities, and swollen lower legs. The lungs are clear to auscultation. An ECG is shown below. Which of the following is the most appropriate next step in management?? 
  {'A': 'Measure TSH levels', 'B': 'Observe and wait', 'C': 'Administer intravenous adenosine', 'D': 'Measure D-Dimer levels', 'E': 'Send urine toxicology'},