Q. A 26-year-old male comes to the emergency department because of chest palpitations. The patient's medical history is significant for lens dislocation. Vital signs show a blood pressure of 120/50 mm Hg, heart rate 73/min, and a respiratory rate of 16/min. Upon examination, the patient is tall and thin with long fingers, and has an inwardly depressed sternum. Which of the following is expected on cardiac auscultation of this patient?