Q. A 59-year-old Brazilian male is brought to the emergency department due to loss of consciousness. He was watching a professional soccer game on television at a crowded bar and collapsed. EMS was activated and he was found to be unconscious with a "thready", weak but still present pulse. The patient immigrated to the United States from a rural village in Brazil five months ago. His medical history is significant for achalasia. On evaluation, he is stuporous, pale, and diaphoretic. Vital signs show BP: 68/44 mmHg, HR: 114 bpm, respiratory rate: 25/min, oxygen saturation: 78%. Cardiac auscultation reveals a holosystolic murmur at the mitral area and an early diastolic additional heart sound. The attending physician decides to administer intravenous dobutamine. What will dobutamine do to the patient's cardiac function?