Q. A 68-year-old woman comes to the emergency department due to typical chest pain of one-hour duration. The patient's medical history is significant for insulin-controlled diabetes for 20 years. Her vital signs are BP:130/60 mmHg, HR: 90 bpm, respiratory rate: 17/min, and temperature: 36.8 degrees Celsius. The patient's ECG shows ST segment elevation in lead II, III, and aVF with reciprocal changes in V1 and V2. The ER physician decides to use a nitroglycerin patch to relieve the chest pain. Shortly after applying the patch, the patient develops dizziness, and her vital signs show BP: 70/53 mmHg, HR: 120 bpm, respiratory rate: 17/min, and temperature: 36.5 degrees Celsius. Which of the following is a direct effect of nitroglycerin?