Q. Michelle is a 54-year-old woman hospitalized for a pelvic fracture three days ago and underwent open pelvic surgical fixation with an anterior abdominopelvic approach in a supine position two days ago. After the surgery, she was admitted to ICU for observation. She was confined to bed rest during her 48-hour ICU admission. Today she is moved to the general orthopedic ward to be ambulated. When you visit her, she complains of some sputum production and difficulty breathing. She has no chest pain. The pulse oximeter shows an oxygen saturation of 94% with room air. Her body mass index is 31.1 kg/m2. The temperature is 37.6 degrees Celsius (99.68 degrees Fahrenheit), the pulse rate is 82/min, the respiratory rate is 18/min, and the blood pressure is 124/73 mmHg. The surgical wound is clean and normal. The abdomen is soft and non-tender. In the bases of both lungs, coarse rhonchi are heard. Lower limbs have no edema with intermittent pneumatic compression devices. Currently, she receives enoxaparin 40 mg SC every 12 hours, paracetamol 1000 mg every 8 hours, and multivitamins. The chest x-ray, taken while lying, shows some opacities in the base of the right lung. What is the best plan for her?