A 22-year-old male presents to the emergency department afte…

A 22-year-old male presents to the emergency department after a motorcycle accident with a mid-shaft tibial fracture. Several hours after immobilization, he reports severe, worsening pain in his lower leg that seems out of proportion to the injury. On examination, the leg appears swollen and tense. He reports numbness in the toes and has difficulty moving his foot. Which pathophysiologic process most accurately explains the patient’s symptoms? 

A 70-year-old patient has just undergone upper abdominal sur…

A 70-year-old patient has just undergone upper abdominal surgery and reports shallow breathing due to pain. On auscultation, decreased breath sounds are noted at the lung bases. The nurse explains that mild atelectasis can occur postoperatively. Which of the following interventions is most effective in preventing or reversing mild atelectasis?