“…1 IS is ordered for patients at risk for postoperative pulmonary complications to reduce that risk. [2][3][4] According to the American Association for Respiratory Care (AARC), 5 IS is indicated for patients with atelectasis and for those with the following risk factors for atelectasis: thoracic or abdominal surgery, 2 coronary artery bypass graft surgery, 67 patients wearing binders on the thorax or abdomen, prolonged bed rest, COPD, poor pain control, 8 neuromuscular lung disease, inspiratory capacity Ͻ 2.5 L, 9 spinal cord injuries, and sickle cell patients with acute chest syndrome. 8,10 There are no IS guidelines from the American Thoracic Society.…”