A 52 year-old post-operative patient's chest radiograph demonstrates infiltrates in the posterior basal segments of the lower lobes. Which of the following is the appropriate postural drainage position?

A. Head down, patient supine with a pillow under knees
B. Patient prone with a pillow under head, bed flat
C. Patient supine with a pillow under knees, bed flat
D. Head down, patient prone with a pillow under hips

Answer: D. Head down, patient prone with a pillow under hips