The Respiratory Therapist Has Just Stopped Postural Drainage for a 24-Year-Old

The respiratory therapist has just stopped postural drainage for a 24-year-old patient with cystic fibrosis because of shortness of breath and slight cyanosis in the "head-down" position.The respiratory therapist should recommend which of the following adjustments to therapy?

A) Continue postural drainage and monitor patient with capnography.
B) Use only upright or flat postural drainage positions and draw an arterial blood gas (ABG) .
C) Administer oxygen via nasal cannula and monitor with pulse oximetry.
D) Use a transcutaneous partial pressure of oxygen (PO₂) monitor to assess the extent of hypoxemia.