Your 76-year-old female patient is having trouble breathing. When you auscultate her lungs, you hear crackles (rales) and you are concerned that she may have pulmonary edema. Her oxygen saturation is 92%, so you place her on 100% oxygen via a nonrebreather mask. Her breathing gets a little easier with the oxygen. You decide to expedite transport since she is anxious about her condition. Later, as

you are completing your reassessment, you see that her respirations have slowed to 8 times per minute and she is barely staying awake. What should you do next?

A) Shake her to keep her awake.
B) Assist her with using her metered-dose inhaler.
C) Begin ventilating her with a bag-valve mask.
D) Ask your partner to pull over and wait for ALS backup.

C