68 yo female immediately post op for lap small bowel resection . 5'2, 80 kgs. 3 hour case, extubated deeply with stable VS, emerging uneventfully in the PACU, lying supine. As she resumes consciousness, she becomes agitated and hypoxic. Placed in high Fowlers, sub q air is appreciated from abdomen to mandible bilaterally, more or less. Lung sounds diminished bilat, to bases, tho difficult to assess given the circumstances. Things looking quite poor. It's quite a cluster F at the bedside.

Differential?