| OA/BVM | oral airway/bag-valve-mask |
|---|---|
| OAD | obstructive airway disease; organic anionic dye |
| PAO | peak acid output; peripheral airway obstruction; plasma amine oxidase; polyamine oxidase; pulmonary ... |
| PAo | airway opening pressure; ascending aortic pressure; pulmonary artery occlusion pressure |
| PAS | para aminosalicylate; Parent Attitude Scale; patient administration system; patient appointments and... |