| PAo | airway opening pressure; ascending aortic pressure; pulmonary artery occlusion pressure |
|---|---|
| PAR | participating provider; passive avoidance reaction; perennial allergic rhinitis; photosynthetically ... |
| SAD | Scale of Anxiety and Depression; seasonal affective disorder; Self-Assessment Depression [scale]; se... |
| SAO | small airway obstruction; splanchnic artery occlusion; subvalvular aortic obstruction |
| SAS | sarcoma amplified sequence; self-rating anxiety scale; short arm splint; Sklar Aphasia Scale; sleep ... |