| PSA | parasternal short axis; pleomorphic salivary gland adenoma; polyethylene sulfonic acid; polysacchari... |
|---|---|
| qhs | every hour of sleep [Lat. quaque hora somni] |
| QS | question screening; quiet sleep |
| REMS | rapid eye movement sleep |
| SA | salicylic acid; saline [solution]; salt added; sarcoidosis; sarcoma; scalenus anticus; secondary ame... |