| CSN | cardiac sympathetic nerve; carotid sinus nerve |
|---|---|
| RSD | reflex sympathetic dystrophy; relative standard deviation |
| RSDS | reflex sympathetic dystrophy syndrome |
| SA | salicylic acid; saline [solution]; salt added; sarcoidosis; sarcoma; scalenus anticus; secondary ame... |
| SOH | sympathetic orthostatic hypotension |